CN205350161U - Lever automatic adjustment arm - Google Patents

Abstract

The utility model discloses a lever automatic adjustment arm has solved at the braking in -process, and the radial force of adjustment shift fork when the axial links repeatedly is located on the worm, and the stability of the adjustment arm when making the brake descends, and its technical scheme main points are: including adjustment arm casing, be equipped with worm wheel and worm in the adjustment arm casing, worm wheel and worm intermeshing, the stalk portion of adjustment arm casing is equipped with the pinhole, and the pinhole is connected through a big round pin axle and an adjustment shift fork, and the adjustment shift fork is used for the lever connection that shifts through little round pin axle with one, and the square pole is adopted to the upper end of lever, and the lower extreme is through the shaping round die -pin of forge hot, adjusts arm casing side and is equipped with the vertical installation hole, and parallel to the side of the upper end of lever and the casing stalk portion, the lower extreme passes the vertical installation hole, the lower extreme of lever is equipped with the cylinder rack, gear connection on cylinder rack and the worm has reached by the lever, has adjusted shift fork and adjustment control clutch realization compensation excess clearance, has improved the effect of adjusting arm stability when braking.

Description

Lever automatic adjusting arm

Technical field

This utility model relates to automobile technical field, more specifically, it relates to a kind of lever automatic adjusting arm.

Background technology

Automotive brake is one of vitals on automobile, automobile is in the process of moving, generally require and use brake continually, shoe brake in brake is gradually increased because of the gap between abrasion and brake drum, thus when causing braking retardation, sideslip, poor stop, brake difference etc., the automatic adjusting arm in brake is just used to regulate the vitals in shoe brake gap.

At present, braking adjusting arm on market is divided into automatic adjusting arm and hand regulation arm, and arm for adjusting automobile brake clearance automatically circulates in the world just thousands of kinds, such as, application number be 200720191381.1 Chinese patent disclose a kind of arm for adjusting automobile brake clearance automatically assembly, including brake arm and be located at the main worm-and-wheel gear within brake arm, spring pretightening mechanism, free-wheeling assembly, shift fork guiding mechanism, main worm-and-wheel gear includes main worm gear and main worm screw, described main worm gear and main worm screw are in engagement all the time, described shift fork guiding mechanism includes adjusting lever and adjusts shift fork, described spring pretightening mechanism is arranged on one end of main worm screw, described free-wheeling assembly is arranged on main worm screw, described free-wheeling assembly can link with shift fork guiding mechanism, described spring pretightening mechanism is made up of Rectangular Spring I and end cap I, described Rectangular Spring I is arranged on one end of main worm screw by end cap I, described free-wheeling assembly is by Rectangular Spring II, gear and end cap II composition, described main worm screw is multidiameter structure, described gear is T-shaped, it is provided externally with straight-tooth, described gear is contained on main worm screw, described Rectangular Spring II is arranged on outside gear and main worm screw, Rectangular Spring II and gear are fixed in brake arm by end cap II by the other end of described main worm screw, described adjustment shift fork bottom is provided with the sawtooth of corresponding straight-tooth, described sawtooth and straight-tooth are fitted together to mutually, described straight-tooth spacing is more than single tooth width, described jaggy pitch is more than single straight-tooth width.

After this scheme is contacted with straight-tooth again by sawtooth, gear starts to reversely rotate, now gear, Rectangular Spring II, main worm screw three link, the main worm screw causing rotation drives main worm gear, main worm screw is in slipping state, the brake clearance of main worm gear wheel and then correction drum brake in one end of Rectangular Spring I；Although the program simplifies the internal structure of arm for adjusting automobile brake clearance automatically assembly, the working strength of the parts of each mechanism is low, owing to vehicle it is frequently necessary to braking, in the process of braking, adjust the shift fork radial force when axially repeatedly linking and be seated on main worm screw, the stability adjusting arm when making brake is so set and declines.

Utility model content

For the deficiency of prior art existence, the purpose of this utility model is in that to provide one by lever, connect and draw fork and adjustment to control clutch realization compensation excess gap, adjusts the lever automatic adjusting arm of arm stability when improve brake.

For achieving the above object, this utility model provides following technical scheme:

A kind of lever automatic adjusting arm, including adjusting arm housing, it is provided with worm gear and worm screw in described adjustment arm housing, described worm gear and worm screw engage each other, the shank of described adjustment arm housing is provided with pin-and-hole, pin-and-hole connects adjustment shift fork by big bearing pin, adjust shift fork and connect displacement lever by small clevis pin with head, big bearing pin on described adjustment shift fork and small clevis pin with head are on an axis, the upper end of described lever adopts square pole, lower end is circle pressure pin hot forging forming, described adjustment arm housing side is provided with vertical installing hole, the upper end of lever and the flat shape in shank side adjusting arm housing, the vertical installing hole that lower end is described with traverse, the lower end of lever is provided with cylinder tooth bar, described cylinder tooth bar is connected with clutch.

So arrange, during brake, adjust shift fork and drive lever, lever drive one-way clutch and then control worm gear, worm gear controls camshaft again, it is achieved the adjustment to the excess gap between friction plate and brake drum, when braking by arranging described lever connected mode, eliminate and adjust the shift fork radial direction lever force when axially-movable, when improve brake, adjust the stability of arm.

Arrange further: described round pressure pin and vertical installing hole outer end are provided with dust-proof sheath.

So arrange, owing to lever can move up and down when braking, adding sheath is possible to prevent some impurity to stick on lever, foreign material are avoided to be brought in tooth bar when lever is done manual work to cause tooth bar and the unnecessary damage of parts, prevent dust from entering vertical installing hole, for the dust-proof effect that vertical installing hole is good, extend automatic adjusting arm service life.

As preferably, described sheath material is oil resistant sizing material.

So arranging, due to the reciprocating motion that lever is regular, generally require and smear some oil in just topcoating, increase its lubricity, sheath material is preferably oil resistant sizing material.

Arrange further: described automatic adjusting arm also includes an oil nozzle, and described adjustment arm housing worm gear place is provided with the groove for installing oil nozzle, and described oil nozzle is connected in built-in groove by screw thread rotation.

So arrange, by oil nozzle is arranged on inside adjustment arm housing, some collisions of oil nozzle and exterior part can be avoided when installing or keep in repair, ensure the safety of oil nozzle.

Arrange further: described big bearing pin, small clevis pin with head are equipped with axis hole through the end, one end adjusting shift fork, and described axis hole is provided with the pin for blocking big bearing pin, small clevis pin with head skids off.

So arrange, be respectively cooperating with connecting lever, the convenient and simple axial location achieving big bearing pin, small clevis pin with head, it is prevented that axial float occurs for it by axis hole.

Arranging further: described pin includes spring and is fixed on the block of both ends of the spring, and described block can slide on axis hole, described pin and axis hole are coaxially disposed.

So arrange, by pressing block simultaneously, make spring-compressed, block is made to be placed in the axis hole of big bearing pin or small clevis pin with head, big bearing pin or small clevis pin with head can be made to realize installation or removal, it is fixed on inside the axis hole of bearing pin by pin, has deducted original pin and be connected with the independent of bearing pin, it is to avoid the worry of look round for pin.

In sum, during brake, lever is driven by adjusting shift fork, make lever drive one-way clutch and then control worm gear, worm gear controls its camshaft again, it is achieved the adjustment to the excess gap between friction plate and brake drum, when braking by arranging described lever connected mode, eliminate and adjust the shift fork radial direction lever force when axially-movable, when improve brake, adjust the stability of arm.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model；

Fig. 2 is the sectional view that worm and gear of the present utility model is overall；

Fig. 3 is the partial sectional view of side of the present utility model；

Fig. 4 is the partial sectional view of bearing pin and pin.

In figure: 1, adjust arm housing；2, worm gear；3, worm screw；4, pin-and-hole；5, shift fork is adjusted；6, lever；61, square pole；62, pressure pin is justified；7, vertical installing hole；8, big bearing pin；9, small clevis pin with head；10, cylinder tooth bar；11, sheath；12, axis hole；13, pin；131, block；132, spring；14, oil nozzle；15, groove.

Detailed description of the invention

Below in conjunction with drawings and Examples, this utility model is conducted further description.

As shown in Figures 1 to 4, a kind of lever 6 formula automatic adjusting arm, including adjusting arm housing 1, worm gear 2 and worm screw 3 it is provided with in described adjustment arm housing 1, described worm gear 2 and worm screw 3 engage each other, described adjustment arm housing 1 shank is provided with pin-and-hole 4, pin-and-hole 4 connects adjustment shift fork 5 by pin 13, adjust shift fork 5 and connect displacement lever 6 by small clevis pin with head 9, at big bearing pin 8, small clevis pin with head 9 is equipped with axis hole 12 through the end, one end adjusting shift fork 5, above-mentioned axis hole 12 is respectively cooperating with connecting block 131, by pressing block 131 simultaneously, spring 132 is made to compress, block 131 is made to be placed in the axis hole 12 of big bearing pin 8 or small clevis pin with head 9, big bearing pin 8 or small clevis pin with head 9 can be made to realize installation or removal, the axis hole 12 being fixed on bearing pin by pin 13 is internal, deduct original pin to be connected with the independent of bearing pin, avoid the worry of look round for pin, convenient and simple achieves big bearing pin 8, the axial location of small clevis pin with head 9, prevent it from axial float occurring.

The upper end of lever 6 is arranged to square pole 61, lower end is circle pressure pin 62 hot forging forming, described adjustment arm housing 1 side is provided with vertical installing hole 7, vertical installing hole 7 outer end is provided with and the sheath 11 of lever 6 socket, owing to lever 6 can move up and down when braking, adding sheath 11 is possible to prevent some impurity to stick on lever 6, foreign material are avoided to be brought in tooth bar when lever 6 is done manual work to cause tooth bar and the unnecessary damage of parts, prevent dust from entering vertical installing hole 7, for the dust-proof effect that vertical installing hole 7 is good, extend automatic adjusting arm service life；Due to the reciprocating motion that lever 6 is regular, generally requiring and smear some oil in just topcoating, increase its lubricity, the present embodiment sheath 11 material is preferably oil resistant sizing material.

In the present embodiment, upper end and the flat shape in housing shank side of lever 6 are set, lower end coordinates with described vertical installing hole 7, the round pressure pin 62 of the lower end of thick stick is provided with latch, form cylinder tooth bar 10, described cylinder tooth bar 10 is connected with clutch, during brake, adjust shift fork 5 and drive lever 6, lever 6 transmission one-way clutch and then control worm gear 2, worm gear 2 is at the camshaft controlled, realize the adjustment to the excess gap between friction plate and brake drum, when braking by arranging described lever 6 connected mode, eliminate and adjust the shift fork 5 radial direction lever 6 power when axially-movable, the stability of arm is adjusted when improve brake.

Described automatic adjusting arm also includes an oil nozzle 14, described adjustment arm housing 1 worm gear 2 place is provided with the groove 15 for installing oil nozzle 14, described oil nozzle 14 connects in built-in groove 15 by screw thread rotation, it is internal by oil nozzle 14 is arranged on adjustment arm housing 1, some collisions of oil nozzle 14 and exterior part can be avoided when installing or keep in repair, ensure the safety of oil nozzle 14.

During work, External Force Acting is adjusting on shift fork 5, promotes brake arm to rotate, and then drives the drum brake being connected with worm gear 2 to work, and when robot arm rotates, adjusts shift fork 5 and is also rotating, and then drive shifting on adjusting lever, towards brake arm external movement；Under steam chest push rod effect, automatic adjusting arm is around brake camshaft degree, braking steam chest pushrod movement direction is approximately straight line, by adjusting the linkage that shift fork 5, the adjustment arm of force and adjusting lever form, adjusting lever is forced to shift up while rotating with automatic adjusting arm under lever 6 power effect；In the process, braking corner is carried out perception by automatic adjusting arm, when braking release, adjusting lever produces downwards displacement, when automatic adjusting arm corner is more than design load, adjusting lever drives worm screw 3 to rotate, thus driving worm gear 2 to lag behind the return adjusting arm body when automatic adjusting arm return, position before making brake-toggle shaft occur relative to braking rotates a small angle makes braking corner reduce, it is achieved the function that excess gap is adjusted by automatic adjusting arm automatically.

The above is only preferred implementation of the present utility model, and protection domain of the present utility model is not limited merely to above-described embodiment, and all technical schemes belonged under this utility model thinking belong to protection domain of the present utility model.It should be pointed out that, for those skilled in the art, without departing from the some improvements and modifications under this utility model principle premise, these improvements and modifications also should be regarded as protection domain of the present utility model.

Claims (6)

1. a lever automatic adjusting arm, including adjusting arm housing (1), worm gear (2) and worm screw (3) it is provided with in described adjustment arm housing (1), described worm gear (2) and worm screw (3) engage each other, the shank of described adjustment arm housing (1) is provided with pin-and-hole (4), pin-and-hole (4) adjusts shift fork (5) by big bearing pin (8) with one and is connected, adjust shift fork (5) to be connected for the lever (6) conjugated with one by small clevis pin with head (9), it is characterized in that: the upper end of described lever (6) adopts square pole (61), lower end is the round pressure pin (62) by hot forging forming, described adjustment arm housing (1) side is provided with vertical installing hole (7), the upper end of lever (6) is parallel with the shank side adjusting arm housing (1), the vertical installing hole (7) that lower end traverse is described, the lower end of lever (6) is provided with cylinder tooth bar (10), described cylinder tooth bar (10) is connected with the gear on worm screw (3).

2. lever according to claim 1 (6) formula automatic adjusting arm, it is characterised in that: described round pressure pin (62) and vertical installing hole (7) outer end are provided with dust-proof sheath (11).

3. lever automatic adjusting arm according to claim 2, it is characterised in that: described sheath (11) material is oil resistant sizing material.

4. lever automatic adjusting arm according to claim 1, it is characterized in that: described automatic adjusting arm also includes an oil nozzle (14), described adjustment arm housing (1) worm gear place is provided with the groove (15) for installing oil nozzle (14), and described oil nozzle logical (14) is crossed screw thread rotation and connected in built-in groove (15).

5. lever automatic adjusting arm according to claim 1, it is characterized in that: described big bearing pin (8), small clevis pin with head (9) are equipped with axis hole (12) through the end, one end adjusting shift fork (5), and described axis hole (12) is provided with the pin (13) for blocking big bearing pin (8), small clevis pin with head (9) skids off.

6. lever according to claim 5 (6) formula automatic adjusting arm, it is characterized in that: described pin (13) includes spring (132) and is fixed on the block (131) at spring (132) two ends, described spring (132) is arranged in axis hole (12), described block (131) can slide on the opening part of axis hole (12), and described pin (13) and axis hole (12) are coaxially disposed.