Mandrel, braking mandrel assembly and braking assembly

Abstract

The utility model relates to the field of vehicle accessories, in particular to a mandrel which is provided with a first guide surface, a second guide surface and a connecting cambered surface, an included angle between the first guide surface and the second guide surface is larger than or equal to 16 degrees and smaller than or equal to 90 degrees, and the connecting cambered surface is connected to the first guide surface and the second guide surface. The distance between the intersection point of projection lines of the first guide face and the second guide face on the cross section of the core shaft and the center of the core shaft is larger than or equal to 0.9 R, and R is the radius of the connecting arc face. The utility model further provides a braking core shaft assembly and a braking assembly based on improvement of the core shaft. The problems of insufficient braking force, gnawing, locking, noise and dragging in the braking process can be solved. According to the utility model, the structure of the mandrel is optimally designed, so that the problems in the prior art are effectively solved.

Description

Technical Field

[0001] The utility model relates to the field of vehicle accessories, in particular to a spindle and a brake spindle assembly, and a brake assembly. Background Art

[0002] Drum brakes are common brakes that use brake transmission components to drive the brake shoe against the brake drum to achieve braking deceleration. When the horseshoe rotates, it rotates around the core shaft fixed to the brake mounting seat. During the rotation process, the horseshoe gradually gets close to the inside of the brake drum to brake. The horseshoe releases the brake drum by rotating. Due to the rotation of the horseshoe fixed axis, it is difficult to make the horseshoe and the brake drum contact evenly, which leads to problems such as insufficient braking force, gnawing, locking, noise, and drag.

[0003] In order to ensure uniform contact between the horse shoe and the brake drum, one of the optimized designs is shown in the plane overlapper shown in application number 202211256244.7. By setting a sliding surface on the core shaft, the bushing slides while rotating, so that the brake shoe can rotate and slide synchronously and press against the brake drum.

[0004] At present, a large obtuse angle is mostly used for the sliding surface of the mandrel (the above patent uses 155° to 158°). In order to ensure that the sliding surface has sufficient length during processing, the sliding surface is often moved close to the center of the mandrel. This results in a large amount of cutting during the cutting process of the mandrel, a smaller actual cross-sectional area of ​​the mandrel, and a reduced strength of the mandrel. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a spindle and a brake spindle assembly, and a brake assembly, which effectively solves the problems existing in the prior art by optimizing the structure of the spindle.

[0006] In order to solve the above problems, the utility model provides a core shaft, which has a first guide surface, a second guide surface, and a connecting arc surface. The angle between the first guide surface and the second guide surface is greater than or equal to 16° and less than or equal to 90°. The connecting arc surface is connected to the first guide surface and the second guide surface. The distance between the intersection of the projection lines of the first guide surface and the second guide surface on the cross section of the core shaft and the center of the core shaft is greater than or equal to 0.9R, where R is the radius of the connecting arc surface.

[0007] Furthermore, an intersection point of projection lines of the first guide surface and the second guide surface on the cross section of the core shaft is located outside the core shaft.

[0008] Furthermore, the chord lengths of the first guide surface and the second guide surface projected on the cross section of the core shaft are both greater than or equal to 0.6R.

[0009] Furthermore, a circular chamfer is provided between the first guide surface and the second guide surface.

[0010] Furthermore, the distance between the edges of the first guide surface and the second guide surface facing the central vertical surface of the core shaft and the central vertical surface of the core shaft is less than or equal to 0.3R.

[0011] The utility model provides a brake spindle assembly, including the above-mentioned spindle, and the spindle assembly also includes a bushing that can be sleeved on the outside of the spindle, the bushing has a first sliding surface that cooperates with the first guide surface, and a second sliding surface that cooperates with the second guide surface, so that the bushing can slide along the first guide surface or the second guide surface when it is set on the spindle.

[0012] The utility model provides a brake assembly, including the above-mentioned spindle assembly, the brake assembly also includes a brake drum, a brake shoe, an actuating member and a mounting seat, the actuating member is rotatably connected to one end of the brake shoe to drive the brake shoe to move toward the brake assembly, and the end of the brake shoe away from the actuating member is rotatably connected to the outside of the bushing.

[0013] The beneficial effect of the utility model is that the problems existing in the prior art are effectively solved by optimizing the structure of the core shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the utility model and constitute a part of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an improper limitation on the utility model. In the drawings:

[0015] Figure 1 It is a structural schematic diagram of a brake assembly according to an embodiment of the utility model.

[0016] Figure 2 It is a structural schematic diagram of a core shaft according to an embodiment of the utility model.

[0017] Figure 3 for Figure 2 The illustrated embodiment is a schematic diagram of the structure after the bushing is installed.

[0018] Figure 4 It is a structural schematic diagram of a core shaft according to an embodiment of the utility model.

[0019] Figure 5 for Figure 4 The illustrated embodiment is a schematic diagram of the structure after the bushing is installed.

[0020] Among them: 1. core shaft 1; 2. first guide surface 2; 3. second guide surface 3; 4. bushing 4; 5. first sliding surface 5; 6. second sliding surface 6; 7. brake drum 7; 8. brake shoe 8; 9. actuator 9; 10. mounting seat 10. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the overall concept of the utility model, a detailed description is given below in the form of examples in conjunction with the accompanying drawings of the specification.

[0022] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the utility model. However, the utility model can also be implemented in other ways different from those described herein. Therefore, the protection scope of the utility model is not limited to the specific embodiments disclosed below.

[0023] In addition, in the description of the utility model, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0024] In the utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. However, if it is indicated as a direct connection, it means that the two connected entities are not connected through an intermediate structure, but are connected to form a whole through a connecting structure. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0025] In the utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0026] In the utility model, if Figure 1-5 As shown, a core shaft 1 is provided, which has a first guide surface 2, a second guide surface 3, and a connecting arc surface, the angle between the first guide surface 2 and the second guide surface 3 is greater than or equal to 16° and less than or equal to 90°, the connecting arc surface is connected to the first guide surface 2 and the second guide surface 3, and the distance between the intersection of the projection lines of the first guide surface 2 and the second guide surface 3 on the cross section of the core shaft 1 and the center of the core shaft 1 is greater than or equal to 0.9R, wherein R is the radius of the connecting arc surface.

[0027] The structure of the mandrel 1 of the utility model can control the starting position of the cutting of the mandrel 1 in the middle position by controlling the distance between the intersection of the projection line of the first guide surface 2 and the second guide surface 3 and the center of the mandrel 1 to reduce the cutting amount at this position. Compared with the processing scheme in the prior art where the intersection of the projection line is close to the center of the mandrel 1, the present application can make the mandrel 1 have a larger lateral dimension and a greater support strength under the action of the lateral component load. At the same time, by controlling the angle between the first guide surface 2 and the second guide surface 3, the projection line of the first guide surface 2 and the second guide surface 3 can be made longer than the existing scheme with a large obtuse angle, so as to ensure that the mandrel 1 has a longer guiding force-bearing surface at the two guide surface positions, maintain the guiding effect of the mandrel 1, and make the force at the two guide surface positions more balanced. Moreover, by controlling the lower limit of the angle between the first guide surface 2 and the second guide surface 3, the present application controls the position of the right edge of the first guide surface 2 and the second guide surface 3 not too close to the right, so as to keep the mandrel 1 at a sufficient height in the vertical direction, so as to further maintain the strength of the mandrel 1.

[0028] As for strengthening the structural strength of the mandrel, it is preferred that after the two guide surfaces are machined and formed, the guide surfaces of the mandrel are heat treated and strengthened to further improve the strength of the mandrel.

[0029] At the same time, as a further measure to strengthen the core shaft, in a preferred embodiment of the present utility model, the core shaft is made of alloy steel, thereby further improving the strength of the core shaft compared to the existing carbon steel core shaft.

[0030] It should be noted that, in the figure shown in FIG2 , the dotted line portion is the extension line of the first guide surface and the second guide surface. Figure 4 In the drawings shown in , the dotted line portion is the outline of the core shaft 1 which is a circular shaft.

[0031] In a preferred embodiment, the structure of the utility model is further optimized in that the intersection of the projection lines of the first guide surface 2 and the second guide surface 3 on the cross section of the mandrel 1 is located outside the mandrel 1. Figure 2 As shown, the first guide surface 2 and the second guide surface 3 are kept at a certain distance at the left edge position, which can reduce the stress concentration at this position, increase the vertical dimension of the core shaft 1 at the left side position, and further improve the strength of the core shaft 1 at this position.

[0032] In a preferred embodiment, a further optimized setting of the utility model is that the chord lengths of the first guide surface 2 and the second guide surface 3 projected on the cross section of the mandrel 1 are both greater than or equal to 0.6R. In this way, the lengths of the projections of the two guide surfaces on the cross section of the mandrel 1 can be controlled to ensure that the mandrel 1 has a longer guide force-bearing surface at the two guide surface positions, maintain the guide effect of the mandrel 1, and make the forces at the two guide surface positions more balanced.

[0033] In a preferred embodiment, a further optimized setting of the utility model is that a circular arc chamfer is provided between the first guide surface 2 and the second guide surface 3. Figure 2 and Figure 4 As shown, the stress concentration at the sharp corners of the first guide surface 2 and the second guide surface 3 at the left side can be reduced.

[0034] In a preferred embodiment, the utility model is further optimized in that the distance between the edge of the first guide surface 2 and the second guide surface 3 facing the central vertical surface of the mandrel 1 and the central vertical surface of the mandrel 1 is less than or equal to 0.3R. By setting it in this way, the cutting amount of the mandrel 1 in the horizontal direction can be controlled, and the cutting height of the mandrel 1 in the vertical direction can be controlled at the same time, especially after controlling the angle between the first guide surface 2 and the second guide surface 3 to be less than or equal to 90°, combined with the control of the right edge position of the two guide surfaces, the mandrel 1 can be kept with sufficient vertical dimensions and the strength of the mandrel 1 can be maintained.

[0035] The utility model also provides a brake spindle assembly, comprising the spindle 1 as described above, the spindle assembly also comprising a bushing 4 that can be sleeved on the outside of the spindle 1, the bushing 4 having a first sliding surface 5 that cooperates with the first guide surface 2, and a second sliding surface 6 that cooperates with the second guide surface 3, so that the bushing 4 can slide along the first guide surface 2 or the second guide surface 3 when being sleeved on the spindle 1.

[0036] The utility model also provides a brake assembly, including the spindle assembly as described above, the brake assembly also including a brake drum 7, a brake shoe 8, an actuator 9 and a mounting seat 10, the actuator 9 is rotatably connected to one end of the brake shoe 8 to drive the brake shoe 8 to move toward the brake drum 7 assembly, and the end of the brake shoe 8 away from the actuator 9 is rotatably connected to the outside of the bushing 4.

[0037] like Figure 1 As shown, when the stop assembly of the utility model is braking, the actuator pushes the brake shoe to rotate around the bushing, so that the brake shoe contacts the brake drum, and the brake drum drives the brake shoe and the bushing to slide synchronously along the guide surface, so that the brake shoe rotates and slides at the same time during the braking process. Compared with the implementation method in which the brake shoe only rotates in some embodiments, the brake shoe of the utility model can contact the brake drum more evenly during stopping, thereby improving the problems of insufficient braking force, gnawing, locking, noise, and dragging that occur during the braking process.

[0038] It should be noted that in the description of the present invention, the words "up, down, left, right, middle, vertical, horizontal, and transverse" used to refer to the orientation of the core shaft 1 are all referenced to Figure 1 The form shown is used as an example. When the placement form of the mandrel 1 changes, the features described above refer to Figure 1 The center, center line and center vertical plane of the mandrel 1 refer to the center point of the mandrel 1 with the connecting arc surface as the arc.

[0039] Each embodiment in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0040] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A mandrel, characterized in that: The core shaft has a first guide surface, a second guide surface, and a connecting arc surface. The angle between the first guide surface and the second guide surface is greater than or equal to 16° and less than or equal to 90°. The connecting arc surface is connected to the first guide surface and the second guide surface. The distance between the intersection of the projection lines of the first guide surface and the second guide surface on the cross section of the core shaft and the center of the core shaft is greater than or equal to 0.9R, where R is the radius of the connecting arc surface.

2. The mandrel according to claim 1, characterized in that The intersection point of the projection lines of the first guide surface and the second guide surface on the cross section of the mandrel is located outside the mandrel.

3. The mandrel according to claim 1, characterized in that The chord lengths of the first guide surface and the second guide surface projected on the cross section of the core shaft are both greater than or equal to 0.6R.

4. The mandrel according to claim 1, characterized in that A circular arc chamfer is arranged between the first guide surface and the second guide surface.

5. The mandrel according to claim 1, characterized in that The distance between the edges of the first guide surface and the second guide surface facing the central vertical surface of the core shaft and the central vertical surface of the core shaft is less than or equal to 0.3R.

6. A brake spindle assembly, characterized in that: The core shaft comprises the core shaft as described in any one of claims 1 to 5, and the core shaft assembly further comprises a bushing which can be sleeved on the outside of the core shaft, the bushing having a first sliding surface cooperating with the first guide surface and a second sliding surface cooperating with the second guide surface, so that the bushing can slide along the first guide surface or the second guide surface when being set on the core shaft.

7. A brake assembly, characterized in that: The invention comprises the spindle assembly as described in claim 6, wherein the brake assembly further comprises a brake drum, a brake shoe, an actuator and a mounting seat, wherein the actuator is rotatably connected to one end of the brake shoe to drive the brake shoe to move toward the brake assembly, and the end of the brake shoe away from the actuator is rotatably connected to the outside of the bushing.

Images