CN210034233U - Clearance adjustable disk caliper and central parking arresting gear - Google Patents
Clearance adjustable disk caliper and central parking arresting gear Download PDFInfo
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- CN210034233U CN210034233U CN201920400383.XU CN201920400383U CN210034233U CN 210034233 U CN210034233 U CN 210034233U CN 201920400383 U CN201920400383 U CN 201920400383U CN 210034233 U CN210034233 U CN 210034233U
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Abstract
The utility model relates to an automobile parts technical field specifically indicates a clearance adjustable disc calliper and central parking arresting gear. The device comprises a shell, a push rod penetrating through the shell, a piston fixed at the end part of the push rod and a rotary ball transmission structure arranged in the shell and used for driving the push rod to move axially; the piston is in an annular structure spirally connected to the end part of the push rod, and a plurality of adjusting holes arranged at intervals are formed in the end face of the outer side of the circumference of the piston. The utility model discloses the adjustment mode of piston is simple high-efficient, need not to introduce other adjusting device or equipment, can the accurate control piston precession or the length of screw-out, the friction clearance of accurate control clutch blocks.
Description
Technical Field
The utility model relates to an automobile parts technical field specifically indicates a clearance adjustable disc calliper and central parking arresting gear.
Background
In a compact chassis of an off-road vehicle, the design of the central parking brake has been a difficult point. On one hand, the arrangement of parts such as a parking brake, a parking air chamber and the like is required to be completed in a limited space; on the other hand, as the self weight of the off-road vehicle is larger and the running condition is bad, the parking brake needs to provide a large parking braking force so as to meet the condition that the vehicle is parked in a large slope in the field; at the same time, stringent reliability requirements need to be met. During the long-term use of the brake, the clearance between the friction block and the brake disc is gradually increased due to the friction consumption of the friction block, and if the clearance cannot be eliminated, the problem of braking can be caused. Currently, there are many solutions for such gap adjustment.
For example, a gap adjusting structure is introduced in the chinese patent with the patent number "CN 201110189168.8" entitled "gap self-adjusting mechanism in an automobile air pressure disc brake", the air pressure disc brake includes a seat body, a push rod and a cam, the gap self-adjusting mechanism is arranged on the seat body and located between the push rod and the cam, the gap self-adjusting mechanism includes a bracket and an adjuster component arranged on the bracket, the push rod passes through the bracket, the adjuster component is located on the side portion of the push rod, a solenoid is sleeved on the push rod, the solenoid is connected with the push rod through a thread, the outer side surface of the solenoid has a ring gear, the adjuster component has a transmission gear, the transmission gear is engaged with the ring gear on the outer side surface of the solenoid, the cam has a shifting pin, and the adjuster component can be shifted through the shifting pin to enable the transmission. The device sets up the adjuster subassembly on the support, makes the adjuster subassembly form an independent module, makes clearance self-modulation mechanism realize the modularization production, has improved the efficiency of production and assembly. The adjuster assembly inner bushing and the transmission gear are in linkage relation, and can slip mutually when the torque between the inner bushing and the transmission gear is too large, so that the inner bushing and the transmission gear are prevented from being seized mutually, the adjuster assembly has a self-protection function, and the stability of the adjuster assembly is improved. However, the structure is relatively complex, a new part module needs to be additionally arranged, the existing structure is greatly improved, the existing part structure cannot be utilized for adjustment and improvement, and the cost and the manufacturing difficulty of automobile parts are invisibly increased.
Disclosure of Invention
The utility model aims at solving the above-mentioned background art not enough, provide a clearance adjustable disk calliper and central parking arresting gear.
The technical scheme of the utility model is that: a clearance adjustable disc caliper characterized by: the device comprises a shell, a push rod penetrating through the shell, a piston fixed at the end part of the push rod and a rotary ball transmission structure arranged in the shell and used for driving the push rod to move axially; the piston is connected to one end of the push rod through threads, and a plurality of adjusting holes which are arranged at intervals are formed in the end face of the outer side of the circumference of the piston.
And furthermore, a plurality of straight end faces which are uniformly distributed along the circumferential direction of the piston are arranged on the circumferential end face of one side of the piston, which faces the friction block, and each straight end face is provided with an adjusting hole.
Furthermore, at least one first limiting groove is formed in the end face of the outer side of the circumference of the piston; the first limiting groove is a U-shaped groove which is arranged along the axial direction of the piston and is provided with an opening at one end; the shell is provided with a first limit pin which can extend into the first limit groove to limit the rotation of the piston in a penetrating mode.
And a first resetting structure which resets the piston and the push rod when the parking is cancelled is arranged between the piston and the push rod.
The first reset structure further comprises a spring seat arranged on the push rod in a penetrating way; and a return spring is arranged between the spring seat and the push rod.
A second limit groove which is arranged along the axial direction is further formed on the circumferential end face of the push rod; the shell is provided with a second limiting pin which can extend into the second limiting groove to limit the push rod to rotate in a penetrating mode.
The rotating ball transmission structure further comprises an ejector rod arranged in the shell in a penetrating mode and a plurality of steel balls arranged at the end portion of the ejector rod; the end part of the ejector rod is provided with a ball groove for accommodating a steel ball; the ball groove is an arc groove with variable depth; one end of the steel ball can be connected with the ball groove in a rolling way, and the other end of the steel ball is propped against one end of the push rod far away from the piston.
The utility model provides a central authorities parking arresting gear with disc calliper which characterized in that: the brake comprises a brake air chamber, a small bracket, a friction block bracket and a caliper bracket; the brake air chamber is fixed on the shell and is in transmission connection with the rocker arm on the shell; one end of the rotary ball transmission structure is in transmission connection with the rocker arm, and the other end of the rotary ball transmission structure is in transmission connection with the push rod and is used for converting the rotary motion of the rocker arm into the axial linear motion of the push rod; the friction block bracket is fixed on the shell and is respectively arranged on the two axial sides of the brake disc with the piston; the shell can be connected to the caliper bracket in a manner of moving along the axial direction of the piston; and a second reset structure is arranged between the caliper bracket and the shell.
The second reset structure comprises a return spring which is respectively fixed on the air chamber bracket and the small bracket.
The utility model has the advantages that: 1. the adjusting holes are formed in the circumferential end face of the piston, so that the position between the piston and the push rod can be adjusted conveniently when the friction clearance changes, the piston can be screwed simply and conveniently, the adjusting process can be completed without special equipment or tools, the angle can be accurately adjusted by equally dividing the adjusting holes, and the screwing-in or screwing-out length of the piston can be accurately controlled;
2. the limiting structure is arranged between the piston and the shell, so that the axial rotation of the piston is controlled, the friction block friction gap change caused by the rotation of the piston in the use process is avoided, and the position of the piston on the push rod is strictly controlled;
3. the reset structure is arranged between the push rod and the piston, so that the push rod and the piston can be enabled to be quickly restored to the initial state when parking is relieved, meanwhile, the friction effect on a brake disc is relieved by the friction block positioned on one side of the piston, the reaction is quick, and the dragging and rubbing phenomenon is avoided;
4. through setting up reset structure at little support and air chamber support to and the limit structure who sets up between casing and the calliper support, can guarantee to make the clutch blocks that are located clutch blocks support one side reply to initial condition rapidly when removing the parking, remove the friction to the brake disc, avoid owing to remove untimely dragging and rubbing, guaranteed that the degree of friction of two clutch blocks is in the unanimity all the time.
5. The parking brake can be arranged at the input end of the axle main reducer, can also be arranged at the input/output shaft of the transfer case, and can be additionally provided with a plurality of sets of parking brakes according to the attachment condition of the whole vehicle.
The utility model discloses simple structure, the simple high efficiency of the regulation mode of piston need not to introduce other adjusting device or equipment, can the accurate control piston precession or the length of screw-out, and the friction clearance of accurate control clutch blocks has very big spreading value.
Drawings
FIG. 1: the utility model discloses a front view of the installation of the braking device;
FIG. 2: the explosion schematic diagram of the braking device of the utility model;
FIG. 3: the utility model discloses a front view of a caliper assembly;
FIG. 4: the utility model discloses a rear view of a caliper assembly;
FIG. 5: the explosion schematic diagram of the caliper assembly of the utility model;
FIG. 6: the utility model discloses a cutting structure diagram of a caliper assembly;
wherein: 1-a caliper bracket; 2, a brake disc; 3, a friction block; 4, a shell; 5, a brake air chamber; 6, a rocker arm; 7, a mandril; 8, a push rod; 9-a piston; 10-a friction block support; 11-an adjustment hole; 12-a first limit groove; 13-a first limit pin; 14-spring seat; 15-a return spring; 16-a clamp spring; 17-a second limiting groove; 18-a second limit pin; 19-steel balls; 20-ball groove; 21, sliding sleeve; 22-sliding pin; 23-a small support; 24-air chamber support; 25-a return spring; 26-main reducer; 27-a cage.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments.
According to the embodiment, the device comprises a caliper assembly and a caliper support 1, wherein the caliper support 1 is used for positioning and connecting the caliper assembly and a friction block 3, a guide groove is formed in the caliper support 1, the friction block 3 can be connected to the guide groove along the axial direction of a brake disc 2 in a moving mode, and the caliper assembly drives the two friction blocks 3 to be attached to the brake disc 2 in a moving mode along the axial direction of the brake disc 2 to generate a braking effect when in use. As shown in fig. 1, the caliper bracket 1 is fixed to the final drive 26 by a bolt structure.
As shown in fig. 2 to 6, the caliper assembly of the present embodiment includes a housing 4, an air chamber bracket 24 for fixedly connecting with a brake air chamber 5 is disposed on the housing 4, and the brake of the present embodiment mainly provides power output through the brake air chamber 5, and is an air brake device. The shell 4 is provided with a rocker arm 6, the rocker arm 6 is fixedly connected with an air chamber bracket 24, and the brake air chamber 5 drives the rocker arm 6 to rotate around the axis of the movable disk 2.
The housing 4 of the present embodiment is provided with a mechanism for converting the rotational motion of the rocker arm 6 into linear motion in the axial direction of the brake disk 2. As shown in fig. 5 to 6, a push rod 7 is disposed on the housing 4 of the present embodiment, the push rod 7 is connected to the rocker arm 6 and driven by the rocker arm to rotate around the axis of the driving disk 2, one end of the push rod 7 penetrates through the housing 4 to be fixedly connected with the rocker arm 6, and the other end of the push rod 7 is connected to a push rod 8 through a rotary ball transmission structure.
As shown in fig. 5 to 6, the push rod 8 is a bolt structure with a large end and a small end, a rotary ball transmission structure is arranged between the large end and the push rod 7, and the small end is connected with a piston 9 for pushing the friction block 3 to move axially. The rotary ball transmission structure of the embodiment is a transmission structure for converting the rotary motion of the ejector rod 7 into the axial linear motion of the push rod 8, and comprises at least one steel ball 19 and a retainer 27 for limiting the steel ball 19, wherein the end part of the ejector rod 7 is provided with a ball groove 20 for accommodating the steel ball 19, the ball groove 20 is an arc-shaped groove with depth change, one end of the steel ball 19 is connected to the ball groove 20 in a rolling manner, and the other end of the steel ball 19 abuts against one end of the big end of the push rod 8. When the ejector rod 7 rotates, the steel ball 19 rotates in the ball groove 20, and due to different depths of the ball groove 20, when the ejector rod rotates from the groove depth to the groove depth, the steel ball 19 pushes the push rod 8 to enable the push rod 8 to move axially along the brake disc 2.
In this embodiment, in order to limit the movement of the push rod 8 except the axial direction, a limiting structure is provided on the housing 4, as shown in fig. 5 to 6, a second limiting groove 17 arranged along the axial direction is provided on the circumferential end surface of the large head end of the push rod 8, and a second limiting pin 18 capable of extending into the second limiting groove 17 to limit the rotation of the push rod 8 is provided on the housing 4 in a penetrating manner. The second stopper pin 18 is engaged with the second stopper groove 17, and the push rod 8 can move only in the axial direction of the brake disk 2 and cannot rotate.
The push rod 8 transmits axial linear motion to the piston 9, so that the piston 9 pushes the friction block 3 to be attached to the brake disc 2 along the axial movement, as shown in fig. 5-6, the piston 9 of the embodiment is of a hollow ring sleeve type structure, one end of the piston is connected to one end of a small end of the push rod 8 through an internal thread structure in a spiral mode, the other end of the piston is connected with the friction block 3, a plurality of flat end faces which are uniformly distributed are arranged on the circumferential end face of one side of the piston 9 facing the friction block 3, and each flat end face is provided with an adjusting hole 11. The 9 position hexagonal structures of piston of this embodiment, including six straight terminal surfaces, set up an adjusting hole 11 on every straight terminal surface, divide six adjusting hole 11 equally promptly on the piston 9, through rotating the length that adjusting hole 11 can accurate control piston 9 precession or screw-out to adjust the friction clearance of clutch blocks 3, avoid because long-time back of using, the malfunctioning problem of braking takes place appears in the clearance increase that clutch blocks 3 leads to because wearing and tearing.
In order to avoid the piston 9 to rotate in the using process, the embodiment is provided with the bolt limiting structure on the housing 4, as shown in fig. 5 to 6, at least one first limiting groove 12 is provided on the circumferential end surface of one side of the piston 9 departing from the friction block 3, the first limiting groove 12 is a U-shaped groove which is arranged along the axial direction of the brake disc 2 and has an open end, and the housing 4 is provided with a first limiting pin 13 which can extend into the first limiting groove 12 to limit the rotation of the piston 9. The first limiting groove 12 of this embodiment is provided with 6, with adjusting hole 11 one-to-one, can set up to rotate the back that targets in place as an adjusting hole 11, can fix whole piston 9 through wear to establish a first spacer pin 13 to the first limiting groove 12 that corresponds, restriction piston 9's rotary motion.
As shown in fig. 5 to 6, a first return structure for returning the piston 9 and the push rod 8 when the parking is cancelled is provided between the piston 9 and the push rod 8. The first reset structure comprises a spring seat 14 arranged on the push rod 8 in a penetrating mode, a reset spring 15 is arranged between the spring seat 14 and one end, facing the push rod 07, of the push rod 8, and a clamp spring 16 is arranged between the spring seat 14 and the shell 4. After the parking is released, the piston 9 returns to the initial position under the action of the clamp spring 16 and the return spring 15, the driving friction block 3 moves along the axial direction to be separated from the brake disc 2, and the friction braking on the brake disc 2 is released.
The caliper assembly of this embodiment can be connected on caliper support 1 along brake disc 2 axial displacement, as shown in fig. 3 ~ 6, this embodiment is provided with two at least sliding sleeves 21 that arrange along brake disc 2 axial on casing 4, wears to be equipped with the sliding pin 22 that can follow brake disc 2 axial displacement in the sliding sleeve 21, and the small support 23 is installed to the one end that sliding pin 22 faced clutch blocks 3, and small support 23 fixes on caliper support 1. The parking calliper assembly can be connected calliper support 1 along axial displacement ground through the integrated configuration of sliding pin 22 and sliding sleeve 21 on, be provided with the shield that corresponds sliding sleeve 21 on the casing 4, prevent that the foreign matter from invading, guarantee that the parking calliper assembly slides smoothly on sliding pin 22. A parking caliper assembly has two slide pins 22, defined as an auxiliary pin and a support pin, respectively, which differ in that the slide pins are dimensioned to fit with the internal bushing of the parking caliper assembly.
In addition, when the parking brake is released, two friction blocks 3 are required to be quickly separated from the brake disc 2, one friction block 3 corresponding to the piston 9 in the embodiment can realize the function through the action of the return spring 15 and the clamp spring 16, and the other friction block 3 is required to be driven by the friction block support 10 on the shell 4. As shown in fig. 3 to 4, the pad holder 10 of the present embodiment is an L-shaped support fixed on the housing 4, and the pad holder 10 and the small holder 23 form a U-shaped structure clamped on both sides of the brake disc 2 in the axial direction. In order to realize that the friction pad 3 can be quickly disengaged from the brake disc 2 when the parking brake is released, a second returning structure for returning the air chamber bracket 24 and the small bracket 23 after the parking brake is released is provided between the air chamber bracket 24 and the small bracket 23 in the present embodiment. The second return structure comprises return springs 25 fixed to the air chamber bracket 24 and the small bracket 23, respectively.
When in use, the upper part of the brake air chamber 5 is provided with an air inlet which is communicated with an air passage controlled by a parking manual control valve. When the automobile is parked, the brake air chamber 5 drives the rocker arm 6 to rotate, the rocker arm 6 drives the ejector rod 7 to rotate, a steel ball 19 on the ejector rod 7 rolls in a ball groove 20, the driving push rod 8 moves axially along the brake disc 2, the push rod 8 pushes the piston 9 to move axially, a friction block 3 corresponding to the piston 9 is tightly attached to the brake disc 2, the brake disc 2 generates reverse acting force on the piston 9, the whole shell 4 moves back to one side of the brake disc 2 along the axial direction of the brake disc 2 along the sliding pin 22, the friction block 3 corresponding to one side of the friction block support 10 moves axially to the side of the brake disc 2, and at the moment, the two friction blocks 3 are tightly attached to the brake disc 2 to generate a braking effect.
The shell of the main speed reducer 26 is fixed on a vehicle body or a vehicle frame, a transmission shaft is connected with a driving bevel gear of the main speed reducer 26 through a flange, power is transmitted to the main speed reducer (transmission ratio i0), and then is transmitted to a hub reduction gear (transmission ratio iw) through a differential and a hub half shaft, and wheels are driven through hubs. The brake disk 2 is mounted on a brake disk-flange assembly connected to the drive bevel gear to rotate together with the drive bevel gear. When parking, the friction plates 3 on the two sides of the brake disc 2 clamp the brake disc 2 under the actuation of the parking caliper assembly, so as to generate friction force and braking torque, the torque is amplified by the main reducer 26 and the wheel-side reducer in two stages (i0 × iw), and finally acts on the wheel, and a larger braking torque can be formed at the wheel end.
The parking brake can be arranged at the input end of the axle main reducer, also can be arranged at the input or output end of the transfer case, and also can be respectively arranged at two positions according to the stress requirement of the whole vehicle. In the above embodiment, the parking brake is fixed on the main reducer 26, if the parking brake is fixed on the input or output end of the transfer case, the caliper bracket 1 is fixed on the transfer case shell through bolts, the rest arrangement is similar to that of the main reducer, and the generated parking braking torque can also be amplified in two stages (i0 × iw) through the main reducer and the wheel reducer, and finally, a larger braking torque is formed at the wheel end.
When the parking is cancelled, the push rod 8 and the piston 9 return to the initial position under the action of the return spring 15 and the clamp spring 16, the friction block support 10 returns to the initial position under the action of the return spring 25, and the brake disc 2 is released from being clamped.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A clearance adjustable disc caliper characterized by: the device comprises a shell (4), a push rod (8) arranged in the shell (4) in a penetrating manner, a piston (9) fixed at the end part of the push rod (8) and a rotary ball transmission structure arranged in the shell (4) and used for driving the push rod (8) to move axially; the piston (9) is connected to the end part of the push rod (8) through threads, and a plurality of adjusting holes (11) which are arranged at intervals are formed in the end face of the outer side of the circumference of the piston (9).
2. An adjustable gap disc caliper according to claim 1, wherein: the piston (9) is provided with a plurality of straight end faces which are uniformly distributed along the circumferential direction of the piston (9) on the circumferential end face of one side of the friction block (3), and each straight end face is provided with an adjusting hole (11).
3. An adjustable gap disc caliper according to claim 1, wherein: at least one first limiting groove (12) is formed in the end face of the outer side of the circumference of the piston (9); the first limiting groove (12) is a U-shaped groove which is arranged along the axial direction of the piston (9) and is provided with an opening at one end; the shell (4) is provided with a first limit pin (13) which can extend into the first limit groove (12) to limit the rotation of the piston (9).
4. An adjustable gap disc caliper according to claim 1, wherein: a first reset structure which enables the piston (9) and the push rod (8) to reset when parking is cancelled is arranged between the piston (9) and the push rod (8).
5. An adjustable gap disc caliper according to claim 4, wherein: the first reset structure comprises a spring seat (14) arranged on the push rod (8) in a penetrating way; a return spring (15) is arranged between the spring seat (14) and the push rod (8), and a clamp spring (16) is arranged between the spring seat (14) and the shell (4).
6. An adjustable gap disc caliper according to claim 1, wherein: a second limiting groove (17) which is arranged along the axial direction is formed in the circumferential end face of the push rod (8); and a second limit pin (18) which can extend into the second limit groove (17) to limit the rotation of the push rod (8) penetrates through the shell (4).
7. An adjustable gap disc caliper according to claim 1, wherein: the rotary ball transmission structure comprises a push rod (7) arranged in the shell (4) in a penetrating way and a plurality of steel balls (19) arranged at the end part of the push rod (7); the end part of the ejector rod (7) is provided with a ball groove (20) for accommodating a steel ball (19); the ball groove (20) is an arc groove with variable depth; one end of the steel ball (19) is connected with the ball groove (20) in a rolling way, and the other end of the steel ball is tightly propped against one end of the push rod (8) far away from the piston (9).
8. A center parking brake apparatus with the adjustable clearance disc caliper of claim 1, characterized in that: comprises a brake air chamber (5), a small bracket (23), a friction block bracket (10) and a caliper bracket (1); the brake air chamber (5) is fixed on the shell (4) and is in transmission connection with a rocker arm (6) on the shell (4); one end of the rotary ball transmission structure is in transmission connection with the rocker arm (6), and the other end of the rotary ball transmission structure is in transmission connection with the push rod (8) and is used for converting the rotary motion of the rocker arm (6) into the axial linear motion of the push rod (8); the friction block support (10) is fixed on the shell (4) and is respectively arranged on two axial sides of the brake disc (2) together with the piston (9); the shell (4) can be connected to the caliper bracket (1) along the axial direction of the piston (9) in a moving way; and a second reset structure is arranged between the caliper bracket (1) and the shell (4).
9. A center parking brake apparatus according to claim 8, characterized in that: the second reset structure comprises a return spring (25) which is respectively fixed on the air chamber bracket (24) and the small bracket (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920400383.XU CN210034233U (en) | 2019-03-27 | 2019-03-27 | Clearance adjustable disk caliper and central parking arresting gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920400383.XU CN210034233U (en) | 2019-03-27 | 2019-03-27 | Clearance adjustable disk caliper and central parking arresting gear |
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| Publication Number | Publication Date |
|---|---|
| CN210034233U true CN210034233U (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920400383.XU Active CN210034233U (en) | 2019-03-27 | 2019-03-27 | Clearance adjustable disk caliper and central parking arresting gear |
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| CN (1) | CN210034233U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377539A (en) * | 2020-10-13 | 2021-02-19 | 东风汽车集团有限公司 | Brake device and vehicle |
| CN113374807A (en) * | 2021-07-29 | 2021-09-10 | 山东力得汽车科技股份有限公司 | Air pressure disc brake |
| CN115199680A (en) * | 2022-07-08 | 2022-10-18 | 潍柴动力股份有限公司 | Forced brake release device and method for walking motor |
-
2019
- 2019-03-27 CN CN201920400383.XU patent/CN210034233U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377539A (en) * | 2020-10-13 | 2021-02-19 | 东风汽车集团有限公司 | Brake device and vehicle |
| CN112377539B (en) * | 2020-10-13 | 2021-11-30 | 东风汽车集团有限公司 | Brake device and vehicle |
| CN113374807A (en) * | 2021-07-29 | 2021-09-10 | 山东力得汽车科技股份有限公司 | Air pressure disc brake |
| CN115199680A (en) * | 2022-07-08 | 2022-10-18 | 潍柴动力股份有限公司 | Forced brake release device and method for walking motor |
| CN115199680B (en) * | 2022-07-08 | 2024-03-19 | 潍柴动力股份有限公司 | Forced brake release device and method for walking motor |
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