Brake pad support balance guide mechanism suitable for disc brake

Abstract

The brake pad support balance guide mechanism comprises a guide rail base, a guide piece and a connecting rod connecting the guide rail base and the guide piece, and the guide rail base is provided with a sliding rail arranged in the direction perpendicular to the disc face of a brake disc; the guide piece is fixed to the brake pad holder and provided with a guide hole parallel to the brake applying face of the brake pad holder and forming an included angle with the brake pad holder pin. The connecting rod is provided with a first end slidably supported in the guide rail seat sliding rail and a second end inserted into the guide hole of the guide piece, and the second end of the connecting rod is slidably matched with the guide hole; the guide hole is limited by the second end of the connecting rod so as to be parallel to the brake pad holder brake applying face, and the brake pad holder brake applying face is parallel to the brake disc face. According to the disc brake, the brake pad holder balance guide mechanism is arranged, it can be guaranteed that the brake applying face of the brake pad holder applies braking in the posture perpendicular to the braking force direction all the time, and the problem that in the application process, the brake pad collides with the brake pad, and consequently the brake pad is eccentrically abraded is effectively solved.

Description

Technical Field

[0001] This patent relates to a brake pad support balancing guide mechanism suitable for disc brakes, belonging to the technical field of vehicle braking equipment. Background Art

[0002] The hydraulic brake caliper is one of the basic brake devices used in rail transit vehicles. It is mostly used in rail transit vehicles with medium and low traffic. Its brake pad holder is connected to the hydraulic brake caliper through a pin shaft. The brake pad holder can rotate around the pin shaft without other fixed constraints. When the vehicle is running, the brake pad holder may contact or collide with the brake pad due to vibration and impact, generating noise; during the braking process, the brake pad holder may deflect when pushing the brake pad to clamp, causing eccentric wear of the brake pad, reducing the service life of the brake pad and affecting the braking performance.

[0003] Brake pad support anti-deflection mechanisms are widely used in pneumatic brake caliper units. The brake pad support assembly of the three-point suspension brake caliper unit is connected to the bogie, which can limit the deflection of the brake pad support; the four-point compact suspension brake caliper unit has a variety of brake pad support anti-deflection mechanisms. The article "Analysis of Anti-Wear Mechanisms of 4-Point Compact Brake Caliper Units" published in the 6th issue of "Locomotive and Rolling Stock Technology" magazine in 2018 introduces three anti-deflection mechanisms: guide rod type, balance rod type and guide rail type.

[0004] The structure and bogie mounting form of the hydraulic brake caliper are quite different from those of the pneumatic brake caliper unit, so it is necessary to provide a brake pad support balancing guide mechanism suitable for the hydraulic brake caliper. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a brake pad support balancing guide mechanism suitable for a disc brake, which guides the braking action of the brake pad support to avoid the problem of eccentric wear of the brake pad caused by its deflection, and at the same time limits the free posture of the brake pad support in the relief state to prevent contact or collision with the brake pad.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a brake pad support balancing guide mechanism suitable for a disc brake, comprising: a guide rail seat, a guide member and a connecting rod connecting the two, wherein the guide rail seat is fixed to the brake seat body, and has a slide rail arranged perpendicular to the direction of the brake disc surface; the guide member is fixed to the brake pad support or a transition member on the brake pad support, and has a linear guide hole parallel to the brake pad support brake application surface and at an angle to the brake pad support pin; the connecting rod has a first end slidably supported in the guide rail of the guide rail seat and a second end inserted into the guide hole of the guide member, and the second end of the connecting rod is slidably matched with the guide hole; The guide hole is limited by the second end of the connecting rod to keep it parallel to the brake pad support brake application surface, so that the brake pad support brake application surface is parallel to the brake disc surface.

[0007] Preferably, the guide hole and the slide rail of the guide rail seat are arranged nearly vertically, so that the brake pad holder can be better guided so that the brake application surface of the brake pad holder remains parallel to the brake disc surface.

[0008] Furthermore, in the brake pad support balancing guide mechanism of the present invention, the brake pad support pin is arranged along the Z-axis direction, the slide rail of the guide rail seat is arranged along the Y-axis direction, the second end of the connecting rod and the guide hole are arranged along the X-axis direction, the X-axis direction, the Y-axis direction and the Z-axis direction are orthogonal to each other, and the guide hole is limited in the X-axis direction by the second end of the connecting rod, so that the brake application surface of the brake pad support remains parallel to the brake disc surface. Preferably, a compressed elastic member is provided between the second end of the connecting rod and the guide hole.

[0009] Specifically, the elastic member is a spring sleeved on the second end of the connecting rod, the bottom of the guide hole has a spring seat, and the outer end of the spring is sleeved on the spring seat; or the elastic member is an elastic rubber, and the two ends of the elastic rubber respectively abut against the bottom of the guide hole and the head of the second end of the connecting rod. The spring provides a spring force parallel to the axis of the guide hole (X direction) for the balance guide mechanism. During the braking process, the spring is gradually compressed and the spring force gradually increases.

[0010] In order to facilitate the low-resistance movement of the connecting rod, the first end of the connecting rod of the present invention is slidably supported in the slide rail of the guide rail seat through a roller.

[0011] Furthermore, the guide rail seat has an open groove structure, the slide rail is located at the bottom of the open groove, the two end faces of the opening of the open groove are parallel to the slide rail and are located on the same plane, and a limit plate is also provided at the first end of the connecting rod. When the first end of the connecting rod is perpendicular to the slide rail, the end face of the limit plate is parallel to the opening of the open groove and is a clearance fit.

[0012] In the balancing guide mechanism of the present invention, the first end of the connecting rod is slidably supported in the guide rail of the guide rail seat, and the second end of the connecting rod is pressed into the guide hole of the brake pad support guide member through the elastic member, and can slide axially in the guide hole, and make the brake pad support and the connecting rod keep the same action posture in the braking force direction. In the initial release state of the brake caliper, the connecting rod and the elastic member have a certain pre-compression spring force. After the balancing guide mechanism is assembled, the limit plate is parallel to the guide rail seat and is a clearance fit, and the limit plate can prevent the balancing guide mechanism from deflecting.

[0013] The brake caliper is equipped with a brake pad support balancing guide mechanism to ensure that the brake application surface of the brake pad support always applies brakes in a posture perpendicular to the direction of the braking force, that is, the brake application surface of the brake pad support is always parallel to the brake disc surface, effectively avoiding the problem of collision with the brake pad and eccentric wear of the brake pad that may occur during use.

[0014] The present invention has the following characteristics: The roller greatly reduces the sliding resistance between the connecting rod and the slide rail in the balancing guide mechanism, avoiding jamming of the mechanism when it moves along the track; the limit plate added to the connecting rod cooperates with the guide rail seat to avoid deflection of the brake pad support; the spring force provided by the spring can prevent the first end (upper end) of the connecting rod from detaching from the guide rail seat.

[0015] In addition, the present invention also claims protection for a brake, including a brake seat, a lever hinged to the brake seat, and a brake pad support hinged to the front end of the lever via a brake pad support pin, characterized in that it has the aforementioned brake pad support balancing guide mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the brake pad support balancing guide mechanism of the present invention applied to a hydraulic brake caliper.

[0017] Figure 2 It is an exploded view of the brake pad support balancing guide mechanism of the present invention.

[0018] Figure 3 This is a schematic diagram of the principle of the brake pad support balance guide mechanism of the present invention. Explanation of the accompanying drawings: 1-brake pad support; 2-spring; 3-connecting rod; 4-roller; 5-guide rail seat; 6-brake seat body; 7-lever; 8-brake pad support pin; 9-limiting plate; 10-guide member; 101-guide hole; A-lever rotation center point; B-brake pad support rotation point around the brake pad support pin; a-point B rotation trajectory; b-brake pad support balance guide mechanism X-axis direction movement trajectory; c-brake pad support balance guide mechanism Y-axis direction movement trajectory. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] like Figure 1 , Figure 2 As shown, a disc brake comprises a brake seat body 6, a lever 7 hinged to the brake seat body 6, a brake pad support 1 hinged to the front end of the lever 7 via a brake pad support pin 8, and a brake pad support balancing guide mechanism according to an embodiment of the present invention.

[0021] The embodiment of the present invention is applicable to the brake pad support balance guide mechanism of the disc brake, including: a guide rail seat 5, a guide member 10 and a connecting rod 3. Among them, the guide rail seat 5 is fixed on the top of the brake seat body 6, and has a slide rail arranged perpendicular to the direction of the brake disc surface. Of course, the guide rail seat 5 can also be set on the brake seat body 6 at the lower part of the guide pin, and the specific installation position can be selected according to the installation space. The guide member 10 is fixed to the back of the brake pad support 1, and has a linear guide hole 101 parallel to the brake application surface of the brake pad support 1 and perpendicular to the brake pad support pin 8. Specifically, in this example, a cylindrical protrusion structure is cast on the back of the brake pad support 1, one side of the cylindrical protrusion structure is sealed, and the other side is open and has a machined circular deep hole. The brake pad support 1 applies the braking force transmitted by the brake caliper lever to the brake pad back plate to achieve braking. The connecting rod 3 has a first end slidably supported in the slide rail of the guide rail seat 5 and a second end inserted into the guide hole 101 of the guide member 10, and the second end of the connecting rod 3 is slidably matched with the guide hole 101. As Figure 1 As shown, in this embodiment, the brake pad support pin 8 is arranged along the z-axis direction, the slide rail of the guide rail seat 5 is arranged along the y-axis direction, and the second end of the connecting rod 3 and the guide hole 101 are arranged along the x-axis direction, wherein the x-axis direction, the y-axis direction and the Z-axis direction are orthogonal to each other. Since the brake pad support pin 8 moves in an arc around the lever axis during the braking process, the position of the brake pad support 1 relative to the brake seat body 6 in the x-axis direction is changed, so the second end of the connecting rod 3 and the guide hole 101 must be slidable. The guide hole 101 is limited by the second end of the connecting rod 3 to keep it parallel to the brake application surface of the brake pad support 1, so that the brake application surface of the brake pad support 1 is parallel to the brake disc surface.

[0022] In principle, the presence of an angle between the guide hole 101 and the brake pad support pin 8 can achieve the limit of the brake pad support 1. This is because the brake pad support 1 is rotatable around the axial direction of the brake pad support pin 8. When there is a limit position that is not parallel to the brake pad support pin 8, the brake pad support 1 is locked and cannot rotate around the brake pad support pin 8, thereby achieving locking.

[0023] In this example, the guide member 10 is located at the back of the brake pad holder 1, and the connecting rod 3 is Z-shaped. As another feasible solution, a transition member is provided above the brake pad holder 1, and the guide member 10 is provided on the transition member, so that the guide member 10 and the guide rail seat 5 are located at the same height, and at this time, the connecting rod 3 can adopt a horizontally arranged linear structure. Of course, when the guide member 10 and the guide rail seat 5 are not at the same height, the connecting rod 3 still adopts a linear structure, and at this time, the guide holes of the connecting rod 3 and the guide member 10 need to be set obliquely. It can be set according to the situation of the brake. When the connecting rod 3 and the guide member 10 adopt an oblique setting scheme, the total length of the connecting rod 3 can be shortened, making the entire balance guide mechanism more compact.

[0024] In order to ensure that the first end of the connecting rod 3 can be stably supported on the slide rail of the guide rail seat 5, a compressed elastic member is provided between the second end of the connecting rod 3 and the guide hole 101. Figure 1 , Figure 2 In the embodiment shown, the elastic member is a spring 2 sleeved on the second end of the connecting rod 3. The spring 2 is a cylindrical spring. The bottom of the guide hole 101 has a spring seat, and the outer end of the spring 2 is sleeved on the spring seat, so that the spring 2 is compressed between the spring seat and the second end of the connecting rod 3, so that the connecting rod 3 can be continuously subjected to the reverse thrust of the spring 2, ensuring that the first end of the connecting rod 3 can be more stably supported on the slide rail of the guide rail seat 5. In this example, the balancing guide mechanism provides a spring force parallel to the axis of the circular hole. During the braking process, the spring 2 is gradually compressed and the spring force gradually increases. As an alternative, the elastic member is made of elastic rubber, and the two ends of the elastic rubber respectively abut against the bottom of the guide hole 101 and the head of the second end of the connecting rod 3.

[0025] In this embodiment, the connecting rod 3 is a round rod structure, and the second end (lower end) of the connecting rod 3 is against the spring 2 and pressed in the guide hole 101 (a round hole with a cylindrical protrusion feature) of the brake pad holder 1. It can slide axially in the guide hole 101, and make the brake pad holder 1 and the connecting rod 3 keep the same action posture in the braking force direction. In the initial release state of the hydraulic brake caliper, the connecting rod and the spring have a certain pre-compression spring force. The first end (upper end) of the connecting rod 3 is supported on the slide rail of the guide rail seat 5 through the roller 4. Specifically, a threaded hole is opened on the head of the first end of the connecting rod 3, one end of the roller 4 is a ball, and the other end is a screw structure. The first end of the connecting rod 3 is fixed to the roller 4 by a threaded connection, and the ball of the roller 4 is against the slide rail of the guide rail seat 5. During the braking and release process, the ball rolls on the slide rail, so that the connecting rod 3 in the balance guide mechanism slides with low resistance in the direction of the braking force application. The spring force provided by the spring 2 presses the connecting rod 3 and the roller 4 onto the slide rail (bottom surface of the groove) of the guide rail seat 5, preventing the connecting rod 3 and the roller 4 from being separated from the slide rail of the guide rail seat 5 during operation. The nearly vertical arrangement of the guide hole 101 and the slide rail of the guide rail seat 5 can ensure that the elastic force of the spring can more fully act on the connecting rod 3, preventing the first end of the connecting rod 3 from being separated from the guide rail seat 5.

[0026] In this example, both ends of the guide rail seat 5 are flat plate structures, each of which is provided with through holes for mounting bolts, and is fixed to the brake caliper (brake seat body) by bolts. The middle part of the guide rail seat has an open groove structure, and the opening direction is toward the x-axis direction, that is, parallel to the guide hole 101. The slide rail is located at the bottom of the open groove, and the track formed by the groove is a straight line parallel to the braking force direction, so that the balance guide mechanism slides along the track. The two end faces of the opening of the groove are parallel to the slide rail and located on the same plane. The first end of the connecting rod 3 is also provided with a limit plate 9. When the first end of the connecting rod 3 is perpendicular to the slide rail, the end face of the limit plate 9 is parallel to the opening of the groove and is a clearance fit. The limit of the limit plate 9 can avoid the deflection of the brake pad support.

[0027] like Figure 3 As shown, the lever 7 can rotate around point A, and the motion trajectory of point B where the brake pad support 1 and the brake pad support pin 8 are connected is a. When the brake caliper applies the brake, the movement of the brake pad support 1 along the lever along the trajectory a can be divided into a translation along the direction parallel to the x-axis and a translation along the direction parallel to the y-axis. The former causes the spring 2 to continue to compress in the direction of trajectory b to provide spring force, and the latter causes the connecting rod 3 and the roller 4 to slide along the trajectory c with low resistance. The rectangular step of the connecting rod 3 fixes the posture of the brake pad support 1, thereby ensuring that the braking force application surface is always in contact with the brake pad support 1. Figure 3 The y-axis direction is vertical. When the hydraulic brake caliper is restored to the relieved state, the above parts are restored to the relieved state according to the reverse action.

[0028] The brake of the present invention ensures that the brake pad support brake application surface always applies the brake in a posture perpendicular to the braking force direction by providing a brake pad support balance guide mechanism, effectively avoiding the problem of collision with the brake pad and uneven wear of the brake pad that may occur during use.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A brake pad support balancing guide mechanism suitable for a disc brake, comprising: - a guide rail seat (5), fixed to the brake seat body (6), having a guide rail arranged perpendicular to the direction of the brake disc surface; - a guide member (10), fixed to the brake pad support (1) or a transition member on the brake pad support (1), having a linear guide hole (101) parallel to the brake application surface of the brake pad support (1) and at an angle to the brake pad support pin (8); and - a connecting rod (3), comprising a first end slidably supported in a slide rail of a guide rail seat (5) and a second end inserted into a guide hole (101) of the guide member (10), the second end of the connecting rod (3) being slidably engaged with the guide hole (101); The guide hole (101) is limited by the second end of the connecting rod (3) to remain parallel to the brake application surface of the brake pad holder (1), so that the brake application surface of the brake pad holder (1) is parallel to the brake disc surface.

2. The brake pad support balancing guide mechanism for a disc brake according to claim 1, characterized in that: The guide hole (101) and the slide rail of the guide rail seat (5) are arranged nearly vertically.

3. The brake pad support balancing guide mechanism for a disc brake according to claim 1, characterized in that: The brake pad support pin (8) is arranged along the Z-axis direction, the slide rail of the guide rail seat (5) is arranged along the Y-axis direction, the second end of the connecting rod (3) and the guide hole (101) are arranged along the X-axis direction, the X-axis direction, the Y-axis direction and the Z-axis direction are orthogonal to each other, and the guide hole (101) is limited in the X-axis direction by the second end of the connecting rod (3), so that the brake application surface of the brake pad support (1) remains parallel to the brake disc surface.

4. The brake pad support balancing guide mechanism for a disc brake according to claim 1, characterized in that: The guide member (10) is located at the back of the brake pad support (1).

5. The brake pad support balancing guide mechanism for a disc brake according to claim 1, characterized in that: A compressed elastic member is provided between the second end of the connecting rod (3) and the guide hole.

6. The brake pad support balancing guide mechanism for a disc brake according to claim 5, characterized in that: The elastic member is a spring sleeved on the second end of the connecting rod (3); the bottom of the guide hole (101) has a spring seat, and the outer end of the spring is sleeved on the spring seat; or the elastic member is an elastic rubber, and the two ends of the elastic rubber respectively abut against the bottom of the guide hole (101) and the head of the second end of the connecting rod (3).

7. The brake pad support balancing guide mechanism for a disc brake according to claim 1, characterized in that: The first end of the connecting rod (3) is slidably supported in the slide rail of the guide rail seat (5) via a roller (4).

8. The brake pad support balancing guide mechanism for a disc brake according to claim 1, characterized in that: The guide rail seat (5) has an open groove structure, the slide rail is located at the bottom of the open groove, the two end faces of the opening of the open groove are parallel to the slide rail and are located on the same plane, and the first end of the connecting rod (3) is also provided with a limit plate (9), when the first end of the connecting rod (3) is perpendicular to the slide rail, the end face of the limit plate (9) is parallel to the opening of the open groove and is clearance-matched.

9. The brake pad support balancing guide mechanism for a disc brake according to claim 1, characterized in that: The connecting rod (3) is Z-shaped or straight-line-shaped.

10. A brake, comprising a brake seat (6), a lever (7) hinged to the brake seat (6), and a brake pad support (1) hinged to the front end of the lever (7) via a brake pad support pin (8), characterized in that: A brake pad support balancing guide mechanism is provided.

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