CN202756498U

CN202756498U - Braking force increasing mechanism for wet type automobile brake

Info

Publication number: CN202756498U
Application number: CN 201220446755
Authority: CN
Inventors: 张金生; 彭志成
Original assignee: XIANGYANG BILE HYDRAULIC MACHINERY Co Ltd
Current assignee: XIANGYANG BILE HYDRAULIC MACHINERY Co Ltd
Priority date: 2012-09-04
Filing date: 2012-09-04
Publication date: 2013-02-27
Anticipated expiration: 2022-09-04

Abstract

A braking force increasing mechanism for a wet type automobile brake relates to the field of automobile brake manufacture. A boosting piston and a spring are put in a cylinder body, and one end of the spring is provided with a spring adjusting plug. A large end face of a force increasing piston and a front end of the boosting piston are arranged in the cylinder body oppositely, an oil inlet connector is arranged on the cylinder body between the boosting piston and the force increasing piston, and hydraulic oil is injected between the two pistons. A retaining ring is arranged between an outer edge face of a small end of the force increasing piston and the cylinder body, a braking friction plate is pressed on a small end face of the force increasing piston through an end cover body, a rotary casing is arranged on a shaft through a bearing, an oil inlet connector is arranged between the force increasing piston and the retaining ring, and an oil cavity is formed between the force increasing piston and the retaining ring. The braking force increasing mechanism effectively achieves increasing of spring thrust, has the advantages of being small in size, light in weight, stable in braking force, high in reliability and the like, and can be widely applied to the normally closed wet automobile brake and the like.

Description

Wet type Brake for vehicle braking force enlarging mechanism

Technical field

The utility model relates to field of automobile, specifically the enlarging mechanism of a kind of wet type Brake for vehicle braking force (spring force).

Background technique

At present, the normally closed wet type Brake for vehicle of wheel end generally adopts machinery (spring force) to produce braking force, and owing to being subjected to the restriction of wheel hub intracavity space size, the space that is used for mounting spring in the break is very limited, can't the large diameter spring of design and installation, so that the braking torque of wet type Brake for vehicle is restricted under this spatial condition, cause that to manufacture and design the normally closed wet type Brake for vehicle of high pulling torque very difficult, can not promote the use of heavy goods vehicles or big machinery field.

Summary of the invention

For overcoming the deficiencies in the prior art, goal of the invention of the present utility model is to provide a kind of wet type Brake for vehicle braking force enlarging mechanism, utilization is with under the pressure, the principle that the thrust that piston produces is directly proportional with its active area is with the purpose that realizes that spring thrust effectively increases in fixed space.

For achieving the above object, an end band of the utility model annular propelling piston is useful on the hole of mounting spring, and propelling piston and spring are packed in the cylinder body in the lump, and an end of spring is provided with the spring adjusting plug; The large end face area is that propelling piston front-end face area n reinforcement piston doubly is ladder-type structure, the large end face of reinforcement piston is relative with the front end of propelling piston to be installed in the cylinder body, on the cylinder body, be provided with the oil-feed interface between propelling piston and the reinforcement piston, between two-piston, fill with hydraulic oil; Back-up ring is contained between the small end outer edge surface and cylinder body of reinforcement piston, brake strip is pressed on the small end face of reinforcement piston with end cover body, roll-shell is contained on the axle by bearing, is provided with the oil-feed interface between reinforcement piston and the back-up ring, forms oil pocket between reinforcement piston and back-up ring; Be provided with seal ring between propelling piston, reinforcement piston respectively and between the cylinder body, back-up ring and cylinder body and the reinforcement piston.

The utility model compared with prior art by design Hydraulic Double piston in cylinder body, is used the principle that thrust that piston produces is directly proportional with its active area, utilize the size variation of two-piston end area, realized the increase of spring thrust, solved the space little, the problem of spring thrust deficiency, created condition for making the normally closed wet type Brake for vehicle of high pulling torque, and, under the condition of identical braking torque, it is little that break has a volume, lightweight, braking force is stable, high reliability.Can be widely used in general-utility car, wheeled engineering truck, farm machinery and vehicle, adapt to especially the normally closed wet type Brake for vehicle that the heavy goods vehicles such as explosion-proof, fire prevention, the environmental pollution requirement is high, service condition is harsh engineering vehicle or big machinery field are used.

Description of drawings

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

Embodiment

As shown in Figure 1, propelling piston 3 of the present utility model is annular, evenly on the end face thereafter all processes porosely, is used for mounting spring 2, and propelling piston 3 is in spring 2 is installed on indent grooved cylinder body 1, and an end of spring 2 is provided with spring adjusting plug 9; Reinforcement piston 4 is ladder-type structure, the n of the front-end face area that its large end face area is propelling piston 3 doubly, the diameter of bore of diameter of bore and propelling piston 3 is measure-alike, relative being installed in the cylinder body 1 of front end of the large end face of reinforcement piston 4 and propelling piston 3, on the cylinder body 1, be provided with the oil-feed interface between propelling piston 3 and the reinforcement piston 4, between two-piston, fill with hydraulic oil; Back-up ring 5 is installed on the oral area of cylinder body 1, be contained between the small end outer edge surface and cylinder body 1 of reinforcement piston 4, be used for the cylinder body that sealing is comprised of cylinder body 1, propelling piston 3, reinforcement piston 4, brake strip 7 usefulness end cover bodies 6 are pressed on the small end face of reinforcement piston 4, roll-shell 8 is contained on the axle by bearing, be provided with the oil-feed interface between reinforcement piston 4 and the back-up ring 5, between reinforcement piston 4 and back-up ring 5, form oil pocket; Be provided with seal ring between propelling piston 3, reinforcement piston 4 respectively and between the housing 1, back-up ring 5 and housing 1 and the reinforcement piston 4.

The running of this boosting mechanism is: the pressing brake strip: the end area of supposing propelling piston 3 is s, in the break manufacturing, adjust first required spring force f, spring force f promotes propelling piston 3 and is moved to the left, in the left end oil pocket of propelling piston 3, produce f/s pressure, under the effect of this pressure, the large end face ns of reinforcement piston 4 produces the thrust of nf, promotes reinforcement piston 4 and is moved to the left pressing brake strip 7, has realized that the n of spring force doubly increases; Brake off: oiling in the oil pocket between back-up ring 5 and the reinforcement piston 4, promote reinforcement piston 4 and move right, corresponding promotion propelling piston 3 Compress Spring 2 that moves to right is realized absent-mindedness brake strip 7.

Claims

1. wet type Brake for vehicle braking force enlarging mechanism, it is characterized in that: an end band of annular propelling piston (3) is useful on the hole of mounting spring (2), propelling piston (3) and spring (2) are packed in the cylinder body (1) in the lump, and an end of spring (2) is provided with spring adjusting plug (9); The large end face area is that propelling piston (3) front-end face area n reinforcement piston (4) doubly is ladder-type structure, relative being installed in the cylinder body (1) of front end of the large end face of reinforcement piston (4) and propelling piston (3), be provided with the oil-feed interface between, propelling piston (3) upper at cylinder body (1) and the reinforcement piston (4), between two-piston, fill with hydraulic oil; Back-up ring (5) is contained between the small end outer edge surface and cylinder body (1) of reinforcement piston (4), brake strip (7) is pressed on the small end face of reinforcement piston (4) with end cover body (6), roll-shell (8) is contained on the axle by bearing, be provided with the oil-feed interface between reinforcement piston (4) and the back-up ring (5), between reinforcement piston (4) and back-up ring (5), form oil pocket.

2. wet type Brake for vehicle braking force enlarging mechanism according to claim 1 is characterized in that: be provided with seal ring between propelling piston (3), reinforcement piston (4) respectively and between the cylinder body (1), back-up ring (5) and cylinder body (1) and the reinforcement piston (4).