CN2924157Y - Cam shaft for automobile wheel brake - Google Patents
Cam shaft for automobile wheel brake Download PDFInfo
- Publication number
- CN2924157Y CN2924157Y CN 200620074819 CN200620074819U CN2924157Y CN 2924157 Y CN2924157 Y CN 2924157Y CN 200620074819 CN200620074819 CN 200620074819 CN 200620074819 U CN200620074819 U CN 200620074819U CN 2924157 Y CN2924157 Y CN 2924157Y
- Authority
- CN
- China
- Prior art keywords
- camshaft
- cam
- curved surface
- axle journal
- spline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Braking Arrangements (AREA)
Abstract
The utility model relates to a camshaft used by the leading and trailing shoe brake of the wheel of the car. The camshaft (2) consists of a spline (13), a journal (14) and a cam (15) which consists of a positioning surface (22), a cylindrical surface (16), a plane (23), a work curved surface (17), a transition arc surface (18), a work curved surface (21), a transition arc surface (20) and an end surface (19). The generatrixes of the work curved surface (17) of the externally convex arc surface, the work curved surface (21), the transition arc surface (18) of the internally concave arc surface and the transition arc surface (20) are parallel to the central line of the journal (14); the cam (15) is non-symmetrical involute structure. The camshaft (20) has the advantages of that the cam (15) makes the brake force produced by the two braking shoe approximately equal to each other and the abrasion of the friction piece tend to more uniform.
Description
Technical field:
A kind of automotive wheel break of the utility model relates to the camshaft that the automotive wheel neck uses with camshaft from shoe drum brake.
Background technique:
Former automotive wheel neck is from shoe drum brake, the general symmetric type camshaft that adopts, camshaft is centered close on the line at roller center of two brake shoes, in the process of break braking, brake chamber drives the camshaft rotation by modulation arm, the roller of two brake shoes rolls on two working curved surfaces of camshaft respectively, thereby driving two brake shoes outwards opens with identical speed simultaneously, friction plate is contacted with brake drum and produce drag friction power, reach the purpose of braking, but because in the working procedure of camshaft, the active force that the neck hoof is subjected to makes the neck hoof that the trend that continues to magnify be arranged, just produced a self energizing effort, the trend that continues to reduce has been arranged, just produced one from subtracting power and make from hoof from the active force that hoof is subjected to, therefore cause two hoof inhomogeneous to the unit pressure of brake drum, the braking force of neck on the hoof is greater than the braking force from the hoof, thereby makes the wearing and tearing of brake strip also just inhomogeneous, and the wearing and tearing of neck hoof are greater than the wearing and tearing from hoof.Therefore, the structure of tackling above-mentioned camshaft makes improvements design.
Summary of the invention:
The purpose of this utility model provides a kind of automotive wheel break camshaft, adopt the camshaft of asymmetric involute shape structure, make the relative camshaft of the roller line of centres center of two brake shoes be offset certain distance to the inside, equate that it is even that friction disc wear more becomes thereby the braking force that two brake shoes are produced is approaching.
A kind of automotive wheel break camshaft, camshaft (2) is made up of spline (13), axle journal (14) and cam (15), it is characterized in that the standard pitch circle of spline (13) is coaxial with axle journal (14); Axle journal (14) is cylindrical; Cam (15) is made up of locating face (22), cylndrical surface (16), plane (23), working curved surface (17), transition circle cambered surface (18), working curved surface (21), transition circle cambered surface (20) and end face (19), cam (15) is an asymmetric involute shape structure, the transition circle cambered surface (18) of the working curved surface of outer convex arc surface (17), working curved surface (21) and interior concaved circular cambered surface, transition circle cambered surface (20), their bus is parallel to the center line of axle journal (14); Locating face (22) perpendicular to axle journal (14) center line contacts with brake backing plate (1); It is coaxial with axle journal (14) to be positioned at the inboard cylndrical surface (16) of working curved surface (17) and working curved surface (21); The end face (24) in the locating face (22) of cam (15), plane (23), end face (19) and spline (13) outside is respectively all perpendicular to axle journal (14) center line.
For ease of effect and the working principle of explanation camshaft in break, at first as follows to the structure and the working condition brief introduction of break:
Referring to Fig. 6: break is mainly by brake backing plate (1), camshaft (2), neck hoof (3), friction plate (4), roller shaft (5), roller (6), supporting axle (7), form from hoof (8), friction plate (9), roller shaft (10), roller (11) and supporting axle (12).
Neck hoof (3) is installed on the brake backing plate (1) by supporting axle (7), neck hoof (3) can rotate around supporting axle (7), supporting axle (7) is fixed on the brake backing plate (1) by card, two identical friction plates (4) are being led on the hoof (3) by rivet, roller shaft (5) passes the attachment hole of neck hoof (3), and roller (6) is installed on the neck hoof (3).Equally, be installed on the brake backing plate (1) by supporting axle (12) from hoof (8), can rotate around supporting axle (12) from hoof (8), supporting axle (12) is fixed on the brake backing plate (1) by card, two identical friction plates (9) by rivet from hoof (8), roller shaft (10) passes from the attachment hole of hoof (8), and roller (11) is installed in from hoof (8), and both are installed together supporting axle (7) and supporting axle (12) side by side.Braking bottom board (1) is installed on the bridge of front and back, camshaft (2) is installed in the corresponding matching hole of brake backing plate (1), the hard-over of camshaft (2) is 135 degree, when brake chamber drives camshaft (2) when clockwise rotating by adjusting arm, working curved surface (21) the promotion roller (6) of camshaft (2), roller shaft (5), neck hoof (3), friction plate (4) move, friction plate (4) is contacted with brake drum, reach the purpose of braking.Simultaneously, the working curved surface (17) of camshaft (2) promotion roller (11), roller shaft (10), neck hoof (8), friction plate (9) move, and friction plate (9) is contacted with brake drum, reach the purpose of braking.
A kind of automotive wheel break of the utility model camshaft is the camshaft of asymmetric involute shape structure, make the roller line of centres of above-mentioned two brake shoes be offset certain distance to the inside with respect to the camshaft center, its objective is that the braking force that two brake shoes are produced is approaching equal, it is even that the wearing and tearing of both sides friction plate more are tending towards.
A kind of automotive wheel break described in the utility model all is an involute with the profile line of two working curved surfaces on cam face on the camshaft, though the basic circle of these two involutes equates that the starting point of these two involutes is asymmetric.
Now, the structure of a kind of automotive wheel break of the utility model with camshaft is described as follows:
This camshaft is made up of spline, axle journal and cam.
Spline is connected with the adjustment arm, and brake chamber clockwise rotates by adjusting arm drive spline, and the spline standard pitch circle on the camshaft is coaxial with axle journal, and there is end face in the spline outside.
Axle journal is cylindrical.
Cam is mainly by locating face, cylndrical surface, plane, two corresponding working curved surfaces, two corresponding transition circle cambered surfaces, and end face is formed.
Two working curved surfaces are outer convex arc surface, and two transition circle cambered surfaces that are connected with two working curved surfaces are interior concaved circular cambered surface respectively, and the bus of two working curved surfaces and two transition circle cambered surfaces is parallel to the center line of axle journal.The locating face of cam contacts with brake backing plate perpendicular to journal axis, and the locating face of cam is used for determining the tram of two working curved surfaces.Be shaped on the cylndrical surface coaxial respectively two working curved surface inboards with axle journal.The plane is perpendicular to journal axis on the cam, and the width of two working curved surfaces can be controlled in the position, plane on the cam.
Respectively perpendicular to the center line of axle journal, on two end faces, be manufactured with technical face respectively at the end face at the two ends of camshaft.
A kind of automotive wheel break of the utility model is because the cam on the camshaft has adopted asymmetric involute shape structure with the advantage of camshaft, make the relative camshaft of the roller line of centres center of two brake shoes be offset certain distance to the inside, the braking force that two brake shoes are produced is approaching to equate that then the wearing and tearing to the friction plate on two brake shoes more become even.
Description of drawings:
Fig. 1: be this a kind of automotive wheel break camshaft (2) schematic three dimensional views.
Fig. 2: be the additional schematic three dimensional views of this camshaft (2) other direction.
Fig. 3: be this camshaft (2) plan view.
Fig. 4: be this camshaft (2) plan view.
Fig. 5: be this camshaft (2) left view.
Fig. 6: be this camshaft (2) mounting point schematic representation in break.
Embodiment:
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.
Spline (13) is connected with the adjustment arm, and the standard pitch circle of spline (13) is coaxial with axle journal (14), and the end face (24) in spline (13) outside is perpendicular to axle journal (14) center line.
Axle journal (14) is cylindrical.
Cam (15) is made up of locating face (22), cylndrical surface (16), plane (23), working curved surface (17), transition circle cambered surface (18), working curved surface (21), transition circle cambered surface (20), end face (19).
Working curved surface (17) and working curved surface (21) are outer convex arc surface; Transition circle cambered surface (18) and transition circle cambered surface (20) are interior concaved circular cambered surface, the bus of working curved surface (17), working curved surface (21), transition circle cambered surface (18), transition circle cambered surface (20) is parallel to the center line of axle journal (14), and the involute base circle diameter (BCD) of working curved surface (17) is between 15m to 40mm; The involute base circle diameter (BCD) of working curved surface (21) is between 15m to 40mm.
The end face (19) of cam (15) and locating face (22) are all perpendicular to the center line of axle journal (14); Locating face (22) contacts with brake backing plate (1), is used for determining the tram of working curved surface (17) and working curved surface (21).
Be weight reduction, be manufactured with cylndrical surface (16) respectively in the inboard of working curved surface (17) and working curved surface (21), cylndrical surface (16) are coaxial with axle journal (14).The outside diameter of cylndrical surface (16) is between 40mm to 100mm, and the diameter of axle journal (14) is between 25mm to 55mm.
Plane (23) on the cam (15) is perpendicular to axle journal (14) center line, and position, plane (23) can Control work curved surface (17) and the width of working curved surface (21).
The end face (24) in spline (13) the one ends outside is perpendicular to axle journal (14) center line.On the end face (24) of the end face (19) of cam (15) and spline (13), be shaped on auxiliary hole.The outside diameter of spline (13) is between 24mm to 54mm, and the number of teeth of spline (13) is between 10 to 40, and the effective length of spline (13) is between 50mm to 80mm.
As shown in Figure 3, be the arc surface transition between the locating face (22) of axle journal (14) and cam (15); Also be the arc surface transition between the cylndrical surface (16) of cam (15) and plane (23).
As shown in Figure 5, the profile of working curved surface (17) is an involute shape, and the profile of working curved surface (21) also is an involute shape, and the profile line of above-mentioned working curved surface (17) and working curved surface (21) all is an involute, article two, the basic circle of involute equates, but the starting point of involute is asymmetric.
Claims (7)
1, a kind of automotive wheel break camshaft, camshaft (2) is made up of spline (13), axle journal (14) and cam (15), it is characterized in that the standard pitch circle of spline (13) is coaxial with axle journal (14); Axle journal (14) is cylindrical; Cam (15) is made up of locating face (22), cylndrical surface (16), plane (23), working curved surface (17), transition circle cambered surface (18), working curved surface (21), transition circle cambered surface (20) and end face (19), cam (15) is an asymmetric involute shape structure, the transition circle cambered surface (18) of the working curved surface of outer convex arc surface (17), working curved surface (21) and interior concaved circular cambered surface, transition circle cambered surface (20), their bus is parallel to the center line of axle journal (14); Locating face (22) perpendicular to axle journal (14) center line contacts with brake backing plate (1); It is coaxial with axle journal (14) to be positioned at the inboard cylndrical surface (16) of working curved surface (17) and working curved surface (21); The end face (24) in the locating face (22) of cam (15), plane (23), end face (19) and spline (13) outside is respectively all perpendicular to axle journal (14) center line.
2, a kind of automotive wheel break camshaft according to claim 1 is characterized in that being manufactured with auxiliary hole on the end face (24) of the end face (19) of cam (15) and spline (13).
3, a kind of automotive wheel break camshaft according to claim 1 is characterized in that being connected for the transition circle cambered surface between the locating face (22) of axle journal (14) and cam (15); Also for the transition circle cambered surface is connected, the outside diameter of cylndrical surface (16) is between 40mm to 100mm between the cylndrical surface (16) of cam (15) and plane (23).
4, a kind of automotive wheel break camshaft according to claim 1, the profile that it is characterized in that working curved surface (17) is an involute shape, its base circle diameter (BCD) is between 15mm to 40mm.
5, a kind of automotive wheel break camshaft according to claim 1, the profile that it is characterized in that working curved surface (21) is an involute shape, its base circle diameter (BCD) is between 15mm to 40mm.
6, a kind of automotive wheel break camshaft according to claim 1, the diameter of axle journal (14) that it is characterized in that camshaft (2) is between 25mm to 55mm.
7, a kind of automotive wheel break camshaft according to claim 1, the outside diameter that it is characterized in that spline (13) is between 24mm to 54mm, the number of teeth of spline (13) is between 10 to 40, and the effective length of spline (13) is between 50mm to 80mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620074819 CN2924157Y (en) | 2006-07-12 | 2006-07-12 | Cam shaft for automobile wheel brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620074819 CN2924157Y (en) | 2006-07-12 | 2006-07-12 | Cam shaft for automobile wheel brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2924157Y true CN2924157Y (en) | 2007-07-18 |
Family
ID=38260589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620074819 Expired - Fee Related CN2924157Y (en) | 2006-07-12 | 2006-07-12 | Cam shaft for automobile wheel brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2924157Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527680A (en) * | 2013-10-30 | 2014-01-22 | 十堰市华迪汽车零部件有限公司 | Drum brake for rear axle of lorry |
| CN109500717A (en) * | 2018-12-07 | 2019-03-22 | 泉州鲤城福辉汽车配件有限公司 | A kind of brake-toggle shaft production polishing clamping device |
-
2006
- 2006-07-12 CN CN 200620074819 patent/CN2924157Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527680A (en) * | 2013-10-30 | 2014-01-22 | 十堰市华迪汽车零部件有限公司 | Drum brake for rear axle of lorry |
| CN109500717A (en) * | 2018-12-07 | 2019-03-22 | 泉州鲤城福辉汽车配件有限公司 | A kind of brake-toggle shaft production polishing clamping device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: TAIZHOU SHENZHOU TRANSMISSION TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: TAIZHOU SHENLI VEHICLE AXLE CO., LTD. Effective date: 20121022 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121022 Address after: 225315 No. 9 Fenghuang West Road, Taizhou Economic Development Zone, Jiangsu, Taizhou Patentee after: TAIZHOU SHENZHOU TRANSMISSION TECHNOLOGY CO., LTD. Address before: 225315 No. 9 Fenghuang West Road, Taizhou Economic Development Zone, Jiangsu, Taizhou Patentee before: Taizhou Shenli Axle Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070718 Termination date: 20140712 |
|
| EXPY | Termination of patent right or utility model |