阅读说明：本技术 一种汽车变速器的驻车机构 (Parking mechanism of automobile transmission ) 是由 杨大学 秦伟宁 向鹏 刘纪岸 王文波 于 2019-11-06 设计创作，主要内容包括：本发明公开一种汽车变速器的驻车机构,驻车棘爪的右边设有配重,使驻车棘爪的中心G处于驻车棘爪销的右边,当回位弹簧失效后,在重心G的作用下,驻车棘爪有顺时针旋转趋势,将驻车棘爪固定在原位置,防止驻车棘爪逆时针旋转而使棘爪卡入驻车棘轮圆周上的凹形齿槽,防止车辆在行驶过程中自动驻车导致变速器抱死或者停车状态无法退出P档。(The invention discloses a parking mechanism of an automobile transmission.A balance weight is arranged on the right side of a parking pawl, so that the center G of the parking pawl is positioned on the right side of a parking pawl pin, and after a return spring fails, the parking pawl has a clockwise rotation trend under the action of the gravity center G, the parking pawl is fixed at the original position, the parking pawl is prevented from rotating anticlockwise to be clamped into a concave tooth groove on the circumference of a parking ratchet wheel, and the phenomenon that the transmission is locked or the vehicle cannot exit from a P gear in a parking state due to automatic parking in the driving process of the vehicle is prevented.)

1. A parking mechanism of an automobile transmission comprises a parking cam (2), a parking pawl (4), a parking pawl pin (6), a return spring (5), a parking ratchet wheel (7) and a ratchet wheel center (72);

the parking cam (2) is used for being sleeved on a parking push rod;

one end of the parking pawl (4) is provided with a pawl (41), the middle section of the parking pawl (4) is provided with a rotating center (44), the rotating center (44) is fixedly sleeved on a parking pawl pin (6), and the upper end of the head of the parking pawl (4) is pressed on the parking cam (2) through a return spring (5);

the parking ratchet wheel (7) is provided with a concave tooth groove (71) on the circumference and can rotate around the ratchet wheel center (72); when parking, the parking cam (2) pushes the parking pawl (4) downwards to overcome the elastic force of the return spring (5) and clamp the pawl (41) into the concave tooth groove (71);

the method is characterized in that: the other end of the parking pawl (4) is provided with a counterweight (42), and the counterweight (42) is arranged to enable the gravity center of the parking pawl (4) to be deviated to one side of the counterweight at the rotating center (44); when the return spring (5) is invalid, the parking pawl (4) is controlled by gravity to keep the upper end of the head of the pawl (4) pressed on the parking cam (2).

2. The parking mechanism of an automobile transmission according to claim 1, characterized in that: the parking pawl return spring (5) is characterized in that the upper end (52) of the parking pawl return spring is in clearance fit with the box body, and the lower end (51) elastically presses the parking pawl (4) on the parking cam (2).

3. The parking mechanism of an automobile transmission according to claim 1, characterized in that: the parking pawl and the counterweight (42) are integrally formed on the parking pawl (4).

Technical Field

The invention relates to the technical field of automobile transmissions, in particular to a parking mechanism of an automobile transmission.

Background

Disclosure of Invention

The invention discloses a parking mechanism of an automobile transmission, which prevents the locking of the transmission or the incapability of exiting P gear in a parking state caused by automatic parking in the driving process of a vehicle after a parking pawl return spring fails.

The invention discloses a parking mechanism of an automobile transmission, which comprises a parking cam, a parking pawl pin, a return spring, a parking ratchet wheel and a ratchet wheel center, wherein the parking cam is arranged at the center of the parking pawl;

the parking cam is used for being sleeved on the parking push rod;

one end of the parking pawl is a pawl, the middle section of the parking pawl is a rotation center, the rotation center is fixedly sleeved on a parking pawl pin, and the upper end of the head of the pawl is tightly pressed on a parking cam through a return spring;

the parking ratchet wheel is provided with a concave tooth socket on the circumference and can rotate around the center of the ratchet wheel; when parking, the parking cam pushes the parking pawl downwards to overcome the elastic force of the return spring and clamp the pawl into the concave tooth groove;

the other end of the parking pawl is a counterweight, and the counterweight is arranged to enable the gravity center of the parking pawl to deviate from one side of the counterweight at the rotating center; when the return spring is failed, the parking pawl is controlled to keep the upper end of the pawl head of the parking pawl pressed on the parking cam due to gravity.

Furthermore, parking pawl return spring upper end and box clearance fit, the elastic parking pawl that compresses tightly the parking cam of lower extreme.

Further, the parking pawl and the counterweight are integrally formed on the parking pawl.

The beneficial technical effects of the invention are as follows: because parking pawl right-hand member is equipped with square counter weight, makes the focus of whole parking pawl be located the right of parking pawl rotation center, after parking pawl return spring became invalid, prevented that the vehicle from leading to the derailleur locking or the parking state can't withdraw from P shelves at the automatic parking of in-process of traveling, improved the car security.

Drawings

FIG. 1 is a schematic illustration of a park mechanism for a transmission of an automobile according to the present invention;

FIG. 2 is a schematic structural view of the parking pawl of the present invention;

FIG. 3 is a schematic structural view of a parking cam according to the present invention;

FIG. 4 is a schematic view of the pawl return spring of the present invention;

FIG. 5 is a schematic structural view of a parking ratchet according to the present invention;

FIG. 6 is a schematic illustration of a parking mechanism of a prior art automotive transmission;

fig. 7 is a schematic view of a conventional parking pawl structure.

Detailed Description

Referring to fig. 1 to 5, the parking mechanism of a transmission for an automobile disclosed in the present invention includes: parking cam 2, parking pawl 4, parking pawl pin 6, return spring 5, parking ratchet 7 and ratchet center 2.

The parking cam 2 is fixedly sleeved on the parking push rod.

The parking pawl 4 has a pawl 41 at one end, a weight 42 at the other end, and a rotation center 44 at the middle. The rotation center 44 is fixedly fitted over the parking pawl pin 6 and can rotate clockwise or counterclockwise. The weight 42 is provided such that the center of gravity G of the parking pawl 4 is offset to the weight side at the rotation center 44. When the return spring 5 is disabled, the parking pawl 4 tends to rotate clockwise under the action of the center of gravity G.

The return spring 5 is sleeved on the parking pawl 6, the upper end 52 of the parking pawl return spring 5 is in clearance fit with the transmission box body, and the lower end 51 elastically presses the parking pawl 4 on the parking cam 2.

The parking ratchet wheel 7 is provided with a concave tooth groove 71 on the circumference and can rotate around the ratchet wheel center 72;

when parking, the parking cam 2 pushes the parking pawl 4 downwards to overcome the elastic force of the return spring 5 and clamp the pawl 41 into the concave tooth groove 71;

when the return spring 5 is deactivated, the parking pawl 4 is controlled by gravity to keep the upper end of the head of the pawl 4 pressed against the parking cam 2. By the arrangement, the parking pawl 4 is fixed at the original position, the pawl 41 is prevented from being clamped into the concave tooth groove 71 on the circumference of the parking ratchet wheel 7 due to the fact that the parking pawl 4 rotates anticlockwise, and the situation that the transmission is locked or the vehicle cannot exit from the P gear in a parking state due to automatic parking in the driving process of the vehicle can be prevented.