CN113389823B

CN113389823B - Electronic parking device

Info

Publication number: CN113389823B
Application number: CN202010170473.1A
Authority: CN
Inventors: 喻润湘
Original assignee: Kwang Yang Motor Co Ltd
Current assignee: Kwang Yang Motor Co Ltd
Priority date: 2020-03-12
Filing date: 2020-03-12
Publication date: 2023-02-10
Anticipated expiration: 2040-03-12
Also published as: CN113389823A

Abstract

The invention provides an electronic parking device, which comprises a motor, a reduction gear unit, a pushing unit and a brake caliper. The reduction gear unit includes a driving gear, a first gear set, a second gear set, and an output gear. The pushing unit includes: the adjusting screw rod is driven by the output gear to rotate; and an adjusting nut screwed with the adjusting screw via a screw thread part and driven by the adjusting screw to move. This brake caliper includes: a caliper body having a cylinder hole; the piston is arranged in the cylinder hole and can be pushed by the adjusting nut; and two brake shoes capable of being pushed by the piston to clamp the brake disc.

Description

Electronic parking device

Technical Field

The present invention relates to a parking device, and more particularly, to an electronic parking device.

Background

The patent publication No. CN104806668a of the people's republic of china discloses an actuator of an Electric Parking Brake (EPB) system, which adopts a planetary gear train, so that the assembly is convenient, and the actuator has higher bearing capacity and better stability. However, the conventional electric parking brake system described above employs a planetary gear train, so that the number of parts is large, which results in an increase in size of the entire electric parking brake system, and is disadvantageous for miniaturization. Therefore, a solution is necessary.

Disclosure of Invention

[ problems to be solved by the invention ]

Therefore, an object of the present invention is to provide an electronic parking device.

[ means for solving problems ]

Accordingly, the electronic parking device of claim 1 is adapted to clamp a brake disc to achieve a parking effect, and includes a motor, a reduction gear unit, a pushing unit, and a brake caliper. The reduction gear unit includes: a driving gear driven by the motor; the first gear set is provided with a first large gear driven by the driving gear and a first small gear which coaxially rotates with the first large gear and has a diameter smaller than that of the first large gear; the second gear set is arranged in a reverse direction with the first gear set and is provided with a second bull gear driven by the first pinion of the first gear set and a second pinion which coaxially rotates with the second bull gear and has a diameter smaller than that of the second bull gear; and an output gear driven by the second pinion of the second gear set. The pushing unit includes: an adjusting screw rod driven by the output gear to rotate; and an adjusting nut, which is screwed with the adjusting screw via a thread part and is driven by the adjusting screw to move. This brake caliper includes: a caliper body having a cylinder hole; a piston, which is arranged in the cylinder hole and can be pushed by the adjusting nut; and two brake lining sheets capable of being pushed by the piston to clamp the brake disc.

In the electronic parking device of claim 2, the first pinion and the brake disc of the first gear set are located on opposite sides of the first gearwheel of the first gear set.

In the electronic parking device according to claim 3 of the present invention, the screw portion is a trapezoidal screw.

The electronic parking device of claim 4 further comprises a fixing bracket disposed on the brake caliper and including at least one fixing screw hole.

In the electronic parking device of claim 5 of the present invention, the reduction gear unit further includes a gear housing accommodating the driving gear, the first gear set, the second gear set and the output gear, the first gear set and the second gear set are disposed between the driving gear and the output gear, and the driving gear, the first gear set, the second gear set and the output gear are substantially arranged along an arc line, so that the gear housing forms an invagination space facing the center of the brake disc, wherein the fixing screw hole of the fixing frame is disposed between the gear housing and the center of the brake disc and is adjacent to the invagination space.

In the electronic parking device according to claim 6 of the present invention, the fixing frame further includes an accommodating portion having an L-shaped cross section and defining an accommodating space, and a portion of the motor is disposed in the accommodating space.

In the electronic parking device of claim 7, the piston of the brake caliper has a pushing wall for pushing one of the brake pads, and a surrounding wall extending from the pushing wall in a direction away from the brake pads, the pushing wall and the surrounding wall together define a receiving space for receiving the adjusting screw and the adjusting nut and communicating with the cylinder hole, wherein the adjusting nut is used for clamping the brake disc by the brake pads by pushing the pushing wall of the piston.

The electronic parking device in the 8 th aspect of the present invention is further adapted to use brake fluid for braking, wherein the caliper body further has a brake fluid channel communicated with the cylinder hole and the accommodating space, and the brake fluid is injected into the accommodating space through the brake fluid channel to push the piston and the brake pads, so that the brake pads clamp the brake disc.

In the electronic parking device according to claim 9 of the present invention, the motor, the reduction gear unit, and the pushing unit are assembled to the brake caliper.

[ Effect of the invention ]

The invention has the effects of the technology 1: the reduction gear unit only forms 2 layers of gear contact surfaces, the distance between the reduction gear unit and the brake disc can be shortened, the electronic parking device is beneficial to miniaturization, and the pushing unit only needs to use the adjusting screw rod and the adjusting nut, so the effect of less parts can be achieved, and the miniaturization of the whole electronic parking device is more beneficial.

The invention has the effects of the technology of item 2: the first small gear and the second large gear are disposed outward, so that the arrangement of the motor and the brake caliper is not easily interfered.

The effects of the invention by the technique of item 3 are: the trapezoidal thread of the thread part can provide enough friction force, so that the adjusting screw rod and the adjusting nut can be automatically maintained in a locked state without relative movement, and the motorcycle can still be automatically maintained in an electronic parking state.

The invention by the technique of item 4 has the following effects: the motor, the reduction gear unit, the pushing unit and the brake caliper are arranged by the fixing frame, and the fixing frame is installed on the motorcycle by the fixing screw hole.

The invention has the effects of the technology of the 5 th item: the fixing frame is mounted to the motorcycle by the fixing screw hole adjacent to the invagination space of the gear housing, thereby achieving the effect of further reducing the volume of the electronic parking device.

The effects of the invention by the technique of item 6 are: by arranging a part of the motor in the accommodating space of the accommodating part of the fixing frame, the effect of further reducing the volume of the electronic parking device can be achieved.

The invention has the effects of the technology of item 7: the accommodating space of the piston is used for accommodating the adjusting screw and the adjusting nut, and the adjusting nut pushes the pushing wall of the piston to enable the brake lining to clamp the brake disc.

The invention has the effects of the technology of item 8: the hydraulic brake and the electronic parking share the same brake caliper body and the same piston, so that the cost is saved, and the occupied space is reduced.

Drawings

Other features and effects of the present invention will become apparent from the following detailed description of the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a side view illustrating an embodiment of the electronic parking device of the present invention, which is adapted to clamp a brake disc for parking;

FIG. 2 is a bottom view illustrating the electronic parking device and the brake disc in the embodiment;

fig. 3 is a partial sectional view illustrating the electronic parking device;

fig. 4 is a side view illustrating the electronic parking device; and

FIG. 5 is a partial cross-sectional view illustrating the hydraulic brake and the electric parking sharing a brake caliper body and a piston in this embodiment to save cost and reduce space.

List of reference numerals

1. Motor

2. Reduction gear unit

20. Gear housing

201. Invagination space

21. Driving gear

22. First gear set

221. First gearwheel

222. First pinion

23. Second gear set

231 · second gearwheel

232. Second pinion

24. Output gear

3. Pushing unit

30. Screw part

31. Adjusting screw

32. Adjusting nut

4. Brake caliper

40. Caliper body

401 cylinder bore

402. Brake fluid channel

41. Piston

412 push wall

413. Surrounding wall

414. Accommodation space

42 brake lining

43. Brake lining

5. Mounting bracket

51. Fixed screw hole

52. Accommodation part

53. Accommodating space

9. Brake disc

C. Arc.

Detailed Description

Referring to fig. 1 to 5, the embodiment of the electronic parking device of the present invention is adapted to clamp a brake disc 9 for parking and also adapted to brake with brake fluid. In this embodiment, the electronic parking device includes a motor 1, a reduction gear unit 2, a pushing unit 3, a brake caliper 4, and a fixing frame 5, wherein the motor 1, the reduction gear unit 2, and the pushing unit 3 are assembled on the brake caliper 4.

In the present embodiment, the reduction gear unit 2 includes a gear housing 20, a driving gear 21, a first gear set 22, a second gear set 23, and an output gear 24. The gear housing 20 houses the driving gear 21, the first gear set 22, the second gear set 23, and the output gear 24, wherein the driving gear 21 can be driven by the motor 1.

The first gear set 22 has a first gearwheel 221 driven by the driving gear 21, and a first pinion 222 rotating coaxially with the first gearwheel 221 and having a diameter smaller than that of the first gearwheel 221. As shown in fig. 2, in the present embodiment, the brake disc 9 and the first pinion gear 222 are located on opposite sides of the first gearwheel 221.

The second gear set 23 has a second large gear 231 driven by the first small gear 222 of the first gear set 22, and a second small gear 232 rotating coaxially with the second large gear 231 and having a diameter smaller than that of the second large gear 231. In the present embodiment, the second gear set 23 and the first gear set 22 are disposed in opposite directions, that is, in the case that the brake disc 9 and the first pinion 222 are disposed on opposite sides of the first gearwheel 221, the second gearwheel 231 and the brake disc 9 are disposed on opposite sides of the second pinion 232, that is, the first pinion 222 and the second gearwheel 231 are disposed outward, so that the arrangement of the motor 1 and the brake caliper 4 is not easily interfered.

Compared with the patent publication No. CN104806668a, the reduction gear unit 2 of the electronic parking device of the present invention does not use a planetary gear train, so that the number of parts is small, and the electronic parking device is advantageous for miniaturization. In addition, since the second gear set 23 and the first gear set 22 are disposed in opposite directions, only 2 layers of gear contact surfaces are formed in the reduction gear unit 2, so that the distance between the reduction gear unit 2 and the brake disc 9 can be shortened, which is more beneficial to the miniaturization of the electronic parking apparatus of the present invention.

In the present embodiment, the output gear 24 is driven by the second pinion 232 of the second gear set 23.

As shown in fig. 1 and 4, the first gear set 22 and the second gear set 23 are disposed between the driving gear 21 and the output gear 24, and the driving gear 21, the first gear set 22, the second gear set 23 and the output gear 24 are arranged along an arc C, so that the gear housing 20 forms an inward space 201 facing the center of the brake disc 9.

As shown in fig. 1 and 3, the fixing frame 5 is used for installing the brake caliper 4, and includes at least one fixing screw hole 51 and an accommodating portion 52. In the present embodiment, the fixing screw hole 51 is located between the gear housing 20 and the center of the brake disc 9 and is adjacent to the recessed space 201 of the gear housing 20. In the present embodiment, since the fixing screw hole 51 adjacent to the recessed space 201 of the gear housing 20 is used to mount the fixing bracket 5 to a motorcycle (not shown), the effect of reducing the volume of the electronic parking apparatus of the present invention can also be achieved.

In the present embodiment, the cross section of the accommodating portion 52 is generally L-shaped and defines an accommodating space 53, wherein a part of the motor 1 is disposed in the accommodating space 53, so as to further achieve the effect of reducing the volume of the electronic parking apparatus of the present invention.

As shown in fig. 3, the pushing unit 3 includes an adjusting screw 31 and an adjusting nut 32. The adjusting screw 31 can be driven by the output gear 24 to rotate. The adjusting nut 32 and the adjusting screw 31 are screwed by a thread portion 30 and are driven by the adjusting screw 31 to move, wherein in the present embodiment, the thread portion 30 is a trapezoidal thread to provide a large enough friction force to achieve a Lock effect, so that there is no relative movement between the adjusting screw 31 and the adjusting nut 32 after the motor 1 is powered off.

In the embodiment, since the pushing unit 3 only needs to use the adjusting screw 31 and the adjusting nut 32, the effect of fewer parts can be achieved, which is more beneficial to the miniaturization of the whole electronic parking device.

As shown in fig. 2, 3 and 5, the brake caliper 4 includes a caliper body 40, a piston 41, and two spaced

brake pads

42 and 43. The caliper body 40 has a cylinder hole 401, and a brake fluid passage 402 communicating with the cylinder hole 401.

The piston 41 is disposed in the cylinder bore 401 and can be pushed by the adjusting nut 32. In this embodiment, the piston 41 has a pushing wall 412 for pushing the brake shoes 42, and a surrounding wall 413 extending from the pushing wall 412 in a direction away from the

brake shoes

42 and 43, wherein the pushing wall 412 and the surrounding wall 413 together define a receiving space 414 for receiving the adjusting screw 31 and the adjusting nut 32 and communicating with the cylinder hole 401.

The brake fluid passage 402 is in communication with the cylinder bore 401 and the accommodating space 414.

The

brake shoes

42, 43 can be pushed by the piston 41 to clamp the brake disc 9, so that the electronic parking device of the present invention can achieve the electronic parking function or the hydraulic braking function.

As shown in fig. 2 and 3, when the motorcycle rider wants to electronically park, the motor 1 is turned forward to rotate the reduction gear unit 2, so as to rotate the adjusting screw 31 to push the adjusting nut 32, and then push the piston 41 forward by pushing the pushing wall 412 of the piston 41, so that the

brake pads

42 and 43 can be pushed by the piston 41, and the

brake pads

42 and 43 can clamp the brake disc 9. Conversely, the motorcycle rider can also reverse the motor 1 to move the adjustment nut 32 backwards to release the piston 41 so that the

brake shoes

42, 43 no longer brake the brake disc 9. Furthermore, if the motor 1 is powered off under the condition that the brake discs 9 are clamped by the

brake shoes

42 and 43, the screw portion 30 is a trapezoidal thread to provide a sufficient friction force path, so that the Lock state without relative movement is automatically maintained between the adjusting screw 31 and the adjusting nut 31, so that the motorcycle can still be automatically maintained in the electronic parking state.

As shown in fig. 2 and 5, or when the motorcycle rider wants to perform hydraulic braking, the brake device (not shown) is operated to inject brake fluid into the accommodating space 414 through the brake fluid passage 402 to push the piston 41, so as to drive the

brake pads

42 and 43, so that the

brake pads

42 and 43 clamp the brake disc 9.

In summary, the electronic parking device of the present invention has the following main advantages and effects: the reduction gear unit 2 only forms 2 layers of gear contact surfaces, the distance between the reduction gear unit 2 and the brake disc 9 can be shortened, which is beneficial to the miniaturization of the electronic parking device of the invention, and the pushing unit 3 only needs to use the adjusting screw 31 and the adjusting nut 32, so the effect of less parts can be achieved, the miniaturization of the whole electronic parking device is more beneficial, and the aim of the invention can be really achieved.

The above description is only an example of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made according to the claims and the contents of the specification should be included in the scope covered by the present invention.

Claims

1. An electronic parking device adapted to clamp a brake disc to achieve a parking effect, comprising:

a motor;

a reduction gear unit comprising:

a driving gear driven by the motor;

the first gear set is provided with a first gearwheel driven by the driving gear and a first pinion which coaxially rotates with the first gearwheel and has a diameter smaller than that of the first gearwheel;

the second gear set is arranged in a reverse direction to the first gear set and is provided with a second large gear driven by the first small gear of the first gear set and a second small gear which coaxially rotates with the second large gear and has a diameter smaller than that of the second large gear;

an output gear driven by the second pinion of the second gear set; and

a gear housing accommodating the driving gear, the first gear set, the second gear set and the output gear, the first gear set and the second gear set being between the driving gear and the output gear, and the driving gear, the first gear set, the second gear set and the output gear being arranged substantially along an arc such that the gear housing forms an invagination space facing the center of the brake disc;

a pushing unit comprising:

the adjusting screw is driven by the output gear to rotate; and

the adjusting nut is in threaded connection with the adjusting screw rod through a threaded part and is driven by the adjusting screw rod to move;

a brake caliper, comprising:

a caliper body having a cylinder hole;

the piston is arranged in the cylinder hole and can be pushed by the adjusting nut; and

the brake disc is driven by the piston to clamp the brake disc; and

a brake caliper, comprising:

a caliper body having a cylinder hole;

the brake disc is driven by the piston to clamp the brake disc; the fixing frame is arranged on the brake caliper and comprises at least one fixing screw hole;

wherein the fixing screw hole of the fixing frame is located between the gear housing and the center of the brake disc and is adjacent to the recessed space.

2. The electronic parking device of claim 1 wherein the first pinion gear and the brake disc of the first gear set are on opposite sides of the first bull gear of the first gear set.

3. The electronic parking device according to claim 1, wherein the threaded portion is a trapezoidal thread.

4. The electronic parking device of claim 1 wherein the fixing bracket further comprises a receiving portion having a generally L-shaped cross section and defining a receiving space, a portion of the motor being disposed in the receiving space.

5. The electronic parking device according to claim 1, wherein the piston of the brake caliper has a pushing wall for pushing one of the brake pads, and a surrounding wall extending from the pushing wall in a direction away from the brake pad, the pushing wall and the surrounding wall together defining a receiving space for receiving the adjusting screw and the adjusting nut and communicating with the cylinder hole, wherein the adjusting nut causes the brake pad to clamp the brake disc by pushing the pushing wall of the piston.

6. The electronic parking device according to claim 5, further adapted to brake by using a brake fluid, wherein the caliper body further has a brake fluid passage communicating with the cylinder hole and the accommodating space, and the brake fluid is injected into the accommodating space through the brake fluid passage to push the piston and the brake pad, so that the brake pad clamps the brake disc.

7. The electronic parking device according to claim 1, wherein the motor, the reduction gear unit, and the pushing unit are assembled on the brake caliper.