CN102146972B

CN102146972B - Automatic clearance adjusting hydraulic braking front partial pump with temperature compensation function

Info

Publication number: CN102146972B
Application number: CN2011100628553A
Authority: CN
Inventors: 杨孚俊; 余松青; 骆欢; 陈贵春; 彭波; 尹梦岑
Original assignee: HUNAN YUNDA MACHINERY MANUFACTURING Co Ltd
Current assignee: Hunan Yunda Electromechanical Science & Technology Co., Ltd.
Priority date: 2011-03-16
Filing date: 2011-03-16
Publication date: 2012-07-04
Anticipated expiration: 2031-03-16
Also published as: CN102146972A

Abstract

The invention discloses an automatic clearance adjusting hydraulic braking front partial pump with temperature compensation function, which comprises a partial pump shell, a piston, an adjusting screw, a fastening screw, a spring clamping sheet, a dustproof cover, a Y-shaped sealing ring, a bleed screw, an oil inlet and a sealing combination head, wherein the dustproof cover is arranged between the partial pump shell and the piston; the bottom of a cylinder hole of the partial pump shell is provided with the bleed screw and the oil inlet; the sealing combination head is arranged in the oil inlet; the fluted disc end of the piston is provided with an inner ring slot; an annular temperature compensation ring is arranged in the inner ring slot; and one end of the temperature compensation ring is contacted with the inner end face of the partial pump shell. The automatic clearance adjusting hydraulic braking front partial pump has the advantages of realizing automatic adjustment of a braking clearance, improving 'over adjustment' caused by continuous and frequent braking of a brake, reducing the working stroke of a pedal, reducing the response time of the brake, improving the sealing reliability and durability due to double sealing of the piston of the partial pump and improving the braking reliability and the driving safety.

Description

The preceding wheel cylinder of self-regulated gap hydraulic braking with temperature compensation function

[technical field] the present invention relates to auto parts machinery, relates to a kind of preceding wheel cylinder of self-regulated gap hydraulic braking with temperature compensation function particularly.

After long-time descending of [background technique] automobile hydraulic drum brake or the frequent continuously braking; The brake drum temperature raises; The drum internal diameter increases because of thermal expansion; And then produce " excessive gaps " that the thermal expansion by brake drum causes, and have from the break of conditioning function and will adjust brake clearance automatically, brake clearance is controlled within the scope of setting value.When excessive gap surpassed the gap width of setting, the adjustment amount of self-adjustment structure also just met or exceeded the gap setting value.When brake drum is cooled to the normal temperature state, can be because of brake clearance too small or do not have the gap and produce that break is dawdled or locking, produce " toning " phenomenon.For fear of the generation of toning, all obtained greatlyyer set gap width usually, can strengthen pedal travel and hysteresis braking response time like this, braking ability is had a negative impact, even can influence traffic safety.

Present brake cylinder only adopts y-type seal ring, and when braking system was not worked, pipeline inner pressure was lower; The y-type seal ring of wheel cylinder only is in slight open configuration, has slightly at y-type seal ring under the situation of wearing and tearing, the low pressure seepage possibly occur; Pollute the brake shoe friction surface, reduce braking force.

In order to address the above problem, the present invention provides a kind of preceding wheel cylinder of self-regulated temperature compensation function, double sealing structure gap hydraulic braking that has [summary of the invention].

This preceding wheel cylinder of self-regulated gap hydraulic braking with temperature compensation function; Comprise branch pump case, piston, adjusting screw rod, fastening screw trip bolt, spring card, dust-proof cover, y-type seal ring, bleed screw, filler opening and sealed junction syncephalon, be provided with dust-proof cover between branch pump case and the piston, the grooved head of adjusting screw rod is placed on the outside of piston; The adjusting screw rod the other end is installed in the screw of centre; The outer end of branch pump case is provided with straight trough, and bottom, branch pump case cylinder hole is provided with bleed screw and filler opening, is provided with the sealed junction syncephalon in the filler opening; It is characterized in that; The fluted disc end of piston is provided with inner groove, and circular temperature correction ring is installed in the inner groove, and an end of temperature correction ring contacts with the interior edge face of branch pump case.

Be equipped with on the branch pump case and ship and resell on another market, be with the adjustment lever on shipping and reselling on another market, shipping and reselling on another market and adjusting is provided with holddown spring between the lever; One end of adjustment lever passes through pin with the end of adjustment pull bar and flexibly connects near the ratchet dish of piston, and the adjustment pull bar is through kidney slot and the set screw flexible connection that is installed on the branch pump case, and the adjustment pull bar the other end is stuck in the groove of piston crown.

/ 3rd places are provided with groove apart from the piston inner end, are provided with the O RunddichtringO in the groove.

The temperature correction ring is installed between the interior edge face of fluted disc right side and branch pump case of piston; The axial dimension of temperature correction ring expands and increases after being heated; Piston is ejected a segment distance, make brake shoe open certain distance, thereby dwindle " excessive gaps " that the thermal expansion by brake drum forms; When this gap width that has dwindled during less than the setting value of self-adjustment structure; Self-adjustment structure does not adjust; The compensation rate of appropriate design temperature compensation mechanism; When later brake clearance of compensation " excessive gaps " during still greater than the normal clearance setting value of self-regulated clearance mechanism, the self-regulated clearance mechanism can be adjusted its gap as usual.When the brake drum cooling; When brake clearance dwindled, temperature correction ring also Yin Wendu descended and axial dimension dwindles, and piston is bounced back in brake cylinder under the effect of brake shoe return spring; Brake shoe is retraction and then; Gap between brake drum and the brake shoe is increased, thereby, just prevent the generation of " toning " phenomenon than avoiding brake drum to dawdle and the generation of locking phenomenon.

When excessive gaps appearred in gasket wear, the piston motion stroke strengthened, and through the adjustment pull bar adjustment lever was rotated, and produced the moving tooth motion during piston return, adjusting screw rod is protracted, thereby dwindle brake clearance.

Braking back wheel cylinder adopts the structure of double seal piston to have two functions, and the first is managed pressure when brakeless moves very low, and a small amount of seepage possibly appear in y-type seal ring, carries out secondary seal by the O RunddichtringO, has increased the reliability of leakage proof; It two is between the two seals circle, to form one section zone that has a small amount of brake fluid to exist, and being in when making y-type seal ring work has lubricated state, can not produce dry friction, greatly prolongs the working life of y-type seal ring, improves the reliability and the durability of sealing.

Advantage of the present invention: realized the automatic adjustment of brake clearance; Having improved break continuously, frequently brakes and forms " over control "; Reduced the pedal working stroke, reduced the break response time, the double seal of wheelcylinder piston; Improve the reliability and the durability of sealing, improved the reliability and the traffic safety of braking.

[description of drawings]

Fig. 1 is an internal structure schematic representation of the present invention

Fig. 2 is a plan view of the present invention

Fig. 3 is that the present invention adjusts pull bar and the schematic representation that is connected of adjusting lever

Fig. 4 is the A-A sectional view of Fig. 2

Among the figure: 1, adjusting screw rod, 2, the adjustment pull bar, 3, piston, 4, the temperature correction ring, 5, holddown spring; 6, dust-proof cover, 7, the adjustment lever, 8, ship and resell on another market, 9, the O RunddichtringO, 10, y-type seal ring; 11, divide pump case, 12, pin, 13, set screw, 14, bleed screw, 15, filler opening; 16, sealed junction syncephalon, 17, straight trough, 18, inner groove, 19, groove.

[embodiment] is following to explanation of the present invention below in conjunction with accompanying drawing:

In Fig. 1, Fig. 2, Fig. 3 and Fig. 4, be provided with dust-proof cover 6 between branch pump case 11 and the piston 3, the grooved head of adjusting screw rod 1 is placed on the outside of piston 3; Adjusting screw rod 1 the other end is installed in the screw at piston 3 centers; The outer end of branch pump case 11 is provided with straight trough 17, and branch pump case 11 cylinder base are provided with bleed screw 14 and filler opening 15, are provided with sealed junction syncephalon 16 in the filler opening 15; The fluted disc end of piston 3 is provided with inner groove 18; Circular temperature correction ring 4 is installed in the inner groove 18, and temperature correction ring 4 is that the manganese powder with 20-25%, the iron powder of 60-65%, the titanium valve of 5-10% and the silica flour of 5-10% are processed, and its optimum proportioning is a manganese powder 20%; Iron powder 60%, titanium valve 10% and silica flour 10%, an end of temperature correction ring 4 contacts with the interior edge face of branch pump case 11.

Be equipped with on the branch pump case 11 and ship and resell on another market 8, shipping and reselling on another market is with adjustment lever 7 on 8, ships and resell on another market 8 to be provided with holddown spring 5 with adjusting between the lever 7; One end of adjustment lever 7 is near the ratchet dish of piston 3; Flexibly connect through pin 12 with the end of adjustment pull bar 2; Adjustment pull bar 2 flexibly connects through kidney slot and the set screw 13 that is installed on the branch pump case 11, and adjustment pull bar 2 the other ends are stuck in the groove of piston 3 heads.

Be provided with y-type seal ring 10 in the piston 3,1/3rd places are provided with groove 19 apart from piston 3 inner ends, are provided with O RunddichtringO 9 in the groove 19.

Claims

1. the preceding wheel cylinder of self-regulated gap hydraulic braking that has temperature compensation function; Comprise branch pump case, piston, adjusting screw rod, fastening screw trip bolt, spring card, dust-proof cover, y-type seal ring, bleed screw, filler opening and sealed junction syncephalon, be provided with dust-proof cover between branch pump case and the piston, the grooved head of adjusting screw rod is placed on the outside of piston; The adjusting screw rod the other end is installed in the screw of centre; The outer end of branch pump case is provided with straight trough, and the wheel cylinder housing bottom is provided with bleed screw and filler opening, is provided with the sealed junction syncephalon in the filler opening; It is characterized in that; The ratchet dish end of piston is provided with inner groove, and the temperature correction ring is installed in the inner groove, and an end of temperature correction ring contacts with the interior edge face of branch pump case.

2. the preceding wheel cylinder of self-regulated gap hydraulic braking with temperature compensation function according to claim 1 is characterized in that, is equipped with on the branch pump case and ships and resell on another market, and is with the adjustment lever on shipping and reselling on another market, and shipping and reselling on another market and adjusting is provided with holddown spring between the lever; One end of adjustment lever is near the ratchet dish of piston; The other end of adjustment lever flexibly connects through pin with the end of adjustment pull bar; The adjustment pull bar flexibly connects through kidney slot and the fastening screw trip bolt that is installed on the branch pump case, and the adjustment pull bar the other end is stuck in the groove of piston crown.

3. the preceding wheel cylinder of self-regulated gap hydraulic braking with temperature compensation function according to claim 1 is characterized in that 1/3rd places are provided with groove apart from the piston inner end, is provided with the O RunddichtringO in the groove.