Electronic parking brake execution device

Abstract

The utility model discloses an electronic parking brake executing device which comprises a gear box body, a gear box cover, a motor, a first-stage transmission gear assembly, a second-stage transmission gear assembly, a planetary gear transmission assembly and an inner gear ring. The inner gear ring is located in a gear cavity of the gear box body and is in press fitting with the bottom, corresponding to the gear cavity, of the gear box body, a plurality of planet gears in the planet gear assembly are located in the inner gear ring and are meshed with the inner gear ring, and at least the inner tooth part of the inner gear ring is made of powder metallurgy or other metal materials. According to the utility model, the inner gear ring is designed as an independent part and then is fixed in the gear box body in a press-fitting manner, and the inner tooth part of the inner gear ring is made of powder metallurgy or other metal materials, so that the design scheme for manufacturing different parameters is met, the strength and the manufacturing precision of the inner gear ring can be improved, and the stability of meshing efficiency is improved; therefore, the range of adaptive torque can be expanded.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle brake technical field, especially electronic parking brake execution device. BACKGROUND

[0002] Electronic parking brake execution device includes motor and transmission mechanism, transmission mechanism reduces the output speed of motor and improves the output torque transmission to brake caliper and realizes parking function. Transmission mechanism can adopt multiple transmission modes, such as belt transmission mechanism, worm transmission mechanism, cylindrical gear transmission mechanism, planetary gear transmission mechanism etc. Compared with other transmission modes, planetary gear transmission mechanism has the advantages of high reduction ratio, compact structure and stable operation.

[0003] Among them, the inner tooth ring in the parking brake execution device is used for meshing with the planetary gear in the planetary transmission mechanism, and the existing inner tooth ring and gear box are formed by integral injection molding, so that the torque upper limit value borne by the inner tooth ring is lower, and the torque transmission requirement cannot be matched. UTILITY MODEL CONTENTS

[0004] The utility model discloses electronic parking brake execution device can improve the strength of inner gear and manufacturing precision, improve the stability of meshing efficiency, solve the problem that the torque transmission requirement cannot be matched.

[0005] According to the first aspect of the utility model embodiment, electronic parking brake execution device is provided, including:

[0006] Gear box, gear box includes motor accommodating cavity and gear chamber, gear chamber sets up at the front end of motor accommodating cavity and with motor accommodating cavity communication;

[0007] Gear box cover, cover in gear box and seal the gear chamber;

[0008] Motor, assemble in motor accommodating cavity, the output shaft of motor extends to gear chamber, and a first gear is fixed on the output shaft of motor;

[0009] Primary transmission gear assembly, including coaxial second gear and third gear, the second gear is engaged with the first gear;

[0010] Second transmission gear assembly, including coaxial fourth gear and sun gear, the fourth gear is engaged with the third gear;

[0011] The planetary gear transmission assembly comprises a planetary carrier, a plurality of planetary gears and an output spline, the plurality of planetary gears are assembled on a first end face of the planetary carrier, the output spline is assembled on a second end face of the planetary carrier, the first end face and the second end face are opposite two faces of the planetary carrier, a sun gear is located at a central position of the plurality of planetary gears and is engaged with the plurality of planetary gears respectively, and the output spline extends out along a bottom of the motor accommodating cavity.

[0012] An inner ring is located in the gear cavity and is press-fitted on the bottom of the gear cavity corresponding to the gear box body, and the plurality of planetary gears are located in the inner ring and are engaged with the inner ring respectively, and at least an inner tooth part of the inner ring is made of powder metallurgy or other similar metal materials.

[0013] The further improvement of the electronic parking brake execution device of the utility model lies in that the inner ring is made of powder metallurgy or other similar metal materials.

[0014] The further improvement of the electronic parking brake execution device of the utility model lies in that the gear box body is provided with an annular step in the region of the gear cavity corresponding to the secondary transmission gear assembly, and the inner ring is press-fitted on the annular step.

[0015] The further improvement of the electronic parking brake execution device of the utility model lies in that the inner ring is provided with a mounting part, and the annular step face is provided with a matching part; the inner ring is press-fitted in the gear cavity through the mounting part and the matching part.

[0016] The further improvement of the electronic parking brake execution device of the utility model lies in that the mounting part is at least two, the number of the matching part is the same as that of the mounting part and corresponds to the mounting part one by one.

[0017] The further improvement of the electronic parking brake execution device of the utility model lies in that the mounting part is a positioning column arranged on the inner ring, the positioning column extends out from a press-fitting face of the inner ring, the press-fitting face is an end face in the direction of the central axis of the inner ring, and the matching part is a positioning hole on the annular step face.

[0018] The further improvement of the electronic parking brake execution device of the utility model lies in that the positioning column partially exceeds the circumferential surface of the inner ring, and a recess part is arranged on the side face of the annular step to accommodate the positioning column exceeding part.

[0019] The further improvement of the electronic parking brake execution device of the utility model lies in that the mounting part is a positioning hole arranged on the inner ring, and the matching part is a positioning column arranged on the annular step face.

[0020] The further improvement of the electronic parking brake execution device is that the inner teeth of the inner gear ring do not exceed the two side end faces of the inner gear ring in the direction of the central axis of the inner gear ring.

[0021] The further improvement of the electronic parking brake execution device is that the central axis of the first gear wheel is parallel to the central axis of the planetary gear transmission assembly and the central axis of the secondary transmission gear assembly, and the central axis of the secondary transmission gear assembly coincides with the central axis of the planetary gear transmission assembly.

[0022] The electronic parking brake execution device provided by the utility model designs the inner gear ring as an independent component, then fixes the inner gear ring in the gear box body through press fitting, and makes the inner teeth of the inner gear ring from powder metallurgy or other similar metal materials, so that the design scheme of different parameters can be made, the strength and manufacturing precision of the inner gear ring can be improved, the stability of meshing efficiency can be improved, and the range of adaptive torque can be expanded. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model will be described in detail below by referring to the drawings and exemplary embodiments, in which:

[0024] Figure 1 An exploded view of the electronic parking brake execution device provided by an embodiment of the utility model is shown;

[0025] Figure 2 A sectional view of the electronic parking brake execution device provided by an embodiment of the utility model is shown;

[0026] Figure 3 A structural schematic view of the primary transmission gear assembly provided by an embodiment of the utility model is shown;

[0027] Figure 4 A structural schematic view of the secondary transmission gear assembly provided by an embodiment of the utility model is shown;

[0028] Figure 5 A structural schematic view of the planetary gear transmission assembly provided by an embodiment of the utility model is shown;

[0029] Figure 6 An assembly schematic view of the gear box body and the inner gear ring provided by an embodiment of the utility model is shown.

[0030] The drawings are merely schematic and not necessarily drawn to scale, and in addition, they only show those parts which are necessary for the elucidation of the utility model, while other parts can be omitted or merely simply mentioned. That is, the utility model can include other parts in addition to the parts shown in the drawings. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present application with specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. Although the description of the present application will be introduced in combination with the preferred embodiments, it does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0032] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] In the description of the present embodiment, it should be noted that the terms "upper", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the present application is used, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] The terms "first", "second", etc. are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present embodiment, it should also be noted that unless otherwise explicitly specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0036] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0037] Figure 1 An exploded view of an electronic parking brake execution device provided by an embodiment of the present application is shown; Figure 2A cross-sectional view of an electronic parking brake executing device provided by an embodiment of the present utility model is shown; Figure 3 A structure schematic view of a primary transmission gear assembly provided by an embodiment of the present utility model is shown; Figure 4 A structure schematic view of a secondary transmission gear assembly provided by an embodiment of the present utility model is shown; Figure 5 A structure schematic view of a planetary gear transmission assembly provided by an embodiment of the present utility model is shown.

[0038] Referring to Figures 1 to 5 The electronic parking brake executing device of the embodiment of the present utility model comprises a gear box body 10, a gear box cover 20, a motor 30, a primary transmission gear assembly 40, a secondary transmission gear assembly 50, a planetary gear transmission assembly 60 and an inner gear ring 13.

[0039] The gear box body 10 comprises a motor accommodating cavity 11 and a gear cavity 12, the gear cavity 12 is arranged at the front end of the motor accommodating cavity 11 and communicates with the motor accommodating cavity 11, and the gear cavity 12 is used for accommodating the primary transmission gear assembly 40, the secondary transmission gear assembly 50, the planetary gear transmission assembly 60 and the inner gear ring 13. Wherein, the front end of the motor accommodating cavity 11 is the end where the output shaft of the motor 30 is located. The gear box cover 20 is used for covering on the gear box body 10 and sealing the gear cavity 12.

[0040] The motor 30 is assembled in the motor accommodating cavity 11, the output shaft of the motor 30 extends into the gear cavity 12, and a first gear 31 is fixed on the output shaft of the motor 30, the first gear 31 is used for cooperating with the primary transmission gear assembly 40. The rear end of the motor accommodating cavity 11 is provided with a motor cover 32, the motor cover 32 is assembled at the rear end of the motor accommodating cavity 11 to seal the motor 30 in the motor accommodating cavity 11. A motor 30 wave spring 33 is further arranged between the motor cover 32 and the motor 30, and the motor 30 wave spring 33 is used for adjusting the axial gap of the motor 30.

[0041] The primary transmission gear assembly 40 comprises coaxially arranged second gear 41 and third gear 42, the second gear 41 is engaged with the first gear 31. In the embodiment of the present utility model, the diameter of the second gear 41 is greater than the diameter of the third gear 42, the center axis of the second gear 41 is provided with a first pin shaft 43, and the third gear 42 is assembled on the first pin shaft 43, so that the third gear 42 rotates synchronously with the second gear 41. The second gear 41, the first pin shaft 43 and the third gear 42 can be made by one-piece injection molding, the second gear 41 and the third gear 42 can also be fixed on the first pin shaft 43 by press fitting, or any one of the gears is injection molded with the first pin shaft 43 as the shaft, which is not specifically limited here.

[0042] The first pin shaft 43 extends out of the third gear 42 to be press-fitted with a positioning pin hole on the gear box 10, which is located at the bottom of the gear cavity 12. When the primary transmission gear assembly 40 is assembled, the third gear 42 is away from the gear cover 20 relative to the second gear 41. Through the meshing of the second gear 41 and the first gear 31, when the motor 30 drives the first gear 31 to rotate, the second gear 41 is synchronously driven to rotate, so that the primary transmission gear assembly 40 rotates.

[0043] The secondary transmission gear assembly 50 includes a fourth gear 51 coaxially arranged with a sun gear 52. The fourth gear 51 is meshed with the third gear 42 to be driven by the third gear 42 to rotate the secondary transmission gear assembly 50. The secondary transmission gear assembly 50 further includes a second pin shaft 53, and the fourth gear 51 and the sun gear 52 are fixed on the second pin shaft 53. The second pin shaft 53 extends out of the fourth gear 51 to be fitted with a shaft hole of the gear box cover 20. The diameter of the fourth gear 51 is greater than that of the sun gear 52. The fourth gear 51, the second pin shaft 53 and the sun gear 52 can be integrally injection molded. The fourth gear 51 and the sun gear 52 can also be fixed on the second pin shaft 53 by press-fitting, or any one of the gears is injection molded with the first pin shaft 43 as the shaft, which is not limited here.

[0044] In the embodiment, since the sun gear 52 is used to mesh with the planetary gear, a higher output torque is required, so the sun gear 52 is made of powder metallurgy or other similar metal materials. The fourth gear 51 can be injection molded with the second pin shaft 53 as the shaft, and the sun gear 52 is press-fitted on the second pin shaft 53.

[0045] The planetary gear transmission assembly 60 includes a planetary gear carrier 61, a plurality of planetary gears 62 and an output spline 63. The plurality of planetary gears 62 are assembled on a first end face 611 of the planetary gear carrier 61, and the output spline 63 is assembled on a second end face 612 of the planetary gear carrier 61. The first end face 611 and the second end face 612 are opposite faces of the planetary gear carrier 61. The sun gear 52 is located at the center of the plurality of planetary gears 62 and is meshed with the plurality of planetary gears 62, respectively. The output spline 63 extends out along the bottom of the motor accommodating cavity 11.

[0046] In the embodiment of the utility model, the planetary gear carrier 61 is a circular table structure, the planetary gear transmission assembly 60 includes four planetary gears 62, and the first end face 611 of the planetary gear carrier 61 is uniformly provided with four planetary gear shafts 64. The four planetary gears 62 are correspondingly assembled with the four planetary gear shafts 64, so that the four planetary gears 62 are rotatably assembled on the first end face 611 of the planetary gear carrier 61.

[0047] The planetary carrier 61, the four planetary shafts 64 and the output spline 63 are integrally injection molded. In another embodiment, the output spline 63 can be made of powder metallurgy or other metal-like materials, and then the planetary carrier 61 and the planetary shaft 64 are injection molded based on the output spline 63. The output spline 63 is located at the center of the planetary carrier 61, and specifically the central axis of the output spline 63 coincides with the central axis of the planetary carrier 61.

[0048] The inner ring gear 13 is arranged in the gear cavity 12, and the plurality of planetary gears 62 are arranged in the inner ring gear 13 and mesh with the inner ring gear 13 respectively. After the first-stage transmission gear assembly 40, the second-stage transmission gear assembly 50 and the planetary gear transmission assembly 60 are assembled, the sun gear 52 meshes with the four planetary gears 62 respectively to drive the four planetary gears 62 to revolve, and the four planetary gears 62 revolve by meshing with the inner ring gear 13, thereby driving the planetary carrier 61 to rotate.

[0049] After the first-stage transmission gear assembly 40, the second-stage transmission gear assembly 50 and the planetary gear transmission assembly 60 are assembled, the central axis of the first gear 31 is parallel to the central axis of the planetary gear transmission assembly 60 and the central axis of the second-stage transmission gear assembly 50, and the central axis of the second-stage transmission gear assembly 50 coincides with the central axis of the planetary gear transmission assembly 60. The transmission combination relationship of the utility model is that the second gear 41 meshes with the first gear 31, the fourth gear 51 meshes with the third gear 42, the sun gear 52 meshes with the four planetary gears 62, and the four planetary gears 62 mesh with the inner ring gear 13.

[0050] As shown in Figures 1 to 5 and shown in Figure 6 The inner ring gear 13 is arranged in the gear cavity 12 and is press-fitted with the bottom of the corresponding gear cavity 12 of the gear box 10, the plurality of planetary gears 62 are arranged in the inner ring gear 13 and mesh with the inner ring gear 13 respectively, and the plurality of planetary gears 62 revolve by meshing with the inner ring gear 13, thereby driving the planetary carrier 61 to rotate. The inner ring gear 13 is fixed in the gear box 10 by separate design and linear press-fitting, so that the inner ring gear 13 can be replaced according to requirements, including but not limited to material, structure and the like.

[0051] The conventional inner ring gear 13 is integrally injection molded with the gear box 10, so that the torque upper limit value borne by the inner ring gear 13 is low, which cannot meet the requirement of torque transmission. In the utility model, at least the inner tooth part of the inner ring gear 13 is made of powder metallurgy or other metal-like materials, thereby enhancing the output torque of the inner ring gear 13.

[0052] In an embodiment, the inner ring gear 13 is made of powder metallurgy or other similar metal materials, so as to improve the strength and manufacturing accuracy of the inner gear, further improve the output torque of the inner ring gear 13, and improve the NVH (Noise, Vibration, Harshness) performance of the product by improving the meshing accuracy between the inner ring gear 13 and the plurality of planetary gears 62. The inner ring gear 13 of the utility model can accurately adapt to different torque requirements by replacing powder metallurgy or metal materials of different strengths, thereby achieving improved economy.

[0053] In the center axis direction of the inner ring gear 13, the inner teeth of the inner ring gear 13 do not exceed the two side end faces of the inner ring gear 13. In the embodiment of the utility model, in the center axis direction of the inner ring gear 13, the size of the inner teeth of the inner ring gear 13 is equal to the size between the two side end faces of the inner ring gear 13, that is, the tooth width of the inner ring gear 13 is consistent with the thickness of the inner ring gear 13. Further, the inner ring gear 13 can also be designed and adjusted according to the number of teeth as required, so as to facilitate the production of different parameter design schemes without the need to open a new mold.

[0054] The gear box 10 is provided with an annular step 14 in the area of the gear cavity 12 corresponding to the secondary transmission gear assembly 50, that is, the secondary transmission gear assembly 50 is arranged above the annular step 14, and the inner ring gear 13 is press-fitted in the annular step 14, so as to fix the inner ring gear 13 in the gear box 10.

[0055] The inner ring gear 13 is provided with a mounting portion 131, and the annular step 14 is provided with a matching portion 121. The inner ring gear 13 is press-fitted in the gear cavity 12 by assembling the mounting portion 131 and the matching portion 121. In order to ensure the stability of the inner ring gear 13 and avoid twisting during transmission, the mounting portion 131 is at least two, and the number of the matching portion 121 is the same as and corresponds to the number of the mounting portion 131. In the drawings of the utility model, the mounting portion 131 is two, which are arranged on opposite sides of the inner ring gear 13. In other embodiments, the mounting portion 131 can also be multiple and uniformly arranged on the inner ring gear 13.

[0056] In an embodiment, as shown in Figure 6 The mounting portion 131 is a positioning column arranged on the inner ring gear 13, and the positioning column extends from the press-fitting surface of the inner ring gear 13. The press-fitting surface is an end face in the center axis direction of the inner ring gear 13, and the matching portion 121 is a positioning hole on the surface of the annular step 14. After the inner ring gear 13 is assembled, the press-fitting surface is in contact with the surface of the annular step 14. In addition, the other end face of the inner ring gear 13 opposite to the press-fitting surface is a reference surface for linear press-fitting. The inner ring gear 13 and the gear box 10 are assembled by interference fit as a whole, so as to ensure the stability of the inner ring gear 13.

[0057] Due to the space limitation of the gear cavity 12, the radial dimension of the inner ring gear 13 cannot be designed too large, but in order to further increase the reliability of the cavity fixation, the positioning column of the inner ring gear 13 is designed to partially exceed the peripheral surface of the inner ring gear 13, and correspondingly, the side surface of the annular step 14 is provided with a recess for accommodating the positioning column exceeding portion, thereby facilitating the positioning of the inner ring gear 13.

[0058] In yet another embodiment, not shown, the mounting portion 131 is a positioning hole provided on the inner ring gear 13, and the cooperating portion 121 is a positioning column provided on the surface of the annular step 14, so that the inner ring gear 13 is press-fitted in the gear box body 10 through the cooperation of the positioning column and the positioning hole.

[0059] The working principle of the utility model is as follows: the motor 30 drives the first gear 31 to rotate, the first gear 31 drives the second gear 41 to rotate through meshing, the second gear 41 drives the third gear 42 to rotate, the third gear 42 drives the fourth gear 51 to rotate through meshing, the fourth gear 51 drives the sun gear 52 to rotate, the sun gear 52 drives the four planetary gears 62 to rotate through meshing, the four planetary gears 62 rotate around the inner ring gear 13 to drive the planetary gear carrier 61 to rotate, the planetary gear carrier 61 drives the output spline 63 to rotate, and finally the power is output.

[0060] The electronic parking brake execution device provided by the utility model designs the inner ring gear as an independent component, which is then fixed in the gear box body through press fitting, and the inner tooth part of the inner ring gear is made of powder metallurgy or other metal materials, which meets the design scheme of different parameters, improves the strength and manufacturing precision of the inner ring gear, and improves the stability of the meshing efficiency, so that the range of the adapted torque can be expanded.

[0061] Although the utility model has been illustrated and described with reference to certain preferred embodiments, it should be understood by those skilled in the art that the above content is a further detailed description of the utility model in combination with specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. Those skilled in the art can make various changes in form and details, including making a number of simple inferences or substitutions, without departing from the spirit and scope of the utility model.

Claims

1. An electronic parking brake execution device characterized by comprising: The application relates to a gear box. The gear box comprises a gear box body, a gear box cover, a motor, a primary transmission gear assembly, a secondary transmission gear assembly and a planetary gear transmission assembly. The gear box body comprises a motor accommodating cavity and a gear cavity. The gear cavity is arranged at the front end of the motor accommodating cavity and communicates with the motor accommodating cavity. The gear box cover covers the gear box body and seals the gear cavity. The motor is assembled in the motor accommodating cavity. The output shaft of the motor extends into the gear cavity. A first gear is fixed on the output shaft of the motor.

2. The electronic parking brake execution device according to claim 1, characterized by The primary transmission gear assembly comprises coaxially arranged second and third gears.

3. The electronic parking brake execution device according to claim 1, characterized by The second gear is engaged with the first gear.

4. The electronic parking brake execution device according to claim 3, characterized by The secondary transmission gear assembly comprises coaxially arranged fourth and sun gears.

5. The electronic parking brake execution device according to claim 4, characterized by The fourth gear is engaged with the third gear.

6. The electronic parking brake execution device according to claim 5, characterized by The planetary gear transmission assembly comprises a planetary gear carrier, a plurality of planetary gears and an output spline.

7. The electronic parking brake execution device according to claim 6, characterized by The plurality of planetary gears are assembled on the first end face of the planetary gear carrier.

8. The electronic parking brake execution device according to claim 5, characterized by The output spline is assembled on the second end face of the planetary gear carrier.

9. The electronic parking brake execution device according to claim 1, characterized by The first end face and the second end face are opposite faces of the planetary gear carrier.

10. The electronic parking brake execution device according to claim 1, characterized by The sun gear is located at the center of the plurality of planetary gears and is engaged with the plurality of planetary gears. The output spline extends out along the bottom of the motor accommodating cavity. An inner ring is located in the gear cavity and is press-fitted on the bottom of the gear cavity corresponding to the gear box body. The plurality of planetary gears are located in the inner ring and are engaged with the inner ring. At least the inner tooth part of the inner ring is made of powder metallurgy or other similar metal materials. The inner ring is made of powder metallurgy or other similar metal materials. The gear box body is provided with an annular step in the region of the gear cavity corresponding to the secondary transmission gear assembly. The inner ring is press-fitted on the annular step. The inner ring is provided with a mounting part. The annular step face is provided with a matching part. The mounting part and the matching part are assembled to press-fit the inner ring in the gear cavity. The mounting part is at least two. The number of the matching part is the same as that of the mounting part and corresponds to the mounting part one by one. The mounting part is a positioning column arranged on the inner ring. The positioning column extends from the press-fitting face of the inner ring. The press-fitting face is an end face in the direction of the central axis of the inner ring. The matching part is a positioning hole arranged on the annular step face. In the direction of the central axis of the inner ring, the inner tooth of the inner ring does not exceed the two side end faces of the inner ring. The central axis of the first gear is parallel to the central axis of the planetary gear transmission assembly and the central axis of the secondary transmission gear assembly. The central axis of the secondary transmission gear assembly coincides with the central axis of the planetary gear transmission assembly.

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