CN209762073U

CN209762073U - drum brake with spring ejector rod mechanism

Info

Publication number: CN209762073U
Application number: CN201920500513.7U
Authority: CN
Inventors: 乔冠朋; 徐宇; 陈圣; 朱骏
Original assignee: Jingjiang Hengda Auto Parts Manufacturing Co Ltd
Current assignee: Jingjiang Hengda Auto Parts Manufacturing Co Ltd
Priority date: 2019-04-12
Filing date: 2019-04-12
Publication date: 2019-12-10
Anticipated expiration: 2029-04-12

Abstract

the utility model relates to a drum brake with spring ejector pin mechanism, including wheel hub, the wheel hub medial surface is provided with upper and lower shoes, installs return spring and brake unit between two shoes, and brake unit includes hydraulic pressure wheel cylinder, and hydraulic pressure wheel cylinder top installs self-modulation dial plate through clamp bolt, and the tip is installed screw rod and plate that are connected with its piston, installs the ratchet rather than the cooperation motion on the screw rod, and self-modulation dial plate's one end and plate joint, the other end contacts with the tooth of ratchet, still includes self-modulation extension spring; the outer side of the hub is provided with a spring seat, the spring seat penetrates through the hub, the end part of the spring seat is provided with a push rod, the spring seat is sleeved with an adjusting spring, and the push rod is positioned below the end part of the self-adjusting shifting plate. The utility model discloses a thereby exert external force and make ejector pin jack-up self-modulation dial plate break away from the ratchet, and then realize reaching the purpose in back adjustment braking clearance to the anti-accent of ratchet, the mechanism is simple exquisite, convenient and practical.

Description

Drum brake with spring ejector rod mechanism

Technical Field

the utility model belongs to the technical field of the drum brake technique and specifically relates to a drum brake with spring ejector pin mechanism.

Background

With the development of new energy vehicle models, hydraulic drum brakes are favored again in the market, and according to the requirements of national regulations, the hydraulic brakes with the function of automatically adjusting the clearance gradually replace the common hydraulic brakes. The brake with the self-adjusting mechanism can realize automatic compensation of the brake clearance between the shoe and the hub when a brake lining is worn so as to ensure that the clearance is maintained in an optimal range and is not increased along with the wear of the lining, thereby providing great guarantee for the stability of the braking performance of a vehicle.

The hydraulic drum brake with the self-adjusting mechanism adopts the ratchet wheel with the unidirectional shifting teeth for avoiding the backlash in the use process, thereby ensuring that the mechanism automatically adjusts the gradually-increased backlash towards the small direction along with the abrasion of a lining and avoiding the phenomenon of the backlash in the opposite direction. Therefore, when the worn brake lining needs to be replaced or other clearance reverse adjustment is needed, the self-adjusting plate must be jacked up and separated from the ratchet wheel by a special component, and the reverse adjustment operation of the ratchet wheel can be carried out.

In the prior art, a special thimble or a built-in thimble is adopted to jack up the self-adjusting shifting plate, so that gap reverse adjustment is realized; because the brake unit is installed in the inboard of wheel hub, and wheel hub part is limited because of the structure restriction space, light is not enough, operating personnel stretches into thimble to inside and exert external force from the wheel hub outside and make it jack-up self-adjusting dial plate, all rely on the sense of hand to operate and exert force, there is very big degree of difficulty once realizing the jack-up of dial plate accurately, current structure and mode make installation and after-sale maintenance personal operate when anti-modulation moves the clearance extremely difficultly, waste time and energy, complain about constantly.

SUMMERY OF THE UTILITY MODEL

The applicant aims at the defects in the prior art and provides a drum brake with a spring ejector rod mechanism, which is reasonable in structure, so that the gap adjustment can be quickly and conveniently realized, the investment cost is low, the installation is quick, and the gap adjustment efficiency of operators is greatly improved.

The utility model discloses the technical scheme who adopts as follows:

The utility model provides a drum brake with spring ejector pin mechanism, includes wheel hub, and wheel hub medial surface longitudinal symmetry is provided with the last shoe and the shoe down of semicircle arcuation, goes up the shoe and installs two sets of return spring down between the shoe, is located go up the shoe and install the braking unit with the wheel hub of clearance department between the shoe down on the symmetry, single braking unit's structure is: the automatic adjusting device comprises a hydraulic wheel cylinder fixed on a wheel hub, wherein an automatic adjusting plate is rotatably arranged outside a cylinder body of the hydraulic wheel cylinder through a compression bolt, a screw rod and a plate which are connected with a piston of the hydraulic wheel cylinder are arranged at the end part of the hydraulic wheel cylinder, the plate is sleeved on the screw rod, a ratchet wheel which moves in a matched manner with the screw rod is arranged on the screw rod, one end of the automatic adjusting plate is clamped with the plate, the other end of the automatic adjusting plate is contacted with teeth on the periphery of the ratchet wheel, and an automatic adjusting tension spring;

The outer side surface of the hub is provided with a spring seat, the spring seat penetrates through the hub and is fixedly provided with a push rod at the end part of the hub, an adjusting spring is further sleeved on the spring seat positioned on the outer side surface of the hub, and the push rod is positioned below the end part of the self-adjusting shifting plate.

As a further improvement of the above technical solution:

the structure of the self-adjusting shifting plate is as follows: one end of the self-adjusting tension spring is provided with a round hole matched with the compression bolt, a clamping end extends towards the side edge, the outer side of the clamping end is provided with a first clamping opening, the inner side of the first clamping opening is provided with a second clamping opening, the first clamping opening is connected with the self-adjusting tension spring in a clamping mode, and the second clamping opening is connected with the plate in a clamping mode; the other end of the self-adjusting shifting plate extends to form a bent shifting end, and the end part of the shifting end is contacted with the teeth of the ratchet wheel; the middle part of the self-adjusting shifting plate extends outwards, a bulge formed by stamping is arranged at the extending end part, and the bottom of the bulge is concave inwards and is positioned above the ejector rod.

The structure of the plate is as follows: the self-adjusting device comprises a body connected with a piston of a hydraulic wheel cylinder, wherein a hole is formed in the body and is sleeved on a screw rod, the body extends towards the side edge, a third bayonet is formed in the end part of the body, and the third bayonet is clamped with the self-adjusting shifting plate; the body is also extended with a bent lug, and the lug is provided with a hole and is connected with the self-adjusting tension spring in a clamping way through a hole.

The hub is provided with a through hole for the spring seat to pass through and slide, and the diameter of the connecting end of the ejector rod and the spring seat is larger than that of the through hole.

The ends of the screw rods in the two brake units are respectively contacted with the upper shoe and the lower shoe.

The utility model has the advantages as follows:

The utility model has the advantages of compact structure, it is reasonable, it is practical, the operation is simple and convenient, under the condition that need not dismantle the brake drum, pass the last through-hole installation spring ejector pin mechanism of wheel hub, when regulating spring wherein is in under the natural state, this mechanism does not have the influence to normal braking function, and when maintenance or installation need be with the brake clearance back-tuning, then only need exert external force at the spring holder tip that is located the wheel hub outside, the spring holder passes wheel hub and gives inboard ejector pin with power transmission, the ejector pin motion and upwards apply force in the protruding bottom of self-modulation board, thereby self-modulation board is by jack-up and break away from with the tooth of ratchet, and then can rotate the ratchet, drive and its complex screw rod to the inside indentation that removes of hydraulic pressure wheel cylinder, finally increase distance between screw rod tip and the wheel hub, then can pack into new thicker shoe, realize the back-tuning of brake clearance.

The utility model discloses still include following advantage:

The adjusting spring is sleeved between the spring seat and the outer side of the hub and automatically rebounds when the application of external force is finished, so that the mechanism is restored to the initial position; the adjusting spring also plays a role in flexibly connecting the spring seat and the hub in a natural state, so that the spring seat and the hub which are not fixedly connected do not collide with each other due to travelling fluctuation in the travelling process of the vehicle;

The adjusting spring is in small clearance fit with the spring seat, and when the spring seat moves under the action of external force, the adjusting spring is stressed and compressed and plays a role in guiding;

The inward concave characteristic of the raised bottom of the end part of the self-adjusting shifting plate reduces the deviation of the ejector rod due to surface sliding after contacting the self-adjusting shifting plate; along with the clearance self-modulation of brake unit, the auto-modulation dial plate can rotate a little around the housing washer at hydraulic pressure wheel cylinder top, and the indent plays the guide effect when the ejector pin application of force has the skew for the auto-modulation dial plate still can be jack-up smoothly by the ejector pin after the rotation a little, has increased the mechanism flexibility, makes things convenient for in personnel's operation more.

Drawings

fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is an exploded view of fig. 2.

Fig. 4 is a partial bottom view (sectional view) of fig. 1.

Fig. 5 is the installation schematic diagram of the self-adjusting shifting plate, the self-adjusting tension spring, etc.

Fig. 6 is a schematic structural view of the self-adjusting shifting plate of the present invention.

Fig. 7 is a schematic structural diagram of the plate of the present invention.

Wherein: 1. a hub; 101. a through hole; 2. a hydraulic wheel cylinder; 3. a hold-down bolt; 4. a self-adjusting dial plate; 41. a circular hole; 42. a clamping end; 43. a dialing end is adjusted; 44. a protrusion; 45. a first bayonet; 46. a second bayonet; 5. a ratchet wheel; 6. a screw; 7. self-adjusting tension springs; 8. a plate member; 81. a body; 82. a lug; 83. a third bayonet; 9. a return spring; 10. a lower horseshoe; 11. mounting a horseshoe; 12. a top rod; 13. a spring seat; 14. the spring is adjusted.

Detailed Description

the following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1, 2 and 3, the drum brake with the spring ejector mechanism of this embodiment includes a hub 1, an upper shoe 11 and a lower shoe 10 that are semi-arc-shaped are symmetrically provided on an inner side surface of the hub 1 from top to bottom, two sets of return springs 9 are installed between the upper shoe 11 and the lower shoe 10, brake units are symmetrically installed on the hub 1 located at a gap between the upper shoe 11 and the lower shoe 10, and a single brake unit has a structure that: the automatic adjusting device comprises a hydraulic wheel cylinder 2 fixed on a wheel hub 1, wherein an automatic adjusting plate 4 is rotatably arranged outside a cylinder body of the hydraulic wheel cylinder 2 through a compression bolt 3, a screw rod 6 and a plate 8 which are connected with a piston of the hydraulic wheel cylinder 2 are arranged at the end part of the hydraulic wheel cylinder 2, the plate 8 is sleeved on the screw rod 6, a ratchet wheel 5 which moves in a matched manner with the screw rod 6 is arranged on the screw rod 6, as shown in figure 5, one end of the automatic adjusting plate 4 is clamped with the plate 8, the other end of the automatic adjusting plate is contacted with teeth on the periphery of the ratchet wheel 5, and an;

as shown in fig. 4, a spring seat 13 is arranged on the outer side surface of the hub 1, the spring seat 13 penetrates through the hub 1, an ejector rod 12 is fixedly installed at the end part of the hub 1, the ejector rod 12 is positioned below the end part of the self-adjusting dial plate 4, an adjusting spring 14 is further sleeved on the spring seat 13 positioned on the outer side surface of the hub 1, the adjusting spring 14 plays a role in flexible connection between the spring seat 13 and the hub 1 in a natural state, plays a role in resetting in a compression state, and plays a role in guiding the movement of the spring seat 13 when external force is applied to the spring seat 13.

as shown in fig. 6, the structure of the auto-dialing plate 4 is: one end of the self-adjusting plate is provided with a round hole 41 matched with the compression bolt 3, a clamping end 42 extends towards the side edge, the outer side of the clamping end 42 is provided with a first clamping opening 45, the inner side of the first clamping opening 45 is provided with a second clamping opening 46, the first clamping opening 45 is connected with the self-adjusting tension spring 7 in a clamping mode, and the second clamping opening 46 is connected with a third clamping opening 83 on the plate 8 in a clamping mode; the other end of the self-adjusting dialing plate 4 extends to form a bent dialing end 43, and the end part of the dialing end 43 is contacted with the teeth of the ratchet wheel 5; the middle part of the self-adjusting dial plate 4 extends outwards, a bulge 44 formed by stamping is arranged at the extending end part, the bottom of the bulge 44 is concave and is positioned above the ejector rod 12, the concave characteristic ensures that the ejector rod 12 can jack the self-adjusting dial plate 4 up smoothly, and the flexibility of the mechanism is increased.

As shown in fig. 7, the plate member 8 has a structure of: the self-adjusting shifting device comprises a body 81 connected with a piston of a hydraulic wheel cylinder 2, wherein a hole is formed in the body 81 and sleeved on a screw 6, the body 81 extends towards the side edge and is provided with a third bayonet 83 at the end part, and the third bayonet 83 is clamped with a second bayonet 46 on a self-adjusting shifting plate 4; the body 81 is also extended with a bent lug 82, and the lug 82 is provided with a hole and is connected with the self-adjusting tension spring 7 in a clamping way through the hole.

the hub 1 is provided with a through hole 101 for the spring seat 13 to pass through and slide, and the diameter of the connecting end of the ejector rod 12 and the spring seat 13 is larger than that of the through hole 101.

The end parts of the screw rods 6 in the two braking units are respectively contacted with the upper shoe 11 and the lower shoe 10, and in the braking process, the screw rods 6 are driven by the hydraulic wheel cylinder 2 to move outwards and apply force to the upper shoe 11 and the lower shoe 10 to be attached to the rotating hub 1, so that braking is realized; after braking, the upper shoe 11 and the lower shoe 10 are pulled back by the return spring 9 to be separated from the hub 1.

The utility model discloses a theory of operation does:

When the braking gap needs to be reversely adjusted during maintenance or installation, an external force is applied to the end part of the spring seat 13 positioned on the outer side of the hub 1, the spring seat 13 penetrates through the hub 1 to transmit the force to the inner ejector rod 12 connected with the inner ejector rod, the ejector rod 12 moves and applies upward force to the bottom of the bulge 44 of the self-adjusting plate 4, so that the self-adjusting plate 4 is jacked up and separated from the teeth of the ratchet wheel 5, the ratchet wheel 5 can be further rotated to drive the screw rod 6 matched with the screw rod to move towards the inside of the hydraulic wheel cylinder 2 and retract, the distance between the end part of the screw rod 6 and the hub 1 is increased, reverse adjustment of the braking gap is realized, and a new thicker shoe can be loaded or operations such.

The utility model discloses simple structure, it is with low costs, convenient operation, the practicality is strong, is suitable for using widely, and is compatible strong, has improved operating personnel's efficiency greatly.

The above description is for the purpose of explanation and not limitation of the invention, which is defined in the claims, and any modifications may be made within the scope of the invention.

Claims

1. The utility model provides a drum brake with spring ejector mechanism, includes wheel hub (1), wheel hub (1) medial surface longitudinal symmetry is provided with horseshoe (11) and lower horseshoe (10) of semicircle arcuation, goes up and installs two sets of return spring (9), its characterized in that between horseshoe (11) and lower horseshoe (10): the brake units are symmetrically arranged on the hub (1) positioned at the gap between the upper shoe (11) and the lower shoe (10), and the structure of each brake unit is as follows: the automatic adjusting device comprises a hydraulic wheel cylinder (2) fixed on a wheel hub (1), wherein a self-adjusting shifting plate (4) is rotatably installed outside a cylinder body of the hydraulic wheel cylinder (2) through a pressing bolt (3), a screw rod (6) and a plate (8) which are connected with a piston of the hydraulic wheel cylinder (2) are installed at the end part of the hydraulic wheel cylinder (2), the plate (8) is sleeved on the screw rod (6), a ratchet wheel (5) which moves in a matched mode with the screw rod (6) is installed on the screw rod (6), one end of the self-adjusting shifting plate (4) is connected with the plate (8) in a clamped mode, the other end of the self-adjusting shifting plate is in contact with teeth on the periphery of the ratchet wheel (;

The automatic adjusting device is characterized in that a spring seat (13) is arranged on the outer side face of the wheel hub (1), the spring seat (13) penetrates through the wheel hub (1) and is fixedly provided with a push rod (12) at the end part of the wheel hub, an adjusting spring (14) is further sleeved on the spring seat (13) located on the outer side face of the wheel hub (1), and the push rod (12) is located below the end part of the automatic adjusting shifting plate (4).

2. A drum brake with a spring ram mechanism as claimed in claim 1, said drum brake further comprising: the structure of the self-adjusting dial plate (4) is as follows: one end of the self-adjusting plate is provided with a round hole (41) matched with the compression bolt (3), a clamping end (42) extends towards the side edge, the outer side of the clamping end (42) is provided with a first clamping opening (45), the inner side of the first clamping opening (45) is provided with a second clamping opening (46), the first clamping opening (45) is connected with the self-adjusting tension spring (7) in a clamping mode, and the second clamping opening (46) is connected with the plate (8) in a clamping mode; the other end of the self-adjusting shifting plate (4) extends to form a bent shifting end (43), and the end part of the shifting end (43) is contacted with the teeth of the ratchet wheel (5); the middle part of the self-adjusting dialing plate (4) extends outwards, a bulge (44) formed by stamping is arranged at the extending end part, and the bottom of the bulge (44) is concave inwards and is positioned above the ejector rod (12).

3. a drum brake with a spring ram mechanism as claimed in claim 1, said drum brake further comprising: the structure of the plate (8) is as follows: the automatic adjusting device comprises a body (81) connected with a piston of a hydraulic wheel cylinder (2), wherein a hole is formed in the body (81) and sleeved on a screw rod (6), the body (81) extends to the side edge and is provided with a third bayonet (83) at the end part, and the third bayonet (83) is clamped with an automatic adjusting and stirring plate (4); the body (81) is also extended with a bent lug (82), and the lug (82) is provided with a hole and is connected with the self-adjusting tension spring (7) in a clamping way through the hole.

4. A drum brake with a spring ram mechanism as claimed in claim 1, said drum brake further comprising: a through hole (101) for a spring seat (13) to penetrate through and slide is formed in the hub (1), and the diameter of the connecting end of the ejector rod (12) and the spring seat (13) is larger than that of the through hole (101).

5. A drum brake with a spring ram mechanism as claimed in claim 1, said drum brake further comprising: the ends of the screw rods (6) in the two brake units are respectively contacted with an upper shoe (11) and a lower shoe (10).