A parking brake mechanism for an electric vehicle retarder

Abstract

The application discloses a parking brake mechanism for a pure electric vehicle speed reducer and relates to the technical field of parking devices in electric vehicle power transmission systems.The parking brake mechanism comprises a brake ratchet, a parking spring support, a parking brake shaft, a cam sector plate and a parking pawl shaft, the parking spring support is fixedly installed on the parking brake shaft, the parking brake mechanism can realize various parking brake states by using the difference of spring force, the brake mechanism can be converted from a pre-brake state to a brake state through compression of a buffer spring, the brake limiting part can fully absorb the vibration caused by the impact of the parking pawl when the parking pawl is clamped in the brake ratchet tooth groove, the buffer can also be used to protect the brake ratchet tooth groove, and the brake limiting part can effectively avoid wear and tear and the click sound between the pawl and the tooth groove when the brake is released.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of parking device in electric vehicle power transmission system, in particular to a parking brake mechanism for a reducer of a pure electric vehicle. BACKGROUND

[0002] When the pure electric vehicle is parked on the flat ground, the hand brake can be used to keep the vehicle stable on the road for a long time, but when the vehicle is parked on the slope, the braking burden of the hand brake is very large, and the spring and steel wire related to the brake will be deformed over time, and if the braking force is completely lost, it will cause the vehicle to roll, in order to reliably park the vehicle and prevent unnecessary rolling without using the hand brake, a pawl is arranged in the reducer to lock the gear on the output shaft to form a mechanical lock, thereby clamping the drive wheel shaft to fix the stationary or micro-motion vehicle, and we found in the continuous experiment process that the ordinary pawl will produce abnormal noise when it hits the tooth groove of the ratchet wheel during braking, which will have a certain impact on the reducer gear shaft, and the pawl and the tooth groove of the ratchet wheel will also occasionally produce clanking sound when the brake is released. SUMMARY

[0003] The purpose of the present application is to provide a parking brake mechanism for a reducer of a pure electric vehicle to solve the problems raised in the background.

[0004] In order to achieve the above purpose, the present application provides the following technical scheme: a parking brake mechanism for a reducer of a pure electric vehicle, comprising a brake ratchet, a parking spring support, a parking brake shaft, a cam sector plate and a parking pawl shaft, the parking spring support is fixedly installed on the parking brake shaft, the cam sector plate is rotatably installed on the parking brake shaft, a buffer spring is connected between the parking spring support and the cam sector plate, the brake ratchet is fixedly installed on the reducer gear shaft, the parking pawl shaft is fixedly installed with a parking pawl, the lower end of the parking pawl is fixedly connected with a brake limiting piece, the brake limiting piece comprises a limiting block, a rubber layer is arranged on the outer side of the limiting block, an inner cavity is arranged in the limiting block, an installation block is slidably and penetratively arranged at the left end of the limiting block, the installation block extends into the inner cavity, a latex body is fixedly connected to the left end face of the installation block, the latex body is fixedly connected between the latex body and the rubber layer, a support column is slidably and penetratively connected to the upper and lower ends of the limiting block, each support column extends into the inner cavity, a hard rubber block is fixedly connected to the outer end of each support column, and each hard rubber block is fixedly connected between the hard rubber block and the rubber layer.

[0005] As preferred, the parking pawl comprises a pawl handle and a hook part, a rectangular mounting column is fixedly arranged on the lower end surface of the pawl handle, a rectangular hole is arranged in the hook part, a roller mounting plate is arranged at the bottom position of the hook part, and a roller is rotatably arranged in the groove of the roller mounting plate.

[0006] As preferred, a threaded hole is arranged through the rectangular mounting column from front to back, and a fixing hole is arranged through the hook part from front to back, and the fixing hole passes through the rectangular hole in the hook part.

[0007] As preferred, the parking spring bracket and the cam sector plate are both provided with a triangular protrusion at the facing end, and the buffer spring is sleeved between the two triangular protrusions.

[0008] As preferred, the upper and lower end surfaces of the mounting block are both recessed and arranged in a slope shape, and a limiting slide plate is fixedly connected at the end of the mounting block, and the upper and lower ends of the limiting slide plate are slidably connected to the inner side wall of the inner cavity.

[0009] As preferred, each of the support columns is triangularly sloped at the end close to the limiting slide plate, and the angle of the slope is equal to that in the mounting block.

[0010] As preferred, the outer side end surfaces of the latex body and the hard rubber block are both circularly arc-shaped.

[0011] As preferred, a return spring is arranged on the parking pawl shaft, one end of the return spring is connected to the parking pawl, and the other end is connected to the reducer housing.

[0012] As preferred, a pawl handle is arranged at the right end of the pawl handle, a groove is arranged at the bottom surface of the pawl handle, and the connecting end of the return spring is embedded in the groove.

[0013] In summary, the present application has the following advantages:

[0014] The present application can not only realize various states of parking brake by using the difference of spring force, but also can convert the brake mechanism from pre-braking to braking state by compressing the buffer spring, and the brake limiting part can fully absorb the vibration caused by the impact of the parking pawl when it is clamped in the brake ratchet tooth groove, and can also buffer, effectively protecting the brake ratchet tooth groove, and when the brake is released, the brake limiting part is separated from the tooth groove, avoiding friction between the brake limiting part and the tooth groove side wall, effectively avoiding wear and tear, and also avoiding the click sound between the brake limiting part and the tooth groove when the brake is released. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

[0016] Figure 1 The overall structure of the parking brake mechanism for the pure electric vehicle decelerator according to the present application is shown in the figure.

[0017] Figure 2 The overall structure of the parking brake mechanism for the pure electric vehicle decelerator according to the present application is shown in the figure. Figure 1 The main view structure diagram of the middle part parking pawl 7 is shown in the figure.

[0018] Figure 3 The main view structure diagram of the middle part parking pawl 7 is shown in the figure. Figure 1 The main view structure diagram of the middle part brake limiting piece 10 is shown in the figure.

[0019] Figure 4 The main view structure diagram of the middle part brake limiting piece 10 is shown in the figure. Figure 1 The installation structure diagram of the middle part roller 5 is shown in the figure.

[0020] Figure 5 The installation structure diagram of the middle part roller 5 is shown in the figure. Figure 2 The top surface structure diagram of the middle part inner cavity 102 is shown in the figure.

[0021] The marks in the drawings are described as follows: parking spring support 1; buffer spring 2; parking brake shaft 3; cam sector plate 4; roller 5; return spring 6; parking pawl 7; brake ratchet 8; parking pawl shaft 9; brake limiting piece 10; decelerator tooth shaft 11; limiting block 101; inner cavity 102; rubber layer 103; hard rubber block 104; support column 105; latex body 106; mounting block 107; limiting slide 108; pawl handle part 701; hook part 702; rectangular mounting column 703; threaded hole 704; fixed hole 705; roller mounting plate 706. DETAILED DESCRIPTION

[0022] All features disclosed in this specification, or all steps of any method or process so disclosed, can be combined in any combination, except combinations where at least some of the features and / or steps are mutually exclusive.

[0023] Any feature disclosed in this specification, unless stated otherwise, can be replaced by alternative features serving the same, equivalent or similar purpose, to achieve the same, equivalent or similar result.

[0024] In the present application, unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of at least two elements or the interaction relationship of at least two elements, unless otherwise expressly limited. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0025] The following will be described in detail Figures 1-5 For the convenience of description, the following will be described in the following directions: the up-down-left-right-front-back directions in the following description are consistent with the directions of the front view of the device of the present application, Figure 1 The directions shown are consistent with the front-back-left-right-up-down directions of the front view of the device of the present application, Figure 1 The device of the present application is a front view, Figure 1 The directions shown are consistent with the front-back-left-right-up-down directions of the front view of the device of the present application.

[0026] Please refer to Figures 1-5 An embodiment provided by the present application: a parking brake mechanism for a pure electric vehicle reducer, comprising a brake ratchet wheel 8, a parking spring support 1, a parking brake shaft 3, a cam sector plate 4 and a parking pawl shaft 9, the parking spring support 1 is fixedly installed on the parking brake shaft 3, the cam sector plate 4 is rotatably installed on the parking brake shaft 3, the parking spring support 1 and the cam sector plate 4 are connected with a buffer spring 2, rotating the parking brake shaft 3 drives the parking spring support 1 to rotate, so that the parking spring support 1 drives the cam sector plate 4 to rotate through the buffer spring 2, and at the same time the buffer spring 2 has a certain pre-tightening force, the brake ratchet wheel 8 is fixedly installed on the reducer gear shaft 11, the parking pawl shaft 9 is fixedly installed with a parking pawl 7, the lower end of the parking pawl 7 is fixedly connected with a brake limiting piece 10, wherein the brake limiting piece 10 comprises a limiting block 101, the outer side of the limiting block 101 is covered with a rubber layer 103, the two ends of the rubber layer 103 are fixedly connected to the upper and lower end faces of the limiting block 101, and an inner cavity 102 is arranged in the limiting block 101, an installation block 107 is slidably and penetratingly arranged at the left end of the limiting block 101, the installation block 107 extends into the inner cavity 102, a latex body 106 is fixedly connected to the left end face of the installation block 107, the latex body 106 is fixedly connected between the rubber layer 103, and the upper and lower ends of the limiting block 101 are slidably and penetratingly connected with support columns 105, each of the support columns 105 extends into the inner cavity 102, and each of the support columns 105 is fixedly connected with a hard rubber block 104, and each of the hard rubber blocks 104 is fixedly connected between the rubber layer 103;

[0027] Because the hard rubber block 104 on the upper and lower sides is close to the fixed connection point of the rubber layer 103, the rubber layer 103 exerts a greater elastic force on the hard rubber block 104, thereby pressing the support column 105 into the inner cavity 102, pushing up the mounting block 107, and making the rubber body 106 support the rubber layer 103, further increasing the tension on both sides of the rubber layer 103, so that the pressure of the hard rubber block 104 is greater. When the brake limiter 10 is not abutted on the brake ratchet 8, the outer side of the brake limiter 10 is arched. When the parking pawl 7 moves and contacts the brake ratchet 8, the brake limiter 10 is clamped into the tooth groove of the brake ratchet 8. During the clamping process, the rubber body 106 first contacts the bottom surface of the tooth groove, so that the mounting block 107 is pressed into the inner cavity 102, the two support columns 105 are extended, and the two hard rubber blocks 104 are protruding and abut against the side wall of the tooth groove. Because the brake limiter 10 is pressed on the bottom surface of the tooth groove, the inner cavity 102 is relaxed, so that the hard rubber block 104 can protrude, and at the same time, the rubber body 106 is fully stressed, thereby deforming and spreading on the end surface of the limiting block 101, thereby fully absorbing the impact vibration of the parking pawl 7 when clamped in the tooth groove of the brake ratchet 8, and also buffering and effectively protecting the tooth groove of the brake ratchet 8. In addition, the rubber layer 103 on the surface greatly reduces wear and tear and thus improves the service life. When the brake is released, the rubber body 106 is first separated from the bottom surface of the tooth groove, and at this time the rubber layer 103 is re-tensioned at the position of the hard rubber block 104, the support column 105 is pressed back, and the hard rubber block 104 is retracted and separated from the side wall of the tooth groove. When the brake limiter 10 is separated from the tooth groove, the brake limiter 10 does not rub against the side wall of the tooth groove, effectively avoiding wear and tear, and also preventing the brake limiter 10 from clattering between the tooth groove when the brake is released.

[0028] It is worth mentioning that, in order to make the extension of the rubber body 106 and the hard rubber block 104 more smooth and stable during braking, the upper and lower end surfaces of the mounting block 107 are recessed and inclined in the embodiment, and a limiting slide 108 is fixedly connected to the end of the mounting block 107. The upper and lower ends of the limiting slide 108 are slidingly connected to the inner side wall of the inner cavity 102. Each support column 105 near the end of the limiting slide 108 is triangularly inclined, and the angle of the inclined surface is equal to that of the inclined surface in the mounting block 107.

[0029] It is also worth mentioning that the latex 106 and the hard rubber block 104 outside end face are arc-shaped, so that when it is abutted in the inside surface of the alveolar groove, the center area thickening buffering performance is better.

[0030] In addition, in one embodiment, the parking pawl 7 comprises a pawl handle 701 and a hook portion 702, the lower end surface of the pawl handle 701 is fixedly provided with a rectangular mounting column 703, the hook portion 702 is provided with a rectangular hole, the hook portion 702 is provided with a roller mounting plate 706 at the bottom position, the roller 5 is rotatably installed in the groove of the roller mounting plate 706, and the cam sector plate 4 is placed on the roller 5. The parking pawl 7 is arranged in a two-part structure, and the service life of the two parts is different, so that it can be replaced, thereby effectively avoiding waste. At the same time, the roller 5 and the cam sector plate 4 are in contact, which can reduce the friction between the cam sector plate 4 and the parking pawl 7 during movement, reduce the wear of the cam sector plate 4, and increase the service life.

[0031] In addition, in one embodiment, the rectangular mounting column 703 is provided with a threaded hole 704 through the front and rear, and the hook portion 702 is provided with a fixed hole 705 through the front and rear. The fixed hole 705 passes through the rectangular hole in the hook portion 702, so that the bolt passes through the fixed hole 705 and the threaded hole 704 to be fixedly connected, thereby ensuring stability.

[0032] It should be noted that, in order to make the contraction and release of the buffer spring 2 more stable, in the present embodiment, the parking spring bracket 1 and the cam sector plate 4 facing end are provided with triangular protrusions, and the buffer spring 2 is sleeved between the two triangular protrusions. When the parking brake shaft 3 rotates to drive the parking spring bracket 1 to rotate, the parking spring bracket 1 drives the cam sector plate 4 to rotate through the buffer spring 2, so that the contraction and release of the buffer spring 2 are more stable.

[0033] In addition, in one embodiment, the parking pawl shaft 9 is provided with a return spring 6, one end of the return spring 6 is connected to the parking pawl 7, and the other end is connected to the reducer housing. The pawl handle 701 is provided with a claw handle at the right end, and a groove is formed in the bottom surface of the claw handle, and the connecting end of the return spring 6 is embedded in the groove, so that the rebound of the return spring 6 makes the parking pawl 7 more stable, and the connecting end of the return spring 6 will not be out of position.

[0034] When braking, the rotating parking brake shaft 3 drives the parking spring bracket 1 to rotate, the parking spring bracket 1 drives the cam sector plate 4 to rotate through the buffer spring 2, the cam sector plate 4 rotates and touches the roller 5 on the parking pawl 7, thereby driving the parking pawl 7 to move, when the brake limiting piece 10 on the parking pawl 7 moves to contact the brake ratchet 8, if the brake limiting piece 10 just fits into the tooth groove of the brake ratchet 8, the brake limiting piece 10 can brake the brake ratchet 8, in the fitting process, the latex body 106 first contacts the bottom surface of the tooth groove, so that the mounting block 107 is pressed into the inner cavity 102, so that the two support columns 105 are stretched out, so that the two hard rubber blocks 104 protrude and abut on the side wall of the tooth groove, because the brake limiting piece 10 is pressed on the bottom surface of the tooth groove, the inner cavity 102 is relaxed, so that the hard rubber block 104 can protrude and abut on the side wall of the tooth groove, at the same time, the latex body 106 is fully stressed, so that it deforms and covers the end surface of the limiting block 101, thereby fully absorbing the impact vibration of the parking pawl 7 when it is fitted into the tooth groove of the brake ratchet 8, and also buffering, effectively protecting the tooth groove of the brake ratchet 8, and the rubber layer 103 on the surface greatly reduces wear and tear, thereby prolonging the service life; if the brake limiting piece 10 contacts the tooth top of the brake ratchet 8, with the rotation of the cam sector plate 4, the buffer spring 2 will store a part of the elastic force, when the brake ratchet 8 rotates to make the brake limiting piece 10 just fit into the tooth groove of the brake ratchet 8, the part of the elastic force can make the parking pawl 7 fit into the tooth groove of the brake ratchet 8, so that the parking pawl 7 can brake the brake ratchet 8, because the roller 5 is adopted on the parking pawl 7, when the cam sector plate 4 contacts the parking pawl 7, the friction between the two can be greatly reduced, thereby prolonging the service life; after the braking function is completed, the parking brake shaft 3 is rotated in the opposite direction, the parking spring bracket 1 is also rotated in the opposite direction, under the action of the return spring 6, the parking pawl 7 is rotated in the opposite direction, so that the parking pawl 7 is separated from the tooth groove of the brake ratchet 8, thereby achieving the effect of releasing the brake, when the brake is released, the latex body 106 is separated from the bottom surface of the tooth groove, at this time, the rubber layer 103 is tensioned again at the position of the hard rubber block 104, the support column 105 is pressed back, so that the hard rubber block 104 is retracted and separated from the side wall of the tooth groove, so that the brake limiting piece 10 does not rub with the side wall of the tooth groove when it is separated from the tooth groove, thereby effectively avoiding wear and tear, and also avoiding the click sound between the brake limiting piece 10 and the tooth groove when the brake is released.

[0035] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, any changes or replacements without creative labor should be covered in the protection scope of the application. Therefore, the protection scope of the application should be limited by the protection scope defined in the claims.

Claims

1. A parking brake mechanism for a pure electric vehicle reducer, comprising a brake ratchet (8), a parking spring bracket (1), a parking brake shaft (3), a cam sector plate (4), and a parking pawl shaft (9), characterized in that: The parking spring bracket (1) is fixedly mounted on the parking brake shaft (3), the cam sector plate (4) is rotatably mounted on the parking brake shaft (3), a buffer spring (2) is connected between the parking spring bracket (1) and the cam sector plate (4), the brake ratchet (8) is fixedly mounted on the reducer gear shaft (11), a parking pawl (7) is fixedly mounted on the parking pawl shaft (9), a brake limiting member (10) is fixedly connected to the lower end of the parking pawl (7), the brake limiting member (10) includes a limiting block (101), the outer side of the limiting block (101) is covered with a rubber layer (103), and an inner cavity (10) is provided in the limiting block (101). 2) A mounting block (107) is slidably provided through the left end of the limiting block (101). The mounting block (107) extends into the inner cavity (102). A latex body (106) is fixedly connected to the left end face of the mounting block (107). The latex body (106) is fixedly connected to the rubber layer (103). Support columns (105) are slidably connected through the upper and lower ends of the limiting block (101). Each support column (105) extends into the inner cavity (102). A hard rubber block (104) is fixedly connected to the outer end of each support column (105). Each hard rubber block (104) is fixedly connected to the rubber layer (103).

2. The parking brake mechanism for a pure electric vehicle reducer according to claim 1, characterized in that: The parking pawl (7) includes a pawl handle (701) and a hook pawl (702). A rectangular mounting post (703) is fixedly provided on the lower end face of the pawl handle (701). A rectangular hole is provided in the hook pawl (702). A roller mounting plate (706) is provided at the bottom position of the hook pawl (702). A roller (5) is rotatably mounted in the groove of the roller mounting plate (706).

3. A parking brake mechanism for a pure electric vehicle reducer according to claim 2, characterized in that: The rectangular mounting post (703) has a threaded hole (704) that runs through the front and back, and the claw part (702) has a fixing hole (705) that runs through the front and back, and the fixing hole (705) passes through the rectangular hole in the claw part (702).

4. A parking brake mechanism for a pure electric vehicle reducer according to claim 2, characterized in that: The parking spring bracket (1) and the cam sector plate (4) are both provided with triangular protrusions on their facing ends, and the buffer spring (2) is sleeved between the two triangular protrusions.

5. A parking brake mechanism for a pure electric vehicle reducer according to claim 2, characterized in that: The upper and lower end faces of the mounting block (107) are both recessed and inclined, and a limiting slide (108) is fixedly connected to the end of the mounting block (107). The upper and lower ends of the limiting slide (108) are slidably connected to the inner wall of the inner cavity (102).

6. A parking brake mechanism for a pure electric vehicle reducer according to claim 5, characterized in that: Each of the support columns (105) has a triangular bevel near the end of the limiting slide (108), and the bevel angle is equal to that of the bevel in the mounting block (107).

7. A parking brake mechanism for a pure electric vehicle reducer according to claim 2, characterized in that: Both the latex (106) and the outer end face of the hard rubber block (104) are arc-shaped.

8. A parking brake mechanism for a pure electric vehicle reducer according to claim 2, characterized in that: A return spring (6) is installed on the parking pawl shaft (9). One end of the return spring (6) is connected to the parking pawl (7), and the other end is connected to the reducer housing.

9. A parking brake mechanism for a pure electric vehicle reducer according to claim 8, characterized in that: The right end of the pawl handle (701) is provided with a pawl handle, and a groove is provided on the bottom surface of the pawl handle, into which the connecting end of the return spring (6) is embedded.

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