阅读说明：本技术 一种发动机连续可变直径水泵皮带轮 (Engine continuous variable diameter water pump belt pulley ) 是由 向高 熊迪 张丽珠 查乃敏 施发义 于 2020-12-08 设计创作，主要内容包括：本发明公开了一种发动机连续可变直径水泵皮带轮,包括定轮、多辐条动轮和凸轮,凸轮套设于定轮内圈,多辐条动轮套设于定轮的外圈；多辐条动轮与凸轮连接,凸轮相对于定轮转动时,驱动多辐条动轮相对于定轮外扩或内缩。本发明能自动且连续调节水泵皮带轮直径,实现对速比的连续调节,通过连续可调节的速比将发动机的水温控制在目标水温附近,提高工作效率,节约发动机能量,降低油耗和排放。(The invention discloses a continuously variable-diameter water pump belt pulley of an engine, which comprises a fixed wheel, a multi-spoke driving wheel and a cam, wherein the cam is sleeved on an inner ring of the fixed wheel; the multi-spoke driving wheel is connected with the cam, and when the cam rotates relative to the fixed wheel, the multi-spoke driving wheel is driven to expand outwards or contract inwards relative to the fixed wheel. The invention can automatically and continuously adjust the diameter of the water pump belt pulley, realize the continuous adjustment of the speed ratio, control the water temperature of the engine near the target water temperature through the continuously adjustable speed ratio, improve the working efficiency, save the energy of the engine, and reduce the oil consumption and the emission.)

1. A belt pulley of a water pump with a continuously variable diameter of an engine is characterized by comprising a fixed wheel, a multi-spoke driving wheel and a cam, wherein the cam is sleeved on an inner ring of the fixed wheel; the multi-spoke driving wheel is connected with the cam, and when the cam rotates relative to the fixed wheel, the multi-spoke driving wheel is driven to expand outwards or contract inwards relative to the fixed wheel.

2. The engine continuously variable diameter water pump pulley as claimed in claim 1, wherein a rotational drive mechanism is connected to the cam.

3. The engine continuously variable diameter water pump pulley as claimed in claim 2, wherein the rotary drive mechanism is connected to the cam through a power input shaft.

4. The engine continuously variable diameter water pump pulley as claimed in claim 3, wherein the rotary drive mechanism is an electric motor.

5. The pulley for the water pump of the engine according to claim 1, wherein the multi-spoke driving wheel comprises a plurality of arc-shaped plates, the arc-shaped plates are circumferentially arranged along the fixed wheel, a plurality of radial guide grooves are circumferentially arranged on the fixed wheel, the radial guide grooves are arranged in one-to-one correspondence with the arc-shaped plates, guide rods are arranged in the radial guide grooves, one ends of the guide rods are connected with the corresponding arc-shaped plates, the other ends of the guide rods are in contact connection with the outer edge of the cam, and an elastic locking device is arranged on the multi-spoke driving wheel and enables the guide rods to be in contact connection with the outer edge of the cam; when the cam rotates relative to the fixed wheel, the guide rod moves back and forth along the radial guide groove to drive the arc-shaped plate to move back and forth along the radial direction, so that the diameter of the multi-spoke driving wheel is adjusted.

6. The pulley for the water pump of the engine according to claim 5, wherein the number of the arc-shaped plates is 3-5.

7. The pulley for the water pump of the engine as claimed in claim 5, wherein the elastic locking device comprises a spring, the spring is disposed between the guide rod and the guide groove, both ends of the spring are respectively connected with the guide rod and the guide groove, or respectively connected with the guide rod and the cam, and the guide rod is always in contact connection with the cam by the spring force.

8. The pulley according to claim 7, wherein the spring is disposed around the guide rod.

9. The pulley for the water pump of an engine as claimed in claim 5, wherein the elastic locking means comprises an elastic band, the elastic band is sleeved outside the multi-spoke driving wheel, and the guide rod is in contact connection with the outer edge of the cam by an inward locking force of the elastic band.

10. The pulley according to claim 2, wherein the pulley further comprises a controller, the controller is connected to the rotary driving mechanism and the water temperature sensor of the engine, and when the controller detects that the actual water temperature of the engine is lower than the target water temperature through the water temperature sensor, the controller controls the rotary driving mechanism to drive the cam to rotate so as to drive the multi-spoke driving wheel to expand outwards, so that the diameter of the multi-spoke driving wheel is increased, and the speed ratio of the pulley is reduced; when the controller detects that the actual water temperature of the engine is higher than the target water temperature through the water temperature sensor, the controller controls the rotary driving mechanism to drive the cam to rotate, the multi-spoke driving wheels are driven to retract, the diameter of the multi-spoke driving wheels is reduced, and the speed ratio of the water pump belt pulley is improved.

Technical Field

The invention relates to the technical field of automobile engines, in particular to a belt pulley of a water pump with a continuously variable diameter of an engine.

Background

The invention relates to a water pump belt pulley of an engine, which realizes different speed ratios under different working states of the engine compared with the conventional water pump belt pulley with a fixed speed ratio of the engine. The water pump belt pulley of the prior art is a fixed speed ratio belt pulley, and the working outer diameter of the water pump belt pulley is fixed. Firstly, in the cold starting stage of the engine, the slower the cooling liquid flows, the effect of quick warm-up can be achieved, and the warm-up speed cannot be changed by the fixed-speed-ratio water pump. Secondly, for the engine water pump, in order to satisfy the low rotational speed cooling demand of engine, the high rotational speed water pump capacity of engine is surplus, because prior art's water pump belt pulley is the constant velocity ratio, leads to the water pump can waste the energy when high rotational speed.

CN2833253Y discloses a belt pulley for a water pump of a diesel engine, wherein two V-shaped grooves with the same groove shape and different diameters are arranged on the outer circular surface of the belt pulley, the distance from the central surface of the two V-shaped grooves to the mounting end surface of the wheel shaft on the same side is equal, and the two V-shaped grooves are respectively mounted on a transmission shaft of the water pump by taking the mounting surfaces on the two sides as the reference, so that the transmission ratio is variable, and the rotating speed of the water pump and the fan can be changed by only one belt pulley to meet different cooling. Because the distances from the mounting surface to the central surfaces of the corresponding V-shaped grooves are equal, the replacement and the adjustment are convenient, the transmission belt can be automatically tensioned in a transmission system, and the cost of the belt pulley is not increased basically.

There are obvious drawbacks in the prior art mentioned above: (1) the diameter of the belt pulley is adjusted by arranging the two V-shaped grooves, and the diameter of the belt pulley is only adjustable by two values, namely the diameters of the two V-shaped grooves correspond to the diameters of the two V-shaped grooves respectively, so that the simple diameter adjustment cannot meet the cooling requirements of the engine under different working conditions; (2) when the diameter of the belt pulley is adjusted, the belt needs to be replaced and adjusted, and the operation is inconvenient.

The speed ratio refers to the diameter ratio of the engine torsional vibration damper to the engine water pump pulley.

In view of this, the present application aims to provide a diameter-variable water pump pulley of an engine, so as to solve the problem that the diameter of the water pump pulley in the prior art cannot be automatically and continuously adjusted.

Disclosure of Invention

The invention aims to solve the technical problem that the diameter of the water pump belt pulley can be automatically and continuously adjusted to realize the continuous adjustment of the speed ratio, and the water temperature of the engine is controlled to be close to the target water temperature through the continuously adjustable speed ratio, so that the working efficiency is improved, the energy of the engine is saved, and the oil consumption and the emission are reduced.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a belt pulley of a water pump with a continuously variable diameter of an engine comprises a fixed wheel, a multi-spoke driving wheel and a cam, wherein the cam is sleeved on an inner ring of the fixed wheel; the multi-spoke driving wheel is connected with the cam, and when the cam rotates relative to the fixed wheel, the multi-spoke driving wheel is driven to expand outwards or contract inwards relative to the fixed wheel.

According to the technical scheme, the cam is connected with a rotary driving mechanism.

According to the technical scheme, the rotary driving mechanism is connected with the cam through the power input shaft.

According to the technical scheme, the rotary driving mechanism is a motor.

According to the technical scheme, the multi-spoke driving wheel comprises a plurality of arc-shaped plates, the arc-shaped plates are circumferentially arranged along a fixed wheel, a plurality of radial guide grooves are circumferentially arranged on the fixed wheel, the radial guide grooves and the arc-shaped plates are arranged in a one-to-one correspondence mode, guide rods are arranged in the radial guide grooves, one ends of the guide rods are connected with the corresponding arc-shaped plates, the other ends of the guide rods are in contact connection with the outer edge of a cam, and an elastic locking device is arranged on the multi-spoke driving wheel and enables the guide rods to be in contact connection with the outer edge; when the cam rotates relative to the fixed wheel, the guide rod moves back and forth along the radial guide groove to drive the arc-shaped plate to move back and forth along the radial direction, so that the diameter of the multi-spoke driving wheel is adjusted.

According to the technical scheme, the number of the arc-shaped plates is 3-5.

According to the technical scheme, the elastic locking device comprises a spring, the spring is arranged between the guide rod and the guide groove, two ends of the spring are respectively connected with the guide rod and the guide groove or respectively connected with the guide rod and the cam, and the guide rod is always in contact connection with the cam through the spring force.

According to the technical scheme, the spring is sleeved on the guide rod.

According to the technical scheme, the elastic locking device comprises an elastic belt, the elastic belt is sleeved outside the multi-spoke driving wheel, and the guide rod is in contact connection with the outer edge of the cam through the inward locking force of the elastic belt.

According to the technical scheme, the continuously variable-diameter water pump belt pulley of the engine further comprises a controller, the controller is respectively connected with the rotary driving mechanism and a water temperature sensor of the engine, when the controller detects that the actual water temperature of the engine is lower than the target water temperature through the water temperature sensor, the controller controls the rotary driving mechanism to drive the cam to rotate, the multi-spoke driving wheels are driven to expand outwards, the diameter of the multi-spoke driving wheels is increased, and the speed ratio of the water pump belt pulley is reduced; when the controller detects that the actual water temperature of the engine is higher than the target water temperature through the water temperature sensor, the controller controls the rotary driving mechanism to drive the cam to rotate, the multi-spoke driving wheels are driven to retract, the diameter of the multi-spoke driving wheels is reduced, and the speed ratio of the water pump belt pulley is improved.

The invention has the following beneficial effects:

the invention can realize automatic and continuous adjustment of the diameter of the water pump belt pulley, change the outer diameter of the water pump belt pulley through the rotation of the cam according to different working conditions of the engine, realize the continuous adjustment of the speed ratio, control the water temperature of the engine near the target water temperature through the continuously adjustable speed ratio, improve the working efficiency, save the energy of the engine, and reduce the oil consumption and the emission.

Drawings

FIG. 1 is a schematic cross-sectional view of a pulley for a continuously variable diameter water pump of an engine in an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a cam in an embodiment of the present invention;

FIG. 3 is a flow chart of the operation of the continuously variable diameter water pump pulley of the engine in an embodiment of the present invention;

in the figure, 1-fixed wheel, 2-multi-spoke driving wheel, 3-cam, 4-power input shaft, L-cam long shaft and M-cam short shaft.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Referring to fig. 1 to 3, the continuously variable diameter water pump pulley of the engine in one embodiment of the present invention includes a fixed pulley 1, a multi-spoke driving pulley 2 and a cam 3, wherein the cam 3 is sleeved on an inner ring of the fixed pulley 1, and the multi-spoke driving pulley 2 is sleeved on an outer ring of the fixed pulley 1; the multi-spoke driving wheel 2 is connected with a cam 3, and when the cam 3 rotates relative to the fixed wheel 1, the multi-spoke driving wheel 2 is driven to expand outwards or contract inwards relative to the fixed wheel.

Further, a rotation drive mechanism is connected to the cam 3.

Further, the rotary drive mechanism is connected to the cam 3 through a power input shaft.

Further, the rotary drive mechanism is a motor.

Furthermore, the multi-spoke driving wheel 2 comprises a plurality of arc-shaped plates, the arc-shaped plates are uniformly arranged along the circumferential direction of the fixed wheel 1, a plurality of radial guide grooves are arranged on the fixed wheel 1 along the circumferential direction, the radial guide grooves and the arc-shaped plates are arranged in a one-to-one correspondence mode, guide rods are arranged in the radial guide grooves, one ends of the guide rods are connected with the corresponding arc-shaped plates, the other ends of the guide rods are in contact connection with the outer edge of the cam 3, and an elastic locking device is arranged on the multi-spoke driving wheel and enables the guide rods to be in contact connection with; when the cam 3 rotates relative to the fixed wheel 1, the guide rod moves back and forth along the radial guide groove to drive the arc-shaped plate to move back and forth along the radial direction, and the diameter of the multi-spoke driving wheel is adjusted.

Further, the number of the arc-shaped plates is 3-5.

Furthermore, the elastic locking device comprises a spring, the spring is arranged between the guide rod and the guide groove, two ends of the spring are respectively connected with the guide rod and the guide groove or respectively connected with the guide rod and the cam 3, and the guide rod is always in contact connection with the cam 3 through the spring force.

Further, the spring is sleeved on the guide rod.

Furthermore, the elastic locking device comprises an elastic belt, the elastic belt is sleeved outside the multi-spoke driving wheel 2, and the guide rod is in contact connection with the outer edge of the cam 3 through the inward locking force of the elastic belt.

Furthermore, a plurality of cam long shafts are arranged on the cam, and the cam long shafts are uniformly distributed on the cam along the circumferential direction; when the long shaft of the cam is contacted with the guide rod, the water pump belt pulley is in a low speed ratio, and when the short shaft of the cam is contacted with the guide rod, the water pump belt pulley is in a high speed ratio.

Further, the continuously variable-diameter water pump pulley of the engine further comprises a controller, the controller is respectively connected with the rotary driving mechanism and a water temperature sensor of the engine, when the controller detects that the actual water temperature of the engine is lower than the target water temperature through the water temperature sensor, the controller controls the rotary driving mechanism to drive the cam 3 to rotate, the multi-spoke driving wheel 2 is driven to expand outwards, the diameter of the multi-spoke driving wheel 2 is increased, and the speed ratio of the water pump pulley is reduced; when the controller detects that the actual water temperature of the engine is higher than the target water temperature through the water temperature sensor, the controller controls the rotary driving mechanism to drive the cam 3 to rotate, the multi-spoke driving wheel 2 is driven to contract inwards, the diameter of the multi-spoke driving wheel 2 is reduced, and the speed ratio of the water pump belt pulley is improved.

The working principle of the invention is as follows: the invention provides a variable-diameter water pump belt pulley aiming at the defects that the diameter of the existing water pump belt pulley is single and cannot be automatically adjusted. The sizes such as the diameter of a water pump impeller influencing the performance of the water pump can be reduced, and the space of the whole machine is saved.

Under the requirements of different working conditions of the engine, the cam 3 is driven to rotate by the power input shaft of the cam 3 on the water pump belt pulley with the variable diameter, so that the outer diameter of the water pump belt pulley is changed, and the effect of changing the speed ratio is achieved; when the long shaft of the cam is contacted with the guide rod, the water pump belt pulley is in a low speed ratio, and when the short shaft of the cam is contacted with the guide rod, the water pump belt pulley is in a high speed ratio.

In the cold starting stage of the engine, the engine water pump belt pulley is controlled to the position with the largest outer diameter by the variable-diameter water pump belt pulley, the speed ratio is lowest, the hydraulic work output by the low-speed-ratio water pump is lowest under the same engine rotating speed, and the flow speed of the cooling liquid is slow. Compared with a fixed-speed-ratio water pump belt pulley, the warm-up time of the variable-diameter water pump belt pulley is shorter. The warm-up time is shortened, and oil consumption and emission can be reduced. When the engine is in a high-rotating-speed working condition, the variable-diameter water pump belt pulley can realize that the water pump provides flow which just meets the cooling requirement of the engine at a proper speed ratio through calibration, saves the energy of the engine, and achieves the purposes of reducing oil consumption and discharging.

As shown in FIG. 1, the variable diameter water pump pulley of the present invention is mainly composed of: the device comprises a fixed wheel 1, a multi-spoke driving wheel 2 and a cam 3 (the shape of the cam is determined according to the number of the multi-spoke driving wheels); the power input shaft on the cam can be driven by a motor or other transmission modes, and the upper shaft of the cam is controlled by the ECU, so that the cam can rotate along the circumferential direction.

The cam and the multi-spoke driving wheel are always in contact by virtue of a spring or a groove is formed at the joint of the cam and the multi-spoke driving wheel, a round elastic belt with the inner diameter smaller than the outer diameter of the multi-spoke driving wheel in a free state can be assembled outside the multi-spoke driving wheel, and the multi-spoke driving wheel is fixed by the elastic belt and cannot be pulled out in the rotating process. The cam rotates to drive the multi-spoke driving wheel to move circumferentially. Through the design of the cam profile, the working radius of the driving wheel can be continuously changed when the cam rotates at different angles, so that the continuous change of the speed ratio is realized. The continuously variable speed ratio may control the water temperature of the engine to be near the target water temperature.

According to the maximum cooling requirement of the engine, the cam profile is designed under the condition that a mechanical water pump with the lowest performance is selected, and the cooling requirement of the engine can be met at the maximum speed ratio. When the cam is designed, the difference between the lowest speed ratio and the highest speed ratio is enlarged as much as possible, the warming-up time can be shortened to the maximum extent, and oil consumption and emission are optimized.

As shown in fig. 2, there are two important parameters for the design of a cam profile: a long cam axis (low speed ratio) and a short cam axis (high speed ratio). The long shaft (low speed ratio) of the cam determines the warming-up speed, and the short shaft (high speed ratio) of the cam determines the highest cooling performance of the water pump. The long axis of the cam is connected with the short axis of the cam by a continuous and smooth curve, and the length from the center of the cam to the cam profile line is shorter when being closer to the short axis of the cam and longer when being closer to the long axis of the cam. In the practical application process, a person skilled in the art can design the cam profile according to the actual requirement.

The variable diameter water pump pulley is controlled by reading the engine water temperature measured by the water temperature sensor through the ECU, by comparison with a calibrated target water temperature, as shown in fig. 2. In the cold starting stage, the actual water temperature of the engine is far lower than the target water temperature, and the cam rotates towards the direction of the low speed ratio to reach the position of the lowest speed ratio; when the actual water temperature is higher than the target water temperature, the motor drives the cam to move in a high speed and a high speed ratio direction, the rotating speed of the water pump is increased, and the engine is cooled; when the engine is changed from high load to low load, the actual water temperature of the engine is changed from higher than the target water temperature to lower than the target water temperature, the motor drives the cam to move towards the low speed ratio direction, the rotating speed of the water pump is reduced, and the water temperature of the engine is increased. Eventually, the actual water temperature of the engine fluctuates around the target water temperature.

The variable-diameter water pump belt pulley and the control method thereof comprise a fixed wheel, a multi-spoke driving wheel and a cam, and the motor on the variable-diameter water pump belt pulley can drive the cam to rotate according to different working conditions of an engine, so that the outer diameter of the water pump belt pulley is changed, and the continuous adjustment of the speed ratio is realized; specifically, the water temperature of the engine measured by the water temperature sensor is read by the ECU, and compared with a calibrated target water temperature, when the actual water temperature is lower than the target water temperature, the cam rotates towards a low speed ratio direction, so that the rotating speed of the water pump is reduced, and the water temperature of the engine is increased; when the actual water temperature is higher than the target water temperature, the motor drives the cam to move towards a high speed in a direction, the rotating speed of the water pump is increased, the engine is cooled, and the water temperature of the engine is controlled to be close to the target water temperature through a continuously adjustable speed ratio.

The above is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereby, and therefore, the present invention is not limited by the scope of the claims.