CN2440970Y

CN2440970Y - Automatic brake gap regulator

Info

Publication number: CN2440970Y
Application number: CN 00246030
Authority: CN
Inventors: 朱清峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-08-07
Filing date: 2000-08-07
Publication date: 2001-08-01
Anticipated expiration: 2010-08-07

Abstract

The utility model provides an automatic brake gap regulator, wherein, a single-stage one-way clutch is arranged in the automatic brake gap regulator. The single-stage one-way clutch comprises a clutch gearwheel, a clutch sleeve, a clutch spring, and a stop spring. The clutch sleeve can be sheathed on a worm shaft in a sliding way. One end of the clutch sleeve is abutted on the end face of the clutch gearwheel, and the other end of the clutch sleeve is extended out of a shell. The clutch sleeve is fixed with the worm shaft through a pin on the end. The one-way clutch, a worm, and the worm shaft are arranged in an inner cavity body. The worm is meshed with a worm wheel installed on a cam shaft. The clutch gearwheel is installed on the worm shaft. A toothed part on one end of a toothed rack is meshed with the clutch gearwheel, and the other end of the toothed rack is provided with a finger claw part cooperated with a flute in a control ring.

Description

Clearance automatic adjustment device

The utility model has related to a kind of clearance automatic adjustment device, particularly a kind of clearance automatic adjustment device that is installed on the vehicle S-cam break, can oppositely regulates brake clearance.

In the prior art, the S-cam break of automobile is to come automobile is implemented braking by brake lining and the friction between the brake drum that is installed on the brake shoe.It requires, and brake lining should be able to be pressed against on the brake drum rapidly when braking.And when driving, permit having card, armful phenomenon to take place anything but.Therefore, a reasonable clearance should be set between brake lining and brake drum.Cause the wearing and tearing of brake lining by friction, this brake clearance is increased gradually, make the corresponding growth of piston stroke of braking locellus simultaneously., certainly will influence the corresponding time of braking if but excessive crack can not get regulating timely.On the contrary, when the break expanded by heating, brake clearance reduces, will certainly produce block, the phenomenon of locking.Thereby be directly connected to the driving safety of vehicle.Just because of this, all vehicle braked devices all need to be provided with the brake clearance controlling device.

Chinese patent ZL96241604.5 discloses clearance automatic adjustment device, this device can be regulated the gap effectively automatically, but it does not have reverse regulatory function, promptly can not rotate counterclockwise worm-wheel shaft, when the situation of replacing brake block is turned, reached to break expanded by heating brake clearance automatically down, must remove the adjustment arm from camshaft and reinstall, just can reach the brake clearance of automobile, this brings many troubles just for driver and motor vehicle repair personnel.

The purpose of this utility model provides a kind of improved clearance automatic adjustment device, compare with like product of the prior art, it has increased reverse adjustment function, promptly turn, can rotate counterclockwise when reaching the situation of changing brake block worm shaft automatically down and make brake clearance become big, thereby reach its normal clearance when break expanded by heating brake clearance.

In order to realize the purpose of this utility model, a kind of clearance automatic adjustment device is provided, it is installed on the vehicle S-cam break, this device comprises the housing of sealing, wherein be provided with the single-stage overrunning clutch, described single-stage overrunning clutch comprises the clutch gear that is sleeved on the worm shaft, clutch cover, clutch spring and stopper spring, wherein stopper spring is sleeved in the clutch spring, the clutch spring housing is contained in the annular wall of clutch gear and clutch cover, one end of described stopper spring is against the end wall inboard of clutch cover, the other end of described stopper spring is against the shaft shoulder of worm shaft, one end of clutch spring is against the end wall inboard of clutch cover, the other end of described clutch spring is against the end wall inboard of clutch gear, axial direction along worm shaft, clutch cover is positioned at the outside of clutch gear, with overrunning clutch, worm screw and worm shaft are arranged in the inner chamber body, worm screw and the worm gear that is installed on the camshaft are meshed, in the course of the work, overrunning clutch and worm shaft are in coupled condition always, clutch gear is installed on the worm shaft, rack support is on housing, the band toothed portion of tooth bar one end is meshed with clutch gear, the other end of tooth bar is provided with the paw part, described paw part matches with groove in the control ring that fixedly installs with respect to housing, wherein said clutch cover is sleeved on the worm shaft slidably, one end is against the end face of clutch gear, the other end stretches out the outside of housing, and in this end, described clutch cover is fixed by pin and worm shaft.

Clearance automatic adjustment device of the present utility model, an end of wherein said pin is fixed by cotter pin.

Clearance automatic adjustment device of the present utility model, wherein also comprise and be sleeved on pot axle sleeve of bar axle one end, in the hole in the described axle sleeve insertion overrunning clutch inner chamber, the other end at worm shaft is provided with annular plug screw, be provided with packing ring between the bore area of described annular plug screw and the corresponding clutch cover shaft shoulder, along the axial direction of worm shaft, between worm screw and clutch gear, be provided with supporting sleeve.

The structure of the clearance automatic adjustment device that the utility model provides is compared with the disclosed clearance automatic adjustment device of Chinese patent ZL96241604.5 with service behaviour, increased reverse adjustment structure, make dismounting convenient, adjustment is more prone to, and has reduced the cost of brake arm simultaneously.

The contrast accompanying drawing is described embodiment of the present utility model in detail below.

Fig. 1 is the structural representation of Chinese patent ZL96241604.5 clearance automatic adjustment device, and wherein the part is analysed and observe, and this moment, this device was in non-braking position.

Fig. 2 is the partial sectional view of Chinese patent ZL96241604.5 clearance automatic adjustment device, and is wherein clear in order to describe, the control ring 1 of having dismantled.

Fig. 3 is the partial sectional view of the clearance automatic adjustment device that has reverse adjustment structure that the utility model proposes.

For convenience's sake, the part that the utility model is identical with Chinese patent ZL96241604.5 has all used same label.

In Fig. 1, described the clearance automatic adjustment device that Chinese patent ZL96241604.5 proposes, the unitary construction of this device is identical with unitary construction of the present utility model.This device is installed on the automobile S-cam break of the prior art, wherein with worm gear 11 coaxial being installed on the S-cam camshaft of brakes B, because automobile S-cam break belongs to prior art, so not expression in the accompanying drawings.

Can see that from Fig. 1 and Fig. 2 this device comprises the housing 13 of sealing.In housing 13, be provided with single-stage overrunning clutch 15.This single-stage overrunning clutch 15 comprises clutch gear 3, clutch cover 5, clutch spring 4 and the stopper spring 6 that is sleeved on the worm shaft 8.Stopper spring 6 coaxial packages are in clutch spring 4.Clutch spring 4 coaxial packages are in the annular wall of clutch gear 3 and clutch cover 5.One end of stopper spring 6 is against the shaft shoulder of worm shaft 8, and the other end of stopper spring 6 is against the end wall inboard of clutch cover 5.Thereby can prevent clutch cover 5 because Vehicular vibration produces malfunction.One end of clutch spring 4 is against the end wall inboard of clutch cover 5.The other end of described clutch spring 4 is against the end wall inboard of clutch gear 3.Along the axial direction of worm shaft 8, clutch cover 5 is positioned at the outside of clutch gear 3.Clutch gear 3 is sleeved on the worm shaft 8, and clutch cover 5 is sleeved on the worm shaft 8 by rectangular spline 19.Single-stage overrunning clutch 15, worm screw 12 and worm shaft 8 are arranged in the inner chamber body 20.Worm screw 12 and the worm gear 11 that is installed on the camshaft A are meshed.In the course of the work, single-stage overrunning clutch 15 is in coupled condition with worm shaft 8 always.In the inner chamber 20 of housing 13 worm shaft 8 is housed, one end coaxial package axle sleeve 14.In the hole 16 in the described axle sleeve 14 insertion single-stage overrunning clutch inner chambers 20.Along the axial direction of worm shaft 8, between worm screw 12 and clutch gear 3, be provided with supporting sleeve 17, it is positioned at the medium position of worm shaft 8.

In Fig. 1, tooth bar 2 is supported on the housing 13.One end of tooth bar 2 is provided with toothed portion 21, and this toothed portion 21 is meshed with clutch gear 3.The other end of tooth bar 2 is provided with paw part 22, and this paw part 22 matches with groove 24 in the control ring 1 that fixedly installs with respect to housing 13.This control ring 1 is fixedly mounted on the not shown vehicle frame.The paw part 22 of one end of tooth bar 2 stretches in the groove 24 in the control ring 1.The described paw 22 upper edge face and the face position, lower edge of the groove in control ring 1 24 respectively touches the location.

As seen from Figure 3: different are the automatic backlash automatic control tegulatingdevice that the utility model and Chinese patent ZL96241604.5 propose: described clutch cover 5 is sleeved on the worm shaft 8 slidably, its end is against the end face of clutch gear 3, the other end stretches out the outside of housing 13, in this end, described clutch cover 5 is fixing with worm shaft 8 by pin 25, one end of pin is fixed by cotter pin 26, is provided with annular plug screw 10 on the shaft shoulder of clutch cover 5.Between the shaft shoulder of the bore area of described annular plug screw 10 and corresponding clutch cover 5, be provided with the plastic-metal composite gasket 7 of thrust-bearing effect.

This shows, compare with the clearance automatic adjustment device that Chinese patent ZL96241604.5 proposes, clearance automatic adjustment device of the present utility model has saved spline 19 that wherein said clutch cover 5 links to each other with worm shaft 8 and at the bore area of described annular plug screw 10 and the Sealing 9 that is provided with between the axle journal of worm shaft 8 accordingly.When break expanded by heating gap occurring and turn down automatically, or when changing brake block and need redefine brake clearance, can remove cotter pin 26 and pin 25 easily, rotate counterclockwise worm shaft 8, reach rational gap after, corresponding again rotation clutch cover 5, and then pin 25 and cotter pin 26 plugged, so just needn't disassemble whole brake arm again and reinstall, save driver and maintenance man's time, increase benefit.

Claims

1. clearance automatic adjustment device, it is installed on the vehicle S-cam break, this device comprises the housing (13) of sealing, wherein be provided with single-stage overrunning clutch (15), described single-stage overrunning clutch (15) comprises the clutch gear (3) that is sleeved on the worm shaft (8), clutch cover (5), clutch spring (4) and stopper spring (6), wherein stopper spring (6) is sleeved in the clutch spring (4), clutch spring (4) is sleeved in the annular wall of clutch gear (3) and clutch cover (5), one end of described stopper spring (6) is against the end wall inboard of clutch cover (5), the other end of described stopper spring (6) is against the shaft shoulder of worm shaft (8), one end of clutch spring (4) is against the end wall inboard of clutch cover (5), the other end of described clutch spring (4) is against the end wall inboard of clutch gear (3), axial direction along worm shaft (8), clutch cover (5) is positioned at the outside of clutch gear (3), with overrunning clutch (15), worm screw (12) and worm shaft (8) are arranged in the inner chamber body (20), worm screw (12) and the worm gear (11) that is installed on the camshaft (0) are meshed, in the course of the work, overrunning clutch (15) is in coupled condition with worm shaft (8) always, clutch gear (3) is installed on the worm shaft (8), tooth bar (2) is supported on the housing (13), the band toothed portion (21) of tooth bar (2) one ends is meshed with clutch gear (3), the other end of tooth bar (2) is provided with paw part (22), described paw part (22) matches with groove (24) in the control ring (1) that fixedly installs with respect to housing (13), it is characterized in that: described clutch cover (5) is sleeved on the worm shaft (8) slidably, its end is against the end face of clutch gear (3), the other end stretches out the outside of housing (13), in this end, described clutch cover (5) is fixing by pin (25) and worm shaft (8).

2. by the described clearance automatic adjustment device of claim 1, it is characterized in that: an end of described pin is fixed by cotter pin (26).

3. by the described clearance automatic adjustment device of claim 1, it is characterized in that: also comprise the axle sleeve (14) that is sleeved on worm shaft (8) one ends, in the hole (16) in described axle sleeve (14) the insertion overrunning clutch inner chamber (20), the other end at worm shaft (8) is provided with annular plug screw (10), be provided with packing ring (7) between the bore area of described annular plug screw (10) and corresponding clutch cover (5) shaft shoulder, along the axial direction of worm shaft (8), between worm screw (12) and clutch gear (3), be provided with supporting sleeve (17).