CN214465853U

CN214465853U - Multistage transmission mechanism

Info

Publication number: CN214465853U
Application number: CN202022663401.9U
Authority: CN
Inventors: 田草原
Original assignee: Bazhou Huacheng Automobile Brake Co ltd
Current assignee: Bazhou Huacheng Automobile Brake Co ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-10-22
Anticipated expiration: 2030-11-18

Abstract

The utility model discloses a multistage drive mechanism, motor reduction gears, worm wheel and screw rod for driving, motor reduction gears's output axle head with the one end transmission of worm is connected, the worm with the worm wheel slope is arranged the meshing and is connected, the inside threaded connection of worm wheel has the screw rod, the one end of piston with back brake shoe fixed connection, the other end bump of piston with the worm wheel contact. The utility model discloses think about ingenious, compact structure is reasonable, and simple to operate is swift, collects worm gear, screw rod swivel nut in an organic whole, and motor drive transmission reacts rapidly, vibrates for a short time, and the noise is low.

Description

Multistage transmission mechanism

Technical Field

The utility model relates to a drive mechanism technical field especially relates to a multistage drive mechanism.

Background

At present, two types of mechanical transmission are common in modern industry: worm and gear transmission and screw and thread sleeve transmission. The worm and gear is used for transmitting motion and power between two staggered shafts in space, the transmission is changed into another transmission in the vertical direction, and the worm and gear has the advantages of large transmission ratio, small volume, stable operation and low noise during transmission. The screw thread sleeve mainly converts rotary motion into linear motion or converts linear motion into rotary motion, has simple structure, low manufacturing cost and self-locking function, but has large friction resistance moment and low transmission efficiency (30-40%). In popular terms, the worm gear and the worm are in staggered shafting transmission and can only transmit; the screw thread sleeve belongs to parallel shafting transmission, and can transmit and also can be fastened.

In order to solve the problem that exists above, the utility model provides a worm gear collects screw rod swivel nut in novel drive mechanism of an organic whole is used for solving above-mentioned not enough, satisfies crisscross and parallel biax system transmission and auto-lock demand.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a multistage drive mechanism to satisfy crisscross and parallel biax system transmission and auto-lock demand.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the utility model relates to a multistage drive mechanism, motor reduction, worm wheel and screw rod for the drive, motor reduction's output axle head with the one end transmission of worm is connected, the worm with the worm wheel slope is arranged the meshing and is connected, the inside threaded connection of worm wheel has the screw rod, the one end and the back brake shoe fixed connection of piston, the other end bump of piston with the worm wheel contact.

Further, motor reduction gears's output shaft end with the tail end of worm alternates the cooperation and is connected, the head number of worm sets up to, the number of teeth of worm wheel sets up to 22, the worm wheel with the transmission screw thread outer wall of worm is 20 pressure angle and meshes mutually, the pitch of screw rod sets up to 2mm, and the tooth form angle of screw rod sets up 30, the fluting one end of piston with the horseshoe contact and the interlock of back brake shoe are motionless, the steel ball convex surface one end of piston with the concave surface one end contact of worm wheel just has relative roll trend.

Still further, the motor reduction mechanism specifically adopts two-stage planetary gear reduction, the transmission ratio of each stage is 4.5, the transmission ratio of the worm wheel and the worm is 11, the transmission ratio of the worm wheel and the screw is 11, and the total transmission ratio is 222.75.

Still further, the number of teeth of the worm wheel is designed to be 22, the modulus is set to be 0.65, the pressure angle is set to be 20 degrees, the thread pitch is designed to be 2, the number of heads of the worm is designed to be 2, the modulus is designed to be 0.65, and the thread pitch is set to be 2.041.

Furthermore, one end of the piston is provided with a U-shaped groove, and the U-shaped groove is in occlusion connection with a shoe of the rear brake shoe; one end of the piston is connected with a steel ball, and the steel ball protrudes out of the end face of the piston and is abutted against the concave face of the worm wheel; one end of the screw rod is in threaded connection with an inner hole of the worm wheel, and the other end of the screw rod is provided with a groove which is in contact with a shoe at the upper end of the front brake shoe and is connected with the shoe in a meshing manner.

Compared with the prior art, the utility model discloses a beneficial technological effect:

the utility model discloses multistage drive mechanism, including motor reduction gears, worm wheel and the screw rod that the drive used, the output axle head of motor reduction gears is connected with the one end of worm and forms the first order transmission, and the worm is arranged with the worm wheel slope and is meshed the connection and form the second grade transmission, and the inside of worm wheel forms tertiary transmission through threaded connection with the screw rod, and screw rod, piston drive the transmission connection of both sides part and form the fourth grade transmission, and the worm wheel is regarded as the swivel nut, and the piston of one end is independent, and the screw rod of one end is screwed in and is screwed out; the multi-stage transmission mechanism can meet the requirements of staggered and parallel double-shaft system transmission; the transmission ratio of the transmission mechanism can be selectively adjusted along with use, the vibration is small, the noise is low, and the service life is long; the transmission mechanism integrates a worm gear and a worm rod with a screw rod and a threaded sleeve, and has the advantages of simple structure, cost saving, unique process, high reaction speed and low failure rate.

Generally speaking, the utility model discloses think about ingenious, compact structure is reasonable, and simple to operate is swift, collects worm gear, screw rod swivel nut in an organic whole, and motor drive transmission reacts rapidly, vibrates for a short time, and the noise is low.

Drawings

The present invention will be further explained with reference to the following description of the drawings.

FIG. 1 is a front view of the multi-stage transmission mechanism of the present invention;

FIG. 2 is a top view of the multi-stage transmission mechanism of the present invention;

FIG. 3 is a schematic view of the usage state of the present invention;

description of reference numerals: 1. a worm; 2. a piston; 3. a worm gear; 4. a screw; 5. a front brake shoe; 6. a rear brake shoe; 7. and adjusting the ratchet wheel.

Detailed Description

As shown in fig. 1-3, a multi-stage transmission mechanism comprises a motor reduction mechanism for driving, a worm 1, a worm wheel 3 and a screw rod 4, wherein an output shaft end of the motor reduction mechanism is in transmission connection with one end of the worm 1, the worm 1 and the worm wheel 3 are obliquely arranged and meshed with each other, the screw rod 4 is in threaded connection with the inside of the worm wheel 3, one end of a piston 2 is fixedly connected with a rear brake shoe 6, and a salient point at the other end of the piston 2 is in contact with the worm wheel 3.

Specifically, motor reduction gears's output shaft end with the tail end of worm 1 alternates the cooperation and is connected, the head number of worm 1 sets up to 2, the number of teeth of worm wheel 3 sets up to 22, worm wheel 3 with the transmission screw outer wall of worm 1 is 20 pressure angle and meshes mutually, the pitch of screw rod 4 sets up to 2mm, and the tooth form angle of screw rod 4 sets up 30, the fluting one end of piston 2 with the horseshoe contact and the interlock of back brake shoe 6 are motionless, the steel ball convex surface one end of piston 2 with the concave surface one end contact of worm wheel 3 just has the relative roll trend.

The motor speed reducing mechanism specifically adopts a two-stage planetary gear for speed reduction, the transmission ratio of each stage is 4.5, the transmission ratio of the worm wheel 3 to the worm 1 is 11, the transmission ratio of the worm wheel 3 to the screw rod 4 is 11, and the total transmission ratio is 222.75.

The number of teeth of the worm wheel 3 is designed to be 22, the modulus is set to be 0.65, the pressure angle is set to be 20 degrees, the thread pitch is designed to be 2, the number of heads of the worm 1 is designed to be 2, the modulus is designed to be 0.65, and the thread pitch is set to be 2.041.

Specifically, in one embodiment, the number of teeth of the worm wheel 3 is designed to be Z₂22, the modulus is set to 0.65, the lead angle is set to 20 °, the pitch is set to 2, the pitch diameter is 14.3mm, the base circle is 13.43mm, the deflection coefficient is 0.6, the crest height coefficient is 1, the tip clearance coefficient is 0.25, and the tooth form angle is 30 °.

The number of the heads of the worm 1 is designed to be Z₁The modulus is designed to be 0.65, the pitch is set to 2.041, and the lead is 4.082.

According to the actual required transmission ratio, the relevant parameters can be properly adjusted.

One end of the piston 2 is provided with a U-shaped groove, and the U-shaped groove is meshed and connected with a shoe of the rear brake shoe 6; one end of the piston 2 is connected with a steel ball, and the steel ball protrudes out of the end face of the piston 2 and is abutted with the concave face of the worm wheel 3; one end of the screw rod 4 is in threaded connection with an inner hole of the worm wheel, and the other end of the screw rod is provided with a groove which is in contact with a shoe iron at the upper end of the front brake shoe 5 and is connected together in a meshing manner.

The utility model discloses a use as follows:

when the worm gear is in work, other speed reducing mechanisms are used as input ends, specifically, a motor speed reducing mechanism is adopted, the output end of the motor speed reducing mechanism is fixedly connected with one end of a worm through a plug, a pin or a positioning key, the motor starts to rotate and transmits the rotation to the worm 1, the worm 1 drives the worm wheel 3 to roll relatively with the meshing position of the worm wheel 3, the worm wheel gradually enters the meshing process and gradually exits the meshing process to realize transmission, the piston 2 is an independent part, one end of the piston does not rotate, a convex point at the other end of the piston is in contact with the worm wheel 3 and has a relative rolling trend, and the worm wheel 3 is used as a screw sleeve to be matched with the screw rod 4 to be used as the screw sleeve; because the worm wheel 3 (the threaded sleeve) rotates, the piston 2 is contacted with one end of the piston relatively and is not moved, and the other end of the piston causes the screw rod 4 to roll to generate a stroke to eject towards one end, so that ejection force is generated.

The transmission mechanism is installed on an automobile brake disc, one end of a groove of the piston 2 is in contact with and fixedly occluded with a shoe at the upper end of a rear brake shoe 6, one end of a convex surface of a steel ball of the piston 2 is in contact with one end of a concave surface of the worm wheel 3 and has a relative rolling trend, one end of the screw rod 4 is in threaded connection with an inner hole of the worm wheel, and the groove at the other end of the screw rod is in contact with and occluded with the shoe at the upper end of a front brake shoe 5; when braking, because the worm wheel 3 (threaded sleeve) rotates, the piston 2 is contacted with one end of the piston relatively immovably, and one end of the piston causes the screw rod 4 to rotate and roll to generate a stroke to eject out towards the direction of the front brake shoe 1, so that the upper ends of the front brake shoe and the rear brake shoe are respectively separated from the screw rod 4 and the piston 2, and then the brake shoes are contacted with a rotating brake disc, the brake disc drives the two brake shoes to rotate along the rotating direction under the action of friction torque until the rear brake shoe is abutted against the brake disc, then the brake shoes are further pressed against the brake disc, at the moment, the rear brake shoe is in a force increasing state, and under the action of the force aid of the front brake shoe, the thrust force applied to the lower end of the rear brake shoe by the floating adjusting ratchet wheel 7 is 2-3 times larger than the opening force, and the two brake shoes generate brake torque higher than the normal use brake torque to realize the parking function. When the transmission work is finished, the input end controls the worm 1 to rotate reversely, and the worm returns to the initial position through a series of reverse transmissions.

The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.

Claims

1. A multi-stage transmission mechanism is characterized in that: including motor reduction gears, worm (1), worm wheel (3) and screw rod (4) that the drive used, motor reduction gears's output shaft end with the one end transmission of worm (1) is connected, worm (1) with worm wheel (3) slope is arranged the meshing and is connected, the internal thread connection of worm wheel (3) has screw rod (4), the one end and back brake shoe (6) fixed connection of piston (2), the other end salient point of piston (2) with worm wheel (3) contact.

2. The multi-stage transmission according to claim 1, wherein: motor reduction gears's output shaft end with the tail end of worm (1) alternates the cooperation and connects, the head number of worm (1) sets up to 2, the number of teeth of worm wheel (3) sets up to 22, worm wheel (3) with the transmission screw thread outer wall of worm (1) is 20 pressure angle and meshes mutually, the pitch of screw rod (4) sets up to 2mm, and the tooth form angle of screw rod (4) sets up 30, the fluting one end of piston (2) with the horseshoe contact and the interlock of back brake shoe (6) are motionless, the convex surface steel ball one end of piston (2) with the concave surface one end contact of worm wheel (3) just has the relative roll trend.

3. The multi-stage transmission according to claim 2, wherein: the motor reduction mechanism specifically adopts a two-stage planetary gear for reduction, the transmission ratio of each stage is 4.5, the transmission ratio of the worm wheel (3) to the worm (1) is 11, the transmission ratio of the worm wheel (3) to the screw rod (4) is 11, and the total transmission ratio is 222.75.

4. The multi-stage transmission according to claim 2, wherein: the number of teeth of the worm wheel (3) is designed to be 22, the modulus is set to be 0.65, the pressure angle is set to be 20 degrees, the thread pitch is designed to be 2, the number of heads of the worm (1) is designed to be 2, the modulus is designed to be 0.65, and the thread pitch is set to be 2.041.

5. The multi-stage transmission according to claim 2, wherein: one end of the piston (2) is provided with a U-shaped groove, and the U-shaped groove is meshed and connected with a shoe of the rear brake shoe (6); one end of the piston (2) is connected with a steel ball, and the steel ball protrudes out of the end face of the piston (2) and is abutted against the concave face of the worm wheel (3); one end of the screw rod (4) is in threaded connection with an inner hole of the worm wheel, and the other end of the screw rod is provided with a groove which is in contact with a shoe iron at the upper end of the front brake shoe (5) and is connected together in a meshing manner.