CN212297554U

CN212297554U - Electronic parking actuator with noise reduction structure

Info

Publication number: CN212297554U
Application number: CN202021119291.3U
Authority: CN
Inventors: 王林鹏; 赵洋洋; 刘政; 李祥良; 侯瑞宏; 赵立杰
Original assignee: Shanghai Carthane Co ltd
Current assignee: Jiongyi Electronic Technology Suzhou Co ltd
Priority date: 2020-06-17
Filing date: 2020-06-17
Publication date: 2021-01-05
Anticipated expiration: 2030-06-17

Abstract

The utility model relates to an electronic parking actuator with a noise reduction structure, which comprises a shell, an upper shell cover, a motor, a reduction gear train and a first gear shaft; the reduction gear train comprises a first duplicate gear, a second duplicate gear and a planetary gear mechanism, wherein the first duplicate gear rotates around a first gear shaft, the first duplicate gear comprises a first large gear and a first small gear, and the first large gear is meshed with the motor gear; the second duplicate gear comprises a second gearwheel, a second pinion and a second gear shaft, wherein the second gearwheel is meshed with the first pinion, and the second pinion is meshed with a planetary gear of the planetary gear mechanism. The utility model discloses a gear drive transmits the moment of torsion that the motor produced extremely planetary gear mechanism's output spline through reducing planetary gear axial friction area and improving its lubricated environment, effectively reduces electron parking executor's noise at work.

Description

Electronic parking actuator with noise reduction structure

Technical Field

The utility model relates to an automobile braking field especially relates to an electron parking executor of structure of making an uproar falls.

Background

At present, epb (electrical Park brake) is gradually becoming the mainstream configuration of vehicles, and how to design high-quality products with high customer acceptance is the current main research direction, wherein noise improvement is an important issue. The existing noise improvement scheme is as in scheme 1: patent document CN201380025662.8 discloses an electronic parking actuator assembly, which improves noise by designing an inner and an outer double-layer housing and adding a rubber pad between the inner and the outer housing.

As shown in scheme 2: patent document CN201410256935.6 discloses a parking brake device and a parking brake system, in which a rubber pad is added between a timing belt pressing plate and an upper cover to improve noise.

However, scheme 1 has problems: this patent scheme contains two-stage planetary gear mechanism, and both planetary gear numbers and gear parameter are unanimous, and share an inner gear ring, have the risk that causes abnormal sound resonance.

There is a problem with scheme 2: the reduction gear train is cut apart into a plurality of independent modules, and a plurality of speed reduction modules compare in that the shell is floating structure, and this characteristics have reduced product machining precision, improve product function uniformity, but the executor during operation speed reduction module easily appears rocking phenomenon in the shell. The rubber pad is added, so that the noise can be reduced, but the noise risk brought by the floating structure of the reduction gear train is not changed.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an effective noise reduction electronic parking actuator.

In order to achieve the above object, the utility model discloses an electronic parking executor of structure of making an uproar falls includes:

the shell is connected with the upper shell cover to form a closed working space;

the motor is used for providing power and is arranged in a motor bin arranged in the shell, and the motor is provided with a motor shaft which is pressed with a motor gear;

the reduction gear train is arranged in the shell and comprises a first duplicate gear, a second duplicate gear and a planetary gear mechanism, so that the speed and the torque are reduced, the output torque of the motor is amplified and then is output through an output spline; wherein the content of the first and second substances,

the first duplicate gear comprises a first large gear and a first small gear which are integrally structured, and the first large gear is meshed with the motor gear;

the second duplicate gear comprises a second large gear and a second small gear which are of an integral structure and a second gear shaft which is pressed in a shaft hole of the second small gear, the second large gear is meshed with the first small gear, a first annular boss is arranged on a radial plate on one side of the second large gear so as to reduce the circumferential speed of a boss surface when the electronic parking actuator works and prevent a planetary gear of the planetary gear mechanism from tilting, and the second large gear is a crown gear so as to reduce the whole axial size of the actuator;

the planetary gear mechanism comprises a planet carrier, a plurality of planetary gears and an inner gear ring; the planet gear is a sheet gear with a symmetrical structure, radial plates on two sides of the planet gear are provided with second annular bosses, one side of each second annular boss is abutted against the first annular boss, the other side of each second annular boss is abutted against the planet carrier, an annular groove is formed in the position, where the abutment occurs, on the planet carrier, so that grease can be conveniently stored, and the planet gear is meshed with an inner gear ring and a second pinion and revolves around the second pinion; the radius of a first annular boss of the second gearwheel is smaller than the center distance of the planetary gear mechanism, and the width of the first annular boss is 1mm-4 mm; a plurality of claws are arranged outside the inner gear ring, and the inner gear ring is mounted on the inner wall of the shell;

a first gear shaft mounted in the housing in parallel arrangement with the motor shaft and the second gear shaft, the first duplicate gear rotating about the first gear shaft.

As a specific example, the housing includes:

the inner gear ring clamping groove is clamped with the inner gear ring through clamping jaws outside the inner gear ring;

the output ring surface is matched with a brake caliper mounting matching surface of the brake caliper, and a sealing ring is mounted between the output ring surface and the brake caliper mounting matching surface;

the male end of the plug connector comprises a wiring terminal, one end of the male end of the plug connector is connected with the female end of the plug connector to be connected with a power supply, and the other end of the male end of the plug connector is connected with the motor terminal to transmit an electric signal;

the upper end face flange is positioned on the upper edge of the shell and used for welding an upper shell cover;

a support boss for supporting the first dual gear;

the bushing is used for installing a fixing bolt and fixing the electronic parking actuator assembly on the brake caliper;

the motor cover covers the openable cover body of the motor cabin, and a spring gasket is installed between the motor and the motor cover, and specifically, the spring gasket is a wave spring.

As a specific example, the upper case cover includes: the first axial stopping boss of the duplicate gear is coaxial with the first gear shaft and is in clearance fit with the upper end face of the first duplicate gear;

a plurality of stop boss reinforcing ribs;

the second dual gear axial stopping boss is in clearance fit with the upper end face of the second dual gear;

and the welding groove is matched with the flange on the upper end surface of the shell and used for welding the shell.

As a specific example, the planet carrier comprises an output spline, a plurality of planet shafts, a planet carrier base body and a planet carrier central positioning hole, the planet carrier base body is disc-shaped, and the planet shafts are pressed or injected on the planet carrier base body; the annular groove is arranged on the planet carrier base body and surrounds the planet shaft, and is used for storing grease so as to prevent dry friction between the planet gear and the planet carrier, improve the lubricating condition and reduce the noise; the plurality of planet gears respectively rotate by taking the plurality of planet shafts as shafts, and the planet carrier base body is made of metal or plastic.

As a preferred example, the first large gear is a helical gear, and the first small gear is a helical gear or a spur gear.

As a specific example, the number of the claws on the outside of the ring gear is not less than three.

As a specific example, an annular washer made of rubber or plastic is installed between the inner wall of the housing and the neck of the motor shaft.

As a specific example, the housing has a positioning boss thereon for fixing the motor, and the positioning boss is provided with a fool-proof structure.

As a specific example, the housing and the motor end cap are formed by ultrasonic or laser welding; the shell and the upper shell cover are welded through ultrasonic waves or laser.

As a preferred example, the first dual gear is made of plastic.

As a preferred example, the second gearwheel and the second pinion are made of different materials, the second gearwheel is made of plastic, the second pinion is made of powder metallurgy or metal, and the two are integrally molded.

As a specific example, the planetary gear is made of plastic, powder metallurgy or metal.

Compared with the prior art, electron parking executor have following advantage:

the utility model discloses a reduce planetary gear axial friction area to design the oil storage tank on the planet carrier, reduced electron parking executor's noise at work effectively.

The utility model discloses a design has the annular boss on second gear wheel, planetary gear's the radials to prevent that planetary gear and the big gear radials of second wholly contact and rub, reduced electron parking executor's noise at work.

The utility model discloses a be equipped with the annular groove on the planet carrier, improved planetary gear's lubricated environment, reduced noise at work, prolonged life.

Drawings

Fig. 1 is a cross-sectional view of an electronic parking actuator according to an embodiment of the present invention;

fig. 2 is an exploded view of the electronic parking actuator assembly according to the embodiment of the present invention;

FIG. 3 is an isometric view of the housing according to an embodiment of the present invention;

FIG. 4 is a schematic view of the positioning boss according to the embodiment of the present invention;

FIG. 5 is an isometric view of an upper housing cover according to an embodiment of the present invention;

fig. 6 is a perspective view of a second duplicate gear shaft according to an embodiment of the present invention;

fig. 7 is an isometric view of a carrier according to an embodiment of the present invention;

fig. 8 is a schematic diagram of the position of the planetary gear mechanism cooperating with the second duplicate gear according to the embodiment of the present invention;

fig. 9 is an axonometric view of the inner ring gear according to the embodiment of the present invention.

Description of the symbols in the drawings:

1 casing

1.1 first Gear shaft

1.2 inner gear ring clamping groove

1.3 output annulus

1.4 Male end of plug connector

1.4.1 plug-in connector base body

1.4.2 connecting terminal

1.5 Upper end face Flange

1.6 support the boss

1.7 liner bushing

1.8 positioning boss

2 Upper shell cover

2.1 axial stop boss of first duplicate gear

2.2 stop boss reinforcing rib

2.3 axial stop boss of second duplicate gear

2.4 welding grooves

3 first duplicate gear

3.1 first gearwheel

3.2 first pinion

4 second duplicate gear

4.1 second gearwheel

4.2 second pinion

4.3 second Gear shaft

4.4 first annular boss

5 planetary gear

5.1 second annular Boss

6 planetary carrier

6.1 planetary shaft

6.2 Planet carrier base

6.3 center positioning hole of planet carrier

6.4 annular groove

6.5 output spline

7 inner gear ring

7.1 first step

7.2 second step

7.3 claw

8 ring gasket

9 Motor gear

10 electric machine

10.1 Motor shaft

10.2 Motor neck

10.3 bottom end of motor

10.4 Motor terminal

11 wave spring

12 electric motor cover

Detailed Description

The technical solution of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The first embodiment is as follows:

the embodiment of the utility model provides an electronic parking executor of structure of making an uproar falls, as shown in fig. 1 to fig. 2, including casing 1, last cap 2, first gear shaft 1.1, motor 10, reduction gear.

The upper edge of the shell 1 is provided with an upper end face flange 1.5, and the upper end face flange and the lower end face flange are connected by welding a welding groove 2.4 of the upper shell cover 2 through ultrasonic waves or laser.

A motor bin is arranged in the shell 1, the motor 10 is provided with a motor shaft 10.1, a motor gear 9 is pressed on the motor shaft 10.1, and an annular gasket 8 made of rubber or plastic is arranged between the neck 10.2 of the motor and the inner wall of the shell 1; the motor 10 used for providing power is arranged in the motor bin, the motor bin is further provided with a motor cover 12 capable of being opened and closed, the motor cover 12 and the shell 1 are welded through ultrasonic waves or laser, and a wave spring 11 is arranged between the motor bottom end 10.3 and the motor cover 12 to support the motor 10 and eliminate axial gaps.

As shown in fig. 3 to 4, the housing 1 further includes: the inner gear ring clamping groove 1.2 is clamped with the inner gear ring 7 of the reduction gear train through a clamping jaw 7.3 outside the inner gear ring 7;

the output ring surface 1.3 is matched with a brake caliper mounting matching surface of the brake caliper, and a sealing ring (not shown) is mounted between the output ring surface and the brake caliper mounting matching surface;

the male end 1.4 of the plug connector comprises a wiring terminal 1.4.2, one end of the male end is connected with the female end of the plug connector to be connected with a power supply, and the other end of the male end is connected with the motor terminal 10.4 to transmit an electric signal;

a support boss 1.6 for supporting a first double gear 3 of the reduction gear train;

the bush 1.7 is used for installing a fixing bolt and fixing the electronic parking actuator assembly on a brake caliper

Location boss 1.8 for fixed motor 10, location boss 1.8 sets up prevents slow-witted structure.

As shown in fig. 5, the upper case cover 2 includes: the first dual gear axial stopping boss 2.1 is coaxial with the first gear shaft 1.1, and the first dual gear axial stopping boss 2.1 is in clearance fit with the upper end face of the first dual gear 3; a plurality of stop boss reinforcing ribs 2.2; the second duplicate gear axial stop boss 2.3 is in clearance fit with the upper end face of the second duplicate gear 4, and the second duplicate gear axial stop boss 2.3 is in clearance fit with the upper end face of the second duplicate gear 4.

As shown in fig. 1 to 2, a first gear shaft 1.1 is mounted in the inner cavity of the housing 1, and is arranged in parallel with a motor shaft 10.1 and a second gear shaft 4.3 of the reduction gear train, and a first duplicate gear 3 of the reduction gear train rotates around the first gear shaft 1.1.

The speed reducing gear train is arranged in an inner cavity of the shell 1 and comprises a first duplicate gear 3, a first duplicate gear 3 and a planetary gear mechanism, and the speed reducing gear 3, the first duplicate gear 3 and the planetary gear mechanism are used for reducing the speed and increasing the torque, and the torque output by the motor 10 is amplified and then output through an output spline 6.5 of the planetary gear mechanism; wherein the content of the first and second substances,

the first duplicate gear 3 is supported by the supporting boss 1.6 and rotates around the first gear shaft 1.1; the first duplicate gear 3 comprises a first big gear 3.1 and a first small gear 3.2 which are integrated into a whole, the first big gear 3.1 is meshed with the motor gear 9, the first small gear 3.2 is meshed with a second big gear 4.1 of the second duplicate gear 4, and the motor torque is transmitted to the second duplicate gear 4 through the first duplicate gear 3; in this embodiment, the first gearwheel 3.1 is a helical gear, the first pinion 3.2 is a helical gear or a spur gear, and the first dual gear 3 is preferably made of plastic;

as shown in fig. 6, the second duplicate gear 4 comprises a second large gear 4.1 and a second small gear 4.2 (i.e. a sun gear) which are integrally formed, and a second gear shaft 4.3 pressed in a shaft hole of the second small gear 4.2, wherein the second large gear 4.1 is meshed with the first small gear 3.2, and the second small gear 4.2 is meshed with the planetary gear 5 of the planetary gear mechanism; a first annular boss 4.4 is arranged on a radial plate at one end of the second gearwheel 4.1; the upper end of the second gear shaft 4.3 is positioned in the shaft hole of the second duplicate gear axial stop boss 2.3 of the upper shell cover 2, and the lower end of the second gear shaft is positioned in the planet carrier central positioning hole 6.3; in this embodiment, the second gearwheel 4.1 is a crown gear, the second gearwheel 4.1 and the second pinion 4.2 are made of different materials, the second gearwheel 4.1 is made of plastic, and the second pinion 4.2 is made of powder metallurgy or metal, and the two are integrally molded.

The planetary gear mechanism comprises a planet carrier 6, a plurality of planet gears 5 and an annulus gear 7, wherein,

as shown in fig. 7, the planet carrier 6 includes a plurality of planet shafts 6.1, a planet carrier base 6.2, a planet carrier centrally located hole 6.3, an annular groove 6.4 and an output spline 6.5; the planet shafts 6.1 with the same number as the plurality of planet gears 5 are pressed or injected on the planet carrier base body 6.2; the planet carrier central positioning hole 6.3 is positioned at the central point of the planet carrier base body 6.2, and the lower end of the second gear shaft 4.3 is arranged in the planet carrier central positioning hole 6.3; an annular groove 6.4 is arranged on the planet carrier base body 6.2 around a plurality of planet shafts 6.1 and used for storing grease so as to prevent dry friction between the planet gear 5 and the planet carrier 6, improve the lubricating condition and reduce the noise; the plurality of planetary gears 5 rotate around a plurality of planetary shafts 6.1, respectively; in this embodiment, the planet carrier base 6.2 is disc-shaped, the planet carrier base 6.2 is made of plastic, the planet shaft 6.1 and the output spline 6.5 are made of metal, and an injection molding integrated structure is adopted;

as shown in fig. 8, the plurality of planetary gears 5 are sheet gears with a symmetrical structure, radial plates at two sides of the planetary gears 5 are both provided with second annular bosses 5.1, one side of each second annular boss abuts against a first annular boss 4.4 on a radial plate of a second gearwheel 4.1, the other side of each second annular boss abuts against an annular groove 6.4, the radius of each first annular boss 4.4 is smaller than the center distance of the planetary gear mechanism, and the width of each first annular boss 4.4 is 1mm-4 mm; the planetary gear mechanism is arranged in a crown space of a second big gear 4.1 which is a crown gear so as to reduce the whole axial space of the electronic parking actuator, one end of the planetary gear 5 is meshed with an inner gear ring 7, the other end of the planetary gear is meshed with a second small gear 4.2, the planetary gear revolves around the second small gear 4.2, and power is output by an output spline 6.5; in the present embodiment, the planetary gear 5 is made of plastic, powder metallurgy or metal;

as shown in fig. 9, a plurality of claws 7.3 are arranged outside the inner gear ring 7, the claws 7.3 are clamped in inner gear ring slots 1.2 on the inner wall of the housing 1, and the number of the claws 7.3 is not less than three; the ring gear 7 comprises a first step 7.1, a second step 7.2, wherein the second step 7.2 is used to support the planet carrier 6.

Example two:

the present embodiment has substantially the same structure as the first embodiment, except that the planet carrier base 6.2 is made of metal and is integrated with the output spline 6.5, and the planet shaft 6.1 is press-fitted on the planet carrier base 6.2. An annular recess 6.4 is cold-headed or machined in the planet carrier base body 6.2 about the planet shaft 6.1 for storing grease.

The aforesaid does the utility model discloses a structure is constituteed, the utility model discloses when using, the motor 10 moment of torsion warp reduction gear train, the screw rod swivel nut mechanism that transmits the vehicle by output spline 6.5 after enlargiing motor 10 output torque promotes thereby the piston makes the friction disc press on the brake disc and produce parking brake force.

In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An electronic parking actuator of a noise reduction structure, comprising:

a housing;

the upper shell cover is connected with the shell;

the motor is arranged in a motor cabin in the shell and is provided with a motor shaft, and a motor gear is pressed on the motor shaft;

a reduction gear train mounted within the housing, the reduction gear train including a first duplicate gear, a second duplicate gear, and a planetary gear mechanism; wherein

the second duplicate gear comprises a second large gear and a second small gear which are of an integrated structure, and a second gear shaft which is pressed in a shaft hole of the second small gear, the second large gear is a crown gear, the second large gear is meshed with the first small gear, and a first annular boss is arranged on a radial plate on one side of the second large gear;

the planetary gear mechanism comprises a planet carrier, a plurality of planetary gears and an inner gear ring; the planet gear is a sheet gear with a symmetrical structure, radial plates on two sides of the planet gear are provided with second annular bosses, one side of each second annular boss is abutted against the first annular boss, the other side of each second annular boss is abutted against the planet carrier, annular grooves are formed in positions of the planet carrier where the first annular bosses are abutted against the planet carrier, and the planet gear is meshed with an inner gear ring and a second small gear and revolves around the second small gear; the radius of the first annular boss of the second gearwheel is smaller than the center distance of the planetary gear mechanism; the outer wall of the inner gear ring is provided with a plurality of claws, and the inner gear ring is arranged on the inner wall of the shell;

2. The noise reducing structure of the electronic parking actuator according to claim 1, wherein the housing includes:

the upper end face flange is positioned on the upper edge of the shell and used for welding the upper shell cover;

a support boss for supporting the first dual gear;

the motor cover covers the openable cover body of the motor bin, and a spring gasket is arranged between the motor and the motor cover.

3. The noise reduction structure electric parking actuator according to claim 2, wherein the upper cover includes: the first axial stopping boss of the duplicate gear is coaxial with the first gear shaft and is in clearance fit with the upper end face of the first duplicate gear;

a plurality of stop boss reinforcing ribs;

4. The electronic parking actuator with the noise reduction structure according to claim 1, wherein the planet carrier comprises an output spline, a planet shaft, a planet carrier base and a planet carrier central positioning hole, the planet carrier base is disc-shaped, the planet shaft is press-fitted or injection-molded on the planet carrier base, the annular groove is formed in the planet carrier base around the planet shaft, the plurality of planet gears rotate around the plurality of planet shafts respectively, and the planet carrier base is made of metal or plastic.

5. The electronic parking actuator with the noise reduction structure as claimed in claim 1, wherein the number of the claws outside the ring gear is not less than three.

6. The electronic parking actuator with the noise reduction structure as claimed in claim 2, wherein an annular gasket made of rubber or plastic is installed between the inner wall of the housing and the neck of the motor.

7. The electronic parking actuator with the noise reduction structure as claimed in claim 2, wherein a positioning boss is provided on an inner wall of the housing for fixing the motor, and the positioning boss is provided with a fool-proof structure.

8. The electronic parking actuator with the noise reduction structure as claimed in claim 2, wherein the housing and the motor end cover are formed by ultrasonic or laser welding; the shell and the upper shell cover are welded through ultrasonic waves or laser.

9. The electronic parking actuator with a noise reduction structure as claimed in claim 1, wherein the first gearwheel is a helical gear, and the first pinion gear is a helical gear or a spur gear.

10. The electronic parking actuator with the noise reduction structure as claimed in claim 1, wherein the first dual gear is made of plastic; the second gearwheel is made of plastic, the second pinion is made of powder metallurgy or metal, and the two are integrally injected; the planetary gear is made of plastics, powder metallurgy or metal.