TW201343426A - Easily-assembling external pawl type ratchet hub - Google Patents

Abstract

An easily-assembling external pawl type ratchet hub is disclosed, which comprises a spindle unit, a housing, a driving member, a detent set, and an elastic member set. The housing comprises several accommodation grooves, and each accommodation groove is formed of a groove bottom surface and a pivotal part that match well. The driving member comprises a ratchet ring facing the said accommodation groove. Each detent of the detent set has: a pivotal rotation part in rotating match with the pivotal part, a claw part extending from the pivotal rotation part to mesh with the ratchet ring, and an insertion slot disposed at the claw part. Each elastic member of the elastic member set has an inserting sheet mounted on and tightly matched with the insertion slot, and an elastically propping-up piece extending from the inserting sheet and elastically propping up against the groove bottom surface. By assembling the elastic members and the detents in advance, assembly convenience can be enhanced, assembly labor hour can be saved, and the production efficiency can be increased.

Description

Easy-to-assemble outer claw-type ratchet flower hub

The invention relates to a flower hub, in particular to a ratchet hub which can be interchanged for left and right drive.

As shown in FIG. 1 and FIG. 2, the ratchet hub 10 as claimed in the applicant's patent No. I252815 has a spindle unit 11 and a housing 12 supported by the spindle unit 11 and rotatable. A clutch unit 13 disposed in the housing 12 and a sprocket seat 17 coupled to one end of the housing 12 by the clutch unit 13 are provided.

The housing 12 has a peripheral wall 122 defining an inner hole 121 around an axis, and a plurality of openings 123 and a plurality of receiving grooves 124 disposed at the end of the inner wall 121 and communicating with each other.

Each of the accommodating grooves 124 has a groove bottom surface 125 away from the opening 123, and a first limiting arc portion 126 and a second portion respectively engaging the groove bottom surface 125 and the opening 123 and having a circular shape and being symmetrical with each other. Limit arc portion 127.

The clutch unit 13 has a ratchet ring 14 extending into the inner bore 121, a plurality of pawls 15 and a plurality of elastic members 16. Each of the pawls 15 has a pivot end 151 pivotally mounted in the first limit arc portion 126 and a pawl portion for engaging the ratchet teeth 141 of the ratchet ring 14 152. Each of the elastic members 16 has a flexing portion 161 mounted in the second limiting arc portion 127 and a resilient abutting portion 162 for engaging the pawl 15.

Compared with the general inner-type rear flower hub, the patent has the advantages of light weight, easy assembly, and economical and practical improvement, but the pawls 15 and the elastic members 16 must be respectively placed in the accommodating. The assembly of the groove 124 is completed, resulting in a more time-consuming improvement of the assembly. In addition, the pawl 15 and the elastic member 16 are often subjected to quality inspection and part management operations.

As shown in FIG. 3 and FIG. 4, the pawl device 20 claimed in the No. M273524 has a wheel hub 21, a ratchet 22 and a plurality of pawl members 23, and each pawl member 23 has a bearing into the vehicle. The liner 24 of the receiving hole 211 of the hub 21 is attached to the copper piece 25 of the groove 212 of the wheel hub 21, a torsion spring 26 and a pawl body 27 located in the copper piece 25. A side of the pawl body 27 protrudes from a pivot 271 inserted into the liner 24 for the torsion spring 26, and a pin 271 inserted into the torsion spring 26 is inserted in parallel with the pivot 271. The latching groove 262 of the torsion spring 26 is biased against the copper piece 25. Although the patent can drive the wheel hub 21 by the pawl members 23, the overall design of the pawl members 23 is complicated, and the assembly is time-consuming. In addition, the pawl body 27 is provided with the card slot. 272 is again unable to be filled by the pin 261, resulting in a poor structural strength of the pawl body 27.

Accordingly, an object of the present invention is to provide an easy-to-assemble outer jaw type ratchet hub which can improve assembly convenience, save assembly time, and improve production efficiency.

Therefore, the outer jaw type ratchet hub of the present invention comprises a mandrel unit, a casing, a driving member, a pawl set and an elastic member set.

The mandrel unit extends along an axis.

The housing is supported by the spindle unit and rotatable about the axis, including a peripheral wall defining an inner bore surrounding the axis, and radially outwardly disposed from an inner annular surface of the peripheral wall and located at one end of the inner bore And a plurality of openings and a plurality of receiving slots, wherein each of the receiving slots is formed by a bottom surface of the slot away from the opening, and a pivoting portion that engages the bottom surface of the slot and the opening and has a circular shape.

The driving member is supported by the spindle unit and rotatable about the axis, and includes a ratchet ring extending into the inner hole and facing the receiving groove, the ratchet ring having a plurality of ratchets, each ratchet respectively Has a drive surface.

The pawl set includes a plurality of pawls, each of the pawls having a pivoting portion having a circular diameter and a pivotal engagement with the pivoting portion, and a pivoting portion extending from the pivoting portion for driving the surface of the ratchet ring Engaged claws, and a slot provided in the claws.

The elastic member set includes a plurality of elastic members respectively mounted between the accommodating grooves and the pawls for holding each pawl in engagement with the ratchet ring, and each elastic member has a mounting body respectively a tab that is slotted and tightly fitted to each other, and a resilient tab that extends from the tab to abut against the bottom surface of the slot.

The utility model has the advantages that the elastic members and the pawls can be assembled in advance, whereby the elastic members can be loaded into and taken out of the accommodating grooves synchronously with the pawls, thereby improving assembly convenience and saving. Assemble man-hours and increase production efficiency.

The foregoing and other objects, features, and advantages of the invention are set forth in the <RTIgt;

As shown in FIGS. 5-8, the preferred embodiment of the outer jaw type ratchet hub of the present invention comprises a spindle unit 30, a housing 40, a driving member 50, a pawl set 60 and an elastic Set of 70.

The spindle unit 30 includes a shaft 31 extending along an axis L, and a plurality of bearings 32 assembled to the shaft 31.

The housing 40 includes a peripheral wall 42 surrounding the axis L and defining an inner hole 41, and a plurality of openings that are radially outwardly disposed from an inner annular surface 421 of the peripheral wall 42 and are located at one end of the inner hole 41 and communicate with each other. 43 and the number of slots 44.

Each of the accommodating slots 44 is formed by a slot bottom surface 441 away from the opening 43 and a pivoting portion 442 that engages the slot bottom surface 441 and the opening 43 and has a circular shape. The pivoting portion 442 is formed at the pivoting portion 442. The symmetric position may be another pivoting portion 443 or the other pivoting portion 443 may not be provided.

The bearing member 32 of the driving member 50 is rotatable about the axis L, and includes a ratchet ring 51 extending into the inner hole 31 of the housing 30 and facing the receiving groove 44, and The ratchet ring 51 is integrally formed and located on the sprocket 52 outside the housing 40.

The ratchet ring 51 has a plurality of ratchet teeth 511 , and each of the ratchet teeth 511 has a driving surface 512 , and the driving surface 512 faces the pivoting portion 442 .

The pawl set 60 includes a plurality of pawls 61 adapted to be mounted on the pivoting portions 442 of the receiving slots 44. Each of the pawls 61 has a pivoting portion 611 having a circular diameter and a pivotal engagement with the pivoting portion 442. A claw portion 612 extending from the pivot portion 611 through the opening 43 for engaging with the driving surface 512 of the ratchet ring 51, and a slot 613 provided in the claw portion 612.

Further, each of the pawls 61 further has a first side 614 and a second side 615 in opposite directions, and the slot 613 communicates with the first side 614 and the second side 615, thereby designing The pawl 61 is integrally formed into a single strip shape, and the slots 613 are cut at a time. When the first side surface 614 and the second side surface 615 are cut, the shape of each pawl 61 can be made the same.

The elastic member set 70 includes a plurality of elastic members 71 mounted between the accommodating grooves 44 and the pawls 61 for holding the claw portions 612 of the pawls 61 with the ratchet ring 51. In the preferred embodiment, the elastic member 71 is a spring body which is bent by a steel sheet, and each elastic member 71 has a tab which is mounted on the slot 613 of each pawl 61 and is tightly fitted to each other. 711, a resilient tab 712 extending from the tab 711 to the bottom surface 441 of the slot, and a flexure 713 between the tab 711 and the resilient tab 712.

As shown in Figures 8, 9, and 10, the shape of the elastic member 71 can be varied.

Before assembling the flower hub, the tab 711 of each elastic member 71 is first inserted into the slot 613 of each pawl 61, that is, each elastic member 71 and each pawl 61 are pre-assembled.

When the flower hub is assembled, each elastic member 71 and each pawl 61 can be synchronously inserted into each corresponding receiving groove 44, and the pivoting portions 611 are respectively located in the pivoting portions 442. And causing the elastic abutting portions 712 of the elastic members 71 to respectively abut against the groove bottom surface 441 of the accommodating grooves 44 to drive the claw portions 612 of the pawls 61 and the ratchet teeth 511 of the ratchet ring 51. The face 512 remains engaged, such that when the sprocket 52 is subjected to a clockwise driving force (see arrow 80 of FIG. 8), the pawl 61 can be driven by the drive face 512 of the ratchet 511 of the ratchet ring 51. And generating the effect of driving the housing 40 to rotate clockwise. Conversely, when the sprocket 52 receives the driving force in the counterclockwise direction, the pawl 61 will be disengaged from the ratchet 511 to disengage, only Can produce idling.

In summary, the outer jaw type ratchet hub of the present invention has the following advantages and advantages, so that the object of the invention can be achieved:

1. The present invention can pre-assemble the elastic members 71 and the pawls 61 by inserting the tabs 711 of each elastic member 71 into the slots 613 of each pawl 61 and fitting them tightly to each other. Whether the elastic member 71 and the pawls 61 are to be inserted into the accommodating grooves 44, or the elastic members 71 and the claws 61 are taken out of the accommodating grooves 44, only one step is required. It can be completed, and the assembly convenience of the present invention can be improved, the assembly man-hour can be saved, and the production efficiency can be improved.

2. In practice, the elastic members 71 and the pawls 61 are manufactured and pre-assembled by the upstream parts factory. For the flower hub manufacturer, the pre-assembled assembly is directly obtained, except for the assembly simplification. And part management can save half of the work.

The matching design of the pawl 61 and the elastic member 71 of the present invention has the advantages of simple overall design and simple assembly compared with the pawl member 23 of the No. M273524 patent. In addition, the pawl of the present invention is provided. 61. The pivoting portion 611 is a rotating shaft, and the pawl body 27 of the No. M273524 patent has a pivot 271 as a rotating shaft. The design of the two is different, and the present invention is used by the slot 613 of each pawl 61. The design of the tabs 711 of the elastic members 71 to be filled and tightly fitted to each other does not destroy the structural strength of each of the pawls 61.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

30. . . Mandrel unit

31. . . Shaft

32. . . Bearing

40. . . case

41. . . Bore

42. . . Zhou wall

421. . . Inner annulus

43. . . Opening

44. . . Locating slot

441. . . Groove bottom

442. . . Pivot

443. . . Another pivotal part

50. . . Drive

51. . . Ratchet ring

511. . . Ratchet

512. . . Drive surface

52. . . Sprocket

60. . . Ratchet group

61. . . pawl

611. . . Pivot

612. . . Claw

613. . . Slot

614. . . First side

615. . . Second side

70. . . Elastic member group

71. . . Elastic part

711. . . Insert

712. . . Bounce piece

713. . . Flexure film

80. . . arrow

L. . . Axis

Figure 1 is an exploded perspective view of the No. I252815 patent;

Figure 2 is a combined sectional view of the No. I252815 patent;

Figure 3 is an exploded perspective view of the patent No. M273524;

Figure 4 is a sectional view of the combination of the patent No. M273524;

Figure 5 is an exploded perspective view of a preferred embodiment of the outer jaw type ratchet hub of the present invention;

Figure 6 is an exploded perspective view of an elastic member and a pawl of the preferred embodiment;

Figure 7 is an axial sectional view of the preferred embodiment;

Figure 8 is a cross-sectional view taken from line VIII-VIII in Figure 7, showing the driving state, while showing the first elastic member;

Figure 9 is a view similar to Figure 8 showing the second elastic member;

Figure 10 is a view similar to Figure 8 showing a third type of resilient member.

31. . . Shaft

40. . . case

41. . . Bore

43. . . Opening

44. . . Locating slot

441. . . Groove bottom

442. . . Pivot

443. . . Another pivotal part

51. . . Ratchet ring

511. . . Ratchet

512. . . Drive surface

61. . . pawl

611. . . Pivot

612. . . Claw

613. . . Slot

71. . . Elastic part

711. . . Insert

712. . . Bounce piece

713. . . Flexure film

80. . . arrow

Claims (3)

An outer jaw-type ratchet hub having an easy-to-assemble assembly comprising: a spindle unit extending along an axis; a housing supported by the spindle unit and rotatable about the axis, including a circle surrounding the axis and defining an inner a peripheral wall of the hole, and a plurality of openings and a plurality of accommodating grooves which are disposed radially outward from the inner ring surface of the peripheral wall and are located at one end of the inner hole and communicate with each other, and each of the accommodating grooves is respectively provided by a groove bottom surface away from the opening And a pivoting portion connecting the bottom surface of the groove and the opening and having a circular shape; a driving member supported by the spindle unit and rotatable about the axis, including a protruding into the inner hole and facing a ratchet ring of the accommodating groove, the ratchet ring has a plurality of ratchet teeth, each ratchet tooth has a driving surface; a pawl group includes a plurality of pawls, each pawl having a circular diameter and the pivot a pivoting portion of the pivoting portion, a claw extending from the pivoting portion through the opening for engaging the driving surface of the ratchet ring, and a slot disposed in the claw portion; and an elastic member a set comprising a plurality of elastic members respectively mounted between the receiving slots and the pawls And each elastic member has a insert piece mounted on the slot and tightly engaging with each other, and a spring extending from the insert piece to the bottom surface of the groove Offset. The easy-to-assemble outer claw-type ratchet hub according to claim 1, wherein each of the pawls further has a first side and a second side in opposite directions, the slot communicating with the first One side and the second side. The easy-to-assemble outer claw-type ratchet hub according to claim 1 or 2, wherein each elastic member further has a flexible piece between the blade and the elastic plate. .