阅读说明：本技术 一种发动机曲轴回转力矩测试装置及测试方法 (Engine crankshaft gyration torque testing device and testing method ) 是由 孙辉 陈朗 吕乐 李林 于 2021-08-02 设计创作，主要内容包括：本发明提供一种发动机曲轴回转力矩测试装置及测试方法,其中测试装置包括机架、力矩检测装置和控制系统,力矩检测装置沿与发动机对接方向可滑动设置在所述机架上；力矩检测装置包括沿与发动机对接方向依次传动连接的驱动电机、扭矩检测装置、转速检测装置、传动轴和曲轴对接机构,曲轴对接机构可伸缩设置在传动轴对接端,用于与发动机曲轴对接传递扭矩；驱动电机、扭矩检测装置和转速检测装置均与控制系统电性连接；测试方法,将本发明的测试装置与发动机对接完成,启动力矩检测装置便可检测发动机运行力矩信息和转速信息,通过力矩信息判断发动机是否存在异常情况,如存在异常,以及维修,避免在后续工位返工,从而降低产品的维修成本。(The invention provides a device and a method for testing the revolving torque of an engine crankshaft, wherein the testing device comprises a rack, a torque detection device and a control system, wherein the torque detection device is arranged on the rack in a sliding manner along the butt joint direction with the engine; the torque detection device comprises a driving motor, a torque detection device, a rotating speed detection device, a transmission shaft and a crankshaft butting mechanism which are sequentially connected in a transmission manner along the butting direction of the engine, and the crankshaft butting mechanism is telescopically arranged at the butting end of the transmission shaft and is used for butting with the crankshaft of the engine to transmit torque; the driving motor, the torque detection device and the rotating speed detection device are electrically connected with the control system; the testing method is characterized in that the testing device is butted with an engine, the torque detection device can be started to detect the running torque information and the rotating speed information of the engine, whether the engine has abnormal conditions, such as abnormality and maintenance, is judged through the torque information, and rework of subsequent stations is avoided, so that the maintenance cost of products is reduced.)

1. The engine crankshaft gyroscopic moment testing device is characterized by comprising a rack, a moment detection device and a control system, wherein the moment detection device is arranged on the rack in a slidable manner along the butt joint direction with an engine; the torque detection device comprises a driving motor, a torque detection device, a rotating speed detection device, a transmission shaft and a crankshaft butting mechanism which are sequentially connected in a transmission manner along the butting direction of the engine, and the crankshaft butting mechanism is telescopically arranged at the butting end of the transmission shaft and is used for butting with the crankshaft of the engine to transmit torque; the driving motor, the torque detection device and the rotating speed detection device are electrically connected with the control system.

2. The device for testing the engine crankshaft gyroscopic torque according to claim 1, wherein the crankshaft docking mechanism comprises an index plate, a transition block, a driving head and an elastic member which are connected in sequence, the index plate is slidably sleeved on the docking end of the transmission shaft, and the transition block is arranged at the end of the docking end of the transmission shaft to prevent the index plate from falling off; the driving head is fixedly connected with the dividing plate through a plurality of sliding shafts; the elastic piece is arranged at the tail end of the transmission shaft, and one end of the elastic piece is in abutting contact with the end, far away from the driving head, of the dividing plate; the driving head is provided with three positioning pins and is used for being matched and positioned with an engine crankshaft to transmit torque.

3. The apparatus of claim 2, wherein one of the three locating pins is a diamond pin and the other two of the three locating pins are cylindrical pins.

4. The engine crankshaft gyroscopic torque testing device according to any one of claims 1 to 3, further comprising a position detecting device disposed on the telescopic path of the index plate for detecting the docking condition of the crankshaft docking mechanism.

5. The apparatus according to any one of claims 1 to 3, wherein the torque detection device is slidably connected to the frame by a horizontal moving device, the horizontal moving device comprises a sliding seat, a guiding device disposed at the bottom of the sliding seat, and a driving device for driving the sliding seat to move horizontally, and the torque detection device is disposed on the sliding seat.

6. A method for testing the revolving torque of an engine crankshaft is characterized by comprising the following steps:

s1: installing the engine with the crankshaft on a tray adapter, and adjusting the position of the tray adapter of the engine to enable the axis of the crankshaft of the engine to be collinear with the axis of the torque detection device;

s2: the horizontal moving device drives the torque detection device to gradually approach the crankshaft end of the engine to be butted along the butting direction until a positioning pin arranged on the driving head is contacted with the end face of the crankshaft end, and preliminary butting is completed;

s3: starting a driving motor of the torque detection device, driving a driving head to rotate by the driving motor, simultaneously gradually propelling the horizontal moving device, and gradually connecting a crankshaft butting mechanism with a crankshaft of the engine to finish final butting;

s4: the driving motor drives the engine to rotate at a low speed, meanwhile, the torque detection device and the rotating speed detection device acquire a current torque value and a current rotating speed value in real time and transmit the current torque value and the current rotating speed value to the control system, the control system draws a torque curve of the engine running according to the received torque value and the received rotating speed value and judges whether the current torque curve is normal or not, if the torque curve is normal, the current engine is judged to be normal, the next station is started to be installed or tested, and if the torque curve is normal and abnormal, the current engine is judged to be started to be repaired;

s5: stopping rotating after the engine rotates to a preset number of turns; the horizontal moving device drives the torque detection device to gradually get away from the crankshaft end of the engine along the direction departing from the butt joint until the positioning pin of the driving head is separated from the crankshaft end.

7. The method as claimed in claim 6, wherein in step S2, the engine cranking torque testing device is provided with a position detecting device, when the position detecting device detects that the horizontal moving device moves to a set position, the position detecting device feeds back position information to the control system, and the control system controls the horizontal moving device to stop.

8. The method for testing engine crankshaft gyroscopic torque according to claim 6 or 7, wherein in the step S3, during the final butt joint process, the positioning pin abuts against the end face of the crankshaft end, and the slide rod pushes the index plate to compress the elastic member until the positioning pin rotates to the positioning hole arranged at the end face of the engine crankshaft, and the elastic member releases the elastic force to press the positioning pin into the positioning hole to realize circumferential positioning so as to transmit torque.

9. The method as claimed in claim 6 or 7, wherein in step S4, the maximum starting torque of the engine is obtained by the torque curve, and when the maximum starting torque of the engine exceeds 1.4-2.6 Nm, it is determined that there is a fault and maintenance is required; and/or the average torque of the engine can be obtained through a torque curve, and when the maximum starting torque of the engine exceeds the range of 1-2.2 Nm, the engine is judged to have a fault and needs to be maintained.

10. The method for testing engine cranking torque according to claim 9, wherein in the step S4, the rotation speed of the driving motor in the low-speed rotation of the driving engine is between 0rpm and 150 rpm; in the step S5, the preset number of turns is equal to or less than 5.

Technical Field

The invention relates to the technical field of engine testing, in particular to a device and a method for testing the revolving moment of an engine crankshaft.

Background

The crankshaft and camshaft are important high-speed rotating transmission components of the engine and are indispensable components of an engine timing system. If the two parts are abnormal after being installed, the engine can run abnormally, the performance of the engine does not reach the standard, the engine is difficult to start, or a bearing bush is damaged; in general, the following are the potential risks and factors affecting engine performance during installation:

1. the grades of the upper bush and the lower bush of the crankshaft are used wrongly, and the grades of the bearing bushes in different positions can cause the friction force borne by the crankshaft during operation to be different;

2. impurities are generated between the upper and lower bearing bushes of the crankshaft, so that the rotating friction force of the crankshaft is increased, and the crankshaft and the upper and lower bearing bushes of the crankshaft are damaged;

3. the grades of the upper and lower bearing bushes of the crank connecting rod are used wrongly, and the grades of the bearing bushes of the crank connecting rod mechanisms at different positions are used wrongly to cause the friction force borne by the crank connecting rod during the operation to be different;

4. impurities appear between the upper and lower bearing bushes of the crank connecting rod and the crank shaft, which causes the increase of the rotating friction force of the crank connecting rod in operation and damages the crank shaft and the upper and lower bearing bushes of the crank shaft

5. The piston and the piston ring are not matched, for example, the piston ring is deformed and damaged or is too large, when the piston reciprocates in an engine, the piston ring generates friction with the inner wall of a cylinder body, and the resistance is too large;

6. the crankshaft journal or the bearing bush and the connecting rod bush are scratched, and the contact surface is not smooth, so that the resistance is abnormal.

Conventionally, the potential risks are detected by the following methods:

1. taking a picture by a camera: the grade of the bearing bush is distinguished through color, and the bearing bush is prevented from being wrongly mounted and flowing into a subsequent station; whether foreign matters exist on the bearing bush or not cannot be detected;

2. and (4) leakage test of the whole machine: the whole machine leakage test mainly aims at whether the water channel, the oil channel, the air channel and the cylinder cover of the engine have defects to cause air leakage or not; whether the piston ring is abnormal or not is checked, but the accuracy rate is not high; and bearing bush foreign matter cannot be detected.

3. And (3) cold test: the cold test is a one-time comprehensive mechanical property check before the engine is off line, wherein two torque checks are performed: starting torque: the engine is dragged to rotate by the servo motor from a static state, is called starting torque detection from the static state to the beginning of uniform rotation, and comprehensively detects the torque required by the operation of transmission parts such as a piston, a piston ring, a crank-link mechanism, a crankshaft, a camshaft, a timing chain wheel and the like, a lubricating system and the like; and detecting the uniform speed torque. The two types of detection are used for comprehensively detecting the torque required by the starting and the running of the engine, detecting abnormal torque and requiring the engine to be sent for repair; the manual work time that the repair needs is long, and is inefficient, and part cost of maintenance is high.

4. Hot test: the hot test is a comprehensive engine performance test device; the engine actively works, and the data of the running state of the engine is read to carry out analysis and judgment, such as torque, air inflow, vibration, engine oil pressure, exhaust temperature and the like. However, the method has high equipment cost and low cost performance, and belongs to the later period when problems are found, the engine has damaged parts, the repair difficulty is high, and the cost is high.

Some of the detection methods can only detect a part of problems, and some detection methods have low accuracy; further, the equipment is expensive, and although abnormality can be detected, the cost for maintaining the engine after abnormality detection is high, and the efficiency is low. Research shows that the potential risks are finally reflected on the revolution torque of the engine, so that an engine crankshaft revolution torque testing device is urgently needed to be designed, various potential risks of the engine can be comprehensively detected, and the investment cost is low.

Disclosure of Invention

In order to solve the problems, the invention provides the device and the method for testing the engine crankshaft gyration torque, which can comprehensively detect various potential risks of an engine and improve the detection efficiency, and have the advantages of simple equipment structure and low investment cost.

In order to achieve the aim, the invention provides an engine crankshaft gyroscopic moment testing device which comprises a rack, a moment detecting device and a control system, wherein the moment detecting device is arranged on the rack in a slidable manner along the butt joint direction of an engine; the torque detection device comprises a driving motor, a torque detection device, a rotating speed detection device, a transmission shaft and a crankshaft butting mechanism which are sequentially connected in a transmission manner along the butting direction of the engine, and the crankshaft butting mechanism is telescopically arranged at the butting end of the transmission shaft and is used for butting with the crankshaft of the engine to transmit torque; the driving motor, the torque detection device and the rotating speed detection device are electrically connected with the control system.

As a further improvement of the above scheme, the crankshaft butting mechanism comprises an index plate, a transition block, a driving head and an elastic member which are sequentially connected, the index plate is slidably sleeved on the transmission shaft butting end, and the transition block is arranged at the end of the transmission shaft butting end to prevent the index plate from falling off; the driving head is fixedly connected with the dividing plate through a plurality of sliding shafts; the elastic piece is arranged at the tail end of the transmission shaft, and one end of the elastic piece is in abutting contact with the end, far away from the driving head, of the dividing plate; the driving head is provided with three positioning pins and is used for being matched and positioned with an engine crankshaft to transmit torque.

As a further improvement of the scheme, a plurality of through holes are formed in the transition block for the sliding shaft to pass through.

As a further improvement of the scheme, one of the three positioning pins is a diamond pin, and the other two positioning pins are cylindrical pins.

As a further improvement of the above solution, the elastic member includes, but is not limited to, a spring.

As a further improvement of the above, the torque detection device includes, but is not limited to, a torque sensor for detecting the load torque.

As a further improvement of the above solution, the rotation speed detection device includes, but is not limited to, an encoder for detecting the rotation speed of the load.

As a further improvement of the above scheme, the engine crankshaft gyroscopic moment testing device further comprises a position detecting device, and the position detecting device is arranged on the telescopic path of the dividing plate and used for detecting the butt joint condition of the crankshaft butt joint mechanism.

As a further improvement of the above solution, the position detection device includes, but is not limited to, a proximity switch.

As a further improvement of the above solution, the torque detection device is slidably connected to the frame through a horizontal movement device, and the horizontal movement device includes a sliding seat, a guide device disposed at the bottom of the sliding seat, and a driving device for driving the sliding seat to move horizontally.

As a further improvement of the above scheme, the torque detection device is arranged on the sliding seat, and the torque detection device can horizontally move along the direction of butting with the engine under the driving of the driving device.

As a further improvement of the above scheme, the guiding device includes but is not limited to a linear guide rail assembly, the linear guide rail assembly includes a linear guide rail and a slider, the linear guide rail is disposed on the frame, the slider is disposed at the bottom of the sliding seat, and is slidably sleeved on the linear guide rail.

As a further improvement of the above scheme, the driving device comprises but is not limited to a linear driving air cylinder, an electric cylinder or an oil cylinder.

As a further improvement of the scheme, the torque sensor is connected with the driving motor and the transmission shaft through a coupler.

As a further improvement of the above solution, the torque detection device further includes a support seat for supporting the transmission shaft.

As a further improvement of the above scheme, the supporting seat includes but is not limited to a bearing with a seat.

The invention also provides a gyroscopic moment testing method of the engine crankshaft gyroscopic moment testing device, which comprises the following steps:

s1: installing the engine with the crankshaft on a tray adapter, and adjusting the position of the tray adapter of the engine to enable the axis of the crankshaft of the engine to be collinear with the axis of the torque detection device;

s2: the horizontal moving device drives the torque detection device to gradually approach the crankshaft end of the engine to be butted along the butting direction until a positioning pin arranged on the driving head is contacted with the end face of the crankshaft end, and preliminary butting is completed;

s3: starting a driving motor of the torque detection device, driving a driving head to rotate by the driving motor, simultaneously gradually propelling the horizontal moving device, and gradually connecting a crankshaft butting mechanism with a crankshaft of the engine to finish final butting;

s4: the driving motor drives the engine to rotate at a low speed, meanwhile, the torque detection device and the rotating speed detection device acquire a current torque value and a current rotating speed value in real time and transmit the current torque value and the current rotating speed value to the control system, the control system draws a torque curve of the engine running according to the received torque value and the received rotating speed value and judges whether the current torque curve is normal or not, if the torque curve is normal, the current engine is judged to be normal, the next station is started to be installed or tested, and if the torque curve is normal and abnormal, the current engine is judged to be started to be repaired;

s5: stopping rotating after the engine rotates to a preset number of turns; the horizontal moving device drives the torque detection device to gradually get away from the crankshaft end of the engine along the direction departing from the butt joint until the positioning pin of the driving head is separated from the crankshaft end.

As a further improvement of the above solution, in step S2, the engine crankshaft gyroscopic moment testing device is provided with a position detecting device, and when the position detecting device detects that the horizontal moving device moves to a set position, the position detecting device feeds back position information to a control system, and the control system controls the horizontal moving device to stop.

As a further improvement of the above solution, in step S3, in the final butt joint process, the locating pin abuts against the end face of the crankshaft end, and pushes the index plate to compress the elastic member through the slide rod until the locating pin rotates to the locating hole disposed at the end face of the crankshaft of the engine, and the elastic member releases the elastic force to press the locating pin into the locating hole to achieve circumferential location so as to transmit torque.

As a further improvement of the above scheme, in step S4, the maximum starting torque of the engine can be obtained through the torque curve, and when the maximum starting torque of the engine exceeds the range of 1.4 to 2.6Nm, it is determined that there is a fault and maintenance is required; and/or the average torque of the engine can be obtained through a torque curve, and when the maximum starting torque of the engine exceeds the range of 1-2.2 Nm, the engine is judged to have a fault and needs to be maintained.

As a further improvement of the above scheme, in the step S4, the rotation speed of the driving motor in the low-speed rotation of the driving motor is between 0rpm and 150 rpm.

As a further improvement of the above solution, in the step S5, the preset number of turns is less than or equal to 5.

It should be noted that, when the engine crankshaft gyroscopic moment testing device is used to perform gyroscopic moment testing on an engine, the engine to be tested needs to be placed on the corresponding engine tray adapter, and the position of the engine tray adapter is adjusted, so that the axis of the engine crankshaft is collinear with the axis of the engine crankshaft gyroscopic moment testing device.

Due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the engine crankshaft gyration torque testing device comprises a rack, a torque detection device and a control system, wherein the torque detection device is arranged on the rack in a slidable manner along the butt joint direction with an engine; the torque detection device comprises a driving motor, a torque detection device, a rotating speed detection device, a transmission shaft and a crankshaft butting mechanism which are sequentially connected in a transmission manner along the butting direction of the engine, and the crankshaft butting mechanism is telescopically arranged at the butting end of the transmission shaft and is used for butting with the crankshaft of the engine to transmit torque; the driving motor, the torque detection device and the rotating speed detection device are electrically connected with the control system. According to the arrangement, only the engine provided with the crankshaft is placed at the corresponding test position of the engine crankshaft revolving torque testing device, the butt joint with the engine to be tested is gradually completed, the torque testing device is started, the running torque information of the crankshaft or the camshaft and related parts can be detected, the actual running torque information is compared with the torque information under the standard condition, and if the actual running torque information exceeds the torque information under the standard condition, the abnormal condition of the crankshaft or the camshaft and related parts in the assembling process is judged, so that the engine crankshaft revolving torque testing device can find the abnormal condition existing in the early assembling process of the engine, the abnormal condition can be timely processed, the reworking of subsequent stations is avoided, and the maintenance cost of the product is reduced; specifically, the test can be carried out after the installation of the crankshaft and the accessories thereof is finished, the whole engine does not need to be assembled, therefore, the test can be carried out after the installation of the crankshaft is finished, and the crankshaft can be immediately disassembled if abnormal conditions occur, so the maintenance efficiency is high.

2. According to the engine crankshaft revolution torque testing device, the torque testing device is connected to the rack in a sliding mode through the horizontal moving device, and the horizontal moving device comprises the sliding seat, the guiding device arranged at the bottom of the sliding seat and the driving device for driving the sliding seat to move horizontally; the torque detection device comprises a driving motor, a torque detection device, a rotating speed detection device, a transmission shaft and a crankshaft butting mechanism which are sequentially connected in a transmission manner along the butting direction of the engine, and the crankshaft butting mechanism is telescopically arranged at the butting end of the transmission shaft and is used for butting with the crankshaft of the engine to transmit torque; the horizontal moving device drives the torque detection device to move along the butt joint direction to realize automatic butt joint, and the structure is simple and compact; in addition, the crankshaft butt joint mechanism is used for realizing butt joint with the crankshaft, and the butt joint mechanism is high in butt joint precision, safe and reliable.

3. The invention relates to a method for testing the revolving moment of an engine crankshaft, which comprises the steps of firstly installing an engine with a crankshaft on a tray adapter, and adjusting the position of the tray adapter of the engine to enable the axis of the crankshaft of the engine to be collinear with the axis of a moment detection device; then, the horizontal moving device is used for carrying out initial butt joint with the torque detection device, the driving motor of the torque detection device and the horizontal moving device are still pushed gradually, and the crankshaft butt joint mechanism is connected with the crankshaft of the engine step by step to complete final butt joint; then the motor is driven to drive the engine to rotate at a low speed, meanwhile, the torque detection device and the rotating speed detection device acquire a current torque value and a current rotating speed value in real time and transmit the current torque value and the current rotating speed value to the control system, the control system draws a torque curve of the engine according to the received torque value and the received rotating speed value and judges the torque abnormal condition of the current engine according to the torque curve, the whole gyration torque test realizes automatic test, manual intervention is not needed, and trouble and labor are saved; and the test is carried out at a low rotating speed in the crankshaft revolution torque test, the test result can be obtained only by rotating for 5 circles generally, the test is convenient and fast, meanwhile, engine parts are hardly damaged, and the maintenance cost is low.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;

FIG. 1 is a schematic perspective view of an apparatus for testing engine crankshaft gyroscopic torque disclosed in the present invention;

FIG. 2 is a schematic top view of an engine crankshaft gyroscopic moment testing device disclosed in the present invention

FIG. 3 is a schematic front view of an engine crankshaft gyroscopic moment testing device disclosed in the present invention;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

reference numerals:

1. a frame; 2. a torque detection device; 21. a drive motor; 22. a torque detection device; 23. a rotational speed detection device; 24. a drive shaft; 25. a coupling; 26. a crankshaft docking mechanism; 261. an index plate; 262. a transition block; 263. a drive head; 264. an elastic member; 265. a slide shaft; 266. positioning pins; 27. a position detection device; 28. a supporting seat; 3. a horizontal moving device; 31. a sliding seat; 32. a guide device; 33. a drive device.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators such as the first, second, upper, lower, left, right, front and rear … … in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture as shown in the drawings, and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The invention will be further described with reference to the following figures:

example 1:

referring to fig. 1-4, the invention provides an engine crankshaft gyroscopic moment testing device, which comprises a frame 1, a moment detecting device 2 and a control system, wherein the moment detecting device 2 is slidably arranged on the frame 1 along a direction of abutting with an engine, the moment detecting device 2 is slidably connected to the frame 1 through a horizontal moving device 3, the horizontal moving device 3 comprises a sliding seat 31, a guiding device 32 arranged at the bottom of the sliding seat 31, and a driving device 33 driving the sliding seat 31 to horizontally move; the torque detection device 2 is arranged on the sliding seat 31, and the torque detection device 2 can horizontally move along the butt joint direction with the engine under the drive of a driving device 33;

the torque detection device 2 comprises a driving motor 21, a torque detection device 22, a rotating speed detection device 23, a transmission shaft 24 and a crankshaft butting mechanism 26 which are sequentially connected in a transmission manner along the butting direction of the engine, wherein the crankshaft butting mechanism 26 is telescopically arranged at the butting end of the transmission shaft 24 and is used for butting with the crankshaft of the engine to transmit torque; the driving motor 21, the torque detection device 22 and the rotating speed detection device 23 are all electrically connected with the control system. In this embodiment, the control system includes a central processing unit, a display and a memory, the torque detection device 22 and the rotation speed detection device 23 respectively feed back the acquired torque information and rotation speed information to the central processing unit, and the torque information and the rotation speed information are drawn into a rotation speed and torque curve after passing through the central processing unit and are displayed on the display, and meanwhile, the memory also stores the torque information under a standard condition. According to the arrangement, only the engine provided with the crankshaft is placed at the corresponding test position of the engine crankshaft revolving torque testing device, the butt joint with the engine to be tested is gradually completed, the torque testing device 2 is started, the running torque information of the crankshaft or the camshaft and related parts can be detected, the actual running torque information is compared with the torque information under the standard condition, and if the actual running torque information exceeds the torque information under the standard condition, the abnormal condition of the crankshaft or the camshaft and related parts in the assembling process is judged, so that the engine crankshaft revolving torque testing device can find the abnormality in the early assembling process of the engine, the abnormality can be timely processed, the reworking of subsequent stations is avoided, and the maintenance cost of the product is reduced; specifically, the test can be carried out after the installation of the crankshaft and the accessories thereof is finished, the whole engine does not need to be assembled, therefore, the test can be carried out after the installation of the crankshaft is finished, and the crankshaft can be immediately disassembled if abnormal conditions occur, so the maintenance efficiency is high.

In addition, the horizontal moving device 3 drives the torque detection device 2 to move along the butt joint direction to realize automatic butt joint, and the structure is simple and compact; in addition, the crankshaft butting mechanism 26 realizes butting with the crankshaft, and is high in butting precision, safe and reliable.

It should be noted that, when the engine crankshaft gyroscopic moment testing device is used to perform a gyroscopic moment test on an engine, the engine to be tested needs to be placed on the corresponding engine tray adapter, and the position of the engine tray adapter is adjusted, so that the axis of the engine crankshaft is collinear with the axis of the transmission shaft 24 of the moment testing device 2.

As a preferred embodiment, the crankshaft docking mechanism 26 includes an indexing disc 261, a transition block 262, a driving head 263 and an elastic member 264 which are connected in sequence, the indexing disc 261 is slidably sleeved on the docking end of the transmission shaft 24, and the transition block 262 is disposed at the end of the docking end of the transmission shaft 24 to prevent the indexing disc 261 from falling off; the driving head 263 is fixedly connected with the dividing disc 261 through a plurality of sliding shafts 265; the elastic piece 264 is arranged at the tail end of the transmission shaft 24, and one end of the elastic piece is in abutting contact with the end, far away from the driving head 263, of the dividing disc 261; the driving head 263 is provided with three positioning pins 266 for matching and positioning with an engine crankshaft to transmit torque; specifically, in this embodiment, the elastic element 264 is a pressure spring, the pressure spring is sleeved at the abutting end of the transmission shaft 24, one end of the pressure spring abuts against a shaft shoulder of the transmission shaft 24, and the other end of the pressure spring abuts against the end of the indexing disc 261 far away from the driving head 263; the driving head 263 is fixedly connected with one end part of the sliding shaft 265 through a screw, the dividing disc 261 is fixedly connected with the other end part of the sliding shaft 265 through a screw, the middle part of the sliding shaft 265 penetrates through the transition block 262 and is in clearance fit with the transition block 262, so that the dividing disc 261 is pushed by the sliding shaft 265 when the driving head 263 is in contact with the end surface of the crankshaft, the dividing disc 261 compresses the elastic piece 264, and the driving head 263 has certain pre-pressure which is set so that the positioning pin 266 arranged on the driving head 263 can be accurately matched with a corresponding positioning hole on the crankshaft;

in some embodiments, the sliding shaft 265 is directly connected to the indexing disk 261, and the pre-stressing of the driving block can be achieved without passing through the transition block 262.

In a preferred embodiment, the transition block 262 is provided with a plurality of through holes for the sliding shaft 265 to pass through, the sliding shaft 265 is in clearance fit with the through holes, and the clearance fit is set, so that the sliding shaft 265 can directly transmit the reaction force of the driving head 263 against the end face of the crankshaft to the dividing disc 261 through the sliding shaft 265.

In a preferred embodiment, three of the positioning pins 266, one of which is a diamond pin and the other two of which are cylindrical pins, are provided so that the driving head 263 can be precisely positioned and fitted to the end face of the crankshaft to effectively transmit torque.

In a preferred embodiment, the torque detection device 22 includes, but is not limited to, a torque sensor for detecting the load torque. In this embodiment, the base of the torque sensor is fixed on the sliding seat 31, and both ends of the torque sensor are respectively connected with the driving motor 21 and the transmission shaft 24 through the coupling 25.

As a preferred embodiment, the rotation speed detecting device 23 includes, but is not limited to, an encoder for detecting the rotation speed of the load, and in this embodiment, an encoder bracket is further provided, and the encoder bracket is fixed on the sliding seat 31 and is used for fixedly supporting the encoder.

As a preferred embodiment, the engine crankshaft slewing torque testing device further comprises a position detecting device 27, wherein the position detecting device 27 is arranged on the telescopic path of the dividing disc 261 and is used for detecting the butt joint condition of the crankshaft butt joint mechanism 26; in this embodiment, the position detection device 27 includes, but is not limited to, a proximity switch, and specifically, a protruding edge is provided on the indexing disc 261, and the proximity switch detects the detection protruding edge, and when the driving head 263 compresses the elastic member 264 through the sliding shaft 265 and the indexing disc 261, the protruding edge is separated from the detection area of the proximity switch, and it is determined that the driving head 263 has contacted the end surface of the crankshaft, and the elastic member 264 releases the elastic force until the positioning pin 266 on the driving head 263 is pressed into the corresponding positioning hole of the crankshaft under the pre-pressure of the elastic member 264, and the proximity switch can detect the protruding edge.

In a preferred embodiment, the guiding device 32 includes, but is not limited to, a linear guide assembly, and the linear guide assembly includes a linear guide and a sliding block, the linear guide is disposed on the frame 1, the sliding block is disposed at the bottom of the sliding seat, and is slidably sleeved on the linear guide. In the present embodiment, two sets of linear guide rail assemblies are provided, and the two sets of linear guide rail assemblies are arranged on the sliding seat 31 in parallel.

In the embodiment, the driving device 33 is a linear driving cylinder, and a buffer is further provided at a power output end of the linear driving cylinder, for reducing an impact force of the linear driving cylinder during the extension process, so as to avoid damage to an end surface of the crankshaft.

As a preferred embodiment, the torque detection device 2 further includes a supporting seat 28 for supporting the transmission shaft 24, and the supporting seat 28 is disposed at an end close to the driving head 263, and the supporting seat 28 is disposed so that the transmission shaft 24 is stably supported, thereby ensuring that the driving head 263 and the crankshaft can be accurately butted.

In a preferred embodiment, the support base 28 includes, but is not limited to, a mounted bearing.

Example 2:

the invention also provides a gyroscopic moment testing method of the engine crankshaft gyroscopic moment testing device, which comprises the following steps:

s1: installing the engine with the crankshaft on the tray adapter, and adjusting the position of the engine tray adapter to enable the axis of the crankshaft of the engine to be collinear with the axis of the torque detection device 2;

s2: the horizontal moving device 3 drives the torque detection device 2 to gradually approach the crankshaft end of the engine to be butted along the butting direction until a positioning pin 266 arranged on the driving head 263 is contacted with the end face of the crankshaft end, and preliminary butting is completed;

s3: starting a driving motor 21 of the torque detection device 2, driving the driving head 263 to rotate by the driving motor 21, and simultaneously, the horizontal moving device 3 is still gradually pushed, and the crankshaft docking mechanism 26 is gradually connected with the crankshaft of the engine to complete final docking;

s4: the driving motor 21 drives the engine to rotate at a low speed, meanwhile, the torque detection device 22 and the rotating speed detection device 23 acquire a current torque value and a current rotating speed value in real time and transmit the current torque value and the current rotating speed value to the control system, the control system draws a torque curve of the engine running according to the received torque value and the received rotating speed value and judges whether the current torque curve is normal or not, if the torque curve is normal, the current engine is judged to be normal, the engine enters the next station for installation or test, and if the torque curve is normal and abnormal, the current engine is judged to enter the repair station for maintenance;

s5: stopping rotating after the engine rotates to a preset number of turns; the horizontal moving device 3 brings the torque detecting device 2 away from the crankshaft end of the engine in the direction away from the butt joint until the positioning pin 266 of the driving head 263 is completely disengaged from the crankshaft end.

The testing method of the invention is that the engine with the crankshaft is arranged on the tray adapter, and the position of the engine tray adapter is adjusted to make the axis of the crankshaft of the engine and the axis of the torque detecting device 2 in a collinear way; then, the horizontal moving device 3 is used for carrying out initial butt joint with the torque detection device 2, the driving motor 21 of the torque detection device 2 and the horizontal moving device 3 are still gradually pushed, and the crankshaft butt joint mechanism 26 is gradually connected with the crankshaft of the engine to complete final butt joint; then the driving motor 21 drives the engine to rotate at a low speed, meanwhile, the torque detection device 22 and the rotating speed detection device 23 acquire a current torque value and a current rotating speed value in real time and transmit the current torque value and the current rotating speed value to the control system, the control system draws a torque curve of the engine according to the received torque value and the received rotating speed value and judges the torque abnormal condition of the current engine according to the torque curve, the whole gyration torque test realizes automatic test, manual intervention is not needed, and trouble and labor are saved; and the test is carried out at a low rotating speed in the crankshaft revolution torque test, the test result can be obtained only by rotating for 5 circles generally, the test is convenient and fast, meanwhile, engine parts are hardly damaged, and the maintenance cost is low.

As a preferable embodiment, in the step S2, the engine cranking torque testing device is provided with a position detecting device 27, when the position detecting device 27 detects that the horizontal moving device 3 moves to a set position, the position detecting device 27 feeds back position information to a control system, and the control system controls the horizontal moving device 3 to stop.

As a preferred embodiment, in the step S3, during the final butt joint process, the positioning pin 266 contacts the end surface of the crankshaft end, and pushes the index plate 261 to compress the elastic member 264 through the sliding rod until the positioning pin 266 rotates to the positioning hole corresponding to the end surface of the engine crankshaft, and the elastic member 264 releases the elastic force to press the positioning pin 266 into the positioning hole to achieve circumferential positioning for transmitting torque.

As a preferred embodiment, in step S4, the maximum starting torque of the engine can be obtained through the torque curve, and when the maximum starting torque of the engine exceeds the range of 1.4-2.6 Nm, it is determined that there is a fault and maintenance is required; and/or the average torque of the engine can be obtained through a torque curve, and when the maximum starting torque of the engine exceeds the range of 1-2.2 Nm, the engine is judged to have a fault and needs to be maintained.

In step S4, the rotation speed of the driving motor 21 during the low speed rotation of the engine is 0-150 rpm, so that the test of the rotation torque of the engine can be completed at a low speed, the engine parts are hardly damaged, and the maintenance cost is low

As a preferred embodiment, in the step S5, the preset number of turns is less than or equal to 5, the testing efficiency is high, and the engine parts are hardly damaged.

The foregoing is a detailed description of the invention, and specific examples are used herein to explain the principles and implementations of the invention, the above description being merely intended to facilitate an understanding of the principles and core concepts of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.