CN202091412U

CN202091412U - Left camshaft assembly for left brake of engineering vehicle

Info

Publication number: CN202091412U
Application number: CN2011201876128U
Authority: CN
Inventors: 丁志明; 薛成阳; 钟厚波; 池兆威
Original assignee: TAIZHOU SHENLI AXLE CO Ltd
Current assignee: TAIZHOU SHENZHOU TRANSMISSION TECHNOLOGY CO., LTD.
Priority date: 2011-05-30
Filing date: 2011-05-30
Publication date: 2011-12-28
Anticipated expiration: 2021-05-30

Abstract

The utility model discloses a left camshaft assembly for the left brake of an engineering vehicle and relates to the field of the camshaft assemblies used in the leading trailing shoe drum brake of the engineering vehicle. A bushing (10) installed on a smooth axle (9) of a left camshaft contacts with a camshaft base (4); the smooth axle (9) is installed in the bottom plate camshaft installing hole (16) of a left brake bottom plate (11) and the air chamber bracket camshaft installing hole (17) of a left air chamber bracket (12) in a penetration way; a camshaft spline (7) is installed in an inner spline hole (18) of a left adjusting arm (13) in the penetration way; an adjusting spacer (14) is installed between the left air chamber bracket (12) and the left adjusting arm (13); and a snap spring is clamped in a camshaft snap spring groove (8). By adopting the left camshaft assembly for the left brake of the engineering vehicle, friction discs on a leading shoe and a trailing shoe are synchronously abraded, so that the brake efficacy of the brake is improved.

Description

The left cam assembly of engineering truck left side break

Technical field

The utility model engineering truck left side break relates to the cam assembly field of using at the engineering truck neck from shoe drum brake with left cam assembly.

Background technique

Left break and right break are installed on engineering truck, left side break and right break structure are the mirror image symmetric relation, left brake backing plate, left camshaft, left air chamber support and a left side are installed on left break adjust arm, constitute left break cam assembly, and being installed, right camshaft, right brake backing plate, right air chamber support and the right side adjust arm on right break, constitute right brake toggle shaft assembly, the right break cam assembly of left break on the break of a left side on cam assembly and the right break, both structures are the mirror image symmetric relation.Left side break is with the neck hoof that left break is installed on the left cam assembly with from hoof, right break is with the neck hoof that right break is installed on the right cam assembly with from hoof, therefore, illustrate and known left break that engineering truck uses structure, also just can illustrate and know the right break used on the engineering truck structure with right cam assembly with left cam assembly.

Summary of the invention

The purpose of this utility model provides the left cam assembly of a kind of engineering truck left side break, it is by left camshaft, left side brake backing plate, a left side air chamber support and a left side are adjusted arm and are formed single piece, in the base plate camshaft mounting hole of left brake backing plate, left camshaft is installed, in the hoof pin-and-hole of left brake backing plate, be coated with the hoof pin, make the neck hoof and be installed on the brake backing plate from hoof, and with the optical axis of the fixing left camshaft of left air chamber support, adjust arm with a left side and regulate left camshaft, with reach the cam that makes left camshaft can push open asymmetricly on the left break the neck hoof and from the purpose of hoof.

The left cam assembly of engineering truck left side break, it is made up of left camshaft, left brake backing plate, left air chamber support, left side adjustment arm, adjustment pad and jump ring, and lining is installed on the optical axis of left camshaft, and contacts with the camshaft base of left camshaft; The optical axis of left side camshaft is installed in the base plate camshaft mounting hole of left brake backing plate, and optical axis also is installed in the air chamber support camshaft mounting hole of left air chamber support, and the camshaft spline of left camshaft is installed on a left side and adjusts in the inner splined hole of arm; The adjustment pad is installed on the optical axis, adjusts pad and adjusts between the arm at a left air chamber support and a left side, adjusts gap between left air chamber support and the left side adjustment arm; Jump ring is installed in the camshaft jump ring groove of left camshaft, prevents left camshaft axial float.

The left cam assembly of the utility model engineering truck left side break, before engineering truck is braked, a left side on the cam of camshaft from hoof cam concave surface and neck hoof cam concave surface respectively with the neck hoof on neck hoof roller and contacting still from the hoof from the hoof roller, and when braking, can make a left side adjust arm by the braking system on the engineering truck rotates widdershins, owing in the adjustment arm inner splined hole of left side adjustment arm, the camshaft spline that is connected with on the left camshaft is installed, thereby can drive left camshaft rotates simultaneously widdershins, contacting respectively with from hoof roller and neck hoof roller on the then left camshaft from hoof cam convex surface and neck hoof cam convex surface, thereby, can make from hoof and neck hoof and open, produce braking force by neck hoof and the friction plate from hoof, after braking process finishes, a left side is adjusted arm and is not stressed, make the neck hoof and be subjected to returning place force from hoof, get back to the initial position state again, clockwise rotate by leading the hoof roller and driving left camshaft from the hoof roller, then make a left side adjust arm and also get back to original state, the above-mentioned working principle that is engineering truck left side break with left cam assembly.

The utility model engineering truck left side break with left cam assembly advantage is: the cam on the left camshaft from hoof cam concave surface, from hoof cam convex surface respectively with neck hoof cam concave surface, lead hoof cam convex surface inequality.Engineering truck is in actual braking process, the neck hoof is because the growth trend effect of braking moment, the braking force that is subjected on its per surface area is strengthened, from hoof since the braking moment that the gesture effect is subjected to its per surface area that subtracts of braking moment reduce, because the neck hoof and from the hoof on the unit area suffered braking force unequal, its difference will be born by hub bearing, for a long time after the braking, the wearing and tearing of the friction plate on the neck hoof are more serious than the wearing and tearing of the friction plate from hoof, then just have influence on vehicle braked usefulness.Now, on the cam of a left side on the camshaft from hoof cam concave surface with neck hoof cam concave surface, adopted non-symmetry structure from hoof cam convex surface and neck hoof cam convex surface, can balance neck hoof and from the suffered power of hoof upper friction plate unit area, so just reduced the power that hub bearing bears, and, can make the neck hoof and can wear and tear synchronously, like this, just improve and stablized the Braking efficiency of break from the hoof upper friction plate.

Description of drawings

Fig. 1: engineering truck left side break is with the schematic three dimensional views of left camshaft 1 one side directions.

Fig. 2: engineering truck left side break is with the schematic three dimensional views of left camshaft 1 other side direction.

Fig. 3: engineering truck left side break is installed in left cam assembly and leads hoof and the scheme of installation from the hoof.

Fig. 4: engineering truck left side break is with left cam assembly three-dimensional exploded perspective view.

Embodiment

Referring to each accompanying drawing, the left cam assembly of engineering truck left side break, it is adjusted arm 13, adjustment pad 14 and jump ring 15 by left camshaft 1, left brake backing plate 11, left air chamber support 12, a left side and forms, lining 10 is installed on the optical axis 9 of left camshaft 1, and contacts with the camshaft base 4 of left camshaft 1; The optical axis 9 of left side camshaft 1 is installed in the base plate camshaft mounting hole 16 of left brake backing plate 11, optical axis 9 also is installed in the air chamber support camshaft mounting hole 17 of left air chamber support 12, and the camshaft spline 7 of left camshaft 1 is installed on a left side and adjusts in the inner splined hole 18 of arm 13; Adjustment pad 14 is installed on the optical axis 9, adjusts pad 14 and adjusts between the arm 13 at a left air chamber support 12 and a left side, adjusts gap between left air chamber support 12 and the left side adjustment arm 13; Jump ring 15 is installed in the camshaft jump ring groove 8 of left camshaft 1, prevents left camshaft 1 axial float.

Referring to Fig. 1 and Fig. 2, the cam on the left camshaft 1 adopts the asymmetric structure, and is unequal with neck hoof cam concave surface 5 both indent areas from hoof cam concave surface 2, unequal with neck hoof cam convex surface 6 both evagination areas from hoof cam convex surface 3.

Optical axis 9 diameters of left side camshaft 1 are: 40mm, length is: 335 millimeters.

Camshaft spline 7 parameters of left side camshaft 1 are: base circle diameter (BCD): 32.478 millimeters, the number of teeth: 25, modulus: 1.5, mounting type is: the flank location, big footpath diameter is: 39 millimeters, the path diameter is: 35.25 millimeters, standard pitch diameter is: 37.5 millimeters, camshaft spline 7 effective lengths are between 50 millimeters to 70 millimeters.

Left side camshaft 1 be involute from hoof cam convex surface 3 and neck hoof cam convex surface 6 profiles, the basic circle of these two involutes equates that base circle diameter (BCD) is: 25 millimeters, but the starting point of described these two involutes is asymmetric.

A left side camshaft 1 from hoof cam concave surface 2 profile radiuses be: 53.7 millimeters, from hoof cam concave surface 5 profile radiuses be: 16.5 millimeters to 27.6 millimeters.

Optical axis 9 two ends of left side camshaft 1 are connected with camshaft spline 7 and cam respectively, have a circle camshaft jump ring groove 8 in camshaft spline 7 outer ends; Described cam is by the single piece of forming whole asymmetric cam structure from hoof cam concave surface 2, from hoof cam convex surface 3, neck hoof cam concave surface 5, neck hoof cam convex surface 6 and camshaft base 4.

Referring to Fig. 3, neck hoof roller pin 24 high-ranking military officer's hoof rollers 21 are fixed on the neck hoof 19, will be fixed on from hoof 20 from hoof roller 22 from hoof roller pin 25; In the hoof pin-and-hole 23 of left brake backing plate 11, be coated with the hoof pin, make neck hoof 19 and be installed in respectively on the left brake backing plate 11 from hoof 20.

Claims

1. the left cam assembly of engineering truck left side break, it is adjusted arm (13), adjustment pad (14) and jump ring (15) by left camshaft (1), left brake backing plate (11), left air chamber support (12), a left side and forms, it is characterized in that lining (10) is installed on the optical axis (9) of left camshaft (1), and contact with the camshaft base (4) of left camshaft (1); The optical axis (9) of left side camshaft (1) is installed in the base plate camshaft mounting hole (16) of left brake backing plate (11), optical axis (9) also is installed in the air chamber support camshaft mounting hole (17) of left air chamber support (12), and the camshaft spline (7) of left camshaft (1) is installed on a left side and adjusts in the inner splined hole (18) of arm (13); Adjustment pad (14) is installed on the optical axis (9), adjusts pad (14) and is positioned between left air chamber support (12) and the left side adjustment arm (13), adjusts gap between left air chamber support (12) and the left side adjustment arm (13); Jump ring (15) is installed in the camshaft jump ring groove (8) of left camshaft (1), prevents left camshaft (1) axial float.

2. the left cam assembly of engineering truck left side break according to claim 1, the cam that it is characterized in that left camshaft (1) adopts the asymmetric structure, unequal from hoof cam concave surface (2) with both indent areas of neck hoof cam concave surface (5), unequal from hoof cam convex surface (3) with both evagination areas of neck hoof cam convex surface (6).

3. the left cam assembly of engineering truck left side break according to claim 1, it is characterized in that optical axis (9) diameter of left camshaft (1) is: 40 millimeters, length is: 335 millimeters.

4. the left cam assembly of engineering truck left side break according to claim 1, camshaft spline (7) parameter that it is characterized in that left camshaft (1) is: base circle diameter (BCD): 32.478 millimeters, the number of teeth: 25, modulus: 1.5, mounting type is: the flank location, and big footpath diameter is: 39 millimeters, the path diameter is: 35.25 millimeters, standard pitch diameter is: 37.5 millimeters, camshaft spline (7) effective length is between 50 millimeters to 70 millimeters.

5. the left cam assembly of engineering truck left side break according to claim 1, what it is characterized in that left camshaft (1) is involute from hoof cam convex surface (3) and neck hoof cam convex surface (6) profile, the base circle diameter (BCD) of these two involutes is: 25 millimeters, but the starting point of described these two involutes is asymmetric.

6. the left cam assembly of engineering truck left side break according to claim 1, what it is characterized in that left camshaft (1) from hoof cam concave surface (2) profile radius is: 53.7 millimeters, neck hoof cam concave surface (5) profile radius is: 16.5 millimeters to 27.6 millimeters.

7. the left cam assembly of engineering truck left side break according to claim 1, it is characterized in that being connected with camshaft spline (7) and cam respectively, have a circle camshaft jump ring groove (8) in camshaft spline (7) outer end at optical axis (9) two ends of left camshaft (1); Described cam is by the single piece of forming whole asymmetric cam structure from hoof cam concave surface (2), from hoof cam convex surface (3), neck hoof cam concave surface (5), neck hoof cam convex surface (6) and camshaft base (4).