CN204821528U - Fixed spring formula car brake master cylinder - Google Patents

Abstract

The utility model discloses a fixed spring formula car brake master cylinder, including cylinder body, a piston assembly, a return spring, the 2nd return spring and the 2nd piston assembly, a piston assembly including be used for to the locating lever of return spring location with be used for the spring holder to the 2nd return spring location, locating lever and spring holder are the frustum of a cone structure that appears, the inside of cylinder body is equipped with inserts among the return spring the just location boss relative with the locating lever. The utility model discloses a locating lever and the spring holder of fixed spring formula car brake master cylinder through setting up frustum shape structure has guaranteed that the return spring position is correct, insert the location boss among the return spring through setting up simultaneously in the cylinder body, avoid a return spring to appear shifting, guaranteed that a return spring's position is correct, but also improved the guidance quality ability to a return spring, guarantee that a return spring's axial force is more excellent.

Description

Fixing spring formula automobile brake master cylinder

Technical field

The utility model belongs to brake system of car technical field, and specifically, the utility model relates to a kind of fixing spring formula automobile brake master cylinder.

Background technology

Automobile brake master cylinder is very important assembly parts in brake system of car, is the main guarantee of vehicle safety travel.Pull back spring be wherein in automobile brake master cylinder one play braking return and to ease up the power actuated part of punching, its fixing situation will directly affect the stable performance of automobile brake master cylinder braking effect, in general automobile brake master cylinder, pull back spring is not fixed at end, this position spring on the go position in Motor Vehicle Braking Procedure is often offset, this situation not only causes pull back spring work efficiency drop, also can cause pull back spring unbalance stress, vehicle brake efficacy is declined.

Utility model content

The utility model provides a kind of fixing spring formula automobile brake master cylinder, and object guarantees that pull back spring position is accurate.

To achieve these goals, the technical scheme that the utility model is taked is: fixing spring formula automobile brake master cylinder, comprise cylinder body, first piston assembly, be positioned at the first pull back spring of first piston assembly side, the second pull back spring being positioned at first piston assembly opposite side and the second piston component be connected with first piston assembly by pipe link, second pull back spring is between first piston assembly and the second piston component, described first piston assembly comprises for the radius stay to described first pull back spring location with for the spring perch to described second pull back spring location, radius stay and spring perch are truncated cone structure, the inside of described cylinder body is provided with positioning boss in insertion first pull back spring and relative with radius stay.

Described radius stay and described spring perch lay respectively at one end of described first piston assembly.

Described positioning boss is cylindrical.

Fixing spring formula automobile brake master cylinder of the present utility model, by first piston assembly is used for pull back spring location radius stay and spring perch be arranged to truncated cone structure, such one side is guaranteed to reduce frictional loss because contact surface reduces in two pull back spring return processes, pull back spring automatically can navigate to conical base under the conical surface guides on the other hand, thus ensure that pull back spring correct position; Simultaneously, by arranging the positioning boss in insertion first pull back spring in cylinder body, avoiding the first pull back spring to occur displacement, ensure that the correct position of the first pull back spring, but also the steering capability that improve the first pull back spring, guarantee that the axial force of the first pull back spring is more excellent.

Accompanying drawing explanation

This specification sheets comprises the following drawings, shown content respectively:

Fig. 1 is the cutaway view of the utility model automobile brake master cylinder;

Fig. 2 is the structural representation of first piston assembly;

Fig. 3 is the structural representation of the second piston component;

Fig. 4 is the enlarged drawing of leather cup and backup block contact position;

Be labeled as in figure:

1, cylinder body; 2, the first pull back spring; 3, hydraulic fluid port seal ring; 4, lubricating cup assembly;

5, first piston assembly; 51, first piston bar; 52, the first radius stay; 53, the first spring perch; 54, the second spring perch; 55, the first orienting lug; 56, the second orienting lug; 57, the first leather cup; 58, the second leather cup; 59, fixed block; 510, the first backup block; 511, the second backup block;

6, the second pull back spring; 7, pipe link; 8, the second piston component; 81, the second piston rod; 82, the 3rd orienting lug; 83, the 3rd backup block; 84, the 3rd leather cup; 85, the 4th orienting lug; 86, the 3rd spring perch; 87, the 4th leather cup; 9, circlip for bore; 10, positioning boss.

Detailed description of the invention

Contrast accompanying drawing below, by the description to embodiment, be described in further detail detailed description of the invention of the present utility model, object helps those skilled in the art to have more complete, accurate and deep understanding to design of the present utility model, technical scheme, and contribute to its enforcement.

As shown in Figure 1 to Figure 3, the utility model provides a kind of fixing spring formula automobile brake master cylinder, comprise cylinder body 1, lubricating cup assembly 4, first piston assembly 5, the first pull back spring 2 being positioned at first piston assembly 5 side, the second pull back spring 6 being positioned at first piston assembly 5 opposite side and the second piston component 8, second pull back spring 6 of being connected with first piston assembly 5 by pipe link 7 between first piston assembly 5 and the second piston component 8.

Specifically, as shown in Figure 1, install copper oil nozzle on the upside of the cylinder body 1 of this master cylinder in pressure oil port, two lubricating cup hydraulic fluid ports on the right of pressure oil port install hydraulic fluid port seal ring 3 and lubricating cup assembly 4.The inner chamber that setting extends along its length in cylinder body 1, inner chamber also forms opening in cylinder body 1 one end, and cylinder body 1 other end is closed.In the inner chamber of cylinder body 1, the first pull back spring 2, first piston assembly 5, second pull back spring 6 and the second piston component 8 is set gradually from closed end to open end, second piston component 8 part is inserted in inner chamber and is connected with first piston assembly 5, and another part stretches out in outside cylinder body 1.In the madial wall of cylinder body 1, be provided with one insert positioning boss 10 in the first pull back spring 2 and relative with first piston assembly 5, positioning boss 10 one end to the first pull back spring 2 positions, the other end of first piston assembly 5 to the first pull back spring 2 positions, and ensure that the correct position of the first pull back spring 2.Positioning boss 10 is also cylindrical structural, and the axis of its axis and cylinder body 1 inner chamber is in same straight line.

As depicted in figs. 1 and 2, first piston assembly 5 comprises first piston bar 51, the first orienting lug 55 be fixedly connected with first piston bar 51 one end, the second orienting lug 56 be fixedly connected with the piston rod other end, the first backup block 510 be fixedly connected with the first orienting lug 55, the second backup block 511 be fixedly connected with the second orienting lug 56, the fixed block 59 be fixedly connected with the second backup block 511, be sheathed on the first leather cup 57 on the first backup block 510, be sheathed on the second leather cup 58 on the second backup block 511, be fixedly connected with the first backup block 510 and the first radius stay 52 for locating the first pull back spring 2, be sheathed on the first spring perch 53 on the first radius stay 52 and be fixedly connected with fixed block 59 and the second spring perch 54 for locating the second pull back spring 6.First piston bar 51, first orienting lug 55, second orienting lug 56, first backup block 510, second backup block 511 and fixed block 59 are cylindrical structural, and be coaxial connection between adjacent two parts, the first radius stay 52 and the second spring perch 54 are truncated cone structure.First radius stay 52 has bigger diameter end and miner diameter end, and the bigger diameter end of the first radius stay 52 is connected with the first backup block 510, and the bigger diameter end of the first radius stay 52 is less than the diameter of the first backup block 510.First spring perch 53 is sheathed on the first radius stay 52, and positioning boss 10 is entangled and the inwall of cylinder body 1 of conflicting in one end of the first pull back spring 2, and the other end is conflicted the first spring perch 53.First orienting lug 55 is identical with the diameter of the second orienting lug 56, and the first orienting lug 55 contacts with cylinder body 1 inner headed face with the periphery of the second orienting lug 56.The diameter of first piston bar 51 is less than the diameter of the first orienting lug 55 and the second orienting lug 56, and the second orienting lug 56 is between first piston bar 51 and the second backup block 511, and the second backup block 511 is between the second orienting lug 56 and fixed block 59.Second spring perch 54 is installed on the another side of fixed block 59, second spring perch 54 has bigger diameter end and miner diameter end, the bigger diameter end of the second spring perch 54 is connected with fixed block 59, and the bigger diameter end of the second spring perch 54 is less than the diameter of fixed block 59, the diameter of fixed block 59 is greater than the diameter of the second backup block 511.The miner diameter end of the second spring perch 54 is conflicted towards one end of the second piston component 8, second pull back spring 6 bigger diameter end of the second spring perch 54, and the other end is conflicted the 3rd spring perch 86 on the second piston component 8.

First piston assembly 5 and the second piston component 8 are in the inner chamber of cylinder body 1 completely, as shown in figures 1 and 3, second piston component 8 comprises coaxial the 3rd backup block 83, the 3rd orienting lug 82, second piston rod 81 and the 4th orienting lug 85 connected successively, the 3rd spring perch 86 also comprise the 3rd leather cup 84 be sheathed on the 3rd backup block 83, being sheathed on the 4th leather cup 87 on the 4th orienting lug 85 and being sheathed on pipe link 7.Second piston rod 81, the 3rd orienting lug 82, the 3rd backup block 83 and the 4th orienting lug 85 are cylindrical structural, 3rd orienting lug 82 is identical with the diameter of the 4th orienting lug 85, and largest diameter, the diameter of the second piston rod 81 takes second place, and the diameter of the 3rd backup block 83 is minimum.The periphery of the 4th orienting lug 85 is provided with the annular groove of accommodation the 4th leather cup 87.

As shown in Figure 1, be provided with in the open end of cylinder body 1 for carrying out spacing circlip for bore 9 to the second piston component 8, circlip for bore 9 is positioned at the outside of the second piston component 8.

As shown in Figure 4, as preferably, first backup block 510 of first piston assembly 5 contacts with the inner headed face of the first leather cup 57 with the second leather cup 58 respectively with the periphery of the second backup block 511, the periphery of the first backup block 510 and the second backup block 511 is provided with the annular groove extended along whole circumference, and annular groove can arrange vertically multiple.Equally, the periphery of the 3rd backup block 83 of the second piston component 8 contacts with the inner headed face of the 3rd leather cup 84, the periphery of the 3rd backup block 83 is provided with the annular groove extended along whole circumference, and annular groove can arrange vertically multiple.Such setting can make the contact of backup block and leather cup become linear contact lay, reduces area of contact, improves lubrication, extends product service life.

Below by reference to the accompanying drawings the utility model is exemplarily described.Obviously, the utility model specific implementation is not subject to the restrictions described above.As long as have employed the improvement of the various unsubstantialities that method of the present utility model is conceived and technical scheme is carried out; Or without improvement, above-mentioned design of the present utility model and technical scheme directly applied to other occasion, all within protection domain of the present utility model.

Claims (3)

1. fixing spring formula automobile brake master cylinder, comprise cylinder body, first piston assembly, be positioned at the first pull back spring of first piston assembly side, the second pull back spring being positioned at first piston assembly opposite side and the second piston component be connected with first piston assembly by pipe link, second pull back spring is between first piston assembly and the second piston component, it is characterized in that: described first piston assembly comprises for the radius stay to described first pull back spring location with for the spring perch to described second pull back spring location, radius stay and spring perch are truncated cone structure, the inside of described cylinder body is provided with positioning boss in insertion first pull back spring and relative with radius stay.

2. fixing spring formula automobile brake master cylinder according to claim 1, is characterized in that, described radius stay and described spring perch lay respectively at one end of described first piston assembly.

3. fixing spring formula automobile brake master cylinder according to claim 1 and 2, is characterized in that, described positioning boss is cylindrical.