CN113638966B

CN113638966B - Lever and disc brake

Info

Publication number: CN113638966B
Application number: CN202110925765.6A
Authority: CN
Inventors: 任艳强; 郑健; 金元; 陈昌微
Original assignee: LONGZHONG HOLDING GROUP CO LTD
Current assignee: LONGZHONG HOLDING GROUP CO LTD
Priority date: 2021-08-12
Filing date: 2021-08-12
Publication date: 2023-01-17
Anticipated expiration: 2041-08-12
Also published as: CN113638966A

Abstract

The invention provides a lever and disc brake, and belongs to the technical field of brakes. The brake solves the problems that the existing brake cannot be used for dismounting, maintaining and improving the structural stability. This lever, including lever body and roller, the supporting part has on the lever body, be provided with the holding surface that is the circular arc cylinder form on the supporting part, the constant head tank has been seted up to the one side that lies in the opposite of holding surface on the supporting part, the axle bush is equipped with in the constant head tank embedding, the roller is installed in the axle bush, the locating surface has between holding surface and constant head tank on the supporting part, the locating surface is located the circumference side of holding surface, fixedly connected with separation blade on the locating surface, the spacing portion that has the protrusion holding surface on the separation blade, be provided with positioning slot between locating surface and the separation blade, positioning slot has the socket towards the roller, the location cutting has on the axle bush, the location cutting inserts in the positioning slot through the socket. This lever can guarantee the stopper dismouting and maintain convenient when improving stopper structural stability.

Description

Lever and disc brake

Technical Field

The invention belongs to the technical field of brakes, relates to a disc brake, and particularly relates to a lever on the disc brake.

Background

The braking system is a system that forcibly reduces the moving speed of the sporting goods. In vehicles, braking is generally performed by a brake, and the brake includes a disc brake, a drum brake, and the like.

Chinese patent document discloses a disc brake assembly for heavy-duty vehicles [ application No.: cn200810016315.X, publication No.: CN 101280814A ], which comprises a lever system, a self-adjusting system, a carrying system, and a friction pair, wherein the lever system and the self-adjusting system are disposed on the carrying system, the lever system is connected to the friction pair, and the self-adjusting system is further disposed between the friction pair and the lever system. The lever system comprises a half-moon bearing seat for mounting the lever, a widening lever assembly, a piston assembly and an integral push disc, the half-moon bearing is placed into the caliper body through the shaft hole in a matched and positioned mode, the widening lever assembly can freely rotate on the half-moon bearing seat through the half-moon bearing, the cylindrical pin is placed into an arc groove of the lever assembly, and a bushing is inlaid in the arc groove to guarantee free movement of the cylindrical pin. A sliding push rod is arranged in the piston assembly, and the integral push disc is fixed on the piston assembly; the self-adjusting system comprises a shifting fork shaft, an intermediate gear, a one-way clutch, an overload clutch shaft, a spring, an overload clutch and an overload clutch shell; the shifting fork shaft is connected with a sliding push rod and a piston of a piston assembly in a lever system through an overload clutch, a one-way clutch and an intermediate gear which are sequentially connected in a transmission way. The bearing system comprises a half-moon bearing seat and a shell in the lever system and is of a split type clamp structure.

The bush is also called a bearing bush, and the bearing bush is provided with a protruding part used for positioning the half-moon bearing. In order to facilitate the removal of the bearing bush for replacement and maintenance, a fixed structure is not usually arranged in the arc groove of the lever assembly. After disc brake equipment was accomplished, the outer peripheral face of cylindric lock supports and leans on the push rod, disc brake during operation, the lever assembly swings, the bearing produces pressure to the bulge of axle bush easily at lever assembly wobbling in-process semilunar bearing, because the axle bush does not have fixed knot to construct in the circular arc groove, the axle bush receives to take place circumference aversion behind the pressure easily, not only can influence the limiting displacement of axle bush bulge to semilunar bearing, and can arouse the effective contact surface reduction between axle bush and the circular arc groove, make the structural stability variation of cylindric lock and axle bush in the circular arc inslot, make disc brake's structural stability variation. But if pass through the tight fit with the axle bush and fix to the circular arc inslot, again lead to the axle bush to be difficult for taking out for the change of axle bush is maintained and is become very inconvenient, makes disc brake's dismouting maintain inconvenient.

Disclosure of Invention

The invention aims to provide a lever and disc brake aiming at the problems in the prior art, and solves the technical problem of how to improve the structural stability of the brake and ensure the brake to be convenient to disassemble, assemble and maintain.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a lever, includes lever body and roller, the supporting part has on the lever body, be provided with the holding surface that is the circular arc cylinder form on the supporting part, the constant head tank has been seted up to the one side that lies in the holding surface on the supporting part opposite, the axle bush is equipped with to the constant head tank embedded, the roller is installed in the axle bush, a serial communication port, the locating surface has on the supporting part between holding surface and constant head tank, the locating surface lies in the circumference side of holding surface, fixedly connected with separation blade on the locating surface, the spacing portion of protrusion holding surface has on the separation blade, be provided with the positioning slot between locating surface and the separation blade, the positioning slot has the socket towards the roller, the location cutting has on the axle bush, the location cutting inserts in the positioning slot through the socket.

The lever is installed in the disc brake, the roller pin of the half-moon bearing is pressed against the supporting surface of the supporting part in a rolling way, and the peripheral surface of the roller pin is pressed against the push rod. When the disc brake works, the lever rotates by taking the axis of the supporting surface as a rotation center. In the lever pivoted in-process, the semilunar bearing carries on spacingly in the spacing portion of holding surface through the separation blade epirelief, in order to prevent semilunar bearing roll-off holding surface, when semilunar bearing supports and leans on the spacing portion of separation blade to produce when supporting pressure, because separation blade fixed connection is on the lever body, support pressure can not arouse the removal of separation blade, make spacing portion on the separation blade to the limiting displacement of semilunar bearing remain stable, and support pressure can not also not use and make the axle bush take place the aversion on the axle bush, guarantee the axle bush installation stable, the location cutting on the axle bush inserts in the location slot between locating surface and the separation blade simultaneously, and the socket of location slot is towards the roller, make the location cutting can be fixed a position the lateral wall axial positioning and the circumferential location of slot on the supporting part, reduce the axle bush and take place the possibility of axial displacement and circumferential displacement, just also be favorable to guaranteeing the stability of roller installation, thereby the stability of stopper structure has been improved.

When the bearing bush needs to be replaced and maintained, the lever is firstly detached from the disc brake, and the roller does not abut against the push rod any more and automatically falls out of the positioning groove. Because the setting of location slot is between locating surface and separation blade, make the location slot be in the state of can disassembling, then can remove the circumference location of location cutting and easily take out the axle bush through following the separation blade is pulled down from the supporting part. Or after the lever is detached, the roller and the bearing bush are not limited by the push rod, and the socket faces the direction of the roller, so that the positioning insertion strip can be directly pulled out through the socket to detach the bearing bush. The two ways of disassembling the bearing bush can be selected according to the possibility of disassembly and assembly. And (5) replacing the old bearing bush and then reversely installing a new bearing bush. Therefore, the lever can improve the structural stability of the brake and ensure the brake to be conveniently disassembled, assembled and maintained.

In the above lever, the bearing bush is made of a metal material, the bearing bush includes a bearing bush body in the shape of an arc-shaped bush sheet, a notch is formed in one circumferential side edge of the bearing bush body, the bottom of the positioning insertion strip is integrally connected to the bottom surface of the notch, gaps are formed between two sides of the bottom of the positioning insertion strip and side wall surfaces of the notch, and the positioning insertion strip is bent towards the outer side of the bearing bush body.

The structure between location cutting and the axle bush body makes the location cutting have certain elasticity to make things convenient for the location cutting directly to insert from the socket and take out the location slot, avoided the dismouting of baffle when changing the axle bush, make the stopper dismouting maintain convenient.

In the above lever, the head of the positioning slip has a convex insertion head in an arc shape or a tapered shape. The head of the positioning insertion strip is conveniently inserted into the positioning slot from the socket, so that the bearing bush is conveniently mounted on the supporting part, and the brake is convenient to disassemble, assemble and maintain.

In the lever, the positioning surface is provided with a positioning notch communicated with the positioning groove, the blocking piece is blocked at the positioning notch, and the blocking piece and the wall surface of the positioning notch form the positioning slot in an enclosing manner. Therefore, the positioning inserting strip can be hidden in the positioning notch, the space occupied by the positioning inserting strip and the blocking piece on the positioning surface is reduced, the effective rotating space of the lever is ensured, and the working stability of the brake is ensured.

In the lever, one side of the positioning surface, which is close to the positioning groove, protrudes out of the side surface of the blocking piece, which is close to the positioning groove. The blocking piece and the positioning surface are installed in a staggered mode, so that the positioning inserting strips are conveniently inserted into and taken out of the positioning inserting grooves from the inserting openings, and the brake is convenient to disassemble, assemble and maintain.

In the lever, an axial surface is further arranged between the supporting surface and the positioning groove on the supporting part and located on the axial side of the supporting surface, one end of the positioning groove penetrates through the axial surface and forms an opening on the axial surface, and a limiting sheet blocking the opening is fixed on the axial surface. The limiting sheet has an axial limiting effect on the roller, so that the roller is stably installed in the positioning groove, and the brake is stable in structure.

In the lever, the limiting piece and the blocking piece are integrally formed, a bending connecting part is arranged between the limiting piece and the blocking piece, and a concave inlet is formed in the position, close to the bending connecting part, of the limiting piece. When the limiting sheet and the blocking sheet are processed, firstly, a mounting plate is punched and bent to form the limiting sheet and the blocking sheet, the concave opening has a positioning effect, and the limiting sheet and the blocking sheet are conveniently and accurately positioned and formed; meanwhile, the concave inlet also has the function of reducing stress concentration, so that the integral structure formed by the limiting sheet and the blocking sheet is stable, and the brake is favorable for being stable in structure.

In the lever, only one fastener is arranged between the blocking piece and the supporting part and between the limiting piece and the supporting part respectively. The fastener can be rivet or bolt or screw, and separation blade and spacing piece integrated into one piece back only set up a fastener respectively on separation blade and spacing piece, just can make the whole installation that separation blade and spacing piece formed stable on the supporting part, can also reduce the number of seting up the fastening hole that is used for installing the fastener on the supporting part simultaneously, reduces lever body manufacturing procedure, reduction in production cost.

In the above lever, two of the support parts are symmetrically arranged on two sides of the lever body, and each support part is provided with one support surface and the axes of the two support surfaces are collinear. Therefore, the lever is stressed uniformly and stably, and the brake is stable in structure.

The disc brake is characterized in that the disc brake further comprises the lever, the two supporting parts are arranged and correspond to the bearing seats one by one, the supporting parts are located between the corresponding bearing seats and the push rods, needle rollers of the half-moon bearings are attached to supporting surfaces of the corresponding supporting parts, and the roller is abutted to the corresponding push rods.

When the disc brake works, the lever rotates on the bearing seat by using the half-moon bearing, and the roller abuts against the push rod and pushes the push rod to move. The structure of lever can guarantee that the stopper dismouting is maintained conveniently when improving stopper structural stability.

Compared with the prior art, the invention has the following advantages:

the supporting part is arranged on the lever, the separation blade is fixed on the positioning face of the supporting part, the positioning slot is arranged between the separation blade and the positioning face, the socket of the positioning slot faces the roller, the bearing bush is installed in the positioning slot, and the positioning insertion strip of the bearing bush is inserted into the positioning slot through the socket, so that the lever can ensure that the brake is convenient to disassemble, assemble and maintain when the structural stability of the brake is improved. The axle bush body is connected in breach department with location cutting an organic whole, and has the clearance between the side wall face of location cutting and breach, the dismouting of the axle bush of being convenient for. Set up the location notch on the locating surface, the separation blade keeps off and forms the location slot in location notch department, avoids the setting of separation blade or fastener to cause the interference, guarantees lever pivoted stability. Spacing piece and separation blade of integrated into one piece, stable in structure and processing convenience.

Drawings

FIG. 1 is a perspective view of a lever according to a first embodiment;

FIG. 2 is a bottom view of the lever according to the first embodiment;

FIG. 3 isbase:Sub>A sectional view taken along line A-A of FIG. 2;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;

FIG. 5 is a perspective view of a lever body according to one embodiment;

figure 6 is a perspective view of a bearing shell according to a first embodiment;

FIG. 7 is a perspective view of a blocking piece and a limiting piece according to one embodiment;

FIG. 8 is a perspective view of a disc brake according to one embodiment;

FIG. 9 is a partial cross-sectional view of a lever support and a push rod of the disc brake according to one embodiment;

FIG. 10 is a perspective view of a lever and a push rod of a disc brake according to an embodiment;

FIG. 11 is a partial perspective view of the middle support portion of the embodiment with the stop piece and the limiting piece fixed thereon.

In the figure, 1, a clamp body; 1a, an installation part; 1b, a driving part; 1c, a bearing seat; 2. sealing the cover; 3. a bracket; 4. a first brake block; 5. a second brake block; 6. pushing the disc; 7. a half-moon bearing; 8. a spring; 9. a push rod; 10. a lever; 11. a lever body; 11a, a support portion; 11b, a support surface; 11c, a positioning groove; 11c1, an opening; 11d, a positioning surface; 11d1, a positioning notch; 11e, axial plane; 11f, a driving end; 12. a roller; 13. bearing bushes; 13a, positioning the cutting; 13a1, an insertion head; 13b, a bearing bush body; 13b1, a notch; 13c, a gap; 14. a baffle plate; 14a, a limiting part; 15. a limiting sheet; 15a, bending the connecting part; 15b, a recessed port; 16. positioning the slot; 16a, a socket; 17. a fastener.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1 to 11, the disc brake includes a caliper body 1 and a bracket 3, the caliper body 1 includes a mounting portion 1a, a driving portion 1b and a bridging portion connected between the mounting portion 1a and the driving portion 1b, the mounting portion 1a is mounted with a first brake pad 4, and the driving portion 1b is mounted with a driving assembly. The bracket 3 is connected with the driving part 1b in a sliding mode through a sliding pin, a mounting groove is formed in the bracket 3, and the second brake block 5 is mounted in the mounting groove in a sliding mode. The bracket 3 is fixedly connected to the vehicle frame, and the brake disc is arranged between the first brake block 4 and the second brake block 5. When the brake works, the driving assembly acts on the second brake block 5 to enable the second brake block 5 to approach to a brake disc, after the second brake block 5 abuts against the brake disc, the caliper body 1 slides along the sliding pin in the direction from the first brake block 4 to the second brake block 5, so that the first brake block 4 also abuts against the brake disc, and the brake disc is clamped by the first brake block 4 and the second brake block 5 to form braking.

The driving assembly comprises push rods 9 and a lever 10 which are installed in a driving part 1b, two bearing blocks 1c are arranged in an inner cavity of one side, far away from the second brake block 5, of the driving part 1b, a half-moon bearing 7 is installed on each bearing block 1c, and the two push rods 9 are arranged and correspond to the bearing blocks 1c one to one. The driving part 1b is provided with an installation opening towards one side of the second brake block 5, the installation opening is fixedly connected with a detachable sealing cover 2, and the sealing cover 2 is fixedly connected onto the driving part 1b through bolts. One end of the push rod 9 extends out of the sealing cover 2 and is fixedly connected with a push disc 6, and the push disc 6 can abut against the second brake block 5. A spring 8 is arranged between the push rod 9 and the cover 2, and the push rod 9 can move in a direction away from the second brake block 5, namely in a direction close to the bearing seat 1c under the action of the spring 8.

The lever 10 includes a lever body 11 and a roller 12, the lever body 11 is Y-shaped, one end of the lever body 11 has two supporting portions 11a, the two supporting portions 11a are symmetrically disposed on two sides of the lever body 11, and the other end of the lever body 11 is a driving end 11f. The two support portions 11a are arranged in one-to-one correspondence with the two bearing seats 1c, and each support portion 11a is located between the corresponding bearing seat 1c and the push rod 9. Each supporting portion 11a is provided with a supporting surface 11b in the shape of an arc cylindrical surface, the supporting surface 11b protrudes towards the corresponding bearing seat 1c, the needle roller of the half-moon bearing 7 abuts against the supporting surface 11b of the corresponding supporting portion 11a, and the axes of the two supporting surfaces 11b are collinear. And a positioning groove 11c is formed in the surface, opposite to the supporting surface 11b, of each supporting part 11a, a bearing bush 13 is embedded in the positioning groove 11c, the roller 12 is cylindrical, and the roller 12 is installed in the bearing bush 13. The wall surface of the positioning groove 11c is in a circular arc cylindrical surface shape, the circular arc angle of the positioning groove 11c is 90-160 degrees, can be 120-150 degrees or 130-150 degrees, generally selects 140 degrees, and the angle can not only ensure that the bearing bush 13 and the roller 12 are stably installed, but also ensure that the bearing bush 13 and the roller 12 are convenient to disassemble and assemble. The axis of the positioning groove 11c is parallel to the axis of the support surface 11b, and the axis of the roller 12 is parallel to the axis of the support surface 11b, so that the roller 12 is eccentrically mounted with respect to the axis of the support surface 11 b. A portion of the roller 12 protrudes out of the positioning groove 11c, and the outer circumferential surface of the roller 12 abuts on the end surface of the corresponding push rod 9 facing the bearing housing 1 c.

Each support portion 11a has a positioning surface 11d between the support surface 11b and the positioning groove 11c, and the positioning surface 11d is located on the circumferential side of the support surface 11 b. The positioning surface 11d is fixedly connected with a blocking piece 14, one side of the blocking piece 14 close to the supporting surface 11b is provided with a limiting part 14a protruding outwards from the supporting surface 11b, one side of the blocking piece 14 close to the positioning groove 11c is retracted inwards, namely, one side of the positioning surface 11d close to the positioning groove 11c protrudes out of the side surface of the blocking piece 14 close to the positioning groove 11 c. A positioning slot 16 is arranged between the positioning surface 11d and the baffle plate 14, the positioning slot 16 is provided with a socket 16a facing the roller 12, the bearing bush 13 is provided with a positioning insert 13a, and the positioning insert 13a is inserted into the positioning slot 16 through the socket 16 a. The positioning surface 11d is provided with a positioning notch 11d1 communicated with the positioning groove 11c, the blocking piece 14 is blocked at the positioning notch 11d1, and the blocking piece 14 and the wall surface of the positioning notch 11d1 enclose a positioning slot 16.

The bearing shell 13 is made of a metal material, such as carbon steel such as Q235 and Q245, or a copper alloy. The bearing bush 13 includes the bearing bush body 13b that is the circular arc tile piece, and one of them circumference side reason of bearing bush body 13b has breach 13b1, and the bottom an organic whole of location cutting 13a is connected on the bottom surface of breach 13b1, and all has clearance 13c between the both sides of location cutting 13a bottom and the lateral wall face of breach 13b1, and location cutting 13a is buckled and is inserted into location slot 16 to the outside of bearing bush body 13 b. The head of the positioning insert 13a has a convex arc-shaped or tapered insertion head 13a1, and the insertion head 13a1 is semicircular in shape in this embodiment.

Each support portion 11a also has an axial face 11e on it between the support face 11b and the positioning slot 11c, the axial face 11e being located axially to the support face 11b, both axial faces 11e being disposed outwardly on the lever body 11. The outer end of each positioning groove 11c penetrates through the corresponding axial surface 11e and forms an opening 11c1 on the axial surface 11e, a limiting piece 15 which is blocked at the opening 11c1 is fixed on each axial surface 11e, and the limiting piece 15 is used for limiting the axial displacement of the roller 12. The limiting piece 15 and the blocking piece 14 are integrally formed, a bending connecting part 15a is arranged between the limiting piece 15 and the blocking piece 14, and a concave opening 15b is arranged on the limiting piece 15 at a position close to the bending connecting part 15 a. Only one fastener 17 is arranged between the blocking piece 14 and the supporting part 11a and between the limiting piece 15 and the supporting part 11a, and the fastener 17 can be a rivet or a bolt or a screw, namely, the blocking piece 14 is fixed on the positioning surface 11d only by one rivet or bolt or screw, and the limiting piece 15 is fixed on the positioning surface 11d only by one rivet or bolt or screw.

The driving assembly further includes a driving source [ not shown in the drawings ], the driving source may be an air cylinder or an oil cylinder, the air cylinder is generally selected, and a disc brake using the air cylinder is called an air disc brake, and a piston rod of the air cylinder extends out and abuts against the driving end 11f of the lever body 11. When the disc brake works, the cylinder drives the lever body 11 to rotate by taking the axis of the supporting surface 11b as a rotation center, the roller 12 abuts against the push rod 9 to enable the push rod 9 to drive the second brake block 5 and the caliper body 1 to move, and the first brake block 4 and the second brake block 5 clamp the brake disc to form braking. After braking is finished, the piston rod of the air cylinder retracts, the push rod 9 moves towards the direction far away from the second brake block 5 under the action of the spring 8, and the lever 10 resets.

During the rotation of the lever body 11, the half-moon bearing 7 is limited by the limiting part 14a protruding out of the supporting surface 11b from the baffle plate 14, so as to prevent the half-moon bearing 7 from slipping out of the supporting surface 11b, when the half-moon bearing 7 abuts against the limiting part 14a of the baffle plate 14 to generate abutting force, since the baffle plate 14 is fixedly connected to the lever body 11, the abutting force does not cause the movement of the baffle plate 14, so that the limiting effect of the limiting part 14a on the baffle plate 14 on the half-moon bearing 7 is kept stable, and the abutting force does not act on the bearing bush 13 to cause the displacement of the bearing bush 13, so that the bearing bush 13 is stably installed, meanwhile, the positioning insert 13a on the bearing bush 13 is inserted into the positioning slot 16 between the positioning surface 11d and the baffle plate 14, while the socket 16a of the positioning slot 16 faces the roller 12, i.e. the positioning insert 13a is embedded in the positioning slot 11d1, two side surfaces of the positioning insert 13a are limited and form axial positioning, so as to form axial positioning, so that the bottom surfaces and the positioning insert 13a are limited and form axial positioning slot structures, thereby the circumferential positioning stability of the positioning insert 13a is improved, and the axial positioning slot 13a side wall structure is also can be beneficial for ensuring the circumferential positioning stability of the axial positioning slot 12.

When the bearing bush 13 needs to be replaced and maintained, the sealing cover 2 is firstly detached from the caliper body 1, then the push rod 9 and the lever 10 are taken out from the driving part 1b of the caliper body 1, and the roller 12 is not abutted against the push rod 9 any more and automatically falls out from the positioning groove 11 c. Since the positioning insertion groove 16 is provided between the positioning surface 11d and the stopper piece 14, the positioning insertion groove 16 is in a detachable state, and then the bearing bush 13 can be easily taken out by releasing the circumferential positioning of the positioning insertion piece 13a after the stopper piece 14 is detached from the support portion 11 a. Meanwhile, the insertion opening 16a faces the direction of the roller 12, and the angle of the positioning groove 11c and the structure of the bearing bush 13 are arranged, so that the bearing bush 13 can be directly detached, and after the lever 10 is taken out and the roller 12 and the bearing bush 13 are not limited by the push rod 9, the positioning insertion strip 13a can be directly pulled out through the insertion opening 16a to detach the bearing bush 13 without detaching the baffle 14. The two types of the ways of removing the bearing bush 13 can be selected according to the possibility of disassembly, for example, the blocking piece 14 or the blocking piece 14 is provided with a rivet, so that when the blocking piece 14 is not easy to remove, the positioning insertion strip 13a can be directly pulled out, and if the blocking piece 14 is convenient to remove, the bearing bush 13 can be taken out after the blocking piece 14 is removed. And replacing the old bearing bush 13 and then reversely installing the new bearing bush 13. Therefore, the lever 10 can improve the structural stability of the brake and ensure the convenience of dismounting and maintaining the brake.

Example two

The structure of the positioning slot 16 is different from that of the first embodiment, the blocking piece 14 and the limiting piece 15 are separate structures, and other structures are the same as those of the first embodiment. The baffle plate 14 is provided with a positioning groove, and a positioning slot 16 is defined by the wall surface of the positioning groove and the positioning surface 11 d. The separation blade 14 is fixedly connected to the positioning surface 11d through at least two rivets or bolts or screws, and the limiting sheet 15 is fixedly connected to the axial surface 11e through at least two rivets or bolts or screws, so that the separation blade 14 and the limiting sheet 15 are fixed stably on the supporting portion 11a, and the structural stability of the brake is guaranteed.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A lever comprises a lever body (11) and a roller (12), wherein a supporting portion (11 a) is arranged on the lever body (11), a supporting surface (11 b) in the shape of an arc cylindrical surface is arranged on the supporting portion (11 a), a positioning groove (11 c) is formed in one surface, opposite to the supporting surface (11 b), of the supporting portion (11 a), a bearing bush (13) is embedded in the positioning groove (11 c), and the roller (12) is installed in the bearing bush (13), the lever is characterized in that a positioning surface (11 d) is arranged on the supporting portion (11 a) and between the supporting surface (11 b) and the positioning groove (11 c), the positioning surface (11 d) is arranged on the circumferential side of the supporting surface (11 b), a limiting portion (14 a) protruding out of the supporting surface (11 b) is fixedly connected to the positioning surface (11 d), a positioning slot (16) is formed between the positioning surface (11 d) and the blocking piece (14), a positioning slot (16) is formed in the positioning slot (16) and is formed in the bearing bush (11 d), a socket (13 a) facing the roller (12), a positioning strip (13 a plug is inserted into a notch (13 b), a positioning slot (13 b) is formed in the bearing bush body, and a sheet-shaped positioning slot (13 b) is inserted into the positioning slot (13 b), and a strip (13 b) is inserted into the positioning slot (16), and a notch (13 b) is formed in the positioning slot (13 b), and a notch (13 b) is formed in the positioning slot (13 b), and a slot (13 b) is inserted into the positioning slot (13 b) The bottom of the positioning insertion strip (13 a) is integrally connected to the bottom surface of the notch (13 b 1), gaps (13 c) are formed between two sides of the bottom of the positioning insertion strip (13 a) and the side wall surface of the notch (13 b 1), and the positioning insertion strip (13 a) bends towards the outer side of the bearing bush body (13 b).

2. A lever according to claim 1, wherein the bearing shell (13) is made of a metallic material.

3. The lever according to claim 1, wherein the head of the positioning insert (13 a) has a convex insertion head (13 a 1) with a circular arc shape or a conical shape.

4. The lever according to claim 1, wherein the positioning surface (11 d) is provided with a positioning recess (11 d 1) communicated with the positioning groove (11 c), the blocking piece (14) is blocked at the positioning recess (11 d 1), and the blocking piece (14) and the wall surface of the positioning recess (11 d 1) enclose the positioning slot (16).

5. A lever according to claim 1, wherein the side of the positioning surface (11 d) adjacent to the positioning slot (11 c) protrudes beyond the side of the flap (14) adjacent to the positioning slot (11 c).

6. A lever according to any one of claims 1 to 5, wherein the support portion (11 a) further has an axial surface (11 e) between the support surface (11 b) and the positioning groove (11 c), the axial surface (11 e) is located on the axial side of the support surface (11 b), one end of the positioning groove (11 c) penetrates through the axial surface (11 e) and forms an opening (11 c 1) on the axial surface (11 e), and the axial surface (11 e) is fixed with a limiting piece (15) blocked at the opening (11 c 1).

7. A lever according to claim 6, wherein the position-limiting piece (15) and the blocking piece (14) are integrally formed, a bent connecting portion (15 a) is arranged between the position-limiting piece (15) and the blocking piece (14), and a concave inlet (15 b) is arranged on the position-limiting piece (15) and close to the bent connecting portion (15 a).

8. A lever according to claim 7, wherein only one fastener (17) is provided between the blocking tab (14) and the support portion (11 a) and between the limiting tab (15) and the support portion (11 a), respectively.

9. A lever according to any one of claims 1 to 5, wherein two of said support portions (11 a) are symmetrically arranged on either side of the lever body (11), one of said support surfaces (11 b) being arranged on each support portion (11 a) and the axes of the two support surfaces (11 b) being collinear.

10. A disc brake, including the pincers body (1), be provided with two bearing frames (1 c) on the pincers body (1), all install semilunar bearing (7) on each bearing frame (1 c), install push rod (9) that set up with bearing frame (1 c) in the pincers body (1), characterized by that, disc brake still includes the lever of any claim 1-8, the supporting part (11 a) have two and set up with bearing frame (1 c) one-to-one, the supporting part (11 a) is located between corresponding bearing frame (1 c) and push rod (9), the kingpin of semilunar bearing (7) pastes and leans on the holding surface (11 b) of corresponding supporting part (11 a), roller (12) lean on corresponding push rod (9).