Overrunning clutch of motorcycle

Abstract

The utility model relates to the technical field of overrunning clutches, in particular to a motorcycle overrunning clutch. The power assembly comprises a disc body and a cover body, a plurality of installation grooves are formed in the inner ring side of the disc body in the circumferential direction, and starting beads are installed in the installation grooves. The inner ring side of the disc body is provided with a plurality of supporting strips corresponding to the mounting grooves in a one-to-one mode, the supporting strips are fixedly connected with spring pieces, the free ends of the spring pieces extend into the corresponding mounting grooves and are matched with the starting beads, and the cross sectional area of the spring pieces gradually shrinks from the ends connected with the supporting strips to the free ends. As the size of the spring piece is gradually reduced from one end of the connecting support strip to the free end, the part with smaller size is easier to elastically deform. When the starting bead presses the free end of the spring piece, overall bending deformation of the spring piece can be more evenly distributed to all parts of the spring piece, the degree of bending deformation generated at the joint of the spring piece and the supporting strip is reduced, and therefore the risk of local early fracture of the spring piece is reduced, and the effect of prolonging the service life of the spring piece is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of overrunning clutches, in particular to an overrunning clutch for a motorcycle. Background Art

[0002] The overrunning clutch is a one-way power transmission structure with reverse overrunning formed between the inner core and the overrunning clutch by arranging a rolling body in a wedge-shaped receiving groove and utilizing an elastic component.

[0003] In the prior art, a Chinese patent (Announcement No.: CN201779176U) discloses a motorcycle overrunning clutch body, which includes a disc body and a starter bead, which is installed in a mounting groove opened in the inner circle of the disc body, and a spring sheet matched with the starter bead is arranged in each mounting groove, and a disc body cover is arranged on the disc body, and the disc body cover covers one end face and the outer circumference of the disc body, and a circular hole is opened in the center of the disc body cover corresponding to the central hole of the disc body, and the edge of the circular hole is provided with a support bar distributed along the axial direction of the disc body, and a support bar is arranged between the two mounting grooves in the inner circle of the disc body, and one end of the spring sheet extending out of the mounting groove is welded on the support bar. The starter bead of the overrunning clutch is pushed to reset by the spring sheet during operation, saving the space occupied by the spring.

[0004] The above-mentioned overrunning clutch has some problems during use. First, the existing spring sheet is usually a rectangular sheet, and the connection between the spring sheet and the support bar will bend and deform repeatedly during operation. During the bending process, the deformation of the spring sheet is not uniform, and the deformation is mainly concentrated at the connection between the spring sheet and the support bar. The connection between the spring sheet and the support bar will produce a large angle of bending, which makes the connection between the spring sheet and the support bar easy to break, thereby causing the overrunning clutch to be unusable. Secondly, the connection between the spring sheet and the support bar is welded, and the welded connection between the spring sheet and the support bar forms hard and brittle martensite, which makes the spring sheet easy to fall off from the support bar when external force acts. Utility Model Content

[0005] In view of the above defects, the technical problem to be solved by the utility model is to provide a motorcycle overrunning clutch, which can improve the uniformity of deformation of the spring leaf during operation and reduce the risk of breakage at the connection between the spring leaf and the support bar.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A motorcycle overrunning clutch comprises a disc body and a cover body, wherein the inner ring side of the disc body is provided with a plurality of mounting grooves along the circumferential direction, a starting bead is installed in the mounting groove, the cover body is fixed to one end of the disc body, the disc body is annular, the inner ring side of the disc body is provided with a plurality of support bars corresponding to the mounting grooves one by one, the support bars are located between two adjacent mounting grooves, a spring sheet is fixedly connected to the support bars, the free end of the spring sheet extends into the corresponding mounting groove and cooperates with the starting bead, and the cross-sectional area of ​​the spring sheet gradually shrinks from one end connected to the support bar to the free end.

[0008] By adopting the above solution, since the size of the spring sheet gradually shrinks from one end connected to the branch bar to the free end, the smaller part is more likely to be elastically deformed. When the starting bead presses the free end of the spring sheet, the overall bending deformation of the spring sheet can be more evenly distributed to various parts of the spring sheet, reducing the degree of bending deformation generated at the connection between the spring sheet and the branch bar, thereby reducing the risk of early fracture due to local fatigue intolerance of the spring sheet, thereby achieving the effect of extending the service life of the spring sheet.

[0009] The utility model is further configured such that the width of the spring sheet gradually shrinks from one end of the connecting support bar to the free end. By gradually reducing the size of the spring sheet in the width direction, it is possible to ensure that the bending deformation of the spring sheet during operation can be more evenly distributed along its length direction while ensuring the spring sheet's rebound performance, thereby reducing the local bending degree of the spring sheet and extending the life of the spring sheet. In addition, since only the size of the spring sheet in the width direction is changed, the spring sheet only needs to be cut and processed using existing spring sheet materials, saving costs.

[0010] The utility model is further configured such that the spring sheet includes a first fixed portion, a deformable portion and a butting portion connected in sequence, the first fixed portion is fixedly connected to the corresponding support bar, the two sides of the deformable portion along its width direction are both arc-shaped, and the butting portion abuts against the corresponding starting bead. Since the deformable portion is arc-shaped, the spring sheet gradually shrinks more evenly along its length direction, which can ensure the elastic working performance of the spring sheet.

[0011] The utility model is further configured that the two side edges of the deformation portion along the width direction are inwardly concave arcs. Since the two side edges are inwardly concave arcs, less material is required for the spring sheet, saving costs.

[0012] The utility model is further configured such that at least part of the width of the abutting portion is greater than the minimum width of the deformation portion. Since the part of the width of the abutting portion is away from the width of one end of the first fixing portion, the contact area between the abutting portion and the actuating bead is ensured, and the stability of the force transmission between the spring sheet and the actuating bead is ensured.

[0013] The utility model is further configured such that the spring sheet also includes a second fixing portion, the first fixing portion and the second fixing portion are both sheet-shaped, the second fixing portion is overlapped on the side of the first fixing portion away from the support bar, and the second fixing portion, the first fixing portion and the corresponding support bar are welded together. Since the first fixing portion and the second fixing portion are overlapped together, when the spring sheet is welded to the support bar, resistance welding is performed from the outer surface of the second fixing portion to form two welding points on the surface of the second fixing portion, and the second fixing portion, the first fixing portion and the support bar are welded together. Through actual starting tests and spring sheet bending tests, the first fixing portion and the second fixing portion overlapped and welded on the support bar have better stability than a single spring sheet welded on the support bar, and the first fixing portion and the second fixing portion overlapped and welded on the support bar, and the spring sheet is not easy to fall off from the welding point.

[0014] The utility model is further configured such that the second fixing part is connected to the first fixing part through a connecting part, and the connecting part can be bent and deformed under the action of an external force so that the second fixing part and the first fixing part are overlapped together. Since the first fixing part is connected to the second fixing part through the connecting part, the second connecting part is turned over before being overlapped on the first connecting part for welding, and the connecting part is bent under the action of the second fixing part, so that the second fixing part and the first fixing part are overlapped together. During welding, there is no need to position the second connecting part separately, which facilitates the welding operation.

[0015] The utility model is further configured such that the first fixing part, the abutting part, the connecting part and the second fixing part are integrally formed. Since the first fixing part, the second fixing part, the abutting part and the connecting part are integrally formed, the three can be stamped and cut from a spring sheet, which makes processing easier and saves processing costs.

[0016] The utility model is further configured such that the width of the connecting portion is smaller than the width of the first fixing portion and the second fixing portion. Since the width of the connecting portion is smaller than the width of the first fixing portion and the second fixing portion, the connecting portion is more easily deformed and easier to fold.

[0017] The utility model is further configured such that the cover body is provided with a plurality of through holes corresponding to the mounting grooves one by one, and when the mounting grooves are projected onto the cover body, the projection line of the mounting grooves and the through holes enclose the range of the slag discharge channel. Since there is a slag discharge channel between the mounting grooves and the through holes, some waste residues such as oil sludge inside the overrunning clutch can be discharged through the slag discharge channel, thereby ensuring the stability of the overrunning clutch operation.

[0018] In summary, the motorcycle overrunning clutch provided by the utility model has at least the following beneficial effects:

[0019] 1. The overall bending deformation of the spring sheet can be more evenly distributed to various parts of the spring sheet, reducing the degree of bending deformation at the connection between the spring sheet and the support bar, thereby reducing the risk of early fracture due to local fatigue intolerance of the spring sheet and extending the service life of the spring sheet.

[0020] 2. The stability of the welding connection between the first fixing part and the support bar is improved, and the spring sheet is not easy to fall off from the support bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any novel labor.

[0022] Figure 1 It is the front view of the utility model;

[0023] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0024] Figure 3 It is a structural schematic diagram of the end cover and the disc body in the utility model assembled together and in the front view perspective (the support bar is in the unfolded state);

[0025] Figure 4 This is a schematic diagram of the structure of the first spring sheet in the utility model when it is unfolded;

[0026] Figure 5 It is a structural schematic diagram of the first fixing part and the second fixing part in the first spring sheet of the utility model being overlapped together;

[0027] Figure 6 This is a schematic diagram of the structure of the second spring sheet in the utility model when it is unfolded;

[0028] Figure 7 It is a structural schematic diagram of the first fixing part and the second fixing part in the second spring sheet of the utility model being overlapped together.

[0029] The reference numerals include: disc body 1, cover body 2, mounting groove 3, starting bead 4, support bar 5, spring sheet 6, first fixing portion 601, deformation portion 602, supporting portion 603, second fixing portion 604, connecting portion 605, through hole 7, slag discharge channel 8, edging 9, first assembly hole 10, and second assembly hole 11. DETAILED DESCRIPTION

[0030] In order to make those skilled in the art better understand the technical solution of the utility model, the following Figure 1-7 The utility model is further described in detail with specific implementation methods.

[0031] See also Figure 1-7 The present embodiment provides a motorcycle overrunning clutch, comprising an annular disc body 1 and an annular cover body 2. The inner ring side of the disc body 1 is provided with a plurality of mounting grooves 3 along the circumferential direction, and a starter bead 4 is installed in the mounting groove 3. In the present embodiment, nine mounting grooves 3 are preferably provided, and the nine mounting grooves 3 are evenly distributed along the circumferential direction of the disc body 1. The cover body 2 is fixed to one end of the disc body 1. Specifically, the outer ring side of the cover body 2 has an annular edging 9, and the outer ring side of the disc body 1 is wrapped inside by the edging 9. In order to enhance the stability of the connection between the cover body 2 and the disc body 1, the edging 9 and the disc body 1 are connected by welding. The inner ring side of the disc body 1 is provided with a plurality of support bars 5 corresponding to the mounting grooves 3 one by one, and the support bar 5 is located between two adjacent mounting grooves 3. The support bar 5 is fixedly connected with a spring sheet 6, and the free end of the spring sheet 6 extends into the corresponding mounting groove 3 and cooperates with the starter bead 4. The cross-sectional area of ​​the spring sheet 6 gradually shrinks from one end connected to the support bar 5 to the free end. The cross-sectional area of ​​the spring sheet 6 may be such that the width remains unchanged and the thickness gradually shrinks, or the width gradually shrinks. In order to save costs, the spring sheet material produced by the existing manufacturer is directly purchased to cut the spring sheet 6. In this embodiment, the width of the spring sheet 6 preferably gradually shrinks from one end of the connecting support bar 5 to the free end, and the thickness remains unchanged. The thickness of the spring sheet 6 may be specifically 0.06 mm.

[0032] By adopting the above solution, when in use, since the size of the spring sheet 6 gradually shrinks from one end connected to the support bar 5 to the free end, the smaller part is more likely to be elastically deformed. When the starter bead 4 presses the free end of the spring sheet 6, the overall bending deformation of the spring sheet 6 can be more evenly distributed to various parts of the spring sheet 6, reducing the degree of bending deformation generated at the connection between the spring sheet 6 and the support bar 5, thereby reducing the risk of early fracture due to fatigue resistance of the local part of the spring sheet 6, thereby achieving the effect of extending the service life of the spring sheet 6.

[0033] In some embodiments, the spring sheet 6 includes a first fixed portion 601, a deformable portion 602, and a butting portion 603 connected in sequence, the first fixed portion 601 is fixedly connected to the corresponding branch bar 5, the two sides of the deformable portion 602 along its width direction are both arc-shaped, and the butting portion 603 abuts against the corresponding starting bead 4. Among them, the two sides of the deformable portion 602 along its width direction can be arc-shaped protruding outwards or arc-shaped concave inwards, as long as the cross-sectional area of ​​the spring sheet 6 gradually shrinks from one end connected to the branch bar 5 to the free end. In this embodiment, it is preferred that the two sides of the deformable portion 602 along its width direction are arc-shaped concave inwards.

[0034] In order to ensure the contact area between the free end of the spring sheet 6 and the actuating bead 4, further, the width of at least part of the abutting portion 603 is greater than the width of the end of the deforming portion 602 away from the first fixing portion 601. The side of the abutting portion 603 and the corresponding side of the deforming portion 602 are connected in an arc-shaped smooth transition.

[0035] In order to improve the stability of welding between the spring sheet 6 and the support bar 5, the spring sheet 6 further includes a second fixing portion 604, the first fixing portion 601 and the second fixing portion 604 are both sheet-shaped, the second fixing portion 604 is superimposed on the side of the first fixing portion 601 away from the support bar 5, and the second fixing portion 604, the first fixing portion 601 and the corresponding support bar 5 are welded together. The second fixing portion 604 is connected to the first fixing portion 601 through a connecting portion 605, and the connecting portion 605 can be bent and deformed under the action of an external force so that the second fixing portion 604 and the first fixing portion 601 are superimposed together. The first fixing portion 601, the connecting portion 605, the abutting portion 603 and the second fixing portion 604 are integrally formed. When processing the spring sheet 6, a piece of material of the spring sheet 6 is cut by stamping and cutting to form the second fixing portion 604, the connecting portion 605, the first fixing portion 601, the deformation portion 602 and the abutting portion 603. The width of the second fixing portion 604 is smaller than that of the first fixing portion 601, and the width of the connecting portion 605 is smaller than that of the first fixing portion 601 and the second fixing portion 604. The first fixing portion 601 is in a rectangular sheet shape, and the second fixing portion 604 is in a sheet shape.

[0036] Please continue reading Figure 4 and Figure 5 In some embodiments, the shape of the second fixing portion 604 can be the same rectangle as the first fixing portion 601, but after the second fixing portion 604 is superimposed on the first fixing portion 601, the second fixing portion 604 needs to be aligned with the center of the first fixing portion 601. If the centers of the two are offset, the edge of the second fixing portion 604 will protrude from the outer edge of the first fixing portion 601, which increases the difficulty of operation for the operator.

[0037] Please continue reading Figure 6 and Figure 7In some embodiments, the second fixing portion 604 is generally shaped like an isosceles trapezoid, and one side connected to the connecting portion 605 is the lower base of the isosceles trapezoid, and the lower base includes two oblique sides, and the two oblique sides are inclined toward the connecting portion 605, so that the middle of the side corresponding to the lower base protrudes toward the connecting portion 605. Since the two oblique sides connecting the second fixing portion 604 and the connecting portion 605 are inclined toward the connecting portion 605, when the second fixing portion 604 is superimposed on the first fixing portion 601, the center of the second fixing portion 604 is offset from the center of the first fixing portion 601 within a certain range, and the edge connection of the second fixing portion 604 will not protrude from the edge of the first fixing portion 601. This makes it unnecessary for the centers of the second fixing portion 604 to completely overlap when superimposed on the first fixing portion 601, thereby reducing the difficulty of operation.

[0038] Please continue reading Figure 1 and Figure 3 In order to facilitate the installation of the overrunning clutch, three first assembly holes 10 are opened on the disc body 1 along the circumferential direction, and the three first assembly holes 10 are evenly distributed. Three second assembly holes 11 corresponding to the first assembly holes 10 are opened on the cover body 2.

[0039] Please continue reading Figure 3 In order to discharge the waste residue inside the overrunning clutch, the cover body 2 is further provided with a plurality of through holes 7 corresponding to the mounting grooves 3. Part of the range of the through holes 7 is blocked by the disc body 1. When the mounting grooves 3 are projected onto the cover body 2, the projection line of the mounting grooves 3 and the through holes 7 enclose the range of the slag discharge channel 8. Please continue to read Figure 3 The support bar 5 is in an expanded state. During processing, the support bar 5 is formed by punching and cutting the cover body 2, and the free end of the support bar 5 faces the center of the cover body 2. The support bar 5 is bent 90 degrees toward the side of the mounting plate body 1, and then the second fixing portion 604 and the first fixing portion 601 are welded to the support bar 5 by resistance spot welding.

[0040] It should be noted that the words indicating direction in this article, such as up and down, are all based on Figure 1 The setting of the direction is only for the convenience of description and has no other specific meaning.

[0041] It should also 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 "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an 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 article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0042] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A motorcycle overrunning clutch, comprising a disc body (1) and a cover body (2), wherein the inner ring side of the disc body (1) is provided with a plurality of mounting grooves (3) along the circumferential direction, wherein a starting bead (4) is installed in the mounting groove (3), wherein the cover body (2) is fixed to one end of the disc body (1), wherein the disc body (1) is annular, wherein the inner ring side of the disc body (1) is provided with a plurality of support bars (5) corresponding to the mounting grooves (3) one by one, wherein the support bars (5) are located between two adjacent mounting grooves (3), wherein the support bars (5) are fixedly connected with a spring sheet (6), wherein the free end of the spring sheet (6) extends into the corresponding mounting groove (3) and cooperates with the starting bead (4), wherein the cover body (2) is fixed to one end of the disc body (1), wherein the inner ring side of the disc body (1) is provided with a plurality of support bars (5) corresponding to the mounting grooves (3) one by one, wherein the support bars (5) are located between two adjacent mounting grooves (3), wherein the spring sheet (6) is fixedly connected with the ... The cross-sectional area of ​​the spring sheet (6) gradually shrinks from one end connected to the support bar (5) to the free end.

2. A motorcycle overrunning clutch as claimed in claim 1, characterized in that: The width of the spring sheet (6) gradually shrinks from one end connected to the support bar (5) to the free end.

3. A motorcycle overrunning clutch as claimed in claim 2, characterized in that: The spring sheet (6) comprises a first fixed portion (601), a deformable portion (602) and a supporting portion (603) which are connected in sequence, wherein the first fixed portion (601) is fixedly connected to the corresponding support bar (5), the two side edges of the deformable portion (602) along its width direction are both arc-shaped, and the supporting portion (603) is in contact with the corresponding starting bead (4).

4. A motorcycle overrunning clutch as claimed in claim 3, characterized in that: The two side edges of the deformation portion (602) along its width direction are inwardly concave arcs.

5. A motorcycle overrunning clutch as claimed in claim 3 or 4, characterized in that: The width of at least part of the abutting portion (603) is greater than the width of an end of the deforming portion (602) away from the first fixing portion (601).

6. A motorcycle overrunning clutch as claimed in claim 3 or 4, characterized in that: The spring sheet (6) further comprises a second fixing portion (604); the first fixing portion (601) and the second fixing portion (604) are both in sheet shape; the second fixing portion (604) is overlapped on a side of the first fixing portion (601) away from the support bar (5); and the second fixing portion (604), the first fixing portion (601) and the corresponding support bar (5) are welded together.

7. A motorcycle overrunning clutch as claimed in claim 6, characterized in that: The second fixing portion (604) is connected to the first fixing portion (601) via a connecting portion (605), and the connecting portion (605) can be bent and deformed under the action of an external force so that the second fixing portion (604) and the first fixing portion (601) are overlapped together.

8. A motorcycle overrunning clutch as claimed in claim 7, characterized in that: The first fixing portion (601), the abutting portion (603), the connecting portion (605) and the second fixing portion (604) are integrally formed.

9. A motorcycle overrunning clutch as claimed in claim 7 or 8, characterized in that: The width of the connecting portion (605) is smaller than the widths of the first fixing portion (601) and the second fixing portion (604).

10. A motorcycle overrunning clutch as claimed in claim 1, characterized in that: The cover body (2) is provided with a plurality of through holes (7) corresponding one to one with the mounting grooves (3); when the mounting grooves (3) are projected onto the cover body (2), the projection line of the mounting grooves (3) and the through holes (7) enclose the range of the slag discharge channel (8).

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