A motor drive assembly, an anti-lock braking device, and a vehicle

Abstract

The utility model relates to mechanical drive technical field more specifically, it relates to a kind of motor drive assembly, anti-lock braking device and vehicle, including cavity and the motor being set on cavity, push-pull block and pre-compression spring, push-pull block does linear reciprocating motion in cavity along first direction and second direction, the resistance of push-pull block along first direction movement is greater than the resistance along second direction movement, pre-compression spring is connected between push-pull block and cavity, pre-compression spring respectively along first direction pressure relief and along second direction pressure storage, motor is connected with push-pull block and is used to drive push-pull block, a kind of motor drive assembly of the utility model can reduce the output force requirement of motor, effectively reduce the volume of motor.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, and in particular to a motor transmission component, an anti-lock braking device, and a vehicle. Background Technology

[0002] Currently, some vehicles use a motor-driven block reciprocating motion within their braking system to perform active, high-frequency intermittent braking when braking is close to lock-up, in order to achieve an anti-lock braking effect. When the anti-lock braking effect is activated, the block may have to deal with high oil pressure in one direction, which requires the motor to have a large output power. This necessitates the use of a larger motor for driving, which is not conducive to optimizing the space of the anti-lock braking system. Utility Model Content

[0003] To address the problems existing in the prior art, this application provides a motor drive assembly, an anti-lock braking device, and a vehicle.

[0004] In a first aspect, this utility model provides a motor drive assembly, which adopts the following technical solution:

[0005] A motor drive assembly includes a cavity and a motor, a push-pull block, and a pre-compression elastic element disposed on the cavity. The push-pull block reciprocates linearly within the cavity along a first direction and a second direction. The resistance to the push-pull block's movement along the first direction is greater than the resistance to its movement along the second direction. The pre-compression elastic element is connected between the push-pull block and the cavity. The pre-compression elastic element releases pressure along the first direction and stores pressure along the second direction. The motor is connected to the push-pull block and is used to drive the push-pull block.

[0006] Preferably, the motor is disposed outside the cavity.

[0007] Preferably, the motor is connected to the push-pull block via a crank, and the push-pull block has an oblong hole for connecting one end of the crank, the length direction of the oblong hole being perpendicular to the moving direction of the push-pull block.

[0008] Preferably, the cavity is provided with a bevel gear set, which includes a first bevel gear and a second bevel gear that mesh with each other. The first bevel gear is connected to the motor, and the second bevel gear is connected to the push-pull block.

[0009] Preferably, the first bevel gear is a pinion and the second bevel gear is a large gear.

[0010] Preferably, the preloaded elastic element is a preloaded spring.

[0011] Preferably, an installation space for installing the preload spring is formed between the two sides of the push-pull block and the cavity, and two preload springs are connected between the push-pull block and the cavity.

[0012] Secondly, this utility model provides an anti-lock braking device, which adopts the following technical solution:

[0013] An anti-lock braking device employs the aforementioned motor drive assembly.

[0014] Preferably, the cavity is filled with brake fluid, and the push-pull block moves against the oil pressure within the cavity.

[0015] Thirdly, this utility model provides a vehicle, which adopts the following technical solution:

[0016] A vehicle including the aforementioned anti-lock braking system.

[0017] The beneficial effects of this utility model are as follows:

[0018] When the push-pull block moves in the first direction, the preload spring can be released, which helps the drive component to compress the space of the first volume cavity, thereby reducing the output force requirement of the drive component and ultimately effectively reducing the volume of the drive component. Attached Figure Description

[0019] Figure 1 This is a perspective view of the volume adjustment section in an embodiment of this application;

[0020] Figure 2 This is a perspective view of the volume adjustment unit in an embodiment of this application from another angle;

[0021] Figure 3 This is a top view of the volume adjustment section in an embodiment of this application;

[0022] Figure 4 This is a cross-sectional view of the volume adjustment section along line AA in an embodiment of this application;

[0023] Figure 5 This is a cross-sectional view of the cavity in an embodiment of this application;

[0024] Figure 6 This is a cross-sectional view of the first piston in an embodiment of this application;

[0025] Figure 7 This is a cross-sectional view of the plunger in an embodiment of this application;

[0026] Figure 8 This is a perspective view of the push-pull block in the embodiments of this application;

[0027] Figure 9 This is a side view of the volume adjustment section in an embodiment of this application;

[0028] Figure 10 This is a BB-direction cross-sectional view of the volume adjustment section in an embodiment of this application;

[0029] Figure 11 This is a schematic diagram of the transmission between the motor and the push-pull block in an embodiment of this application;

[0030] Figure 12 This is a cross-sectional view of the first piston and push-pull block in the other embodiments;

[0031] Figure 13 This is a cross-sectional view of the volume adjustment section along line AA in the second embodiment;

[0032] Figure 14 This is a cross-sectional view of the volume adjustment section along line AA in the third embodiment.

[0033] Explanation of reference numerals in the attached drawings: 1. Cavity; 11. First volumetric cavity; 12. Second volumetric cavity; 13. First oil port; 14. Second oil port; 2. First piston; 21. Oil passage; 211. Narrow passage; 212. Conical passage; 213. Wide passage; 22. Slider; 3. Push-pull block; 31. Slide groove; 32. Waist-shaped hole; 4. 41. Control rod; 42. Pushing part; 43. Pulling part; 44. Arc-shaped groove; 5. Pressure relief chamber; 51. Second piston; 52. Energy storage spring; 6. Plunger; 61. Arc-shaped protrusion; 62. Plug head; 63. Nut; 64. Return spring; 7. Preload spring; 8. Motor; 91. First bevel gear; 92. Second bevel gear; 93. Crank; 101. Ratchet; 102. Pawl; 103. Torsion spring. Detailed Implementation

[0034] The following will combine Figures 1-12 The present invention will be further described in conjunction with the embodiments.

[0035] This embodiment discloses a motor drive assembly used in a volume adjustment section, an anti-lock braking device, and a vehicle.

[0036] Reference Figures 1 to 8The volume adjustment unit includes a cavity 1, a first piston 2, a push-pull block 3, and a driving component. The cavity 1 has a volume chamber; the first piston 2 is slidably disposed within the cavity 1, with its outer wall slidably sealing against the inner wall of the cavity 1. The volume chambers at both ends of the first piston 2 are a first volume chamber 11 and a second volume chamber 12, respectively. The first piston 2 has an oil passage 21. The push-pull block 3 is movably disposed within the second volume chamber 12, with a gap between the push-pull block 3 and the second volume chamber 12 for brake fluid flow. The push-pull block 3 slides in the same direction as the first piston 2 and is movably connected to it. The driving component connects to the push-pull block 3 and provides driving force to it. The movement of the push-pull block 3 includes movement in a first direction and movement in a second direction. When the push-pull block 3 moves in the first direction, it first blocks the oil passage 21 and then pushes the first piston 2. When the push-pull block 3 moves in the second direction, it first releases the oil passage 21 and then pulls the first piston 2.

[0037] The anti-lock braking system (ABS) includes a volume adjustment unit, a brake trigger, and a brake actuator. The brake trigger is connected to the first volume chamber 11 of the volume adjustment unit via a first oil port 13; the brake actuator is connected to the second volume chamber 12 of the volume adjustment unit via a second oil port 14; brake fluid is filled between the brake trigger, the volume adjustment unit, and the brake actuator. The brake trigger can be in the form of a brake pedal, a brake lever, or an electronic brake, while the brake actuator can be in the form of a brake caliper or a brake wheel cylinder.

[0038] The vehicle includes a vehicle body, wheel speed sensors, a controller, and an anti-lock braking system. The vehicle body includes a frame and wheels mounted on the frame. The wheel speed sensors are used to detect the wheel speeds. The controller is connected to the wheel speed sensors and calculates the vehicle's slip ratio based on the wheel speeds. The anti-lock braking system is mounted on the frame, and its drive mechanism is connected to the controller. If the slip ratio exceeds a threshold, the drive mechanism controls the push-pull block 3 to slide back and forth.

[0039] The anti-lock braking system (ABS) principle of the volume adjustment unit, anti-lock braking device, and vehicle in this embodiment is as follows: When the wheel is in a critical lock-up state, the drive component controls the push-pull block 3 to slide back and forth. When the push-pull block 3 moves in the first direction, as it blocks the oil passage 21 and pushes the first piston 2, the volume of the second volume chamber 12 increases, thereby reducing the pressure on the brake actuator. When the push-pull block 3 moves in the second direction, as it releases the oil passage 21 and pulls the first piston 2, the oil pressure balance between the first volume chamber 11 and the second volume chamber 12 is restored, thereby reducing the back pressure on the brake actuator. Finally, with the reciprocating sliding of the push-pull block 3, high-frequency intermittent braking is achieved, thus achieving the anti-lock effect. Furthermore, compared to the prior art, since the pressure reduction of the brake actuator is accompanied by the blocking of the oil passage 21, the resistance at the brake trigger does not decrease synchronously with the pressure reduction of the brake actuator, preventing the driver from subconsciously applying further braking and ensuring the anti-lock effect.

[0040] Reference Figure 4 and Figure 10 It also includes a pressure relief chamber 5 and a plunger 6. The pressure relief chamber 5 is connected to the first volume chamber 11. The plunger 6 is disposed in the first volume chamber 11 and faces the entrance of the pressure relief chamber 5. The plunger 6 is used to open and close the pressure relief chamber 5. The opening and closing state of the pressure relief chamber 5 is opposite to the opening and closing state of the oil passage 21. Compared with the prior art, the advantages of the present invention are as follows: as the push-pull block 3 pushes the first piston 2, the oil pressure in the first volume chamber 11 will increase because the oil passage 21 has been blocked. At this time, the opening of the pressure relief chamber 5 can relieve the oil pressure in the first volume chamber 11, avoiding the generation of a large braking rebound force at the brake trigger, thereby avoiding the defect of poor brake feel. Afterwards, as the push-pull block 3 pulls the first piston 2, the oil passage 21 has been released again, so the first volume chamber 11 no longer has a need for pressure relief. At this time, the closing of the pressure relief chamber 5 can allow the oil pressure to be directly transmitted to the brake actuator during normal braking, avoiding the problem of the oil pressure being transmitted to the pressure relief chamber 5 first, resulting in a long braking stroke.

[0041] Reference Figures 4 to 8The push-pull block 3 is linked to the plunger 6, and the push-pull block 3 controls the plunger 6 to open and close the inlet of the pressure relief chamber 5. Specifically, the end of the push-pull block 3 is connected to a control rod 41, which axially passes through the oil passage 21 of the first piston 2. The diameter of the control rod 41 is smaller than the diameter of the oil passage 21, so that brake fluid can pass through the gap between the control rod 41 and the oil passage 21. The control rod 41 intersects the plunger 6 perpendicularly. The plunger 6 has a through hole through which the control rod 41 passes. The side wall of the through hole is provided with an arc-shaped groove 44 and an arc-shaped protrusion 61. One end of the plunger 6 is a plug head 62, and the other end is connected to the inner wall of the first volume chamber 11 with a return spring 64. When the pressure relief chamber 5 is closed, the plug head 62, the arc-shaped groove 44, the arc-shaped protrusion 61, and the return spring 64 are arranged along the axial direction of the plunger 6, and the arc-shaped protrusion 61 is embedded in the arc-shaped groove 44. With this configuration, as the push-pull block 3 pushes the first piston 2, the arc-shaped protrusion 61 is pushed away from the arc-shaped groove 44 of the control rod 41, causing the plunger head 62 of the plunger 6 to open the pressure relief chamber 5, while the return spring 64 is compressed. As the push-pull block 3 pulls the first piston 2, the arc-shaped protrusion 61 aligns with the arc-shaped groove 44 again, and the restoring force of the return spring 64 causes the arc-shaped protrusion 61 to re-embed into the arc-shaped groove 44, thus causing the plunger head 62 of the plunger 6 to close the pressure relief chamber 5 again. Ultimately, this achieves the process of the plunger 6 opening and closing the pressure relief chamber 5 as the push-pull block 3 moves.

[0042] It should be noted that the diameter of the through hole of the plunger 6 must be larger than the diameter of the control rod 41 to ensure that the arc-shaped protrusion 61 can be pushed out when the control rod 61 moves upward.

[0043] Reference Figure 13 In other embodiments, the control lever 41 may also be located at the end of the first piston 2, thereby realizing the process of the plunger 6 opening and closing the pressure relief chamber 5 as the first piston 2 moves. It should be noted that after the control lever 41 is located at the end of the first piston 2, there needs to be a channel for brake fluid to enter and exit between the control lever 41 and the first piston 2. Additionally, refer to... Figure 14 In other embodiments, the plunger 6 can also be controlled by an electrical control unit disposed in the cavity 1. The electrical control unit is connected to the drive unit by signal, so as to realize the process of the plunger 6 opening and closing the pressure relief chamber 5 as the electrical control unit moves.

[0044] Reference Figure 6 The oil passage 21 is axially formed between the two ends of the first piston 2, allowing brake fluid to flow between the two ends of the first piston 2 when the oil passage 21 is opened, thus smoothly transmitting the pressure of the brake trigger to the brake actuator and achieving braking. In other embodiments, such as... Figure 12 As shown, the oil passage 21 can be opened at one end on the end face of the first piston 2 and at the other end on the side of the first piston 2.

[0045] Reference Figure 6 The cross-section of the oil passage 21 is circular. The oil passage 21 is divided into a narrow passage 211, a tapered passage 212 and a wide passage 213 along the axial direction. The diameter of the narrow passage 211 is smaller than the diameter of the wide passage 213. The diameter of the tapered passage 212 gradually increases from the edge of the narrow passage 211 to the edge of the wide passage 213.

[0046] Reference Figures 4 to 8 The push-pull block 3 includes a pushing part 42 and a pulling part 43. The pushing part 42 has a front abutting surface for abutting against the first piston 2, and the pulling part 43 has a rear abutting surface for abutting against the first piston 2. The first piston 2 is telescopically connected between the front abutting surface and the rear abutting surface. The front abutting surface is also used to block the oil passage 21. In this embodiment, the end of the pulling part 43 is provided with a mounting groove. The pushing part 42 is fixedly connected to the bottom of the mounting groove. The pushing part 42 is movably inserted into the oil passage 21 of the first piston 2, and the pulling part 43 is movably engaged with the outer wall of the first piston 2. Specifically, the diameter of the pushing part 42 is between the diameters of the narrow channel 211 and the wide channel 213 of the oil passage 21, so that the pushing part 42 is located between the tapered channel 212 and the wide channel 213 of the oil passage 21, and the front abutment surface is formed between the inner end of the pushing part 42 and the tapered channel 212 of the oil passage 21, thereby realizing the insertion of the pushing part 42 into the oil passage 21 of the first piston 2, and realizing the effect of the front abutment surface sealing the oil passage 21. The mounting groove sidewall of the pulling part 43 is provided with two opposing sliding grooves 31, and the outer wall of the first piston 2 is correspondingly provided with two sliders 22. The two sliders 22 are slidably disposed in the two sliding grooves 31, realizing the movable engagement between the pulling part 43 and the outer wall of the first piston 2. In summary, as the push-pull block 3 moves in the first direction, the pushing part 42 blocks the oil passage 21, and then the pushing part 42 pushes the first piston 2 to compress the first volume chamber 11; while as the push-pull block 3 moves in the second direction, the pushing part 42 releases the oil passage 21, and then the pulling part 43 pulls the first piston 2 to reset, thereby completing the control of the first piston 2 by the push-pull block 3.

[0047] Reference Figure 12 In other embodiments, the pulling part 43 may also be provided on the outer wall of the pushing part 42 and together with it inside the first piston 2, so as to push and pull the first piston 2 inside the first piston 2 and control the opening and closing of the oil passage 21.

[0048] Reference Figure 9 and Figure 10A second piston 51 is installed inside the pressure relief chamber 5. The second piston 51 is slidably and sealed within the pressure relief chamber 5. An energy storage spring 52 is axially connected between the side of the second piston 51 facing away from the first volume chamber 11 and the end face of the pressure relief chamber 5. As the push-pull block 3 blocks the oil passage 21 and pushes the first piston 2, the pressure relief chamber 5 is opened. The oil pressure in the first volume chamber 11 can force the second piston 51 to move inward, causing the energy storage spring 52 to be compressed, thus releasing pressure and effectively reducing the braking rebound force generated at the brake trigger when ABS is activated. Subsequently, as the push-pull block 3 releases the oil passage 21 and pulls the second piston 51, the pressure accumulated in the energy storage spring 52 can discharge part of the brake fluid in the pressure relief chamber 5 until the pressure relief chamber 5 is blocked, ensuring that the brake pressure can be smoothly transmitted to the brake actuator.

[0049] In other embodiments, an elastic sheet is provided inside the pressure relief chamber 5. The elastic sheet is sealed to the side wall of the pressure relief chamber 5. When the pressure relief chamber 5 is opened, the elastic sheet is deformed by pressure, thereby realizing the pressure relief of the first volume chamber 11. Before the pressure relief chamber 5 is closed, the restoring force of the elastic sheet will discharge part of the oil in the pressure relief chamber 5 until the pressure relief chamber 5 is sealed.

[0050] Reference Figure 4 and Figure 7 In this embodiment, the inlet of the pressure relief chamber 5 is funnel-shaped, and the plug 62 of the plunger 6 is ball-shaped. A gap exists between the plunger 6 and the first volume chamber 11 to facilitate the flow of brake fluid through the plunger 6. A threaded hole extending into the volume chamber is provided on the outer wall of the cavity 1, and a nut 63 is threadedly connected to the threaded hole. The nut 63 is coaxial with the plunger 6, and a return spring 64 is disposed between the plunger 6 and the nut 63. By adjusting the position of the nut 63, the preload of the return spring 64 can be quickly adjusted. A first limiting groove and a second limiting groove are respectively provided between the two opposite ends of the nut 63 and the plunger 6. The two ends of the return spring 64 fall into the first limiting groove and the second limiting groove respectively, improving the positional stability of the return spring 64.

[0051] Reference Figure 4 and Figure 5A preload spring 7 is connected between the push-pull block 3 and the bottom of the second volume cavity 12 along the sliding direction. The preload spring 7 assists the push-pull block 3 in pushing the first piston 2. Specifically, cylindrical mounting spaces for installing the preload spring 7 are formed between the two sides of the push-pull block 3 and the second volume cavity 12. After installation, the preload spring 7 deforms along the sliding direction of the push-pull block 3. When the push-pull block 3 moves in the second direction, since the first volume cavity 11 and the second volume cavity 12 are connected, the driving component can preload the preload spring 7 with a lower driving force. When the push-pull block 3 moves in the first direction, the preload spring 7 can be released, allowing the driving component to drive the push-pull block 3 to compress the space of the first volume cavity 11, thereby reducing the output force requirement of the driving component and ultimately effectively reducing the volume of the driving component.

[0052] Reference Figure 2 , Figure 8 and Figure 11 The driving component is a motor 8. Specifically, a bevel gear set is provided on the outer side of the cavity 1. The bevel gear set includes a first bevel gear 91 and a second bevel gear 92 that mesh with each other. The first bevel gear 91 is a small gear, and the second bevel gear 92 is a large gear. The output shaft of the motor 8 is coaxially and fixedly connected to the first bevel gear 91. The push-pull block 3 is connected to the second bevel gear 92 through a crank 93. One end of the crank 93 is coaxially and fixedly connected to the second bevel gear 92, and the other end is movably connected to the push-pull block 3, so that the power of the motor 8 is transmitted to the push-pull block 3 sequentially through the bevel gear set and the crank 93. In addition, in order to avoid transmission jamming, the push-pull block 3 is also provided with an oblong hole 32. The length direction of the oblong hole 32 is perpendicular to the sliding direction of the push-pull block 3, and one end of the crank 93 is movably connected in the oblong hole 32 of the push-pull block 3.

[0053] Reference Figure 11 A reversing positioning mechanism is provided between the second bevel gear 92 and the cavity 1. The reversing positioning mechanism includes a ratchet 101, a pawl 102, and a torsion spring 103. The ratchet 101 is coaxially and fixedly connected to the second bevel gear 92. In this embodiment, the second bevel gear 92 is connected to the crank 93 through the ratchet 101, while the pawl 102 is rotatably disposed in the cavity 1. The pawl 102 is connected to the torsion spring 103, and the torsion spring 103 causes the pawl 102 to press against the ratchet 101. The jammed state of the ratchet 101 and the pawl 102 corresponds to the open state of the oil passage 21. Based on the above settings, when the second bevel gear 92 drives the crank 93 to rotate forward, the pawl 102 is continuously pushed open by the ratchet 101, ensuring that the push-pull block 3 can continuously slide back and forth to achieve the anti-lock braking effect through high-frequency intermittent braking. When the second bevel gear 92 drives the crank 93 to rotate in reverse, the pawl 102 will lock the ratchet 101, ensuring that after the ABS state ends, the push-pull block 3 can accurately return to the position that opens the oil passage 21, avoiding affecting subsequent normal braking operations.

[0054] Reference Figure 4 , Figure 6 and Figure 8 It should be noted that, based on the structural design of this solution, even if the push-pull block 3 accidentally stops at the position where the push part 42 blocks the oil passage 21 due to reasons such as motor 8 failure, the first piston 2 is movable upwards at this time, and the sealing capacity between the conical channel 212 and the push part 42 is limited. Therefore, the brake oil pressure applied by the brake trigger can push the first piston 2 upwards, thereby ensuring that the oil passage 21 can still be opened, avoiding the situation where the brake cannot be applied due to motor 8 failure. Furthermore, in this embodiment, the inner end of the push part 42 is a rounded end, so that the seal between the conical channel 212 and the push part 42 is a line abutment seal structure. The line seal can effectively increase the area and force of the first piston 2 being pushed upwards in the blocked state, so that the upward area and force of the first piston 2 in the blocked state are greater than its downward area and force, ensuring that the first piston 2 can be pushed open by the brake oil pressure in abnormal conditions.

[0055] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A motor drive assembly, characterized in that, The device includes a cavity (1) and a motor (8), a push-pull block (3), and a pre-pressure elastic element disposed on the cavity (1). The push-pull block (3) reciprocates linearly in the cavity (1) along a first direction and a second direction. The resistance of the push-pull block (3) moving along the first direction is greater than the resistance of moving along the second direction. The pre-pressure elastic element is connected between the push-pull block (3) and the cavity (1). The pre-pressure elastic element releases pressure along the first direction and stores pressure along the second direction. The motor (8) is connected to the push-pull block (3) and is used to drive the push-pull block (3).

2. The motor drive assembly according to claim 1, characterized in that: The motor (8) is located outside the cavity (1).

3. The motor drive assembly according to claim 2, characterized in that: The motor (8) is connected to the push-pull block (3) via a crank (93). The push-pull block (3) has a waist-shaped hole (32) for connecting one end of the crank (93). The length direction of the waist-shaped hole (32) is perpendicular to the movement direction of the push-pull block (3).

4. The motor drive assembly according to claim 3, characterized in that: The cavity (1) is provided with a bevel gear set, which includes a first bevel gear (91) and a second bevel gear (92) that mesh with each other. The first bevel gear (91) is connected to the motor (8), and the second bevel gear (92) is connected to the push-pull block (3).

5. A motor drive assembly according to claim 4, characterized in that: The first bevel gear (91) is a pinion, and the second bevel gear (92) is a large gear.

6. The motor drive assembly according to claim 1, characterized in that: The preloaded elastic element is a preloaded spring (7).

7. A motor drive assembly according to claim 6, characterized in that: The push-pull block (3) has an installation space between its two sides and the cavity (1) for installing the preload spring (7), and two preload springs (7) are connected between the push-pull block (3) and the cavity (1).

8. An anti-lock braking device, characterized in that: The motor drive assembly as described in any one of claims 1-7 is used.

9. The anti-lock braking device according to claim 8, characterized in that: The cavity (1) is filled with brake fluid, and the push-pull block (3) moves against the oil pressure inside the cavity (1).

10. A vehicle, characterized in that: The anti-lock braking device as described in claim 9 is used.

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