阅读说明：本技术 一种惯性轮自动切换装置 (Automatic switching device for inertia wheel ) 是由 李江波 伊建辉 杨志强 吕小宇 于 2021-01-04 设计创作，主要内容包括：本申请提供的惯性轮自动切换装置利用空心轴作为惯性轮的旋转轴,将穿设于空心轴内部的中心传动轴作为惯量来源,通过内花键轴、与中心传动轴连接的第一外花键轴、与空心轴连接的第二外花键轴三者之间配合方式的切换实现惯量加载和卸载的切换。本装置优点为,装置中不采用存在摩擦损耗的拨叉结构,设备使用周期长、故障率低,也不采用为拨叉结构配置的润滑油装置和回油装置,因而结构更加简单。(The utility model provides an inertia wheel automatic switching control equipment utilizes the hollow shaft as the rotation axis of inertia wheel, will wear to locate the inside central transmission shaft of hollow shaft as inertia source, through the switching realization inertia loading and the switching of uninstallation of the cooperation mode between internal spline axle, the first external spline axle of being connected with central transmission shaft, the second external spline axle three of being connected with the hollow shaft. The device has the advantages that a shifting fork structure with friction loss is not adopted in the device, the service life of the device is long, the failure rate is low, and a lubricating oil device and an oil return device which are configured for the shifting fork structure are not adopted, so that the structure is simpler.)

1. An automatic switching device of an inertia wheel is characterized by comprising a base and a central transmission shaft arranged on the base; the first external spline shaft is sleeved outside the central transmission shaft and synchronously rotates with the central transmission shaft;

the inertia wheel assembly is sleeved outside the central transmission shaft; a hollow shaft rotatable about the central drive shaft; an inertia wheel connected with the hollow shaft; and a second male spline shaft connected to the hollow shaft adjacent the first male spline shaft; the second external spline shaft is sleeved outside the central transmission shaft and can rotate around the central transmission shaft;

the outside switching mechanism that still overlaps of second external spline shaft, switching mechanism includes:

the inner spline shaft is sleeved outside the second outer spline shaft and is in matched connection with the second outer spline shaft, and the inner spline shaft can be in matched connection with the first outer spline shaft;

the first driving assembly is connected with the inner spline shaft, the first driving assembly is arranged on the base, the inner spline shaft can move axially to a first position under the pushing of the first driving assembly, and the inner spline shaft is connected with the first outer spline shaft and the second outer spline shaft at the first position.

2. The automatic inertia wheel switching device of claim 1, wherein the first driving assembly includes a first bearing sleeved outside the inner spline shaft, a first bearing seat connected to the first bearing, a transition plate connected to the first bearing seat, a first driving member connected to the transition plate, and a mounting plate fixed to the base, the first driving member is fixed to the mounting plate, the mounting plate is further provided with a slide rail extending in an axial direction, and the transition plate can reciprocate along the slide rail under the driving of the first driving member.

3. The automatic inertia wheel shifting apparatus of claim 2, further comprising a locking mechanism operable to lock the spline shaft in the first position when the first drive assembly pushes the spline shaft to the first position.

4. The automatic flywheel switching device of claim 3, wherein the locking mechanism comprises a first positioning plate connected to the transition plate, a second positioning plate disposed on the mounting plate, a second driving member disposed on the mounting plate, and a second telescopic rod connected to the second driving member;

the first positioning plate is provided with a first hole, and the second positioning plate is provided with a second hole;

when the internal spline shaft is located at the first position, the first hole is opposite to the second hole, and the second driving piece can drive the second telescopic rod to simultaneously penetrate through the first hole and the second hole.

5. The automatic inertia wheel switching device of claim 4, wherein the second positioning plate further has a third hole, the third hole is opposite to the first hole when the spline shaft is connected to the second spline shaft only, i.e. when the spline shaft is in the second position, and the second driving member can drive the second telescopic rod to pass through the first hole and the third hole simultaneously.

6. The automatic inertia wheel switching device of claim 4, wherein the slide rail is disposed on an upper surface of the mounting plate, the first driving member is mounted on a lower surface of the mounting plate, the mounting plate is formed with a first through hole, the transition plate is fixedly connected to the connecting rod, and the connecting rod passes through the first through hole and is connected to the first driving member.

7. The automatic inertia wheel switching device of claim 5, wherein the first external spline shaft and the second external spline shaft have first involute gear teeth at the adjacent ends, and the inner side of the internal spline shaft connected with the first external spline shaft has second involute gear teeth capable of meshing with the first involute gear teeth.

8. An automatic switching device for inertia wheels according to any one of claims 1 to 7, wherein two sets of inertia wheels are provided, the two sets of inertia wheels are symmetrically provided about the first external spline shaft, the first external spline shaft is provided with first involute gear teeth at the end adjacent to the second external spline shaft formed by each set of inertia wheels, the internal spline shaft connected with the first external spline shaft in a matching manner and the first driving assembly connected with the internal spline shaft are also provided with two sets, and the inner sides of the two sets of internal spline shafts connected with the first external spline shaft are provided with second involute gear teeth capable of being engaged with the first involute gear teeth.

9. The automatic switching device of inertia wheels according to claim 8, wherein the two sets of inertia wheels are a first inertia wheel set and a second inertia wheel set, respectively, wherein the inertia wheel included in the first inertia wheel set is called a first inertia wheel, the inertia wheel included in the second inertia wheel set is called a second inertia wheel, and the first inertia wheel and the second inertia wheel have different masses.

10. The automatic inertia wheel switching apparatus according to any one of claims 1 to 7, wherein the inertia wheels are formed in at least two sets, and each set of inertia wheels includes inertia wheels having the same or different mass.

Technical Field

The application belongs to the technical field of vehicle brake detection equipment, and particularly relates to an automatic switching device for an inertia wheel.

Background

The vehicle braking performance is usually tested by adopting an inertia test bed, the inertia test bed adopts the rotational inertia of an inertia wheel to simulate the translational inertia in the actual braking process, the rotational inertia of the inertia wheel is realized by replacing or combining the inertia wheels with different masses, and the loading and unloading of the inertia wheel inertia are required to be adjusted according to different testing conditions, however, because the inertia wheel has larger weight, the inertia wheel is very inconvenient to be manually disassembled and switched, the inertia test bed of the prior art is generally fixed by bolts and flanges, the inertia wheel is connected with a main shaft and is realized by the movement of a gear sleeve, the movement of the gear sleeve is required to be realized by a shifting fork structure, when the shifting fork structure shifts the gear sleeve along the axial direction of the main shaft, the shifting fork is directly contacted with the gear sleeve, and the shifting fork can rub with the gear sleeve in the rotating process of the gear sleeve, so the shifting fork inevitably has friction loss, the friction loss of the shifting fork directly influences the position of the shifting fork for shifting the gear sleeve along the axis direction of the main shaft, and further influences the accuracy and stability of connection of the inertia wheel and the main shaft.

Disclosure of Invention

To the not enough of prior art, this application provides an inertia wheel automatic switching control equipment.

The technical scheme of the application is as follows:

an automatic switching device of an inertia wheel comprises a base and a central transmission shaft arranged on the base; the first external spline shaft is sleeved outside the central transmission shaft and synchronously rotates with the central transmission shaft;

the inertia wheel assembly is sleeved outside the central transmission shaft; a hollow shaft rotatable about the central drive shaft; an inertia wheel connected with the hollow shaft; and a second male spline shaft connected to the hollow shaft adjacent the first male spline shaft; the second external spline shaft is sleeved outside the central transmission shaft and can rotate around the central transmission shaft;

the outside switching mechanism that still overlaps of second external spline shaft, switching mechanism includes:

the inner spline shaft is sleeved outside the second outer spline shaft and is in matched connection with the second outer spline shaft, and the inner spline shaft can be in matched connection with the first outer spline shaft;

the first driving assembly is connected with the inner spline shaft, the first driving assembly is arranged on the base, the inner spline shaft can move axially to a first position under the pushing of the first driving assembly, and the inner spline shaft is connected with the first outer spline shaft and the second outer spline shaft at the first position.

In some embodiments of the present application, the first driving assembly includes a first bearing sleeved outside the inner spline shaft, a first bearing seat connected to the first bearing seat, a transition plate connected to the first bearing seat, a first driving member connected to the transition plate, and a mounting plate fixed to the base, the first driving member is fixed to the mounting plate, a slide rail extending along an axial direction is further provided on the mounting plate, and the transition plate can be pushed by the first driving member to move along the slide rail in a reciprocating manner.

In some embodiments of the present application, the automatic inertia wheel switching device further includes a locking mechanism that can lock the spline shaft in the first position when the first drive assembly pushes the spline shaft to the first position.

In some embodiments of the present application, the locking mechanism includes a first positioning plate connected to the transition plate, a second positioning plate disposed on the mounting plate, a second driving member disposed on the mounting plate, and a second telescopic rod connected to the second driving member;

the first positioning plate is provided with a first hole, and the second positioning plate is provided with a second hole;

when the internal spline shaft is located at the first position, the first hole is opposite to the second hole, and the second driving piece can drive the second telescopic rod to simultaneously penetrate through the first hole and the second hole.

In some embodiments of the present application, a third hole is further disposed on the second positioning plate, when the spline shaft is connected to the second spline shaft, that is, when the spline shaft is located at the second position, the third hole is opposite to the first hole, and the second driving member can drive the second telescopic rod to simultaneously penetrate through the first hole and the third hole.

In some embodiments of the present application, the slide rail is disposed on an upper surface of the mounting plate, the first driving element is mounted on a lower surface of the mounting plate, a first through hole is formed in the mounting plate, the transition plate is fixedly connected to the connecting rod, and the connecting rod passes through the first through hole and is connected to the first driving element.

In some embodiments of this application, first external spline axle with the adjacent tip of second external spline axle is equipped with the first tooth of involute, the internal spline axle with the inboard that first external spline axle is connected be equipped with can with the first tooth's that gradually bursts at seams second tooth of involute of tooth meshing.

In some embodiments of this application, the flywheel is constituteed and is set up two sets ofly, and is two sets of the flywheel is constituteed about first external spline shaft symmetry sets up, the tip that first external spline shaft and the second external spline shaft that every group flywheel is constituteed are adjacent all is equipped with the first tooth of involute, with first external spline shaft cooperation is connected internal spline shaft and with internal spline shaft connects first drive assembly also sets up two sets ofly, two sets of internal spline shafts with the inboard that first external spline shaft is connected all be equipped with can with the first tooth of involute tooth's mesh's second tooth of involute.

In some embodiments of the present application, the two sets of inertia wheel assemblies are respectively a first inertia wheel assembly and a second inertia wheel assembly, where an inertia wheel included in the first inertia wheel assembly is referred to as a first inertia wheel, an inertia wheel included in the second inertia wheel assembly is referred to as a second inertia wheel, and the masses of the first inertia wheel and the second inertia wheel are different.

In some embodiments of the present application, the inertia wheels are comprised in at least two sets, and each inertia wheel set includes inertia wheels having the same or different masses.

Compared with the prior art, the beneficial effect of this application is:

the utility model provides an inertia wheel automatic switching control equipment utilizes the hollow shaft as the rotation axis of inertia wheel, will wear to locate the inside central transmission shaft of hollow shaft as inertia source, through the switching realization inertia loading and the switching of uninstallation of the cooperation mode between internal spline axle, the first external spline axle of being connected with central transmission shaft, the second external spline axle three of being connected with the hollow shaft. The device has the advantages that a shifting fork structure with friction loss is not adopted in the device, the service life of the device is long, the failure rate is low, and a lubricating oil device and an oil return device are not configured for the shifting fork structure, so that the structure is simpler.

The internal spline shaft and the first driving assembly are not abraded or positioned, so that the first external spline shaft, the second external spline shaft and the internal spline shaft are matched and connected more accurately and stably.

Through the cooperation of first driving piece drive internal spline axle and first external spline axle and be connected, internal spline axle sets up the matched with first external spline axle and rolls on the involute teeth of a cogwheel, realizes the cooperation between them through the meshing of the teeth of a cogwheel and connects, does not have violent impact during the meshing.

The first external spline shaft, the second external spline shaft and the internal spline shaft are installed through the bearings, so that the bearings are long in service life and convenient to replace.

When the inertia wheel is loaded by inertia, the locking mechanism locks the positions of the first bearing seat and the transition plate to prevent the first bearing seat and the transition plate from rotating along with the central transmission shaft and the inner spline shaft.

The number of the inertia wheel components can be flexibly increased according to needs, the inertia loading of each group of inertia wheel components can be independently controlled, and the inertia test range is greatly widened.

Drawings

Fig. 1 is a schematic structural diagram 1 of an automatic switching device of an inertia wheel according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of an automatic switching device of an inertia wheel according to an embodiment of the present application 2;

FIG. 3 is a schematic cross-sectional view taken along section line A-A in FIG. 1;

FIG. 4 is a schematic structural view 1 of the first drive assembly and the female spline shaft of one embodiment of the present application;

FIG. 5 is a schematic cross-sectional view taken along section line B-B in FIG. 4;

FIG. 6 is a schematic structural view 2 of the first drive assembly and the female spline shaft of one embodiment of the present application;

FIG. 7 is a schematic structural view 3 of the first drive assembly and the female spline shaft of one embodiment of the present application;

FIG. 8 is a cross-sectional view of an embodiment of an automatic flywheel switching device of the present application;

FIG. 9 is a schematic structural view of the central drive shaft and the first male spline shaft of one embodiment of the present application;

FIG. 10 is a cross-sectional view of the central drive shaft and the first male spline shaft of FIG. 9;

FIG. 11 is a cross-sectional view of an embodiment of a hollow shaft and inertia wheel;

in the figure: 1. a base; 2. a central drive shaft; 21. a second bearing; 22. a second bearing housing; 3. a first external spline shaft; 31. first involute gear teeth; 41. a hollow shaft; 411. a third bearing; 412. a third bearing seat; 42. an inertia wheel; 43: a second male spline shaft; 431. an external spline portion; 432. a connecting shaft portion; 5. a female spline shaft; 51. a baffle plate; 52. second involute gear teeth; 6. a first drive assembly; 61. a first bearing; 62. a first bearing housing; 63. a transition plate; 64. a first driving member; 641. a first telescopic rod; 65. mounting a plate; 651. a first through hole; 66. a slide rail; 67. a connecting rod; 7. a locking mechanism; 71. a first positioning plate; 711. a first hole; 72. a second positioning plate; 721. a second hole; 722. a third aperture; 73. a second driving member; 731. and a second telescopic rod.

Detailed Description

The technical solutions of the present application are explained in detail below with reference to specific embodiments, however, it should be understood that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.

In the description of the present application, it is to be understood that the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In the description of the present application, it is to be understood that the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on those shown in the corresponding drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiments described above are merely preferred embodiments of the present application, and are not intended to limit the scope of the present application, and various modifications and improvements made to the technical solutions of the present application by those skilled in the art without departing from the spirit of the present application should fall within the protection scope defined by the claims of the present application. For convenience of description, a direction parallel to the axis of the central drive shaft is referred to as an axial direction.

As shown in fig. 1 to 3, an automatic switching device for an inertia wheel provided in an embodiment of the present application includes a base 1, a central transmission shaft 2 disposed on the base 1; the first external spline shaft 3 is sleeved outside the central transmission shaft 2 and synchronously rotates with the central transmission shaft 2;

the inertia wheel assembly comprises a hollow shaft 41, an inertia wheel 42 and a second external spline shaft 43, wherein the hollow shaft 41 is sleeved outside the central transmission shaft 2 and can rotate around the central transmission shaft 2, the inertia wheel 42 is connected with the hollow shaft 41, and the second external spline shaft 43 is connected to the hollow shaft 41 and is adjacent to the first external spline shaft 3; the second external spline shaft 43 is sleeved outside the central transmission shaft 2 and can rotate around the central transmission shaft 2;

the outside switching mechanism that still overlaps of second external spline shaft 43, switching mechanism include:

the female spline shaft 5 is sleeved outside the second male spline shaft 42 and is in matched connection with the second male spline shaft, and the female spline shaft 5 can be in matched connection with the first male spline shaft 3;

first drive assembly 6, first drive assembly 6 links to each other with female spline shaft 5, and first drive assembly 6 sets up on base 1, and female spline shaft 5 can be under the first drive assembly 6 promotes axial displacement to the primary importance, and when the primary importance, female spline shaft 5 all is connected with first external spline shaft 3 and second external spline shaft 43.

The application provides an inertia wheel automatic switching control equipment, support inertia wheel 42 on base 1 through hollow shaft 41 steadily, hollow shaft 41 drives inertia wheel 42 rotatory, and then inertia wheel 42 obtains the inertia loading, and inertia output of inertia wheel 42 is more stable. The internal spline shaft 5 moves in a reciprocating manner along the axial direction under the pushing of the first driving assembly 6, when the internal spline shaft 5 is only connected with the second external spline shaft 43 in a shaft matching manner, the inertia wheel 42 does not rotate along with the central transmission shaft 2, when the internal spline shaft 5 is simultaneously connected with the first external spline shaft 3 and the second external spline shaft 43 in a shaft matching manner, the central transmission shaft 2 drives the first external spline shaft 3 to rotate, the first external spline shaft 3 drives the second external spline shaft 43 to rotate together through the internal spline shaft 5, and then the inertia wheel 42 connected with the second external spline shaft 43 is driven to rotate together, and the inertia wheel 42 is subjected to inertia loading at the moment.

Specifically, as shown in fig. 4 and 5, the first driving assembly 6 includes a first bearing 61 sleeved outside the internal spline shaft 5, a first bearing seat 62 connected to the first bearing seat 61, a transition plate 63 connected to the first bearing seat 62, a first driving member 64 connected to the transition plate 63, and a mounting plate 65 fixed to the base 1, the first driving member 64 is fixed to the mounting plate 65, a slide rail 66 extending in the axial direction is further disposed on the mounting plate 65, and the transition plate 63 can reciprocate along the slide rail 66 under the pushing of the first driving member 64, so that the transition plate 63 can drive the internal spline shaft 5 to move to the first position. The first bearing 61 is fixed to the first bearing housing 62 by a housing end cap 621. The side of the female spline shaft 5 adjacent to the inertia wheel 42 is connected with a baffle 51, the baffle 51 protrudes from the inner wall of the female spline shaft 5, as shown in fig. 11, the second female spline shaft 43 includes a male spline portion 431 and a connecting shaft portion 432, the male spline portion 431 protrudes from the connecting shaft portion 432, and the protruding male spline portion 431 just limits the moving range of the protruding baffle 51, thereby preventing the female spline shaft 5 from being separated from the second female spline shaft 43. The first driving part 64 pushes the transition plate 63, the transition plate 63 drives the first bearing seat 62 to move, the first bearing seat 62 is sleeved outside the inner spline shaft 5 in the moving process, and therefore the side face of the first bearing seat 62 does not need to be in contact with the inner spline shaft 5 to apply a driving force to the inner spline shaft 5 and can also realize the movement of the inner spline shaft 5, so that the side face of the first bearing seat 62 cannot be abraded with the inner spline shaft 5, the positioning of the inner spline shaft 5 cannot be influenced, and the matching connection of the inner spline shaft 5 and the first outer spline shaft 3 cannot be influenced.

Preferably, as shown in fig. 4 to 6, the automatic inertia wheel switching apparatus further includes a locking mechanism 7, and the locking mechanism 7 can lock the female spline shaft 5 in the first position when the first drive assembly 6 pushes the female spline shaft 5 to the first position. The locking mechanism 7 serves to stably position the female spline shaft 5 in the first position, maintaining the female spline shaft 5 in stable mating connection with the first and second male spline shafts 3 and 43.

Specifically, as shown in fig. 4, 6 and 7, the locking mechanism 7 includes a first positioning plate 71 connected to the transition plate 63, a second positioning plate 72 disposed on the mounting plate 65, a second driving member 73 disposed on the mounting plate 65, and a second telescopic rod 731 connected to the second driving member 73; the first positioning plate 71 has a first hole 711, the second positioning plate 72 has a second hole 721, when the internal spline shaft 5 is at the first position, the first hole 711 is just opposite to the second hole 721, and the second driving member 73 can drive the second telescopic rod 731 to pass through the first hole 711 and the second hole 721 simultaneously. The second telescopic link 731, which is inserted through the first hole 711 and the second hole 721, restricts the relative axial movement of the second positioning plate 72 and the first positioning plate 71, thereby restricting the internal spline shaft 5 at the first position. As shown in fig. 8, the left-hand female spline shaft 5 is engaged with both the first male spline shaft 3 and the second male spline shaft 43, and at this time, the inertia wheel 42 on the left-hand side is subjected to inertia load while the right-hand female spline shaft 5 is engaged with only the second male spline shaft 43, and the inertia wheel 42 on the right-hand side is not subjected to inertia load while the center drive shaft 2 is rotating.

Optionally, the second positioning plate 72 is further provided with a third hole 722, when the spline shaft 5 is connected with the second spline shaft 43 only, that is, when the spline shaft 5 is in the second position, the third hole 722 is just opposite to the first hole 711, the second telescopic rod 731 can axially extend and retract, and the second driving member 73 can drive the second telescopic rod 731 to simultaneously penetrate through the first hole 711 and the third hole 722, so as to limit the spline shaft 5 in the second position. The second telescopic link 731 inserted into the first hole 711 and the third hole 722 limits the axial relative movement between the second positioning plate 72 and the first positioning plate 71, so as to limit the internal spline shaft 5 at the second position, and prevent the internal spline shaft 5 from changing in position due to the influence of mechanical vibration. As shown in fig. 3, the female spline shaft 5 is in the second position, which is engaged with only the second male spline shaft 43.

In order to prevent the internal spline shaft from moving in the axial direction, as shown in fig. 4 and 6, a slide rail 66 is provided on the upper surface of the mounting plate 65, a first driving member 64 is mounted on the lower surface of the mounting plate 65, a first through hole 651 is formed in the mounting plate 65, the transition plate 63 is fixedly connected to the connecting rod 67, and the connecting rod 67 is connected to the first driving member 64 through the first through hole 651. The connecting rod 67 is fixedly connected to the transition plate 63, the first driving member 64 includes a first telescopic rod 641 fixedly connected to the connecting rod 67, and the first telescopic rod 641 extends and retracts in the axial direction, so as to push the connecting rod 67 to move in the axial direction, and further drive the transition plate 63 to move in the axial direction. The first through hole 651 does not hinder the movement of the link 67 when the female spline shaft 5 reciprocates between the first position and the second position. The first driving member 64 can be a telescopic cylinder, and the inertia loading of the inertia wheel 42 can be accurately controlled by precisely controlling the telescopic distance of the telescopic cylinder and controlling the fit connection of the female spline shaft 5 and the first and second male spline shafts 3 and 43.

Specifically, the action relationship between the first driving member 64 and the second driving member 73 can be realized by a magnetic switch, and the magnetic switch is disposed in the first driving member 64. The second driving member 73 can be a telescopic cylinder, when the first driving member 64 drives the spline shaft 5 to move to the first position, the magnetic switch is triggered, and the magnetic switch controls the second driving member 73 to start, so as to drive the second telescopic rod 731 to extend out.

Specifically, as shown in fig. 9 and 10, the central transmission shaft 2 is sleeved with a second bearing 21, the second bearing 21 is connected with a second bearing seat 22, and the second bearing seat 22 is fixedly connected with the base 1. One end of the central transmission shaft can be connected with a third driving part through a coupling so as to provide an inertia source for the inertia wheel, the third driving part is a device for generating driving torque, and for example, the third driving part can be a motor. The other end of the central transmission shaft is connected with a part needing inertia experiment test, such as a brake.

Specifically, as shown in fig. 9 and 10, the first male spline shaft 3 is keyed with the center drive shaft 2. As shown in fig. 5 and 9, the first involute gear teeth 31 are provided on the end portions of the first male spline shaft 3 adjacent to the second male spline shaft 43, and the second involute gear teeth 52 engageable with the first involute gear teeth 31 are provided on the inner side of the female spline shaft 5 connected to the first male spline shaft 3. The internal spline shaft 5 is pushed by the first driving member 64 to move back and forth in the axial direction, when the internal spline shaft 5 is only engaged with the teeth of the second external spline shaft 43, the inertia wheel 42 does not rotate together with the central transmission shaft 2, when the internal spline shaft 5 is simultaneously engaged with the teeth of the first external spline shaft 3 and the second external spline shaft 43, the central transmission shaft 2 drives the first external spline shaft 3 to rotate, the first external spline shaft 3 drives the second external spline shaft 43 to rotate together through the internal spline shaft 5, and then the inertia wheel 42 connected with the second external spline shaft 43 is driven to rotate together, and at this time, the inertia wheel 42 has inertia loading.

Usually, in order to facilitate the engagement of the internal spline shaft 3 and the first external spline shaft 43, the central transmission shaft 2 rotates at a low speed, and then drives the first external spline shaft 3 to rotate at a low speed, the internal spline shaft 5 is close to the first external spline shaft 3 under the action of the first driving member 64, and when the first external spline shaft 3 rotates until the first involute gear teeth 31 engage with the second involute gear teeth 52, the first driving member 64 further pushes the internal spline shaft 5 in the axial direction, and then the stable fit connection of the internal spline shaft 5 and the first external spline shaft 3 is realized. The distance of the axial movement of the female spline shaft 5 is not so large that the female spline shaft 5 separates from the second male spline shaft 43, and the female spline shaft 5 can be simultaneously connected with the first male spline shaft 3 and the second male spline shaft 43 in a mating manner. After the internal spline shaft 5 is matched and connected with the first external spline shaft 3 and the second external spline shaft 43 at the same time, the rotating speed of the central transmission shaft 2 is increased, and the inertia wheel 42 connected with the second external spline shaft 43 is subjected to inertia loading.

Alternatively, as shown in fig. 11, the hollow shaft 41 is a stepped shaft, and the inertia wheel 42 is fixedly connected to the hollow shaft 41 by a screw. The hollow shaft 41 is mounted on the base 1 at two ends through the cooperation of the third bearing 411 and the third bearing seat 412, so that the inertia wheel 42 is supported by the base 1. The hollow shaft 41 and the second external spline 43 are fixedly connected by screws.

Alternatively, as shown in fig. 1 to 3, two sets of inertia wheel assemblies are disposed outside the central transmission shaft 2, the two sets of inertia wheel assemblies are disposed symmetrically with respect to the first external spline shaft 3, the first external spline shaft 3 is of a symmetrical structure, that is, two ends of the first external spline shaft 3 adjacent to the second external spline shaft 43 formed by each set of inertia wheels are provided with first involute gear teeth 31, two sets of internal spline shafts 5 connected with the first external spline shafts 3 in a matching manner and two sets of first driving assemblies 6 connected with the internal spline shafts 5 are also disposed, two sets of internal spline shafts 5 are provided with second involute gear teeth 52 capable of meshing with the first involute gear teeth 31 on the inner side connected with the first external spline shafts 3, and each set of internal spline shafts 5 can be driven by one set of first driving assemblies 6 to reciprocate in the axial direction.

Optionally, the two sets of inertia wheel assemblies are respectively a first inertia wheel assembly and a second inertia wheel assembly, wherein the inertia wheel included in the first inertia wheel assembly is called a first inertia wheel, the inertia wheel included in the second inertia wheel assembly is called a second inertia wheel, and the masses of the first inertia wheel and the second inertia wheel are different. During the inertia test, the inertia wheels with different masses can be arranged according to the test requirements, so that the loaded inertia required by the test can be obtained through the superposition and combination of the inertia wheels with different masses.

Optionally, the inertia wheels sleeved outside the central transmission shaft are at least two groups, for example, two groups, three groups or more, and the inertia wheels included in each group of inertia wheel group have the same or different mass. The inertia loading of each group of inertia wheels can be independently controlled, and the test range of the inertia test is greatly widened.

The present application is described in detail with reference to the following examples, which are to be understood as the preferred embodiments of the present application, and not as limiting the scope of the present application.

Examples

As shown in fig. 1-3, an automatic switching device for inertia wheels comprises a base 1, a central transmission shaft 2 arranged on the base 1; the first external spline shaft 3 is sleeved outside the central transmission shaft 2 and is connected with the central transmission shaft 2; the two groups of inertia wheels respectively comprise a hollow shaft 41 which is sleeved outside the central transmission shaft 2 and can rotate around the central transmission shaft 2, an inertia wheel 42 connected with the hollow shaft 41, and a second external spline shaft 43 which is connected to the hollow shaft 41 and is adjacent to the first external spline shaft 3; the second external spline shaft 43 is sleeved outside the central transmission shaft 2 and can rotate around the central transmission shaft 2;

the second male spline shaft 43 is also externally fitted with a female spline shaft 5 which is engaged with the second male spline shaft, and the female spline shaft 5 can be engaged with the first male spline shaft 3;

the internal spline shaft 5 is connected with a first driving assembly 6, the first driving assembly 6 is fixed on the base 1, the internal spline shaft 5 can move axially to a first position under the pushing of the first driving assembly 6, and the internal spline shaft 5 is meshed with the first external spline shaft 3 and the second external spline shaft 43 at the first position;

the inertia wheels formed by the two groups of inertia wheels can have the same mass or different masses.