CN214578796U

CN214578796U - Parking mechanism

Info

Publication number: CN214578796U
Application number: CN202120589742.8U
Authority: CN
Inventors: 顾振宇; 白秀超
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2021-11-02
Anticipated expiration: 2031-03-23

Abstract

The utility model discloses a parking mechanism relates to car control technical field. The parking mechanism comprises a shell, two driving motors, a transmission assembly, an output assembly and an elastic assembly. Two driving motors are arranged in the shell, and the output end of each driving motor is provided with a driving gear. The transmission assembly comprises a driven gear and a worm which are coaxially connected, and the driven gear is meshed with the two driving gears simultaneously. The output assembly comprises an output shaft and a sector worm wheel arranged on the output shaft, one end of the output shaft is connected with a parking pawl, and when the sector worm wheel is driven by a worm to be separated from the worm, the parking pawl is embedded into wheel teeth of the parking gear. When the sector worm wheel is separated from the worm, the elastic component can drive the gear teeth at the edge of the sector worm wheel to abut against the threads of the worm. The parking mechanism can enable the sector worm wheel to be separated from the worm when the parking pawl is embedded into a wheel tooth space of the parking gear so as to prevent the parking pawl from colliding with the parking gear to cause damage due to overlarge parking torque.

Description

Parking mechanism

Technical Field

The utility model relates to an automobile control technical field especially relates to a parking mechanism.

Background

With the development of the automobile industry technology, the electronic control element has a greater and greater proportion in the whole automobile due to the cost advantage and the quality advantage of the electronic control element, wherein the electronic parking system becomes an electronic control element widely applied to passenger vehicles.

The motor-driven electronic parking actuating mechanism can arrange the mechanism outside a shell of the automatic transmission, is not limited by an internal space, has the advantage of strong universality, and can be arranged on automatic transmissions of different models and different output torques. In order to ensure the reliability of the parking system, a double-motor driving scheme can be adopted, the two motors can work simultaneously when needing large torque output, the total output torque value of the actuator can be adjusted by adjusting the output torque of the two motors, and double output torque can be provided at most; in addition, when one motor fails, the other motor can still continue to work, and the working reliability of the mechanism is ensured. Although the effectiveness of the parking system is guaranteed by the excessive torque, the parking pawl is easy to collide with the parking gear due to the excessive stress, and the damage is caused.

In view of the above problems, it is desirable to develop a parking mechanism to solve the problem of damage caused by collision between a parking pawl and a parking gear due to an excessive parking torque.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a parking mechanism can make fan-shaped worm wheel and worm throw off in order to prevent that parking moment from too big messenger parking pawl and parking gear bump and causing the damage when parking pawl embedding parking gear's wheel intertooth.

To achieve the purpose, the utility model adopts the following technical proposal:

a parking mechanism comprising:

a housing;

the two driving motors are arranged in the shell, and the output end of each driving motor is provided with a driving gear;

the transmission assembly comprises a driven gear and a worm which are coaxially connected, and the driven gear is meshed with the two driving gears simultaneously;

the output assembly comprises an output shaft and a sector worm wheel arranged on the output shaft, one end of the output shaft is connected with a parking pawl, and when the sector worm wheel is driven by the worm to be separated from the worm, the parking pawl is embedded between gear teeth of the parking gear;

and the elastic assembly can drive the gear teeth at the edge of the sector worm wheel to abut against the threads of the worm when the sector worm wheel is separated from the worm.

Preferably, the arc of the worm gear sector is 70 °.

Preferably, the elastic assembly comprises two elastic members, one ends of the two elastic members are respectively connected with or abutted against two side surfaces of the sector worm wheel and are symmetrically arranged relative to the sector worm wheel, and the other ends of the two elastic members are respectively abutted against the shell.

Preferably, the elastic component comprises a torsion spring, the output shaft is sleeved with the torsion spring, one end of the torsion spring is connected to the fan-shaped worm wheel, and the other end of the torsion spring is connected to the shell.

Preferably, the driven gear and the sector worm gear are made of plastic.

Preferably, the driven gear is injection molded directly from the worm and the sector worm gear is injection molded directly from the output shaft.

Preferably, the output ends of the two driving motors are in interference fit with the driving gear.

Preferably, the worm is provided with a limiting portion, the shell is internally provided with a clamping portion, and the clamping portion axially positions the worm through the limiting portion.

Preferably, the motor drive device further comprises a circuit board and two pairs of motor terminals, each pair of motor terminals is connected with two electrodes of one drive motor in an interference fit mode, and the circuit board is connected with the motor terminals in a welding mode.

Preferably, the circuit board further comprises a plurality of input terminals, and the input terminals and the motor terminals are both injection-molded together with the housing.

The utility model has the advantages that:

the utility model provides a parking mechanism. In the parking mechanism, two driving motors are utilized to drive the sector worm wheel of the output assembly to rotate through the transmission assembly, and the parking pawl is driven to be embedded into the gear teeth of the parking gear, so that the parking gear cannot rotate to realize parking. The dual-drive motors can simultaneously work when large torque output is needed, the total output torque value of the actuator can be adjusted by adjusting the output torque of the two motors, and double output torque can be provided at most; in addition, when one motor fails, the other motor can still continue to work, and the working reliability of the mechanism is ensured. When the sector worm wheel is separated from the worm, the parking pawl is embedded into the gear teeth of the parking gear, so that the parking function is guaranteed, and the parking pawl and the parking gear cannot collide due to continuous rotation of the worm. And elastic component can drive fan-shaped worm wheel and lean on the screw thread in the worm, can drive fan-shaped worm wheel reversal when the worm reversal, realizes relieving the parking.

Drawings

Fig. 1 is a schematic structural diagram of a parking mechanism provided by the present invention;

fig. 2 is a schematic structural diagram of the parking mechanism after a driving motor is removed.

In the figure:

1. a drive motor; 2. a transmission assembly; 3. an output component; 4. a circuit board;

11. a drive gear; 12. a motor terminal; 21. a driven gear; 22. a worm; 31. an output shaft; 32. a sector worm gear; 41. an input terminal;

221. a limiting part.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

The present embodiment provides a parking mechanism. As shown in fig. 1 and 2, the parking mechanism includes a housing, two driving motors 1, a transmission assembly 2, an output assembly 3, and an elastic assembly. Two driving motors 1 are arranged in the shell, and the output end of each driving motor 1 is provided with a driving gear 11. The transmission assembly 2 comprises a driven gear 21 and a worm 22 which are coaxially connected, and the driven gear 21 is simultaneously meshed with the two driving gears 11. The output assembly 3 comprises an output shaft 31 and a sector worm wheel 32 arranged on the output shaft 31, one end of the output shaft 31 is connected with a parking pawl, and when the sector worm wheel 32 is driven by the worm 22 to be separated from the worm 22, the parking pawl is embedded into wheel teeth of the parking gear. When the worm sector wheel 32 is disengaged from the worm 22, the elastic component can drive the gear teeth on the edge of the worm sector wheel 32 to abut against the threads of the worm 22.

Two driving motors 1 make the parking mechanism can realize the regulation of executor total output torque value when the parking, the moment of output twice at most, and when a motor broke down, another motor was thrown away and can be continued work, has guaranteed the reliability of parking mechanism. The direction of force is changed through the transmission of the worm wheel and the worm 22, so that the parking mechanism is more flexible in design and arrangement, is not limited by the internal space, and has the advantage of strong universality. The sector worm wheel 32 is separated from the worm 22 after the parking pawl is embedded into a wheel tooth space of the parking gear, so that effective parking can be guaranteed, and the large driving force of the dual-drive motor 1 can be prevented from continuously acting on the parking pawl to enable the parking pawl to collide with the parking gear to cause damage. The elastic component can drive the gear teeth at the edge of the sector worm wheel 32 to abut against the threads of the worm 22 after the sector worm wheel 32 is separated from the worm 22, so that the situation that the parking state cannot be released when the worm 22 rotates reversely after the sector worm wheel 32 is separated from the worm 22 is effectively prevented, and the normal work of the parking mechanism is ensured. The two driving motors 1 can be freely selected to be positioned on the same side of the transmission gear or respectively positioned on two sides of the transmission gear according to the structure of a specific vehicle. The diameter of the driven gear 21 is larger than the diameters of the two driving gears 11, and the transmission between the driving gears 11 and the driven gear 21 and the transmission between the worm 22 and the sector worm wheel 32 are both speed reduction transmission, so that the torque output is improved, and the stability is improved.

Preferably, the arc of the segmented worm gear 32 is 70 °. The radian of the sector worm wheel 32 corresponds to the working stroke of the parking pawl, the working stroke of the parking pawl is required to be determined according to different working strokes, the sector worm wheel 32 with the radian of 70 degrees is selected for the parking mechanism, effective parking can be guaranteed, and the weight and the manufacturing cost of the sector worm wheel 32 are reduced.

Preferably, the elastic assembly includes two elastic members, one ends of the two elastic members are respectively connected to or abutted against two side surfaces of the sector worm wheel 32, and are symmetrically disposed relative to the sector worm wheel 32, and the other ends of the two elastic members are respectively abutted against the housing. The two elastic pieces can ensure that the sector worm wheel 32 and the worm 22 cannot be completely separated from each other from two directions, and the sector worm wheel 32 can be effectively driven to rotate when the worm 22 rotates reversely.

It will be appreciated that the resilient member comprises a torsion spring which is mounted on the output shaft 31 with one end of the torsion spring being connected to the worm sector gear 32 and the other end of the torsion spring being connected to the housing. The function of the torsion spring is the same as that of the two elastic pieces, and the two directions ensure that the gear teeth at the edge of the sector worm wheel 32 can be abutted against the worm 22 when the sector worm wheel is separated from the worm 22, so that the transmission effectiveness is ensured, and the situation that the parking state cannot be released because the sector worm wheel 32 is completely separated from the worm 22 is prevented.

The driven gear 21 and the sector worm gear 32 are both made of plastic. The weight of the driven gear 21 and the sector worm wheel 32 can be effectively reduced by using plastic, and the transmission efficiency of the parking mechanism is improved. Preferably, the driving gear 11 and the worm 22 are made of alloy steel material, powder metallurgy alloy steel can be adopted, and the gear pair made of plastic and alloy steel material can effectively reduce friction and improve transmission efficiency.

Preferably, the driven gear 21 is injection molded directly from the worm 22 and the sector worm gear 32 is injection molded directly from the output shaft 31. The injection structure can reduce friction in the transmission process and improve transmission efficiency.

Preferably, the output ends of the two driving motors 1 are in interference fit with the driving gear 11. The output end of the driving motor 1 is sleeved with the driving gear 11 and is in interference fit, other fixing structures are not needed, the stability of power transmission is guaranteed, and the structure is simplified.

It will be appreciated that the worm 22 is subject to the resistance provided by the worm sector 32 in the axial direction of the worm 22 during the rotation of the worm sector 32, and the worm 22 is easily moved in the axial direction. As shown in fig. 2, to solve this problem, a limiting portion 221 is disposed on the worm 22, and a clamping portion is disposed in the housing, and the clamping portion axially positions the worm 22 through the limiting portion 221, so that it can be ensured that the worm 22 only rotates and cannot axially move.

Preferably, the parking mechanism further comprises a circuit board 4 and two pairs of motor terminals 12, each pair of motor terminals 12 is connected with two electrodes of one driving motor 1 in an interference fit mode, and the circuit board 4 is connected with the motor terminals 12 in a welding mode. The motor terminal 12 is connected with the electrode of the driving motor 1 in an interference fit manner, so that the problem of power supply of the driving motor 1 caused by poor contact can be prevented, and the disassembly and maintenance are convenient. The circuit board 4 and the motor terminal 12 are not required to be disassembled, the effectiveness and the stability of connection are guaranteed through welding, the process is simple, and the structural reliability is high.

Preferably, the circuit board 4 further includes a plurality of input terminals 41, and the input terminals 41 and the motor terminals 12 are injection molded together with the housing. Utilize the shell to fix input terminal 41 and motor terminal 12, make it can not rock in the shell, lead to input terminal 41 and motor terminal 12 to produce when having effectively prevented parking mechanism to rock or slightly tremble and rock, cause the cracked problem of junction.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims

1. A parking mechanism, comprising:

a housing;

the two driving motors (1) are arranged in the shell, and the output end of each driving motor (1) is provided with a driving gear (11);

the transmission assembly (2) comprises a driven gear (21) and a worm (22) which are coaxially connected, and the driven gear (21) is meshed with the two driving gears (11) simultaneously;

the output assembly (3) comprises an output shaft (31) and a sector worm wheel (32) arranged on the output shaft (31), one end of the output shaft (31) is connected with a parking pawl, and when the sector worm wheel (32) is driven by the worm (22) to be separated from the worm (22), the parking pawl is embedded between gear teeth of the parking gear;

when the sector worm wheel (32) is separated from the worm (22), the elastic component can drive the gear teeth on the edge of the sector worm wheel (32) to abut against the threads of the worm (22).

2. Parking mechanism according to claim 1, characterized in that the arc of the sector worm wheel (32) is 70 °.

3. The parking mechanism according to claim 1, wherein the elastic component comprises two elastic members, one ends of the two elastic members are respectively connected with or abutted against two side surfaces of the sector worm wheel (32) and are symmetrically arranged relative to the sector worm wheel (32), and the other ends of the two elastic members are respectively abutted against the outer shell.

4. The parking mechanism according to claim 1, wherein the elastic component comprises a torsion spring, the torsion spring is sleeved on the output shaft (31), one end of the torsion spring is connected to the sector worm wheel (32), and the other end of the torsion spring is connected to the housing.

5. Parking mechanism according to claim 1, characterized in that the driven gear wheel (21) and the sector worm wheel (32) are made of plastic.

6. Parking mechanism according to claim 5, wherein the driven gear wheel (21) is injection moulded directly from the worm (22) and the sector worm wheel (32) is injection moulded directly from the output shaft (31).

7. Parking mechanism according to claim 1, characterized in that the output of both drive motors (1) is an interference fit with the drive gear (11).

8. The parking mechanism according to claim 1, wherein a limit portion (221) is provided on the worm (22), and a clamping portion is provided in the housing, and the clamping portion axially positions the worm (22) through the limit portion (221).

9. The parking mechanism according to claim 1, further comprising a circuit board (4) and two pairs of motor terminals (12), wherein each pair of motor terminals (12) is connected with two electrodes of one driving motor (1) in an interference fit manner, and the circuit board (4) is connected with the motor terminals (12) in a welding manner.

10. Parking mechanism according to claim 9, characterized in that the circuit board (4) further comprises a plurality of input terminals (41), the input terminals (41) and the motor terminals (12) being injection moulded together with the housing.