CN214331285U - Parking brake for wheel hub motor with internal circulation ball structure - Google Patents

Abstract

The utility model relates to the technical field of parking brakes, in particular to a parking brake for an internal circulation ball structure hub motor, which comprises a bracket, a clamp body, a piston, a power unit and a screw rod, wherein the screw rod is arranged in the clamp body and is in transmission connection with the power unit, the outer side of the screw rod is provided with a screw sleeve and a ball returning device, the screw sleeve is arranged as an opening, the ball returning device is arranged at the opening of the screw sleeve, the screw sleeve and the ball returning device wrap the screw rod completely, the outer surface of the screw rod is provided with an inner track, the inner surface of the screw sleeve and the ball returning device is provided with an outer track, the inner track and the outer track are matched to form a circulation track, and a circulation ball is arranged in the circulation track. Under the conditions of reducing abrasion and ensuring the flow performance and stability of transmission, the space outside the screw sleeve is not occupied, and the structure is compact and efficient.

Description

Parking brake for wheel hub motor with internal circulation ball structure

Technical Field

The utility model relates to a parking brake technical field especially relates to an inner loop ball structure parking brake for wheel hub motor.

Background

The hub motor has the advantages of high efficiency, large peak torque, short acceleration time and the like, and is one of the important development directions of new energy automobiles in the future. The hub motor integrates devices such as steering, braking, driving and the like into the hub, so that the layout of a vehicle chassis is greatly simplified, but the gap left for the installation and the disassembly of the brake is greatly reduced. Meanwhile, the hub motor is in an outer rotor layout, the hub is used as a driving unit and is also used as a braking unit, and the brake is required to be arranged on the edge of the hub, so that the arrangement mode of the brake is greatly different from that of a conventional brake, and a matched and adaptive brake is required to be developed.

Chinese patent CN109185363A discloses a patent with a patent name of a floating caliper disc brake assembly structure for hub motors, which has the technical essential that: a floating caliper disc brake assembly structure for a wheel hub motor mainly comprises a caliper body, a shaft pin and a support, wherein a cylinder hole for placing a piston is formed in the caliper body, the caliper body is connected with the support through the shaft pin, a spring leaf provided with a friction plate is arranged on the support, the opening directions of the caliper body and the support are the radial direction of a brake disc, a brake caliper assembly can be reversely arranged on an annular brake disc special for the wheel hub motor, the friction plate slides by depending on the support of the spring leaf and is used for applying a braking force from an inner ring of the brake disc, the application applies the braking force from the inner ring of the brake disc, the overall structure is simple and compact, the strength and the rigidity are high, and therefore the braking effect of a wheel hub motor vehicle type is improved; generally the utility model discloses not only make full use of the inside space of brake disc is favorable to the whole of car to be arranged, and the dismouting is very simple and convenient moreover, uses good reliability, has also reduced manufacturing cost simultaneously, alleviates product weight, but this application only service braking function does not have parking braking function.

Chinese patent CN104712687B discloses a patent with the name of electronic parking brake, which has the technical points that: an electronic parking brake, comprising: a bracket, which is provided with a pair of backing plates capable of moving forward and backward; a caliper housing slidably disposed on the bracket and provided with a cylinder in which a piston is disposed; a motor disposed outside the caliper housing and generating a rotational force in a forward and reverse direction; a conversion unit converting a rotational force of the motor into a linear reciprocating motion and transmitting the linear reciprocating motion to the piston; the electronic parking brake comprises an adapter connected with a rotating shaft of the motor and connected with an output gear of the speed reducer, the rotating shaft and an output shaft of the output gear are coaxially connected in series through the adapter, and the output gear is supported by the adapter so as to avoid vibration during rotation; meanwhile, the method is only suitable for the arrangement scheme of the brake disc of the transmission automobile and is not suitable for the outer arrangement scheme of the brake disc of the hub motor type driving wheel.

Chinese patent CN110259852A discloses a patent with the name of floating brake for hub motor, which is technically characterized in that: a floating stopper for in-wheel motor, it includes the support, the pincers body, the piston, the uide pin, interior clutch blocks, outer clutch blocks, the pincers body is the integrated into one piece structure, and the support includes fixed part and assembly portion, and the uide pin activity is pegged graft in the pincers body and is fixed on the support, and during the braking, the slip direction of interior clutch blocks and is parallel with the axis of uide pin. The support wholly is "people" style of calligraphy, and the number of fixed part is two, and the one end fixed connection of assembly portion and two fixed parts constitutes "people" style of calligraphy support, this patent simple structure, convenient dismantlement, good heat dissipation, but what the inside of the pincers body of this patent still adopted is that face friction brakes, and wearing and tearing are great.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the background art the problem, a parking brake for inner loop ball structure wheel hub motor is provided.

In order to solve the technical problem, the utility model discloses a following technical scheme can solve:

a parking brake for an internal circulation ball structure hub motor comprises:

the bracket is used for being fixedly arranged on a vehicle and is a fixing piece;

the clamp body comprises a rolling bearing and a thrust bearing and is a movable part;

the piston is arranged in the caliper body in a clearance fit manner, and can axially move along the caliper body under the driving of hydraulic pressure during braking;

the power unit is arranged at the top of the clamp body and provides torque and rotating speed for the device in the clamp body;

the clamp comprises a clamp body, and is characterized by further comprising a screw rod, wherein the screw rod is arranged inside the clamp body, the top of the screw rod is in transmission connection with a power unit, the side wall of the top of the screw rod is in transmission connection with a rolling bearing and a thrust bearing, a screw sleeve and a bead returning device are arranged on the outer side of the screw rod, the screw sleeve is provided with an opening, the bead returning device is arranged at the opening of the screw sleeve, the screw sleeve and the bead returning device are combined to completely wrap the side surface of the screw rod, an inner rail is arranged on the outer surface of the screw rod, outer rails are arranged on the inner surfaces of the screw sleeve and the bead returning device, the inner rail and the outer rails are matched to form a circulating rail, a circulating ball is arranged in the circulating rail, and the circulating ball is extruded to roll when the screw rod rotates, so that the outer screw sleeve is driven to axially move; meanwhile, the screw is extruded by the counterforce of the circulating ball and arranged on the thrust bearing at the inner side of the clamp body, so that the thrust bearing moves reversely.

Preferably, the outer track of the ball returning device is arranged to be in an S shape, and the circulating ball changes the moving direction through the S-shaped outer track, so that the circulating ball is prevented from moving forwards axially.

Preferably, the connection between the power unit and the screw is provided with an output gear, the top end of the screw is provided with a concave gear groove structure, and the power unit provides driving torque and rotating speed for the screw through gear matching.

Preferably, the ball returning device is fixedly connected with the threaded sleeve through a mounting bolt, and the structure is stable and reliable.

Preferably, the top of the screw is provided with a limiting piece, and the limiting piece is arranged between the rolling bearing and the concave gear groove structure at the top end of the screw.

Preferably, the thrust bearing is arranged on one side, away from the power unit, of the rolling bearing, the check ring is arranged on the screw rod and located between the thrust bearing and the inner rail, and limiting bosses are arranged on one side, close to the threaded sleeve, of the check ring and one side, close to the check ring, of the threaded sleeve, so that excessive fitting between the screw rod and the threaded sleeve is avoided.

Preferably, the piston is arranged on the outer side of the screw rod, the threaded sleeve and the ball returning device, and when the threaded sleeve axially moves away from the power unit, the threaded sleeve extrudes the piston to enable the piston to axially move along with the threaded sleeve; meanwhile, the thrust bearing at the end of the clamp body moves reversely, and the thrust bearing extrudes the clamp body, so that the clamp body moves reversely along with the thrust bearing.

Preferably, an inner friction plate and an outer friction plate are arranged between the piston and the caliper body, the inner friction plate and the outer friction plate are both connected with the support in a sliding mode, when the piston and the caliper body move relatively, gaps are eliminated, the piston presses the inner friction plate, the caliper body presses the outer friction plate, the inner friction plate and the outer friction plate both move close to a brake disc, and the brake disc is pressed to perform parking braking action.

Preferably, the braking device further comprises a guide pin, the support and the clamp body are movably connected together through the guide pin, in the braking process, the clamp body moves in the direction opposite to the movement direction of the piston along the axial direction of the guide pin, lug holes are formed in two sides of the clamp body, the guide pin is inserted into the lug holes and penetrates through the lug holes to be fixedly connected with the support through threads, a rubber bushing is arranged at the contact position of the guide pin and the lug holes, the guide pin and the rubber bushing are in interference fit, and due to the compression deformation effect of rubber, the clamp body has certain degree of freedom on the guide pin, and the braking effect can be achieved.

Preferably, a seal ring is provided at a side end of the piston away from the power unit, and the seal ring can prevent brake fluid from leaking during service braking.

The utility model discloses owing to adopted above technical scheme, have apparent technological effect:

firstly, the utility model provides a circulation ball formula parking transmission structure changes the sliding motion mode between screw rod and swivel nut into rolling, has reduced the coefficient of friction of product, has improved transmission efficiency, has reduced the static friction force on the contact surface simultaneously, has improved the sensitivity of product transmission, secondly has reduced the wearing and tearing between the product, improves the life of structural component;

secondly, the utility model provides a parking returns pearl ware with "S" shape track structure, the motion direction of adjustment circulating ball makes it return to initial track, has guaranteed driven procedure nature and stationarity;

thirdly, the utility model provides a track scheme with an internal circulation structure, the circulation ball is integrally positioned on the track of the internal space of the screw sleeve, the space outside the screw sleeve is not occupied, and the structure is compact and efficient;

fourth, the utility model provides a dual-purpose in-wheel motor of parking, driving stopper.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of a power unit in embodiment 1 of the present invention.

Fig. 3 is a schematic structural view of the interior of the caliper body according to embodiment 1 of the present invention.

Fig. 4 is a schematic structural view of the inside of the shaft sleeve according to embodiment 1 of the present invention.

Fig. 5 is a schematic structural diagram of a combination of the screw rod, the shaft sleeve and the ball returning device in embodiment 1 of the present invention.

Fig. 6 is a schematic structural diagram of a combination of the screw rod, the shaft sleeve and the ball returning device in embodiment 1 of the present invention.

Fig. 7 is a schematic structural view of the bead returning device in embodiment 1 of the present invention.

The names of the parts indicated by the numerical references in the drawings are as follows: the device comprises a support 1, an inner friction plate 11, an outer friction plate 12, a clamp body 2, a rolling bearing 21, a thrust bearing 22, an ear hole 23, a piston 3, a sealing ring 31, a power unit 4, an output gear 41, a screw rod 5, an inner track 51, a limiting piece 52, a check ring 53, a limiting boss 54, a threaded sleeve 6, an outer track 61, a bead returning device 7, an installation bolt 71, a circulating track 8, a circulating ball 81, a guide pin 9 and a rubber bushing 91.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

As shown in fig. 1 to 7, a parking brake for an internal circulation ball structure hub motor includes: the support 1 is used for being fixedly arranged on a vehicle and is a fixing piece; the pliers body 2 comprises a rolling bearing 21 and a thrust bearing 22, and is a movable piece; the piston 3 is arranged in the caliper body 2 in a clearance fit manner, and can axially move along the caliper body 2 under the driving of hydraulic pressure during braking; the power unit 4 is arranged at the top of the caliper body 2, provides torque and rotating speed for the device in the caliper body 2, and further comprises a guide pin 9, the support 1 and the caliper body 2 are movably connected together through the guide pin 9, and in the braking process, the caliper body 2 moves along the axial direction of the guide pin 9 in the direction opposite to the movement direction of the piston 3.

The clamp comprises a clamp body 2 and is characterized by further comprising a screw rod 5, the screw rod 5 is arranged inside the clamp body 2, the top of the screw rod 5 is in transmission connection with a power unit 4, the side wall of the top of the screw rod 5 is in transmission connection with a rolling bearing 21 and a thrust bearing 22, a screw sleeve 6 and a bead returning device 7 are arranged on the outer side of the screw rod 5, the screw sleeve 6 is arranged to be an opening, the bead returning device 7 is arranged at the opening of the screw sleeve 6, the bead returning device 7 is fixedly connected with the screw sleeve 6 through a mounting bolt 71, the screw sleeve 6 and the bead returning device 7 are combined to completely wrap the side face of the screw rod 5, an inner rail 51 is arranged on the outer surface of the screw rod 5, an outer rail 61 is arranged on the inner surface of the screw sleeve 6 and the inner surface of the bead returning device 7, the inner rail 51 is matched with the outer rail 61 to form a circulating rail 8, and a circulating ball 81 is arranged in the circulating rail 8.

Wherein, the outer track 61 of the ball returning device 7 is set to be S-shaped, and the circulating ball 81 changes the moving direction through the S-shaped outer track 61, so that the circulating ball 81 is prevented from moving forwards axially.

When the screw rod 5 rotates, the circulating ball 81 is extruded to roll, and then the outer thread sleeve 6 is driven to axially move; at the same time, the screw 5 is pressed against the thrust bearing 22 disposed inside the caliper body 2 by the reaction force of the circulating ball 81, so that the reverse movement occurs.

The piston 3 in the embodiment is arranged at the outer side of the screw rod 5, the threaded sleeve 6 and the ball returning device 7, and when the threaded sleeve 6 axially moves away from the power unit 4, the threaded sleeve 6 extrudes the piston 3, so that the piston 3 axially moves along with the threaded sleeve 6; meanwhile, the thrust bearing 22 at the end of the pincer body 2 moves reversely, and the thrust bearing 22 presses the pincer body 2, so that the pincer body 2 moves reversely along with the thrust bearing 22.

In this embodiment, an output gear 41 is disposed at a connection portion between the power unit 4 and the screw 5, a top end of the screw 5 is configured to be a concave gear groove structure, the power unit 4 provides a driving torque and a rotating speed for the screw 5 through gear matching, the thrust bearing 22 is disposed on a side of the rolling bearing 21 away from the power unit 4, a retaining ring 53 is disposed on the screw 5, the retaining ring 53 is located between the thrust bearing 22 and the inner rail 51, both a side of the retaining ring 53 close to the threaded sleeve 6 and a side of the threaded sleeve 6 close to the retaining ring 53 are provided with a limiting boss 54, so as to prevent the screw 5 and the threaded sleeve 6 from being excessively attached to each other, in addition, a top portion of the screw 5 is provided with a limiting member 52, and the limiting member 52 is disposed between the rolling bearing 21 and the concave gear groove structure at the top end of the screw 5.

An inner friction plate 11 and an outer friction plate 12 are arranged between a piston 3 and a caliper body 2, the inner friction plate 11 and the outer friction plate 12 are connected with a support 1 in a sliding mode, when the piston 3 and the caliper body 2 move relatively, gaps are eliminated, the piston 3 extrudes the inner friction plate 11, the caliper body 2 extrudes the outer friction plate 12, the inner friction plate 11 and the outer friction plate 12 all move close to a brake disc, and the brake disc is extruded to perform parking braking.

The embodiment also comprises a guide pin 9, the guide pin 9 movably connects the bracket 1 and the caliper body 2 together, and during braking, the caliper body 2 moves along the axial direction of the guide pin 9 in the direction opposite to the movement of the piston 3.

Parking brake mechanism: after the parking signal is sent, the power unit 4 provides torque and rotating speed for the screw rod 5 through the rolling bearing 21, when the screw rod 5 rotates, the circulating ball 81 is extruded to roll, and then the screw sleeve 6 on the outer side of the screw rod is driven to axially move, meanwhile, the screw rod 5 is extruded by the reaction force of the circulating ball 81 to extrude the thrust bearing 22 arranged on the inner side of the caliper body 2, so that the thrust bearing 22 reversely moves, when the screw sleeve 6 axially moves away from the power unit 4, a gap between the piston 3 and the screw rod 5 can be eliminated, meanwhile, the screw rod 5 can extrude the piston 3 to axially move, at the moment, the thrust bearing 22 on the end part of the caliper body 2 reversely moves, the extrusion caliper body 2 follows the thrust bearing to reversely move, the piston 3 extrudes the inner friction plate 11, the caliper body 2 extrudes the outer friction plate 12, and then the inner friction plate 11 and the outer friction plate 12 extrude the brake disc to generate the parking braking action.

The service braking mechanism is as follows: the outside of the clamp body 2 is connected with an external brake hydraulic pipeline through an oil inlet; the interior and the piston 3 form a brake hydraulic space, and a sealing ring 31 is arranged to prevent brake fluid from leaking, and after external brake fluid enters the cylinder body in the caliper body 2 through the oil inlet hole, brake pressure is built on the piston 3 and the caliper body 2, and the brake pressure are separated from each other. The piston 3 presses the inner friction plate 11 close to the brake disc, and the caliper body 2 presses the outer friction plate 12 to move towards the brake disc. With the enhancement of brake hydraulic pressure, the brake clearance is eliminated, the inner friction plate 11 and the outer friction plate 12 are pressed to the brake disc, and the service braking action is formed.

Example 2

This embodiment is different from embodiment 1 in that: the two sides of the pliers body 2 are provided with ear holes 23, the guide pin 9 is inserted in the ear holes 23, and the guide pin 9 penetrates through the ear holes 23 and is fixedly connected with the bracket 1 through threads.

Example 3

This embodiment is different from embodiment 2 in that: the rubber bushing 91 is arranged at the contact position of the guide pin 9 and the ear hole 23, the guide pin 9 and the rubber bushing 91 are in interference fit, and due to the compression deformation effect of rubber, the caliper body 2 has certain degree of freedom on the guide pin 9, and the braking effect can be realized.

Claims (10)

1. A parking brake for an internal circulation ball structure hub motor comprises:

the support (1), the support (1) is used for fixedly installing on the vehicle, it is a stationary part;

the pliers body (2), the pliers body (2) includes rolling bearing (21) and thrust bearing (22), it is a moving part;

the piston (3) is arranged in the caliper body (2) in a clearance fit manner, and can axially move along the caliper body (2) under the driving of hydraulic pressure during braking;

the power unit (4) is arranged at the top of the clamp body (2) and provides torque and rotating speed for the internal device of the clamp body (2);

the method is characterized in that: the novel ball-returning type ball clamp is characterized by further comprising a screw rod (5), the screw rod (5) is arranged inside the clamp body (2), the top of the screw rod (5) is in transmission connection with the power unit (4), the side wall of the top of the screw rod (5) is in transmission connection with the rolling bearing (21) and the thrust bearing (22), a screw sleeve (6) and a ball returning device (7) are arranged on the outer side of the screw rod (5), the screw sleeve (6) is arranged to be opened, the ball returning device (7) is arranged at the opening of the screw sleeve (6), the screw sleeve (6) and the ball returning device (7) are combined to completely wrap the side face of the screw rod (5), an inner rail (51) is arranged on the outer surface of the screw rod (5), an outer rail (61) is arranged on the inner surfaces of the screw sleeve (6) and the ball returning device (7), the inner rail (51) and the outer rail (61) are matched to form a circulating rail (8), and a circulating ball (81) is arranged in the circulating rail (8).

2. The parking brake for the internal circulation ball structure hub motor according to claim 1, wherein: the outer track (61) of the ball returning device (7) is arranged to be S-shaped, and the circulating ball (81) changes the moving direction through the S-shaped outer track (61).

3. The parking brake for the internal circulation ball structure hub motor according to claim 1, wherein: an output gear (41) is arranged at the joint of the power unit (4) and the screw (5), the top end of the screw (5) is of a concave gear groove structure, and the power unit (4) is matched with the screw (5) through a gear to provide driving torque and rotating speed for the screw (5).

4. The parking brake for the internal circulation ball structure hub motor according to claim 1, wherein: the ball returning device (7) is fixedly connected with the threaded sleeve (6) through a mounting bolt (71).

5. The parking brake for the internal circulation ball structure hub motor according to claim 3, wherein: the top of the screw rod (5) is provided with a limiting piece (52), and the limiting piece (52) is arranged between the rolling bearing (21) and the concave gear groove structure at the top end of the screw rod (5).

6. The parking brake for the internal circulation ball structure hub motor according to claim 5, wherein: the thrust bearing (22) is arranged on one side, far away from the power unit (4), of the rolling bearing (21), the screw rod (5) is provided with a retaining ring (53), the retaining ring (53) is located between the thrust bearing (22) and the inner rail (51), and limiting bosses (54) are arranged on one side, close to the threaded sleeve (6), of the retaining ring (53) and one side, close to the retaining ring (53), of the threaded sleeve (6).

7. The parking brake for the internal circulation ball structure hub motor according to claim 5, wherein: the piston (3) is arranged on the outer side of the screw rod (5), the threaded sleeve (6) and the ball returning device (7), and when the threaded sleeve (6) axially moves away from the power unit (4), the threaded sleeve (6) extrudes the piston (3), so that the piston (3) axially moves along with the threaded sleeve (6); meanwhile, the thrust bearing (22) at the end part of the clamp body (2) moves reversely, and the thrust bearing (22) extrudes the clamp body (2), so that the clamp body (2) moves reversely along with the thrust bearing (22).

8. The parking brake for the internal circulation ball structure hub motor according to claim 1, wherein: be equipped with interior friction disc (11) and outer friction disc (12) between piston (3) and the pincers body (2), interior friction disc (11) all with support (1) sliding connection with outer friction disc (12), when piston (3) and pincers body (2) carry out relative motion, the clearance is eliminated, friction disc (11) in piston (3) extrusion, pincers body (2) extrusion outer friction disc (12), the motion that is close to the brake disc all takes place for interior friction disc (11) and outer friction disc (12), the extrusion brake disc takes place parking braking action.

9. The parking brake for the internal circulation ball structure hub motor according to claim 1, wherein: still include uide pin (9), uide pin (9) are in the same place support (1) and pincers body (2) swing joint, braking in-process, pincers body (2) move along uide pin (9) axial and piston (3) opposite direction of motion, pincers body (2) both sides are equipped with earhole (23), uide pin (9) are inserted and are established in earhole (23), uide pin (9) pass earhole (23) and pass through screw thread fixed connection with support (1), uide pin (9) and earhole (23) contact department are provided with rubber bush (91), uide pin (9) set up to interference fit with rubber bush (91).

10. The parking brake for the internal circulation ball structure hub motor according to claim 1, wherein: and a sealing ring (31) is arranged at the side end of the piston (3) far away from the power unit (4).

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