CN216478601U

CN216478601U - Parking brake

Info

Publication number: CN216478601U
Application number: CN202123197983.7U
Authority: CN
Inventors: 郭建振; 张克谦; 乔君辉; 李晓龙; 李文举; 刘金雨; 马德亮
Original assignee: Exquisite Automotive Systems Co Ltd
Current assignee: Exquisite Automotive Systems Co Ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-05-10
Anticipated expiration: 2031-12-17

Abstract

The utility model provides a parking brake, including the pincers body, locate friction disc and actuating mechanism on the pincers body, the internal chamber that holds that is formed with of pincers, actuating mechanism locates the piston that holds the intracavity including sliding to and can drive the gliding lead screw pair of piston, the piston is connected with friction disc transmission, the lead screw is vice to include the lead screw and with the screw nut that screw drive is connected, screw nut sets firmly in the piston, is equipped with the locking piece on the piston, the locking piece is connected with screw drive, and can make the lead screw be in the locking state for the pincers body. Parking brake set up the piston in the intracavity that holds of the pincers body, be connected piston and friction disc again to with the lead screw secondary drive piston removal, with the realization to the drive of friction disc, owing to set up the locking piece again, make the pincers body press from both sides tight back, even lose outside drive power, braking pincers clamp force still can keep, and can improve application reliability.

Description

Parking brake

Technical Field

The utility model relates to a arresting gear and technical field, in particular to parking brake.

Background

With the gradual popularization of new energy vehicles, intelligent driving has become the development direction of future vehicles. Because the traditional vacuum booster can not quantitatively complete braking assistance, namely intelligent active driving can not be realized, the conventional vacuum booster is basically replaced by an electronic booster (Eboost) and an Electronic Hydraulic Brake (EHB) on an intelligent new energy vehicle. Although the electronic booster is a better solution for intelligent driving at present, the electronic booster still needs to be realized through hydraulic participation. The hydraulic brake system inevitably has many problems such as brake fluid leakage and energy loss when the liquid is involved in braking.

So far, brake-by-wire without hydraulic intervention has not been used in large numbers, because the existing electromechanical brake calipers and actuators still have the following disadvantages:

1. the service life is difficult to meet the requirements;

2. the clamping force is insufficient, and the braking distance is too long;

3. self-locking cannot be realized, and the braking capability during parking is insufficient.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a parking brake to improve the braking capability of parking.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a parking brake comprises a caliper body, a friction plate and a driving mechanism, wherein the friction plate and the driving mechanism are arranged on the caliper body;

an accommodating cavity is formed in the clamp body;

the driving mechanism comprises a piston arranged in the accommodating cavity in a sliding manner and a lead screw pair capable of driving the piston to slide; the piston is in transmission connection with the friction plate;

the screw pair comprises a screw and a screw nut in transmission connection with the screw; the screw rod nut is fixedly arranged in the piston;

the piston is provided with a locking piece, and the locking piece is in transmission connection with the lead screw and can enable the lead screw to be in a locking state relative to the clamp body.

Furthermore, a groove is formed on the piston, and a guide sliding block is embedded in the groove; the piston is in sliding contact with the inner wall of the accommodating cavity through the guide sliding block.

Furthermore, a cavity for accommodating the piston is formed in the piston, one end of the piston is connected with the friction plate, and the other end of the piston is provided with an opening communicated with the cavity; the locking piece is located in the cavity near the open-ended position, the locking piece include with the auto-lock nut that the lead screw spiro union links to each other.

Furthermore, a first rotation stopping structure is arranged between the self-locking nut and the piston; the first rotation stopping structure is used for limiting the self-locking nut to rotate around the center line of the cavity relative to the piston.

Further, the first rotation stopping structure comprises a first groove and a first boss; the first groove is formed in one of the self-locking nut and the piston, the first boss is arranged on the other of the self-locking nut and the piston, and the first boss is embedded in the first groove.

Furthermore, a second rotation stopping structure is arranged between the piston and the clamp body; the second rotation stopping structure is used for limiting the piston to rotate around the central line of the cavity relative to the caliper body.

Further, the second rotation stopping structure comprises a second groove and a second boss; the second groove is formed in one of the piston and the clamp body, the second boss is formed in the other of the piston and the clamp body, and the second boss is embedded in the second groove.

Furthermore, one end of the accommodating cavity facing the friction plate is provided with an opening, and a protective cover used for sealing a gap between the piston and the caliper body is arranged at the opening; one end of the protective cover is arranged on the piston, and the other end of the protective cover is arranged on the clamp body.

Further, relative to one end of the accommodating cavity, which is arranged at the opening, the other end of the accommodating cavity is provided with a bottom wall with a through hole; the lead screw is provided with an extending section extending out of the cavity from the opening, the extending section is rotatably arranged on the clamp body through a double-row bearing, and the lead screw bears a rotary driving force through the extending section; the extending section penetrates through the through hole, and a shaft shoulder is formed on the extending section; the extending section is sleeved with a thrust bearing clamped between the shaft shoulder and the bottom wall.

Furthermore, the screw pair adopts a planetary roller screw pair.

Compared with the prior art, the utility model discloses following advantage has:

(1) parking brake, set up the piston in the intracavity that holds of the pincers body, be connected piston and friction disc again to with the lead screw secondary drive piston removal, with the realization to the drive of friction disc, owing to set up the locking piece on the piston again, in order can carry out the locking to the lead screw, the friction disc can not produce the removal behind the lead screw locking, can improve the braking capability of the parking of car, and improves parking brake's application reliability.

(2) Through inlay the dress and lead the slider in the recess of piston to lead the slider in the inner wall butt that holds the chamber, reducible piston itself and the area of contact who holds the chamber lateral wall, thereby can reduce the friction of piston and the lateral wall that holds the chamber.

(3) Through setting up self-locking nut for the lead screw can not rotate when losing external drive, can improve parking braking's ability.

(4) A first rotation stopping structure is arranged between the self-locking nut and the piston, so that the self-locking nut can be prevented from rotating in the piston.

(5) The first rotation stopping mechanism comprises a first groove and a first boss, the first groove and the first boss are respectively arranged on the self-locking nut and the piston, and the first boss is embedded in the first groove, so that the structure is simple, and the use is convenient.

(6) A second rotation stopping structure is arranged between the clamp body and the piston, so that the piston can be prevented from rotating in the cavity of the clamp body.

(7) The second rotation stopping mechanism comprises a second groove and a second boss, the second groove and the second boss are respectively arranged on the self-locking nut and the piston, and the second boss is embedded in the second groove.

(8) Through setting up the protection casing, can seal the clearance between piston and the pincers body, prevent that sewage and dust etc. from getting into and causing adverse effect between the pincers body and the piston.

(9) The lead screw is arranged on the clamp body through the double-row bearing, the running stability of the lead screw can be improved, and the thrust bearing is arranged on the lead screw, so that the axial force can be borne, and the lead screw can be favorably ensured to smoothly rotate on the clamp body.

(10) The screw pair adopts a planetary roller screw pair, the technology is mature, and the use is convenient.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a cross-sectional view of a parking brake according to an embodiment of the present invention;

fig. 2 is an exploded view of a parking brake according to an embodiment of the present invention;

fig. 3 is an exploded view of a screw pair according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a piston according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a second rotation stop structure according to an embodiment of the present invention;

fig. 6 is an exploded view of a screw pair and a motor according to an embodiment of the present invention;

fig. 7 is an exploded view of a first rotation stop structure according to an embodiment of the present invention;

fig. 8 is a cross-sectional view of an overhanging section according to an embodiment of the present invention.

Description of reference numerals:

1. a friction plate; 2. a clamp body; 3. a protective cover; 4. a piston; 5. a guide slider; 6. a lead screw pair; 7. a self-locking nut; 8. a thrust bearing; 9. a double-row bearing; 10. a motor;

201. a second groove;

401. a second boss; 402. a first groove;

601. a clamp spring; 602. a holder; 603. a straight-tooth gear ring; 604. a lead screw nut; 605. an anti-rotation fixing bolt; 606. a roller; 607. an overhanging section; 6071. connecting grooves;

701. a first boss;

1001. and connecting the lug bosses.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless expressly limited otherwise. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in conjunction with the specific situation for a person of ordinary skill in the art.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The embodiment relates to a parking brake, which comprises a caliper body 2, a friction plate 1 arranged on the caliper body 2 and a driving mechanism. Wherein, be formed with in the pincers body 2 and hold the chamber, actuating mechanism includes piston 4 and can drive the gliding screw pair 6 of piston 4, and piston 4 slides and locates and hold the intracavity, and piston 4 is connected with friction disc 1 transmission. The connection between the piston 4 and the friction plate 1 can be referred to the connection between the driving mechanism and the friction plate in the prior art, and is not described in detail herein.

The screw pair 6 comprises a screw and a screw nut 604, the screw nut 604 is in transmission connection with the screw, and the screw nut 604 is fixedly arranged in the piston 4. The piston 4 is provided with a locking piece which is in transmission connection with the screw rod and can enable the screw rod to be in a locking state relative to the clamp body 2.

Because the piston 4 is provided with the locking piece, the screw rod can be locked, and the piston 4 can not drive the friction plate 1 to move after the screw rod is locked, so that the braking capacity of the automobile for parking is improved.

Based on the above design concept, an exemplary structure of the parking brake of the present embodiment is shown in fig. 1 and fig. 2, a caliper body 2 is an existing floating caliper, two friction plates 1 arranged at intervals are arranged at the left end of the caliper body 2, and the connection manner of the friction plates 1 and the caliper body 2 can adopt the existing mature technology. The two friction plates 1 can move due to one of the friction plates 1 or the two friction plates 1 move together to change the distance between the friction plates 1, so that clamping or releasing is realized.

One end of the containing cavity facing the friction plate 1 is provided with an opening, and the opening is provided with a protective cover 3 for sealing a gap between the piston 4 and the caliper body 2. Specifically, one end of the protective cover 3 is arranged on the piston 4, and the other end of the protective cover 3 is arranged on the forceps body 2. The protection casing 3 and the connected mode between the protection casing 3 can adopt suitable connected modes such as welding, bonding and spiro union, thereby the setting of protection casing 3 can prevent that foreign matters such as sewage and dust from entering into through the clearance between piston 4 and the pincers body 2 and holding the intracavity and cause adverse effect to pincers body 2 and piston 4.

Referring to fig. 1, 3 and 4, the screw pair 6 adopts a planetary roller screw pair 6 to convert the rotary motion of the screw into linear motion, and the technology is mature and convenient to use. In addition to the aforementioned spindle and spindle nut 604, the spindle arrangement 6 also comprises eight rollers 606, each roller 606 being arranged between the spindle and the spindle nut 604.

The inner wall of the screw nut 604 and the screw are formed with multiple threads, and the tooth form of the multiple threads is a 90-degree triangle. The roller 606 has a single start thread formed on the side wall and the profile is a spherical profile. The outside of the roller 606 engages the screw nut 604 and the inside of the roller 606 engages the screw.

In order to eliminate the tilting moment generated by the lead screw lead angle to the roller 606, straight teeth are formed at both ends of the roller 606, and a straight tooth gear ring 603 is installed in the lead screw nut 604. A threaded hole is formed in the side wall of the screw nut 604, an anti-rotation fixing bolt 605 is screwed in the threaded hole, and the bottom end of the anti-rotation fixing bolt 605 abuts against the straight-tooth gear ring 603, so that the straight-tooth gear ring 603 cannot rotate relative to the screw nut 604. The spur of the roller 606 meshes with the spur toothing 603, ensuring that the roller 606 rolls on the roller with its axis parallel to the axis of the screw. In order to uniformly distribute the rollers 606 along the circumference, the lead screw nut 604 is internally provided with a retainer 602 arranged at intervals, the retainer 602 is axially positioned by the snap spring 601, the retainer 602 is provided with retaining holes corresponding to the rollers 606 in number, and two ends of the rollers 606 are inserted into the retaining holes.

In addition, for the one end that holds the uncovered setting in chamber, the other end that holds the chamber has the diapire of seting up the via hole. The lead screw comprises an extending section 607 extending out of the cavity from the opening, the extending section 607 is rotatably arranged on the caliper body 2 through the double-row bearing 9, and the lead screw bears the rotational driving force through the extending section 607.

The extending section 607 penetrates through the through hole, a shaft shoulder is formed on the extending section 607, the thrust bearing 8 clamped between the shaft shoulder and the bottom wall is sleeved on the extending section 607, the double-force bearing and the thrust bearing 8 can bear the axial force of the screw rod, and the screw rod can drive the piston 4 conveniently.

Referring to fig. 1 and 6, a motor 10 is fixed at the right end of the caliper body 2, a connecting groove 6071 is formed at a position of the side wall of the extending section 607 close to the right end, a connecting boss 1001 is correspondingly formed on the motor 10, the connecting boss 1001 is inserted into the connecting groove 6071, and the right end of the extending section 607 is connected to the power output end of the motor 10.

The motor 10 is electrified to generate torque to drive the screw rod to rotate, the screw rod drives the rollers 606 to do self-rotation motion along respective axes, because the two ends of the rollers 606 are provided with straight teeth and are meshed with the straight tooth gear rings 603, the rollers 606 revolve along the axes of the gear rings, the threads of the rollers 606 are meshed with the threads of the screw nut 604, and because the threads of the rollers 606 and the screw nut 604 are provided with thread lead angles, the screw nut 604 linearly moves along the axes of the screw rod at the time, and because the screw nut 604 is fixed in the cavity of the piston 4, the piston 4 linearly moves along the axes of the screw rod under the driving of the screw rod pair, and then the friction plate 1 is clamped or released.

In the transmission process, it is required to ensure that the piston 4 and the caliper body 2 cannot perform relative rotation movement along the axis of the piston 4, and as shown in fig. 5, a second rotation stopping structure is arranged between the piston 4 and the caliper body. Specifically, the second rotation stopping structure includes a second groove 201 and a second boss 401, the second groove 201 is formed on a side wall of the accommodating cavity of the caliper body 2, the second boss 401 is formed on a side wall of the piston 4, the second boss 401 is embedded in the second groove 201, but the second boss 401 may be formed on a side wall of the accommodating cavity, and the second groove 201 is formed on a side wall of the piston 4.

As shown in fig. 4, a groove is formed on the side wall of the piston 4, a guide slider 5 is embedded in the groove, a part of the guide slider 5 protrudes out of the groove, and the piston 4 is in sliding contact with the inner wall of the accommodating cavity through the guide slider 5. Wherein the material of guide slider 5 can be metal steel or non-metallic plastics, nylon etc. through come with guide slider 5 with the inner wall contact that holds the chamber, reduced piston 4 and the interior wall contact area who holds the chamber between, and then reduced frictional force between the two, the removal of the intracavity is held to the piston 4 of being more convenient for.

In addition, in order to improve the parking brake capability of the vehicle, that is, after the brake caliper completes the clamping action and cuts off the power of the motor 10, the clamping force still needs to be maintained, and for this reason, the self-locking member includes a self-locking nut 77 in this embodiment. Specifically, a cavity for accommodating the lead screw nut 604 is formed in the piston 4, and an opening communicating with the cavity is formed at the other end of the piston 4 opposite to the end of the piston 4 connected with the friction plate 1. And the self-locking nut 7 is in threaded connection with the lead screw and is arranged in the cavity close to the opening.

As shown in fig. 7, a first rotation stopping structure is arranged between the self-locking nut 7 and the piston 4, and the first rotation stopping structure is used for limiting the self-locking nut 7 to rotate around the center line of the cavity relative to the piston 4. In this embodiment, the first rotation stopping structure includes a first groove 402 and a first boss 701, the first groove 402 is formed at a position close to the opening of the inner wall of the cavity, the first boss 701 is formed on the side wall of the self-locking nut 7, and the first boss 701 is embedded in the first groove 402. Of course, the first groove 402 may be opened on the side wall of the self-locking nut 7, and the first boss 701 is formed on the inner wall of the cavity.

Finally, as shown in fig. 8, the flank angle a of the thread of the lead screw is 45 °, the self-locking nut 7 is formed with an internal thread having a wedge shape, wherein the flank angle c on one side is 45 ° for mating with the thread on the lead screw, and the flank angle b on the other side is less than 45 °, and in the present embodiment is preferably 20 °. When the piston 44 retracts, the self-locking nut 77 side angle b smaller than 45 degrees is matched with the thread of the screw rod, so that the self-locking purpose is realized.

The utility model discloses a parking brake sets up piston 4 in the intracavity that holds of the pincers body 2, is connected piston 4 with friction disc 1 again to drive piston 4 with lead screw pair 6 and remove, with the realization to friction disc 1's drive, owing to set up the locking piece on piston 4 again, in order to carry out the locking to the lead screw, friction disc 1 can not produce the removal after the lead screw locking, has improved the braking capacity of the parking of car.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a parking brake, includes pincers body (2), locates friction disc (1) and actuating mechanism on pincers body (2), its characterized in that:

an accommodating cavity is formed in the clamp body (2);

the driving mechanism comprises a piston (4) arranged in the accommodating cavity in a sliding manner and a lead screw pair (6) capable of driving the piston (4) to slide; the piston (4) is in transmission connection with the friction plate (1);

the screw pair (6) comprises a screw and a screw nut (604) in transmission connection with the screw; the screw nut (604) is fixedly arranged in the piston (4);

the piston (4) is provided with a locking piece, and the locking piece is in transmission connection with the lead screw and can enable the lead screw to be in a locking state relative to the clamp body (2).

2. The parking brake of claim 1, characterized in that:

a groove is formed on the piston (4), and a guide sliding block (5) is embedded in the groove;

the piston (4) is in sliding contact with the inner wall of the accommodating cavity through the guide sliding block (5).

3. The parking brake of claim 1, characterized in that:

a cavity for accommodating the screw nut (604) is formed in the piston (4), one end of the piston (4) is connected with the friction plate (1), and the other end of the piston is provided with an opening communicated with the cavity;

the locking piece is arranged in the cavity and close to the position of the opening, and the locking piece comprises a self-locking nut (7) connected with the lead screw in a threaded manner.

4. The parking brake of claim 3, characterized in that:

a first rotation stopping structure is arranged between the self-locking nut (7) and the piston (4);

the first rotation stopping structure is used for limiting the self-locking nut (7) to rotate around the center line of the cavity relative to the piston (4).

5. The parking brake of claim 4, characterized in that:

the first rotation stopping structure comprises a first groove (402) and a first boss (701);

the first groove (402) is formed in one of the self-locking nut (7) and the piston (4), the first boss (701) is formed in the other of the self-locking nut (7) and the piston (4), and the first boss (701) is embedded in the first groove (402).

6. The parking brake of claim 3, characterized in that:

a second rotation stopping structure is arranged between the piston (4) and the clamp body (2);

the second rotation stopping structure is used for limiting the piston (4) to rotate around the central line of the cavity relative to the caliper body (2).

7. The parking brake of claim 6, characterized in that:

the second rotation stopping structure comprises a second groove (201) and a second boss (401);

the second groove (201) is formed in one of the piston (4) and the caliper body (2), the second boss (401) is formed in the other of the piston (4) and the caliper body (2), and the second boss (401) is embedded in the second groove (201).

8. The parking brake of claim 3, characterized in that:

one end of the accommodating cavity, facing the friction plate (1), is provided with an opening, and the opening is provided with a protective cover (3) for sealing a gap between the piston (4) and the caliper body (2);

one end of the protective cover (3) is arranged on the piston (4), and the other end of the protective cover is arranged on the pliers body (2).

9. The parking brake of claim 8, wherein:

the other end of the accommodating cavity is provided with a bottom wall with a through hole relative to the open end of the accommodating cavity;

the screw rod is provided with an extending section (607) extending out of the cavity from the opening, the extending section (607) is rotatably arranged on the clamp body (2) through a double-row bearing (9), and the screw rod bears rotational driving force through the extending section (607);

the overhanging section (607) penetrates through the through hole, and a shaft shoulder is formed on the overhanging section (607);

and a thrust bearing (8) clamped between the shaft shoulder and the bottom wall is sleeved on the outward extending section (607).

10. Parking brake according to any one of claims 1-9, characterized in that:

the screw pair (6) adopts a planetary roller screw pair (6).