CN2318123Y - Bicycle central cam expanding brake type brake - Google Patents
Bicycle central cam expanding brake type brake Download PDFInfo
- Publication number
- CN2318123Y CN2318123Y CN 98208923 CN98208923U CN2318123Y CN 2318123 Y CN2318123 Y CN 2318123Y CN 98208923 CN98208923 CN 98208923 CN 98208923 U CN98208923 U CN 98208923U CN 2318123 Y CN2318123 Y CN 2318123Y
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- CN
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- cam
- braking
- central cam
- brake
- bicycle
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- Expired - Fee Related
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Abstract
The utility model relates to an expanding brake type brake with a central cam for a bicycle. Two to four cam segments of the same lift range are uniformly distributed on a cam which can swing around an axle shaft, a support block which is lined with a friction plate is closely butted on the cam segments, and a frictional braking pair is formed from the friction plate and the circumferential inner wall of a wheel boss. During braking, a draw rod can drive a central cam to rotated by manually pulling a line, and the friction plate can tightly press the inner wall of the wheel boss along with the opening of the support block, so that wheels can decelerate or even stop rotating. Braking elements are sealed in a cavity body; the brake has large braking friction area, uniform braking force distribution, reliable braking, durability, and simple and reasonable structure. The utility model can be conveniently used for bicycles of various model numbers.
Description
The utility model belongs to the bicycle brake parts.
The braking great majority of existing bicycle adopt two shoe brake skins to be pressed against on the rim, also have by supporting strap friction lining is held tightly " band-type brake " formula of axletree and friction lining opened " expanding brake " formula structure that compresses the wheel hub inwall by the cam that is positioned at the friction lining end.Said structure exists brake friction area little respectively, and braking force is inhomogeneous, and exposed fragile and braking element is owed firm and made the insecure defective of braking.The two cams biasing of patent No. ZL92223417.5 " bicycle twin cam expanding brake ", structure is complicated.
The utility model is the defective that overcomes prior art, and it is reliable to design a kind of braking, simple and reasonable for structure, robust new bicycle drg.
The technical solution of the utility model is: form a sealing arrangement independently by pull bar, wheel hub, reaction plate, central cam, bracer, friction lining, spring etc., can be around uniform 2 to 4 the identical cam segments of lift of outer rim of the central cam of axle swing, nestle up the bracer that an end and reaction plate pivotally attached are lined with friction lining on the respective cams section, friction lining and wheel hub inwall are formed friction braking pairs.Pull bar can be around axle swing, and one end and central cam biasing are hinged, and the other end links to each other with the hand brake backguy, and the amplitude of pull bar swing is limited by the kidney slot hole on the reaction plate.Reaction plate be fastened on the vehicle frame and constitute with wheel hub in the annular seal space of central cam, friction braking pairs and retracing spring etc. is arranged.Wheel hub is hollow " worker " font cylinder, and the profile of small end and central sections is identical with former cycle hub, holds the mounting hole of the uniform bicycle steel wire of outer rim greatly, and circumferential inner wall is the secondary brake wheel of braking.Adopt the single-row radial ball bearing supporting between axletree and the wheel hub.
The friction braking area of this drg is big, and brakig force distribution is even, braking element sealing, thereby brake reliably, durable and simple and reasonable for structure, can be advantageously used on the bicycle of various models.
Now be further described with embodiment.
Fig. 1 is a three-chip type drg schematic diagram, among the figure: 1 bicycle steel wire mounting hole, 2 bracers, 3 central cam, 4 axletrees, 5 cam returning springs, 6 bracer screws, 7 bracer retracing springs, 8 pull bars, 9 reaction plates, 10 screws, 11 friction linings, A kidney slot hole, B friction lining and the gap of circumference of hub inwall when non-braking mode, the fastening mounting hole of C reaction plate.
Central cam 3 and axletree 4 bearing fits are by reaction plate 9 warp-wises location, uniform 3 cam segments that lift is identical of the outer rim of central cam.Be positioned at the outside of reaction plate 9 with axletree 4 pivotally attached pull bars 8, its upper end is hinged with the screw 10 that is fixed on the central cam, the lower end links to each other with the manual brake pulling wire of bicycle, the pendulum angle of pull bar is limited by the kidney slot hole A on the reaction plate, the retracing spring of cam returning spring 5 and bicycle brake backguy resets pull bar and cam, bracer retracing spring 7 keeps the bracer inner edge near cam segment, makes friction lining and circumference of hub inwall keep a gap B.3 bracers 2 are housed in that the periphery of cam segment is corresponding, the its inner rim curve is identical with cam segment, outer rim is that axletree concentric circles contour and the end that removable friction lining 11 bracers are housed are hinged with screw 6 and reaction plate 9, and bracer can rotate around screw 6, and retracing spring 7 makes the bracer inner edge nestle up cam segment.Reaction plate 9 on the wheel hub outer face is fastened on the vehicle frame by axletree 4 location and with the C hole, and it and wheel hub constitute an annular seal space.
Fig. 2 radially schemes for drg, and the profile in its left end and stage casing is identical with former bicycle, and the right-hand member outer rim is evenly equipped with the mounting hole of bicycle steel wire, the corresponding shortening of steel wire length.
Fig. 3 is 4 chip drg schematic diagrams.
Fig. 4 is 2 chip drg schematic diagrams.
When non-braking mode, pull bar is positioned at plumbness, and bracer is close on the camming surface, and friction lining and circumference of hub inwall keep a gap B, and wheel can freely rotate.Glancing impact, hand is pinched clamp pin, brake pulling wire clockwise rotates pull bar along axletree, make cam along with clockwise rotating by the biasing screw on the cam, the camstroke section makes bracer rotate outward around the axle center of one end and opens, friction lining promptly contacts with the wheel hub inwall, and the friction force of generation forces the wheel hub in the rotation---and wheel decelerates and even stall reach the braking purpose.Take-off the brake is pinched handle, and retracing spring makes bracer, cam, and pull bar is got back to non-braking mode, and friction lining disengages with the wheel hub inwall rapidly, ends to brake.The rotational angle of cam is not only guaranteed effective braking but also can be prevented excessively compressing and accidental damage of friction pair by the restriction of the kidney slot hole A on the reaction plate.Gap B between friction pair is regulated by the coupling nut of backguy and pull bar.When the friction lining undue wear, only need pull down reaction plate, therefrom take out bracer, more renew to load onto again behind the friction lining and get final product.Camstroke section, the bracer surface of pasting mutually with cam segment and as the wheel hub inwall of friction pair through cure process, and, prevent that rainwater and sand and dust from entering wherein by hermetically sealed, guarantee that braking is reliable and sturdy and durable.
Entrucking through sample is on probation, proves to have reached Expected Results.
Claims (3)
1, a kind of bicycle central cam bloated switch type braker, form by pull bar, wheel hub, reaction plate, central cam, bracer, friction lining, spring etc., it is characterized in that can be on the central cam outer rim of axle swing uniform 2 to 4 identical cam segments of lift, nestle up the bracer that an end and reaction plate pivotally attached are lined with friction lining on corresponding cam segment, friction lining and wheel hub inwall are formed friction braking pairs.
2, bicycle central cam bloated switch type braker according to claim 1, it is characterized in that pull bar can be around axle swing, one end and central cam biasing are hinged, and the other end links to each other with the hand brake backguy, and the amplitude of swing is limited by the kidney slot hole on the reaction plate.
3, bicycle central cam bloated switch type braker according to claim 1, it is characterized in that reaction plate is fastened on the vehicle frame and constitute with wheel hub in the annular seal space of central cam, friction braking pairs and retracing spring etc. is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98208923 CN2318123Y (en) | 1998-04-11 | 1998-04-11 | Bicycle central cam expanding brake type brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98208923 CN2318123Y (en) | 1998-04-11 | 1998-04-11 | Bicycle central cam expanding brake type brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2318123Y true CN2318123Y (en) | 1999-05-12 |
Family
ID=33964486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98208923 Expired - Fee Related CN2318123Y (en) | 1998-04-11 | 1998-04-11 | Bicycle central cam expanding brake type brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2318123Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425877C (en) * | 2007-06-13 | 2008-10-15 | 哈尔滨工程大学 | Speed-reducing mechanism of torqued spring driving hinge |
-
1998
- 1998-04-11 CN CN 98208923 patent/CN2318123Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425877C (en) * | 2007-06-13 | 2008-10-15 | 哈尔滨工程大学 | Speed-reducing mechanism of torqued spring driving hinge |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |