CN209925572U - Motor parking actuating mechanism - Google Patents

Abstract

The utility model discloses a motor parking actuating mechanism, which comprises a driving motor, a trapezoidal screw nut, a trapezoidal screw rod, a pawl, a parking gear, a middle rocker arm, an actuating guide rod and an actuating block, wherein the middle rocker arm comprises a short arm and a long arm which are connected through a rotating shaft and can rotate mutually; the idle end of the short arm is hinged with the side face of the trapezoidal screw rod through a waist hole, the idle end of the long arm is hinged with an actuating guide rod through the waist hole, the tail end of the actuating guide rod is connected with an actuating block, an actuating spring is sleeved on the actuating guide rod, one end of the actuating spring is fixed in the actuating block, and the other end of the actuating spring is fixed on the actuating guide rod; the lower surface of the actuating block is an inclined surface and is abutted against the upper surface of the pawl; a guide rail is additionally arranged, and the actuating block is positioned between the guide rail and the pawl and slides along the guide rail. The mechanism is additionally provided with a long and short arm middle rocker arm, and the long stroke of the long arm is realized through the tiny horizontal displacement of the trapezoidal screw rod along with the screw thread, so that the requirement of shortening the actuation response time to the maximum extent is met.

Description

Motor parking actuating mechanism

Technical Field

The utility model belongs to the technical field of motor transmission, especially a motor parking actuating mechanism.

Background

Along with the popularization of the automatic gearbox, the functional requirements on the automatic gearbox are more severe, the parking mechanism is more and more commonly applied to the automatic gearbox, and along with the development of the automobile industry, the automation degree is higher and higher, and the automatic parking becomes a trend of the development of the gearbox.

In the existing patents, for example, patent No. 201710955419.6, "a parking driving mechanism" and patent No. 201810231993.1, "a parking mechanism and an automobile", both adopt the structure of a ball screw, the transmission efficiency is improved to some extent, the former is that the ball screw directly transmits with a parking arm through a conical projection, and the latter is that the ball screw directly transmits with a pawl through a cam assembly, and the 2 modes have small stroke ratio, which results in relatively long response time; install the taper block on the lead screw for the lead screw can receive radial force to a certain extent in the course of the work, influences the ride comfort of lead screw, causes the jamming easily.

Disclosure of Invention

In order to solve the problems of the prior art, the utility model provides a motor parking actuating mechanism, realize through following technical scheme.

A motor parking actuating mechanism is positioned in a shell of a gearbox and comprises a driving motor, a trapezoidal screw nut, a trapezoidal screw rod, a pawl and a parking gear, wherein the head of the trapezoidal screw nut is connected with an output shaft of the driving motor, the tail of the trapezoidal screw nut is connected with the trapezoidal screw rod through threads, the pawl rotates around a pawl shaft, a return torsion spring is arranged on the pawl shaft, one torsion spring arm of the return torsion spring is clamped on the shell of the gearbox, and the other torsion spring arm is clamped on the pawl; the tail part of the trapezoidal screw rod is provided with a guide structure, and the guide structure is matched with a shell of the gearbox and used for limiting the trapezoidal screw rod to rotate; the middle rocker arm comprises a short arm and a long arm, and the short arm and the long arm are connected through a rotating shaft and can rotate mutually; the idle end of the short arm is hinged with the side face of the trapezoidal screw rod through a waist hole, the idle end of the long arm is hinged with the actuating guide rod through the waist hole, the tail end of the actuating guide rod is connected with the actuating block, an actuating spring is sleeved on the actuating guide rod, one end of the actuating spring is fixed in the actuating block, and the other end of the actuating spring is fixed on the actuating guide rod; the lower surface of the actuating block is an inclined surface and is abutted against the upper surface of the pawl; a guide rail is additionally arranged, and the actuating block is positioned between the guide rail and the pawl and slides along the guide rail; when the claw hook of the pawl clamps the parking gear, the return torsion spring is in a compression state, and the actuating spring is in a stretching state.

When the automobile is in a conventional non-parking state, the actuating block is driven by the actuating guide rod to leave between the guide rail and the pawl, the pawl bounces under the drive of the return torsion spring, and the claw hook of the pawl leaves the parking gear. When the automobile needs to be parked, the driving motor drives the trapezoidal screw rod nut to rotate, and the trapezoidal screw rod gradually moves horizontally towards the driving motor under the slow thrust of the threads because the guide structure prevents the trapezoidal screw rod from rotating; at the moment, under the assistance and the limiting of the waist holes in the long arm and the short arm of the middle rocker arm, the short arm drives the long arm to rotate around the rotating shaft together, the actuating guide rod is pulled to horizontally move towards the direction of the actuating block along with the rotation of the long arm, and the actuating block is quickly pressed into the space between the guide rail and the pawl due to the fact that the lower surface of the actuating block is an inclined surface, and the pawl is pressed into a tooth groove of the parking gear, so that parking is completed.

Preferably, a thrust bearing and a gasket are sleeved in the middle of the trapezoidal screw rod nut, and the thrust bearing is fixed in a shell of the gearbox. The thrust bearing and the gasket can reduce the friction loss when the trapezoidal screw nut rotates.

Preferably, the guide structure is: and the guide pin is vertically inserted into the tail part of the trapezoidal screw rod and wedged into the shell of the gearbox. The guide pin is wedged in the shell and used for preventing the trapezoidal screw rod from rotating.

Preferably, the guide structure is: the tail section of the trapezoidal screw rod is semicircular, and the tail of the trapezoidal screw rod is inserted into the shell of the gearbox. This purpose is also used to prevent rotation of the trapezoidal screw.

Preferably, the actuating block is frustum-shaped, and the guide rail surface of the guide rail is matched with the actuating block.

Preferably, the actuating block is provided with a slot, the actuating guide rod is inserted into the slot, a limiting part is arranged in the slot, and the actuating spring is accommodated in the slot and abuts against the limiting part.

Preferably, a shaft shoulder is arranged at one end, close to the transmission housing, of the trapezoidal screw rod and abuts against the inner wall of the transmission housing. This structure can further fix the position of trapezoidal lead screw.

Preferably, the upper surface of the pawl is provided with a limiting block, and when the parking gear is clamped by the claw hook of the pawl, the tail end of the actuating block just contacts with the limiting block.

Preferably, an angle sensor is further arranged at the rotating shaft of the middle rocker arm. The angle sensor can adopt a sensor which is common in the market and can accurately monitor the rotating angle of the middle rocker arm, such as a Hall angle sensor and the like, so as to indirectly actuate the moving displacement of parts such as a guide rod and the like and the distance between an actuating block and a pawl.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the long arm and the short arm intermediate rocker arms are added, the long arm is longer in stroke through the tiny horizontal displacement of the trapezoidal screw rod along with the screw thread, the requirement of shortening the actuating response time to the maximum extent is met, the actuating mechanism is divided into two parts, the stress of the actuating block and the trapezoidal screw rod are decoupled, the running smoothness of the trapezoidal screw rod is guaranteed, the spatial arrangement is more flexible, and all functions of the parking driving system are integrated;

2. the parking driving force is transmitted by using a trapezoidal screw rod mechanism, so that self locking and positioning are realized;

3. and the space is compact, and the cost is reduced.

Drawings

FIG. 1 is a schematic structural diagram of a motor parking actuator according to embodiment 1;

in the figure: 1. a drive motor; 2. a trapezoidal lead screw nut; 3. a trapezoidal screw rod; 4. a pawl; 5. a parking gear; 6. a guide pin; 7. a pawl shaft; 8. a return torsion spring; 9. a middle rocker arm; 901. a short arm; 902. a long arm; 10. actuating the guide rod; 11. an actuating block; 12. an actuating spring; 13. a guide rail.

Detailed Description

The technical solutions of the embodiments in this patent will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments, not all embodiments, of this patent. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the patent without making creative efforts, shall fall within the protection scope of the patent.

In the description of this patent, it is noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the patent and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the patent. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of this patent, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. It is to be noted that all the figures are exemplary representations. The meaning of the above terms in this patent may be specifically understood by those of ordinary skill in the art.

The patent is described in further detail below with reference to specific embodiments and with reference to the attached drawings.

Example 1

As shown in fig. 1, the motor parking actuator provided in this embodiment is located in a housing of a transmission case, and includes a driving motor 1, a trapezoidal lead screw nut 2, a trapezoidal lead screw 3, a pawl 4, and a parking gear 5, where a head of the trapezoidal lead screw nut 2 is connected to an output shaft of the driving motor 1, a tail of the trapezoidal lead screw nut 2 is connected to the trapezoidal lead screw 3 through a thread, a tail of the trapezoidal lead screw 3 is provided with a guide pin 6, the guide pin 6 is vertically inserted into the tail of the trapezoidal lead screw 3, the guide pin is wedged into the housing of the transmission case, the pawl 4 rotates around a pawl shaft 7, the pawl shaft 7 is provided with a return torsion spring 8, one torsion spring arm of the return torsion spring 8 is clamped on the housing of the transmission case, and the other torsion spring arm is clamped on the;

the device further comprises a middle rocker arm 9, an actuating guide rod 10 and an actuating block 11, wherein the middle rocker arm 9 comprises a short arm 901 and a long arm 902, and the short arm 901 and the long arm 902 are connected through a rotating shaft and can rotate mutually; the idle end of the short arm 901 is hinged with the side surface of the trapezoidal screw rod 3 through a waist hole, the idle end of the long arm 902 is hinged with the actuating guide rod 10 through a waist hole, the tail end of the actuating guide rod 10 is connected with the actuating block 11, the actuating guide rod 10 is sleeved with an actuating spring 12, one end of the actuating spring 12 is fixed in the actuating block 11, and the other end of the actuating spring is fixed on the actuating guide rod; the lower surface of the actuating block 11 is an inclined surface and is abutted against the upper surface of the pawl 4; a guide rail 13 is additionally arranged, and the actuating block 11 is positioned between the guide rail 13 and the pawl 4 and slides along the guide rail 13;

when the parking gear 5 is clamped by the claw hook of the pawl 4, the return torsion spring 8 is in a compression state, and the actuating spring 12 is in a stretching state.

The above embodiments describe the implementation of the present invention in detail, however, the present invention is not limited to the specific details of the above embodiments. Within the scope of the claims and the technical idea of the present invention, various simple modifications and changes can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

Claims (9)

1. A motor parking actuating mechanism is positioned in a shell of a gearbox and comprises a driving motor, a trapezoidal screw nut, a trapezoidal screw rod, a pawl and a parking gear, wherein the head of the trapezoidal screw nut is connected with an output shaft of the driving motor, the tail of the trapezoidal screw nut is connected with the trapezoidal screw rod through threads, the pawl rotates around a pawl shaft, and a return torsion spring is arranged on the pawl shaft; one torsion spring arm of the return torsion spring is clamped on the shell of the gearbox, and the other torsion spring arm of the return torsion spring is clamped on the pawl;

the transmission mechanism is characterized in that a guide structure is arranged at the tail of the trapezoidal screw rod, and the guide structure is matched with a shell of the transmission case to limit the trapezoidal screw rod to rotate; the middle rocker arm comprises a short arm and a long arm, and the short arm and the long arm are connected through a rotating shaft and can rotate mutually; the idle end of the short arm is hinged with the side face of the trapezoidal screw rod through a waist hole, the idle end of the long arm is hinged with the actuating guide rod through the waist hole, the tail end of the actuating guide rod is connected with the actuating block, an actuating spring is sleeved on the actuating guide rod, one end of the actuating spring is fixed in the actuating block, and the other end of the actuating spring is fixed on the actuating guide rod; the lower surface of the actuating block is an inclined surface and is abutted against the upper surface of the pawl; a guide rail is additionally arranged, and the actuating block is positioned between the guide rail and the pawl and slides along the guide rail;

when the claw hook of the pawl clamps the parking gear, the return torsion spring is in a compression state, and the actuating spring is in a stretching state.

2. The motor parking actuator according to claim 1, wherein a thrust bearing and a gasket are sleeved at the middle part of the trapezoidal screw nut, and the thrust bearing is fixed in a shell of the gearbox.

3. The electric motor parking actuator of claim 1, wherein the guide structure is: and the guide pin is vertically inserted into the tail part of the trapezoidal screw rod and wedged into the shell of the gearbox.

4. The electric motor parking actuator of claim 1, wherein the guide structure is: the tail section of the trapezoidal screw rod is semicircular, and the tail of the trapezoidal screw rod is inserted into the shell of the gearbox.

5. The electric motor parking actuator of claim 1 wherein the actuator block is frustoconical and the guide surface of the guide rail engages the actuator block.

6. The electric motor parking actuator of claim 1, wherein the actuator block is provided with a slot hole, the actuator guide is inserted into the slot hole, a limit portion is provided in the slot hole, and the actuator spring is received in the slot hole and abuts against the limit portion.

7. The electric motor parking actuator of claim 1 wherein an end of the acme proximate the transmission housing is provided with a shoulder that abuts an inner wall of the transmission housing.

8. The motor parking actuator according to claim 1, wherein a limiting block is arranged on the upper surface of the pawl, and when the parking gear is clamped by the claw hook of the pawl, the tail end of the actuating block just contacts with the limiting block.

9. The electric motor parking actuator of claim 1, wherein an angle sensor is further disposed at a rotating shaft of the intermediate rocker arm.

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