CN216691961U

CN216691961U - Push rod mechanism of disc brake

Info

Publication number: CN216691961U
Application number: CN202220176640.8U
Authority: CN
Inventors: 郭海广; 李瑞栋; 张永杰
Original assignee: Hebei Aiste Vehicle And Bridge Co ltd
Current assignee: Hebei Aiste Vehicle And Bridge Co ltd
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2022-06-07
Anticipated expiration: 2032-01-21

Abstract

The utility model provides a push rod mechanism of a disc brake, which is used for converting the rotary motion of a ramp gear into linear motion so as to push a brake disc and comprises a main push rod, a bearing and a side limiting roller; the main push rod comprises an abutting section positioned at the upper part of the main push rod, a stroke section positioned at the middle part of the main push rod and a bearing connecting section positioned at the bottom of the main push rod; the abutting section, the stroke section and the bearing connecting section are of straight rod structures, and the cross section shapes and the cross section sizes of the abutting section, the stroke section and the bearing connecting section are the same; the bearing connecting section of the main push rod is provided with an inwards concave bearing chamber, and a pair of side walls of the bearing connecting section are provided with through holes at positions close to the bottom; the bearing is arranged in the bearing chamber through a pin shaft; one end of the pin shaft is flush with one side surface of the main push rod, the other end of the pin shaft extends out of the other side surface of the main push rod, and the side limiting idler wheel is arranged on a shaft section of the pin shaft, which extends out of the other side surface of the main push rod. The structure enables the structure of the transmission device of the disc brake to be as compact as possible, and is beneficial to reducing the whole volume of the transmission device.

Description

Push rod mechanism of disc brake

Technical Field

The utility model relates to the field of brake discs, in particular to a push rod mechanism of a disc brake.

Background

The rotating element in a friction pair of a disc brake is a metal disc working with end faces, called a brake disc. The friction elements grip the brake disc from both sides to produce braking. The fixing elements have various structural forms, and can generally divide the disc brake into a caliper disc type and a full disc type. The fixed and rotating elements of an all-disc brake friction pair are disc-shaped, referred to as fixed and rotating discs, respectively. All the working surfaces of the brake disc can be simultaneously contacted with the friction plates, and the structure principle of the brake disc is similar to that of a friction clutch.

The spiral force-increasing mechanism is less applied to the disc brake, and in the prior art shown in fig. 7, the brake has more components, larger length and larger occupied space. How to reduce the length of the brake and reduce the occupied space is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

Accordingly, embodiments of the present invention provide a tappet mechanism for a disc brake, which obviates or mitigates one or more of the disadvantages of the related art.

The technical scheme of the utility model is as follows:

the push rod mechanism is used for converting the rotary motion of the ramp gear into linear motion so as to push the brake disc, and comprises a main push rod, a bearing and a side limiting roller; the main push rod comprises an abutting section positioned at the upper part of the main push rod, a stroke section positioned at the middle part of the main push rod and a bearing connecting section positioned at the bottom of the main push rod; the abutting section, the stroke section and the bearing connecting section are of straight rod structures, and the cross section shapes and the cross section sizes of the abutting section, the stroke section and the bearing connecting section are the same; the bearing connecting section of the main push rod is provided with an inward-recessed bearing chamber, and a pair of side walls of the bearing connecting section are provided with through holes at positions close to the bottom; the bearing is arranged in the bearing chamber through a pin shaft penetrating the through hole, and the highest point of the peripheral surface of the bearing protrudes out of the bearing chamber; one end of the pin shaft is flush with one side face of the main push rod, the other end of the pin shaft extends out of the other side face of the main push rod, and the side limiting idler wheel is installed on a shaft section of the pin shaft, extending out of the other side face of the main push rod.

In some embodiments, the cross section of the main push rod is a rectangle with a pair of circular arcs.

In some embodiments, the side limiting roller is mounted on the pin shaft through a shaft sleeve, the inner side of the side limiting roller is positioned through a shaft shoulder of the pin shaft, and the outer side of the side limiting roller is positioned through an elastic check ring mounted on the pin shaft.

In some embodiments, the abutting portion of the main push rod and the stroke portion are provided with annular grooves.

In some embodiments, the abutment section and the stroke section of the main push rod have axially arranged hollows.

In some embodiments, the outer edge portion of the top surface of the abutment section of the main push rod has a chamfer or fillet.

In some embodiments, the bearing connecting section of the main push rod has a bulge part thickened downwards at the position where the through hole is formed.

In some embodiments, the pin has a first pin hole along a radial direction thereof, and the wall portion of one side of the bearing connecting section has a corresponding second pin hole, and the pin is fixedly connected with the bearing connecting section through a pin or an elastic rolling sheet installed in the two pin holes.

In some embodiments, the bearing is a needle bearing.

According to the push rod mechanism of the disc brake, the beneficial effects at least comprising the following steps are obtained:

(1) the push rod mechanism carries out thickening design on each part of the main push rod, keeps the thickness of the periphery consistent, enhances the strength of the push rod mechanism, cancels a step structure for limiting the working stroke of the main push rod 10, has unlimited length of the working stroke and increases as much as possible, theoretically can reach the position close to the near-side limiting roller wheel, and is beneficial to reducing the length of the whole main push rod, so that the structure of the transmission device of the disc brake is compact as much as possible, and the whole volume of the transmission device is favorably reduced.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

It will be appreciated by those skilled in the art that the objects and advantages that can be achieved with the present invention are not limited to the specific details set forth above, and that these and other objects that can be achieved with the present invention will be more clearly understood from the detailed description that follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the principles of the utility model. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the utility model. For purposes of illustrating and describing some portions of the present invention, corresponding parts of the drawings may be exaggerated, i.e., may be larger, relative to other components in an exemplary apparatus actually manufactured according to the present invention. In the drawings:

fig. 1 is a schematic perspective view of a push rod mechanism according to an embodiment of the present invention.

Fig. 2 is a front view of a push rod mechanism in an embodiment of the present invention.

Fig. 3 is a left side view of the push rod mechanism in an embodiment of the present invention.

Fig. 4 is a right side view of the push rod mechanism in an embodiment of the present invention.

FIG. 5 is a top view of a pusher mechanism in an embodiment of the present invention.

Fig. 6 is a cross-sectional view taken along plane a-a of fig. 5.

Fig. 7 is a schematic view of a prior art disc brake.

FIG. 8 is a schematic view of the housing in one embodiment of the utility model.

Reference numerals:

10. a main push rod; 11. an abutment section; 12. a stroke section; 13. a bearing connection section; 101. an annular groove; 102. a hollow part; 111. chamfering; 131. a bearing chamber; 132. a side wall; 133. a through hole; 134. a boss portion; 135. a second pin hole; 20. a bearing; 30. a pin shaft; 31. a first shaft section; 32. a shaft shoulder; 33. a second shaft section; 311. a first pin hole; 40. a side limiting roller; 50. a circlip; 60. a sleeve;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.

It is also noted herein that the term "coupled," if not specifically stated, may refer herein to not only a direct connection, but also an indirect connection in which an intermediate is present.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar parts, or the same or similar steps.

Fig. 7 is a schematic structural diagram of a disc brake according to the prior art, which may include a driving device, a transmission device, a brake disc 600, friction plates, a housing, and the like.

Wherein the housing may include the housing 200, the cover plate 240, and the outer cover 700 arranged in the axial direction of the brake disc 600 and relatively fixedly coupled by the coupling member. Wherein the housing 200 is used to mount the transmission, the cover 240 is used to cover the housing 200 and attach the brake to the axle flange, and the outer cover 700 is used to cover the brake disc 600. The housing 200 and the outer cover 700 serve primarily as housings for the brake of the present invention, and the cover 240 is interposed between the housing 200 and the outer cover 700 for enclosing a portion of the actuator within the housing 200 and mounting the brake to the axle flange.

The disc brake can be driven by using the air chamber push rod 100 of the existing drum brake and an automatic adjusting mechanism or an electric device as a driving device. The transmission may use the principles of gear transmission and screw transmission to convert circular motion into linear motion of the friction plates, thereby generating a braking torque. The friction plates are disposed on both sides of the disc, and may include a dynamic friction plate 810 and a static friction plate 820. The transmission means may include a gear shaft 400, a ramp gear 300, a push rod 100, and the like. The ramp gear 300 is a ring gear with partial internal teeth, and the gear shaft 400 is internally engaged with the ring gear. The outer peripheral surface of the ramp gear 300 is provided with a plurality of spiral ramps, the push rod 100 is arranged at the ramp 302, under the limiting action of the limiting hole of the cover plate 240, the push rod 100 moves along a straight line and pushes the thrust frame 500 to be close to the brake disc 600, the dynamic friction plate 810 is pushed to be pressed against one end of the brake disc 600, the brake disc 600 slides in the axial direction of the outer hub in a small displacement mode and is pressed with the friction plates on the two sides of the brake disc 600, and therefore braking torque is generated. The disc brake applies a ramp boosting principle, a spiral slope surface is arranged on the circumferential surface of a ramp gear 300, the rotary motion of the slope surface is converted into linear motion, and multiple boosting can be realized through the transmission device.

In the disc brake, the push rod is pushed by the ramp gear, and due to the spiral structure of the ramp, the push rod can bear certain torque, so that the friction force between the push rod and the cover plate is increased, and the conditions of unstable transmission process, partial power loss and the like are caused.

The utility model provides a push rod mechanism of a disc brake, which aims to increase the strength of a push rod and reduce the occupied space of the push rod, so that the structure is compact, and the whole volume of a brake disc is reduced.

As shown in fig. 1 to 6, the push rod mechanism for converting a rotational motion of the ramp gear into a linear motion to push the brake disc includes a main push rod 10, a bearing 20, and a side stopper roller 40.

In some embodiments, the main push rod 10 includes an abutment section 11 at its upper portion, a stroke section 12 at its middle portion, and a bearing connection section 13 at its bottom portion; the abutting section 11, the stroke section 12 and the bearing connecting section 13 are of straight rod structures, and the cross-sectional shapes and the sizes of the straight rod structures are the same; the bearing connecting section 13 of the main push rod 10 has an inwardly recessed bearing chamber 131, and a pair of side walls 132 of the bearing connecting section 13 are provided with through holes 133 at positions near the bottom. In this embodiment, the abutment section 11 is used for abutting the thrust frame, and the bearing connection section 13 is used for mounting the bearing 20. The abutting section 11, the stroke section 12 and the bearing connecting section 13 are of a straight rod structure, which means that the shapes and the sizes of the cross sections of the main parts of the abutting section, the stroke section 12 and the bearing connecting section 13 are equal. Compared with the main push rod 10, the bottom of the main push rod is provided with a thickened base structure (such as the push rod structure shown in fig. 1), which is equivalent to that each part of the main push rod 10 is thickened, so that the thickness of the periphery is kept consistent, and the strength of the main push rod is enhanced. And the step structure for limiting the working stroke of the main push rod 10 is cancelled, the length of the working stroke is unlimited and increased as much as possible, theoretically, the position close to the side limiting roller 40 can be reached, and the length of the whole main push rod 10 is favorably reduced, so that the structure of the transmission device of the disc brake is compact as much as possible, and the whole volume of the transmission device of the disc brake is favorably reduced.

In some embodiments, the bearing 20 is installed in the bearing chamber 131 by the pin shaft 30 penetrating the through hole 133, and the highest point of the outer circumferential surface of the bearing 20 protrudes out of the bearing chamber 131; one end of the pin 30 is flush with one side surface of the main push rod 10, the other end of the pin extends out of the other side surface of the main push rod 10, and the side limiting roller 40 is installed on a shaft section of the pin 30 extending out of the other side surface of the main push rod 10.

In some embodiments, the cross-section of the main putter 10 is a rectangle with circular arcs on one side, or a shape of a part of a circle is symmetrically cut out by two rectangles.

In some embodiments, the side limiting roller 40 is mounted on the pin shaft 30 through a bushing, the inner side of the side limiting roller 40 is positioned by the shoulder 32 of the pin shaft 30, and the outer side of the side limiting roller is positioned by the elastic collar 50 mounted on the pin shaft 30.

In some embodiments, the abutting portion 11 of the main push rod 10 and the stroke portion 12 are provided with an annular groove 101. The annular recess 101 may be provided with a sealing arrangement to ensure a seal within the tank.

In some embodiments, the abutment section 11 and the stroke section 12 of the main push rod 10 have axially arranged hollows 102. Under the condition of the same material sectional area, the hollow structure has better strength and rigidity, the wall thickness of the hollow structure cannot be too thin, and the phenomenon that the hollow structure is partially folded to lose the bearing capacity is prevented.

In some embodiments, the outer edge of the top surface of the abutment section 11 of the main push rod 10 has a chamfer 111 or a fillet.

In some embodiments, the bearing connecting section 13 of the main push rod 10 has a protrusion 134 thickened downward at the position where the through hole 133 is opened, so as to avoid bending, breaking and the like at the supporting position around the through hole 133.

The pin shaft 30 is provided with a first pin hole 311 along the radial direction thereof, the wall part of one side of the bearing connecting section 13 is provided with a corresponding second pin hole 135, and the pin shaft 30 is fixedly connected with the bearing connecting section 13 through pins or elastic rolling sheets arranged in the two pin holes.

The bottom of the main push rod 10 of the embodiment of the utility model is supported by the bearing 20, so that the friction resistance can be further reduced, the power consumption is reduced, the brake can exert the maximum efficiency, and the green low-carbon economic requirement is met. Preferably, the bearing 20 is a needle bearing 20, which has small friction resistance, low power consumption, compact structure, light weight and smaller axial dimension.

According to another aspect of the utility model, a disc brake housing 200 is also provided. As shown in FIG. 8, the entrance end of the groove 221 is flush with the end face of the open end of the housing 200 so that the side-limiting roller 40 of the main putter 10 mechanism fits into it. The cross-section of the groove 221 is substantially rectangular. In some embodiments, the number of the grooves 221 is the same as the number of the ramps 302 and the number of the push rods of the ramp gear 300, and three grooves may be provided, but the utility model is not limited thereto.

The box shell 200 of the disc brake is provided with the groove 221 capable of being provided with the side limiting roller 40, can effectively bear the torque or bending moment of a push rod mechanism of the disc brake, and transmits the force to the axle, so that the stress of the whole disc brake is more scientific and reasonable, and the transmission process is more stable.

(2) The push rod mechanism of the embodiment of the utility model is provided with the side limiting roller on the outer side of the main push rod, the inner side surface of the box shell is provided with the groove, and the side limiting roller is clamped in the groove, so that the torque or bending moment borne by the push rod of the push rod mechanism can be completely transmitted to the box shell and then transmitted to the axle by the box shell. The stress of the whole disc brake is more scientific and reasonable, and the transmission process of the transmission device is more stable.

(3) The push rod mechanism provided by the embodiment of the utility model adopts the bearing support at the bottom of the main push rod, so that the friction resistance can be further reduced, the power consumption is reduced, the brake can exert the maximum efficiency, and the green low-carbon economic requirement is met. The base part of the push rod adopts an arc-shaped supporting structure, so that the bearing capacity of the whole push rod can be improved.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments in the present invention.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The push rod mechanism of the disc brake is used for converting the rotary motion of a ramp gear into linear motion so as to push a brake disc, and is characterized by comprising a main push rod, a bearing and a side limiting roller;

the main push rod comprises an abutting section positioned at the upper part of the main push rod, a stroke section positioned at the middle part of the main push rod and a bearing connecting section positioned at the bottom of the main push rod; the abutting section, the stroke section and the bearing connecting section are of straight rod structures, and the cross section shapes and the cross section sizes of the abutting section, the stroke section and the bearing connecting section are the same;

the bearing connecting section of the main push rod is provided with an inwards concave bearing chamber, and a pair of side walls of the bearing connecting section are provided with through holes at positions close to the bottom;

the bearing is arranged in the bearing chamber through a pin shaft which is arranged on the through hole in a penetrating way, and the highest point of the peripheral surface of the bearing protrudes out of the bearing chamber;

one end of the pin shaft is flush with one side face of the main push rod, the other end of the pin shaft extends out of the other side face of the main push rod, and the side limiting idler wheel is installed on a shaft section of the pin shaft, extending out of the other side face of the main push rod.

2. The disc brake tappet mechanism of claim 1, wherein the cross-section of the primary tappet is rectangular with a pair of sides being circular arcs.

3. The disc brake tappet mechanism of claim 1, wherein the side limiting roller is mounted on the pin shaft through a bushing, the inner side of the side limiting roller is positioned through a shoulder of the pin shaft, and the outer side of the side limiting roller is positioned through a circlip mounted on the pin shaft.

4. The disc brake tappet mechanism of claim 1, wherein the abutment section of the main tappet and the abutment section of the stroke section are provided with an annular groove.

5. The disc brake tappet mechanism of claim 1, wherein the abutment section and the stroke section of the main tappet have axially arranged hollow portions.

6. The disc brake tappet mechanism of claim 1, wherein an outer edge portion of the top surface of the abutment section of the main tappet has a chamfer or a fillet.

7. The tappet mechanism of a disc brake of claim 1, wherein the bearing connecting section of the main tappet has a downwardly thickened boss at a portion where the through hole is opened.

8. The disc brake tappet mechanism of claim 1, wherein the pin has a first pin hole along a radial direction thereof, and the wall portion of one side of the bearing connecting section has a corresponding second pin hole, and the pin is fixedly connected to the bearing connecting section by a pin or an elastic coil sheet installed in the two pin holes.

9. The tappet mechanism of a disc brake of claim 1, wherein the bearing is a needle bearing.