Automatic transmission parking mechanism and parking execution method

Abstract

The present invention discloses an automatic transmission parking mechanism and a parking execution method, including a ratchet, a pawl, a parking guide plate and a push rod assembly. The push rod assembly includes a push rod, a side plate and a shift fork shaft. The side plate is mounted on the shift fork shaft, one side of the side plate is used to receive external drive to move along the shift fork shaft, and the other side of the side plate cooperates with the push rod to drive the push rod to move axially. A cam is provided on the push rod body, and the push rod moves axially downward. The cam contacts the guide surface on the parking guide plate, and then the cam squeezes the self-locking surface of the pawl, so that the pawl teeth are parked in the ratchet. The present invention uses the automatic shift tower of the transmission itself as a drive, and the shift finger on the automatic shift tower acts on the fork frame on the parking mechanism to perform the parking action, saving an additional drive motor, making the layout space more compact and achieving lightweight.

Description

Technical Field

[0001] The invention relates to the field of automobile automatic transmissions, and in particular to an automatic transmission parking mechanism and a parking execution method. Background Art

[0002] The automobile parking mechanism of prior art is as follows Figures 1 to 4 As shown, it includes a ratchet 1, a pawl 2, a parking guide plate 3, a push rod assembly 4 and a drive motor assembly 5.

[0003] The ratchet 1 is fixedly matched on the intermediate shaft of the transmission through the ratchet center hole 11; the pawl 2 includes a rotating center hole 21, a pawl tooth 22, and a pawl self-locking surface 23, and the pawl 2 is rotatably mounted on the pawl shaft 24 of the transmission case through the rotating center hole 21; the parking guide plate 3 includes a guide surface 31, a left mounting hole 32, and a right mounting hole 33, and the parking guide plate 3 is fixedly mounted on the transmission case through the left mounting hole 32 and the right mounting hole 33; the push rod assembly 4 includes a push rod 41, a side plate 42, an upper cam 43, and a lower cam 44. 4, and the upper cam 43 contacts the guide surface 31, and the lower cam 44 contacts the pawl self-locking surface 23; the output end surface of the drive motor assembly 5 is connected to the push rod 41. When parking, the drive motor assembly 5 rotates to push the push rod 41 to move, and at the same time drives the side plate 42 to move, and the side plate 42 drives the upper cam 43 and the lower cam 44 to move. Under the action of the parking guide plate 3, the upper cam 43 makes the lower cam 44 push the pawl self-locking surface 23 on the pawl 2 to rotate around the pawl shaft 24, and finally makes the pawl teeth 22 park in the ratchet wheel 1 to complete the parking action. In this structure, the drive motor assembly 5 needs to be set separately for the entire parking mechanism, and the cost of a single motor and motor control system is relatively high; and the structure of the side plate 42 occupies a large space, and the spatial structure is not compact, resulting in a larger box design, increasing the total weight of the box, and not meeting the lightweight design. Summary of the invention

[0004] The invention discloses an automatic transmission parking mechanism, which utilizes a side plate sleeved on a shift fork shaft to drive a push rod to move axially, thereby squeezing a pawl to engage in a ratchet wheel, thereby saving space for arranging the side plate and making the transmission space structure compact.

[0005] An automatic transmission parking mechanism comprises a ratchet, a pawl, a parking guide plate and a push rod assembly;

[0006] The ratchet is used to be fixedly fitted on the intermediate shaft of the transmission through the ratchet center hole;

[0007] The tail of the ratchet is provided with a rotation center hole, the head is ratchet teeth, the top of the ratchet teeth has a self-locking surface, and the ratchet rotates around the rotation center hole;

[0008] The parking guide plate is provided with a guide surface and a mounting hole, and the parking guide plate is fixedly mounted on the transmission case through the mounting hole;

[0009] The push rod assembly includes a push rod, a side plate and a fork shaft; the side plate is mounted on the fork shaft; one side of the side plate is used to receive external drive and move along the fork shaft; the other side of the side plate cooperates with the push rod to drive the push rod to move axially; a cam is arranged on the push rod body; the push rod moves axially downward, and the cam contacts the guide surface on the parking guide plate, thereby causing the cam to squeeze the self-locking surface of the pawl, so that the pawl teeth are parked in the ratchet.

[0010] Furthermore, one side of the side plate is used to receive the automatic shift tower on the transmission to drive the transmission to move along the shift fork shaft.

[0011] Furthermore, a fork opening is formed on the fork opening frame on one side of the side plate, and the fork opening is used to receive the driving force of the shift finger of the automatic shift tower on the transmission to drive the side plate to move along the shift fork shaft.

[0012] Furthermore, a push rod matching hole is provided on the other side of the side plate, and the matching hole cooperates with the push rod matching neck to drive the push rod to move axially.

[0013] Furthermore, the rotation center hole of the pawl is rotatably mounted on the fork shaft, and shares a fork shaft with other gear shift forks on the transmission.

[0014] Furthermore, the mounting holes on the parking guide plate include a left mounting hole and a right mounting hole, and the parking guide plate is fixedly mounted on the transmission case through the left mounting hole and the right mounting hole.

[0015] Furthermore, a limiting surface is extended outwardly from one side of the side plate where the push rod matching hole is arranged, and the limiting surface abuts against the side wall of the transmission to limit the circumferential rotation of the push rod.

[0016] The parking execution method of the automatic transmission parking mechanism mentioned above is adopted. When parking, one side of the side plate is driven by the external and moves along the fork shaft; the other side of the side plate cooperates with the push rod to drive the push rod to move axially; the cam on the push rod contacts the guide surface on the parking guide plate, and then the cam squeezes the self-locking surface of the pawl, so that the pawl teeth are parked in the ratchet.

[0017] The beneficial technical effects of the present invention are:

[0018] 1) The automatic shift tower of the transmission itself is used as the drive, and the parking action is performed by the shift finger on the automatic shift tower acting on the fork frame on the parking mechanism, saving an additional drive motor;

[0019] 2) The pawl is rotatably mounted on the fork shaft through its rotating center hole, and shares a fork shaft with other gear shift forks on the transmission, thereby saving components for pawl layout, making the layout space more compact and achieving lightweight.

[0020] 3) The side plate is mounted on the fork shaft and arranged axially along the fork shaft, which makes rational use of the axial space of the transmission and makes the entire automatic transmission parking mechanism more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a parking mechanism in the prior art;

[0022] Figure 2 It is a schematic diagram of a parking ratchet pawl in the prior art;

[0023] Figure 3 It is a schematic diagram of a guide plate of a parking mechanism in the prior art;

[0024] Figure 4 It is a schematic diagram of a push rod assembly and a drive motor assembly in the prior art;

[0025] Figure 5 A schematic diagram of the parking mechanism of the automatic transmission of the present invention;

[0026] Figure 6 A schematic diagram of a parking ratchet pawl of the present invention;

[0027] Figure 7 It is a schematic diagram of a guide plate of a parking mechanism of the present invention;

[0028] Figure 8 It is a schematic diagram of a putter of the present invention;

[0029] Fig. 9 It is a schematic diagram of the push rod assembly of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] See also Figures 5 to 9 The present invention discloses an automatic transmission parking mechanism, comprising a ratchet 1, a pawl 2, a parking guide plate 3 and a push rod assembly 4.

[0032] The ratchet 1 is fixedly fitted on the intermediate shaft of the transmission through the ratchet center hole 11 .

[0033] The ratchet 2 has a rotation center hole 21 at its tail, a ratchet tooth 22 at its head, and a self-locking surface 23 at the top of the ratchet tooth. The ratchet 2 rotates around the rotation center hole 21. The rotation center hole 21 of the ratchet 2 is rotatably mounted on the fork shaft 44, and shares a fork shaft 44 with other gear forks on the transmission.

[0034] The parking guide plate 3 is provided with a guide surface 31 and mounting holes, wherein the mounting holes include a left mounting hole 32 and a right mounting hole 33 . The parking guide plate 3 is fixed to the transmission case through the left mounting hole 32 and the right mounting hole 33 .

[0035] The push rod assembly includes a push rod 41, a side plate 42 and a fork shaft 44. The side plate 41 is mounted on the fork shaft 44. A fork 451 is provided on the fork frame 45 on one side of the side plate 42. The fork 451 is used to receive the finger drive of the automatic shift tower on the transmission to drive the side plate to move along the fork shaft 44. A push rod matching hole 421 is provided on the other side of the side plate. The push rod matching hole 421 matches with the push rod matching neck 411 to drive the push rod to move axially. A limiting surface 422 extends outward from one side of the side plate where the push rod matching hole 421 is provided. The limiting surface 422 abuts against the side wall of the transmission, and is combined with the upper end 442 and the lower end 441 on the fork shaft 44 to slide and fit with the box body to limit the circumferential rotation of the push rod assembly 4 and only allow axial movement. The push rod body is provided with a cam 43. When the push rod 41 moves axially downward, the cam 43 contacts the guide surface 31 on the parking guide plate, thereby causing the cam to squeeze the pawl self-locking surface 23, causing the pawl teeth 22 to park in the ratchet wheel 1, thereby completing parking.

[0036] The parking execution method of the automatic transmission parking mechanism described above is adopted. When parking, one side of the side plate 42 is driven by an external device and moves along the fork shaft 44; the other side of the side plate 42 cooperates with the push rod to drive the push rod to move axially; the cam 43 on the push rod 41 contacts the guide surface 31 on the parking guide plate 3, and then the cam 43 squeezes the pawl self-locking surface 23, so that the pawl teeth 22 are parked in the ratchet wheel 1, and the parking is completed.

[0037] This mechanism directly uses the automatic shift tower as the drive of the parking mechanism, and there is no need to set up a separate drive motor, which can reduce costs; at the same time, the rotating center hole 21 of the pawl is set and installed on the fork shaft 44, sharing a fork shaft with other gear forks inside the transmission, saving parts and space, and conforming to lightweight design.

Claims

1. An automatic transmission parking mechanism, characterized in that: It comprises a ratchet (1), a pawl (2), a parking guide plate (3) and a push rod assembly (4); The ratchet (1) is used to be fixedly fitted on the intermediate shaft of the transmission through a ratchet center hole (11); The ratchet (2) has a rotation center hole (21) at its tail, a ratchet tooth (22) at its head, and a ratchet self-locking surface (23) at the top of the ratchet tooth. The ratchet rotates around the rotation center hole. The rotation center hole (21) of the ratchet (2) is rotatably mounted on the fork shaft (44). The parking guide plate (3) is provided with a guide surface (31) and a mounting hole, the parking guide plate (3) is fixedly mounted on the transmission case through the mounting hole, the mounting hole on the parking guide plate (3) comprises a left mounting hole (32) and a right mounting hole (33), the parking guide plate (3) is fixedly mounted on the transmission case through the left mounting hole (32) and the right mounting hole (33); The push rod assembly (4) comprises a push rod (41), a side plate (42) and a shift fork shaft (44); the side plate (42) is sleeved on the shift fork shaft (44); one side of the side plate (42) is used to receive external drive to move along the shift fork shaft (44); a fork opening (451) is formed on a fork opening frame (45) on one side of the side plate (42); the fork opening (451) is used to receive the finger drive of the automatic shift tower on the transmission to drive the side plate (42) to move along the shift fork shaft (44); the other side of the side plate (42) is provided with a push rod matching hole (421 ) cooperates with the push rod neck (411) and cooperates with the push rod to drive the push rod to move axially. A limit surface (422) extends outward from one side of the push rod matching hole (421) provided on the side plate. The limit surface (422) abuts against the side wall of the transmission to limit the circumferential rotation of the push rod (41). A cam (43) is provided on the push rod body. When the push rod (41) moves axially downward, the cam (43) contacts the guide surface (31) on the parking guide plate (3), thereby causing the cam (43) to squeeze the ratchet pawl self-locking surface (23), so that the ratchet pawl teeth (22) are parked in the ratchet wheel (1).

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