CN205978199U - Novel programmed type braking clearance automatic adjustment arm - Google Patents

Abstract

The utility model relates to a new type of program-controlled brake gap automatic adjustment arm, which includes a body, a connecting fork, a rack and a clutch assembly; One end of the worm is connected to the body through the first blocking cover, and the other end is connected to the gear through the clutch spring; the worm is fixedly connected to the magnetic ring, and the body is equipped with a forward and reverse sensor, which is connected to the electronic control unit , the electronic control unit is connected to the display system in the cab, and the forward and reverse sensors are provided with four leads, which output two signals OUTA and OUTB with phase difference. The new program-controlled brake gap automatic adjustment arm of the utility model adopts forward and reverse sensors, and the detection sensitivity is high. By calculating the working times and adjustment amount of the automatic adjustment arm, the wear state of the brake pad and the motion state of the automatic adjustment arm can be grasped. Easy to use, high safety and reliability, and strong practicability.

Description

A new program-controlled brake gap automatic adjustment arm

technical field

The utility model relates to the technical field of automobile machinery, in particular to a novel program-controlled brake gap automatic adjustment arm.

Background technique

The automatic adjustment arm can compensate the wear gap between the brake drum and the brake pad, so that the brake gap between the two can be maintained at a constant value, which improves the safety of the automobile brake mechanism. However, due to the different road conditions and vehicle weight, the wear degree of the brake drum and the brake pads are different. When the wear of the brake pads reaches 10mm, the brake pads need to be replaced, and the current automatic adjustment arm cannot judge this data. , and most of the current adjustment arms have technical problems such as low safety, poor versatility, and adjustment failure.

Therefore it is necessary to design a novel program-controlled brake gap automatic adjustment arm to overcome the above problems.

Utility model content

The purpose of the utility model is to overcome the defects of the prior art and provide a new program-controlled brake gap automatic adjustment arm with high detection sensitivity, convenient use and high safety and reliability.

The utility model is achieved in that:

The utility model provides a new type of program-controlled brake gap automatic adjustment arm, which includes a body, a connecting fork, a rack and a clutch assembly; One end of the bar is rotationally connected by a small shaft pin; a worm gear is installed at the lower end of the body, the worm gear is connected to the body through a cover plate, and meshes with the camshaft of the brake, and a sealing washer is installed between the two ends of the worm wheel and the body;

The clutch assembly includes a gear, a clutch spring and a worm, the gear meshes with the rack; one end of the worm is connected to the body through the first blocking cover, the other end is connected to the gear through the clutch spring, and connected to the body through the second blocking cover. An O-ring is provided between the second blocking cover and the worm, a wave spring is provided between the body and the worm, the worm is engaged with the worm wheel, a stop spring is provided between the worm and the first blocking cover, and a spring is provided between the body and the worm. with thrust washers;

The worm is fixedly connected to the magnetic ring, and the body is provided with a forward and reverse sensor, which is connected to the electronic control unit. The S pole of the magnetic steel of the magnetic ring faces the forward and reverse sensor, and the forward and reverse sensor is provided with four leads. Output two signals OUTA and OUTB with phase difference, OUTA is the direction signal, OUTB is the angle signal, the electronic control unit is connected to the display system in the cab, the display system includes sound alarm and light alarm;

The electronic control unit includes a single-chip microcomputer, a braking signal processing unit, a storage circuit, a counting circuit, an A/D converter, an alarm component drive circuit, and a power supply circuit connected to a car battery. circuit, A/D converter, alarm element drive circuit, and power supply circuit, the alarm element drive circuit is connected to the CAN controller, the output end of the CAN controller is connected to the CAN transceiver, and the output end of the CAN transceiver is connected to the display system Connection, the A/D converter is connected with the forward and reverse sensor.

Further, the outer diameter of the magnetic ring is 19.9mm, and the inner diameter is 14.3mm.

Further, the body is fixedly connected with a dust cover, and the dust cover is arranged on the rack.

Further, an oil nozzle is installed on the body, and the oil nozzle is connected with the worm wheel and the worm.

Further, the transmission ratio of the worm and the worm gear is 24:1.

Further, when the worm wheel rotates 1° relative to the main body, the gap between the brake drum and the brake pad is correspondingly adjusted to 0.1mm.

The utility model has the following beneficial effects:

The new program-controlled brake gap automatic adjustment arm of the utility model can automatically adjust the gap between the brake drum and the brake pad in the brake, so that the synchronization effect can be achieved during braking, and no deviation will be achieved. At the same time, forward and reverse sensors are used to detect The sensitivity is high, and the collected signals are stored, counted and calculated to obtain the working times and adjustment amount of the automatic adjustment arm, so as to grasp the wear state of the brake pads and the movement state of the automatic adjustment arm. It is easy to use, high in safety and reliability, and practical. powerful.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of the new program-controlled braking gap automatic adjustment arm provided by the utility model;

Fig. 2 is a schematic structural view of the clutch assembly provided by the utility model;

Fig. 3 is a schematic circuit diagram of the new program-controlled braking gap automatic adjustment arm provided by the utility model.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Fig. 1, Fig. 2 and Fig. 3, the new program-controlled brake gap automatic adjustment arm of the utility model includes a body 1, a connecting fork 2, a rack 3 and a clutch assembly 4.

The connecting fork 2 is connected with the connecting hole on the upper end of the body 1 through the large shaft pin 11, and one end of the connecting fork 2 is connected with the end of the rack 3 through the small shaft pin 12, so that the movement of the connecting fork 2 will drive the rack 3 to move.

The lower end of the main body 1 is equipped with a worm gear 5, which is connected to the main body 1 through a cover plate 51 and meshed with the camshaft of the automobile brake. A sealing washer 52 is installed between the two ends of the worm gear 5 and the main body 1.

The clutch assembly 4 includes a gear 41, a clutch spring 42 and a worm 43, the gear 41 meshes with the rack 3, one end of the worm 43 is connected to the body 1 through the first blocking cover, and the other end is socketed with the gear 41 through the clutch spring 42, And connect to the body 1 through the second blocking cover 45, an O-ring 46 is arranged between the second blocking cover 45 and the worm 43, and a wave spring 47 is arranged between the second blocking cover 45 and the worm 43, the worm 43 is engaged with the worm wheel 5, and the worm A stop spring is provided between 43 and the first blocking cover, and a thrust washer is provided between the body 1 and the worm 43 to reduce the friction generated by the rotation of the worm 43 .

The worm 43 is fixedly connected with the magnetic ring 53, the outer diameter of the magnetic ring 53 is 19.9mm, and the inner diameter is 14.3mm. The body 1 is provided with a forward and reverse sensor 6, the forward and reverse sensor 6 is connected to the electronic control unit 7, the S pole of the magnetic steel of the magnetic ring 53 faces the forward and reverse sensor 6, and the forward and reverse sensor 6 is provided with four lead wires, Output two signals OUTA and OUTB with phase difference, OUTA is the direction signal, the forward rotation is high level, the reverse rotation is low level, and the original state is maintained when not rotating. OUTB is an angle signal, and outputs pulses when rotating, and one pulse cycle represents a certain angle value. The electronic control unit 7 is connected to a display system 83 in the cab, and the display system 83 includes a sound alarm 81 and a light alarm 82 .

The electronic control unit 7 includes a single-chip microcomputer 71, a brake signal processing unit 79, a storage circuit 77, a counting circuit 78, an A/D converter 72, an alarm element drive circuit 73 and a power supply circuit 76 connected with a car battery, and the power supply circuit 76 supplies the entire circuit power. Single-chip microcomputer 71 is respectively connected with brake signal processing unit 79, storage circuit 77, counting circuit 78, A/D converter 72, alarm element drive circuit 73, power supply circuit 76, alarm element drive circuit 73 is connected with CAN controller 74, CAN The output end of the controller 74 is connected with the CAN transceiver 75, the output end of the CAN transceiver 75 is connected with the display system 83, the A/D converter 72 is connected with the forward and reverse sensor 6, and the forward and reverse sensor 6 is collected. The converted signal is sent to the single chip microcomputer 71.

The body 1 is fixedly connected with a dust cover, and the dust cover is arranged on the rack 3 to prevent dust from entering the clutch assembly 4 . An oil nozzle 13 is installed on the body 1, and the oil nozzle 13 is connected with the worm wheel 5 and the worm screw 43.

Through design, the transmission ratio of the worm screw 43 and the worm wheel 5 is 24:1. The worm wheel 5 rotates 1° relative to the main body 1, and the gap between the brake drum and the brake pad is correspondingly adjusted to be 0.1mm.

When the car brakes, the brake air chamber pushes the push rod of the brake air chamber to move towards the connection fork 2 under the action of compressed air, and pushes the connection fork 2 to rotate around the connection between the connection fork 2 and the body 1, and at the same time drives The rack 3 connected with the connection fork 2 moves in the direction away from the gear 41, the gear 41 drives the worm 43 to rotate along the axis of the worm 43 through the clutch spring 42, and then drives the worm 5 to rotate through the worm 43, so that the worm 5 rotates at a certain angle , until the gap between the brake drum and the brake pad in the brake is eliminated, that is, the brake drum is in contact with the brake pad, and the brake is completed. The forward and reverse sensor 6 senses the rotation direction and angle of the magnetic ring 53, and then transmits the signal to the electronic control unit 7. After the electronic control unit 7 receives the signal, it counts, calculates and stores the position of the worm wheel 5 in the automatic adjustment arm relative to the main body 1. Direction of rotation and angular displacement. When the brake is finished, under the tension of the brake return spring, the push rod of the brake chamber moves away from the connection fork 2, and drives the rack 3 to move towards the gear 41. At this time, the stop spring and the worm 43 are locked , so that the worm 43 does not rotate with the rotation of the gear 41, thereby the adjusted rotation angle of the worm wheel 5 is retained until the next braking adjustment.

When the worm 43 works normally, the magnetic ring 53 rotates intermittently with the worm 43. When the high level of OUTA is detected, OUTB pulses are counted; when the count reaches a certain value, if the low level of OUTA is detected or the original state is maintained, then Clear the last count, and feed back the signal to the electronic control unit 7, the electronic control unit 7 will display the fault information on the display system 83, and start the sound alarm 81 or light alarm 82 to remind the driver to check the automatic adjustment arm or replace it. brake pads.

In summary, the new program-controlled brake gap automatic adjustment arm of the utility model can automatically adjust the gap between the brake drum and the brake pad in the brake, so that the synchronization effect can be achieved during braking, and the deviation will not occur. The reverse sensor has high detection sensitivity. The collected signals are stored, counted and calculated to obtain the working times and adjustment amount of the automatic adjustment arm, so as to grasp the wear state of the brake pads and the movement state of the automatic adjustment arm. It is easy to use, safe and reliable High performance and strong practicability.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (6)

1. A new type of program-controlled brake gap automatic adjustment arm, characterized in that it includes a body, a connecting fork, a rack and a clutch assembly; the connecting fork is connected to the connecting hole at the upper end of the body through a large pivot pin, One end of the connecting fork is rotationally connected to one end of the rack through a small shaft pin; a worm gear is installed at the lower end of the body, and the worm gear is connected to the body through a cover plate and meshed with the camshaft of the brake. A sealing washer is installed between the two ends of the worm wheel and the body; The clutch assembly includes a gear, a clutch spring and a worm, and the gear meshes with the rack; one end of the worm is connected to the body through a first blocking cover, and the other end passes through the clutch spring to connect to the The gear is socketed and connected to the body through the second blocking cover. An O-shaped sealing ring is provided between the second blocking cover and the worm, and a wave spring is provided between the second blocking cover and the worm. The worm and the worm The worm gears are meshed, a stop spring is provided between the worm and the first blocking cover, and a thrust washer is provided between the body and the worm; The worm is fixedly connected with a magnetic ring, the body is provided with a forward and reverse sensor, the forward and reverse sensor is connected to the electronic control unit, the S pole of the magnetic steel of the magnetic ring faces the forward and reverse sensor, The forward and reverse sensor is provided with four lead wires, and outputs two signals OUTA and OUTB with phase difference, the OUTA is a direction signal, and the OUTB is an angle signal, and the electronic control unit is connected to the display system in the cab. The display system includes an acoustic alarm and a light alarm; The electronic control unit includes a single-chip microcomputer, a braking signal processing unit, a storage circuit, a counting circuit, an A/D converter, an alarm element drive circuit and a power supply circuit connected to a car battery, and the single-chip microcomputer is respectively connected with the braking signal processing unit. The unit, the storage circuit, the counting circuit, the A/D converter, the alarm element drive circuit, and the power supply circuit are connected, the alarm element drive circuit is connected to a CAN controller, and the CAN controller The output end of the CAN transceiver is connected with the CAN transceiver, the output end of the CAN transceiver is connected with the display system, and the A/D converter is connected with the forward and reverse sensor. 2. The new program-controlled brake gap automatic adjustment arm according to claim 1, characterized in that: the outer diameter of the magnetic ring is 19.9 mm, and the inner diameter is 14.3 mm. 3. The new program-controlled brake gap automatic adjustment arm according to claim 1, characterized in that: the body is fixedly connected to a dust cover, and the dust cover is arranged on the rack. 4. The new program-controlled brake gap automatic adjustment arm according to claim 1, characterized in that: said body is equipped with an oil nozzle, and said oil nozzle is connected with a worm wheel and a worm. 5. The new program-controlled brake gap automatic adjustment arm according to claim 1, characterized in that: the transmission ratio between the worm and the worm wheel is 24:1. 6. The new program-controlled brake gap automatic adjustment arm according to claim 5, characterized in that: the worm wheel rotates 1° relative to the body, and the corresponding gap between the brake drum and the brake pad is adjusted to 0.1mm .