EMB service braking transmission system and vehicle

Abstract

The utility model relates to the technical field of mechanical transmission, in particular to an EMB service braking transmission system and a vehicle. According to the EMB service braking transmission system, the spline teeth are provided with the wedge-shaped faces, the limiting grooves are provided with the wedge-shaped groove walls, and after the splines stretch into the limiting grooves, the slope groove walls are at least partially attached to the wedge-shaped faces, so that a rotation gap between the spline shaft and the transmission shaft can be eliminated; in addition, the pushing structure always tends to push one of the transmission shaft and the spline shaft, so that one of the transmission shaft and the spline shaft gets close to the other one, the rotation gap is further eliminated, and the gap generated by abrasion of the slope groove wall and the wedge-shaped face is prevented. According to the arrangement, the idle stroke problem of the driving motor caused by the rotation gap can be avoided, the stroke control precision of the driving motor is improved, abrasion and transmission noise of the spline teeth are reduced, and the service life of the spline is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission, in particular to an EMB service brake transmission system and a vehicle. Background Art

[0002] At present, the pinion of the EMB gearbox is connected to the drive motor shaft through an ordinary spline. Ordinary splines generally use tooth splines or polygonal splines. Ordinary splines have a rotational clearance, which will increase the idle stroke of the drive motor during restart, affecting the stroke control accuracy of the drive motor. At the same time, it will also increase the wear of the spline and shorten the service life of the spline.

[0003] Therefore, there is an urgent need for an EMB service brake transmission system to solve the above technical problems. Utility Model Content

[0004] The purpose of the utility model is to provide an EMB service brake transmission system and a vehicle, which can eliminate the rotational clearance between the drive motor and the spline and avoid the idle stroke of the drive motor during rotation.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] In a first aspect, an EMB service brake transmission system is provided, comprising:

[0007] Drive motor;

[0008] A spline shaft fixedly connected to the output shaft of the drive motor, the spline shaft comprising a shaft body and a plurality of spline teeth arranged along the circumference of the shaft body, the spline teeth having at least one wedge-shaped surface;

[0009] A transmission shaft is sleeved with a driving gear, the transmission shaft is provided with a spline hole, the spline hole includes a connecting hole and a limiting groove arranged circumferentially along the hole wall of the connecting hole, the limiting groove has at least one wedge-shaped groove wall, the spline shaft is inserted into the spline hole, the spline teeth are located in the limiting groove, and the wedge-shaped groove wall is at least partially in contact with the wedge-shaped surface;

[0010] The pushing structure is used to push one of the transmission shaft and the spline shaft to always have a tendency to move toward the other.

[0011] As an optimal technical solution for the above-mentioned EMB service brake transmission system, the limiting groove also has a straight groove wall, which is arranged opposite to the wedge-shaped groove wall, and the spline tooth also has a straight surface, which is arranged opposite to the wedge-shaped surface.

[0012] As a preferred technical solution of the above-mentioned EMB service brake transmission system, it also includes a gearbox housing and a gearbox end cover, the gearbox end cover is connected to the gearbox housing, one end of the transmission shaft is rotatably connected to the gearbox end cover via a first bearing, and the other end of the transmission shaft is rotatably connected to the gearbox housing via a second bearing, and the driving gear is located in a cavity formed by the gearbox end cover and the gearbox housing.

[0013] As an optimal technical solution for the above-mentioned EMB service brake transmission system, a pushing structure is arranged between the gear box end cover and the first bearing. The pushing structure contacts the gear box end cover and the first bearing respectively, and the pushing structure always has a tendency to push the first bearing toward the driving motor.

[0014] As a preferred technical solution of the above-mentioned EMB service brake transmission system, the pushing structure includes a wave spring.

[0015] As a preferred technical solution of the above-mentioned EMB service brake transmission system, the pushing structure includes an elastic gasket.

[0016] As a preferred technical solution of the above-mentioned EMB service brake transmission system, the number of the spline teeth is not less than three.

[0017] As a preferred technical solution of the above-mentioned EMB service brake transmission system, the spline teeth are evenly arranged along the circumference of the spline shaft.

[0018] As a preferred technical solution of the above-mentioned EMB service brake transmission system, the wedge angle a of the wedge surface is 5°-10°.

[0019] The second method provides a vehicle comprising the EMB service brake transmission system described in any of the above schemes.

[0020] The utility model has at least the following beneficial effects:

[0021] The EMB service brake transmission system and vehicle provided by the utility model have spline teeth with wedge-shaped surfaces and a retaining groove with wedge-shaped groove walls. When the spline extends into the retaining groove, the inclined groove walls at least partially align with the wedge surfaces, thereby eliminating the rotational clearance between the spline shaft and the drive shaft. Furthermore, the thrust structure constantly pushes one of the drive shaft and the spline shaft toward the other, further eliminating rotational clearance and preventing the formation of clearance due to wear between the inclined groove walls and the wedge surfaces. This arrangement avoids the problem of idle travel of the drive motor caused by rotational clearance, improves the stroke control accuracy of the drive motor, reduces wear on the spline teeth and transmission noise, and increases the service life of the spline. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of the EMB service brake transmission system provided in an embodiment of the present utility model;

[0024] Figure 2 An exploded schematic diagram of a spline shaft and a transmission shaft provided in an embodiment of the present utility model;

[0025] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0026] Figure 4 A side view of a spline shaft provided in an embodiment of the present utility model;

[0027] Figure 5 A schematic structural diagram of a transmission shaft provided in an embodiment of the present utility model;

[0028] Figure 6 for Figure 5 side view.

[0029] In the picture:

[0030] 1. Spline shaft; 11. Shaft body; 12. Spline teeth; 121. Wedge surface; 122. Straight surface; 2. Drive shaft; 21. Spline hole; 211. Connecting hole; 212. Limiting groove; 2121. Wedge groove wall; 2122. Straight groove wall; 3. Push structure; 4. Gearbox housing; 5. Gearbox end cover; 6. First bearing; 7. Second bearing. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0032] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two element internal communication or two element mutual action relation.For ordinary skilled in the art, can understand the specific meaning of the above terms in the utility model according to specific circumstances.

[0033] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional feature between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the first feature horizontal height is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the first feature horizontal height is less than the second feature.

[0034] In the description of the embodiment, the term "on", "under", "right", etc. Orientation or position relationship is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0035] The utility model provides a kind of EMB driving brake transmission system and vehicle, can eliminate the rotary gap between driving motor and spline, avoid driving motor idle stroke when rotating.

[0036] As Figures 1 to 6As shown, the EMB service brake transmission system includes a drive motor, a spline shaft 1 and a transmission shaft 2, wherein the spline shaft 1 is fixedly connected to the output shaft of the drive motor, the spline shaft 1 includes a shaft body 11 and a plurality of spline teeth 12 arranged along the circumference of the shaft body 11, and the spline teeth 12 have at least one wedge-shaped surface 121; the transmission shaft 2 is sleeved with a driving gear, and the transmission shaft 2 is provided with a spline hole 21, the spline hole 21 includes a connecting hole 211 and a limiting groove 212 arranged along the circumference of the hole wall of the connecting hole 211, and the limiting groove 212 is arranged. It has at least one wedge-shaped groove wall 2121, and the spline shaft 1 is inserted into the spline hole 21. The wedge-shaped groove wall 2121 is at least partially in contact with the wedge surface 121. In this way, when the drive motor rotates, the wedge-shaped groove wall 2121 and the wedge surface 121 are in contact with each other without any rotational clearance. The pushing structure 3 is used to push one of the transmission shaft 2 and the spline shaft 1, and it always has a tendency to move toward the other, which can ensure that the wedge-shaped groove wall 2121 is always in contact with the wedge surface 121, avoiding the rotational clearance caused by wear.

[0037] The EMB service brake transmission system provided by the present invention comprises a spline tooth 12 having a wedge-shaped surface 121, and a retaining groove 212 having a wedge-shaped groove wall 2121. When the spline extends into the retaining groove 212, the wedge-shaped groove wall 2121 at least partially abuts the wedge-shaped surface 121, thereby eliminating the rotational clearance between the spline shaft 1 and the transmission shaft 2. Furthermore, the thrust structure 3 constantly pushes one of the transmission shaft 2 and the spline shaft 1, forcing one toward the other, further eliminating the rotational clearance and preventing the wedge-shaped groove wall 2121 from abrading against the wedge-shaped surface 121. This arrangement avoids the problem of idle travel of the drive motor caused by rotational clearance, improves the stroke control accuracy of the drive motor, reduces wear on the spline teeth 12 and transmission noise, and increases the service life of the spline.

[0038] For example, the spline shaft 1 is connected to the output shaft of the driving motor via a coupling, or the spline shaft 1 and the output shaft of the driving motor are an integrated structure.

[0039] In some embodiments, as Figures 2 to 6 As shown, to facilitate machining of the spline hole 21, the limiting groove 212 further includes a straight groove wall 2122, which is disposed opposite the wedge-shaped groove wall 2121. The spline tooth 12 further includes a straight surface 122, which is disposed opposite the wedge-shaped surface 121. The straight groove wall 2122 is easier to machine than the wedge-shaped groove wall 2121, and the straight surface 122 is even easier to machine than the wedge-shaped surface 121.

[0040] In some embodiments, continue to refer to Figure 1The EMB driving brake transmission system further comprises a gear box shell 4 and a gear box end cover 5, the gear box end cover 5 is connected with the gear box shell 4, one end of the transmission shaft 2 is rotatably connected with the gear box end cover 5 through a first bearing 6, the other end of the transmission shaft 2 is rotatably connected with the gear box shell 4 through a second bearing 7, and the driving gear is located in a cavity formed by the gear box end cover 5 and the gear box shell 4. A driven gear is further arranged in the gear box shell 4, the driven gear is engaged with the driving gear, and under the driving of the driving motor, the driving gear rotates to drive the driven gear to rotate to realize power transmission. For example, the first bearing 6 is a rolling bearing, and the second bearing 7 is a rolling bearing.

[0041] Further, a pushing structure 3 is arranged between the gear box end cover 5 and the first bearing 6, the pushing structure 3 is in contact with the gear box end cover 5 and the first bearing 6 respectively, and the pushing structure 3 always has a tendency to push the first bearing 6 to move towards the driving motor. Since the first bearing 6 is in interference fit with the transmission shaft 2, the pushing force received by the first bearing 6 will be transmitted to the transmission shaft 2, and the transmission shaft 2 will also have a tendency to move towards the driving motor, so that the wedge-shaped groove wall 2121 and the wedge surface 121 are always in contact, thereby eliminating the rotary gap between the spline teeth 12 and the limiting groove 212.

[0042] In some embodiments, the wedge angle a of the wedge surface 121 is 5°-10°. Alternatively, the wedge angle a of the wedge surface 121 is 5°, 6°, 7°, 8°, 9° or 10°, which is not limited in the embodiment.

[0043] In some embodiments, the number of spline teeth 12 is not less than three. In this way, the driving motor can reduce the torsional force received by each spline tooth 12 during rotation, thereby avoiding that the spline tooth 12 is easily broken after long-term work.

[0044] Further, the spline teeth 12 are uniformly arranged along the circumference of the spline shaft 1, so as to ensure that the force received by each spline tooth 12 is uniform, thereby avoiding that the single spline tooth 12 is broken due to uneven force. Along the axial direction from the driving motor to the transmission shaft 2, the width of the spline tooth 12 gradually decreases. For a single limiting groove 212, the width of the limiting groove 212 gradually decreases from the driving motor to the first bearing 6.

[0045] The pushing structure 3 comprises a wave spring. The wave spring has a small height, so that the overall structure of the EMB driving brake transmission system is more compact. In addition, the wave spring has the characteristics of light weight, which saves the production time and material cost. Further, the wave spring can provide the same spring force in a smaller space, thereby reducing the size, weight, production time and material cost of assembly.

[0046] In some other embodiments, the pushing structure 3 includes an elastic washer, which can also make the transmission shaft 2 always have a tendency to move toward the driving motor to eliminate the rotational clearance.

[0047] In some other embodiments, the pushing structure 3 may also include a hydraulic push block, which is pushed to move toward the drive motor by injecting hydraulic oil into the hydraulic push block, thereby pushing the transmission shaft 2 to always have a tendency to move toward the drive motor. The specific structure of the hydraulic push block and the specific connection method of the hydraulic push block and the hydraulic system are all existing technologies and will not be described in detail here.

[0048] The utility model also provides a vehicle, comprising the EMB service brake transmission system provided by the utility model.

[0049] The vehicle provided by the utility model includes an EMB service brake transmission system. Because the spline teeth 12 have wedge-shaped surfaces 121 and the limiting groove 212 has wedge-shaped groove walls 2121, when the spline extends into the limiting groove 212, the wedge-shaped groove walls 2121 at least partially abut against the wedge-shaped surfaces 121, thereby eliminating the rotational clearance between the spline shaft 1 and the transmission shaft 2. Furthermore, the thrust structure 3 always tends to push one of the transmission shaft 2 and the spline shaft 1, thereby forcing one toward the other, further eliminating the rotational clearance and preventing the wedge-shaped groove walls 2121 from abrading against the wedge-shaped surfaces 121. This arrangement can avoid the problem of idle travel of the drive motor caused by rotational clearance, improve the stroke control accuracy of the drive motor, reduce wear of the spline teeth 12 and transmission noise, increase the service life of the spline, and thereby improve the overall operational performance of the vehicle.

[0050] Since the vehicle includes the above-mentioned EMB service brake transmission system, the vehicle of the embodiment of the present utility model has all the advantages and beneficial effects of the above-mentioned embodiments, which will not be described in detail here.

[0051] Furthermore, the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. An EMB service brake transmission system, characterized in that: include: Drive motor; A spline shaft (1) is fixedly connected to the output shaft of the driving motor, the spline shaft (1) comprising a shaft body (11) and a plurality of spline teeth (12) arranged along the circumference of the shaft body (11), the spline teeth (12) having at least one wedge-shaped surface (121); A transmission shaft (2) is sleeved with a driving gear, the transmission shaft (2) is provided with a spline hole (21), the spline hole (21) comprises a connecting hole (211) and a limiting groove (212) arranged circumferentially along the hole wall of the connecting hole (211), the limiting groove (212) has at least one wedge-shaped groove wall (2121), the spline shaft (1) is inserted into the spline hole (21), the spline teeth (12) are located in the limiting groove (212), and the wedge-shaped groove wall (2121) is at least partially in contact with the wedge surface (121); The pushing structure (3) is used to push one of the transmission shaft (2) and the spline shaft (1) so as to always have a tendency to move toward the other.

2. The EMB service brake transmission system according to claim 1, characterized in that: The limiting groove (212) further comprises a straight groove wall (2122), the straight groove wall (2122) being arranged opposite to the wedge-shaped groove wall (2121), and the spline tooth (12) further comprises a straight surface (122), the straight surface (122) being arranged opposite to the wedge-shaped surface (121).

3. The EMB service brake transmission system according to claim 1, characterized in that: The invention also comprises a gearbox housing (4) and a gearbox end cover (5), wherein the gearbox end cover (5) is connected to the gearbox housing (4), one end of the transmission shaft (2) is rotatably connected to the gearbox end cover (5) via a first bearing (6), and the other end of the transmission shaft (2) is rotatably connected to the gearbox housing (4) via a second bearing (7), and the driving gear is located in a cavity formed by the gearbox end cover (5) and the gearbox housing (4).

4. The EMB service brake transmission system according to claim 3, characterized in that: A pushing structure (3) is provided between the gearbox end cover (5) and the first bearing (6), the pushing structure (3) being in contact with the gearbox end cover (5) and the first bearing (6) respectively, and the pushing structure (3) always has a tendency to push the first bearing (6) toward the drive motor.

5. The EMB service brake transmission system according to any one of claims 1 to 4, characterized in that: The pushing structure (3) comprises a wave spring.

6. The EMB service brake transmission system according to any one of claims 1 to 4, characterized in that: The pushing structure (3) comprises an elastic gasket.

7. The EMB service brake transmission system according to any one of claims 1 to 4, characterized in that: The number of the spline teeth (12) is no less than three.

8. The EMB service brake transmission system according to claim 7, characterized in that: The spline teeth (12) are evenly arranged along the circumference of the spline shaft (1).

9. The EMB service brake transmission system according to any one of claims 1 to 4, characterized in that: The wedge angle a of the wedge surface (121) is 5°-10°.

10. A vehicle, characterized in that: The invention comprises the EMB service brake transmission system according to any one of claims 1 to 9.

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