CVT transmission hydraulic shift parking system

Abstract

The present invention discloses a CVT transmission hydraulic shift parking system, comprising a parking pawl, a parking lock rod, a parking drive shaft assembly connected to the parking lock rod, a hydraulic actuator connected to the parking drive shaft assembly, and a first support seat arranged on a transmission housing, wherein the parking pawl is mounted on the first support seat via a pivot. In the CVT transmission hydraulic shift parking system of the present invention, the support seat supporting the rotational motion of the parking pawl adopts a split design, which reduces the layout space and increases the degree of freedom of different layout directions.

Description

Technical Field

[0001] The present invention belongs to the technical field of transmissions, and in particular, relates to a hydraulic shift parking system for a CVT transmission. Background Art

[0002] The parking mechanism is an important part of the automatic transmission. After the vehicle is parked, it locks the transmission gears and half-axles through the engagement of the parking ratchet and the parking pawl, thereby locking the wheels to prevent the vehicle from slipping after stopping and improving safety.

[0003] In recent years, with the development of automobile electrification, the manual wire-controlled parking mechanism used on existing vehicles cannot meet the needs of electrification, and the manual wire-controlled parking mechanism contains many parts, the structure of the manual wire-controlled parking mechanism is relatively complex, the cost is high, and it occupies a large space in the transmission housing, which is not convenient to arrange in the transmission housing. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a CVT transmission hydraulic shift parking system, the purpose of which is to achieve automatic parking and reduce the space occupied during layout.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a CVT transmission hydraulic shift parking system, including a parking pawl, a parking lock rod, a parking drive shaft assembly connected to the parking lock rod, a hydraulic actuator connected to the parking drive shaft assembly and a first support seat arranged on the transmission housing, and the parking pawl is mounted on the first support seat through a pivot.

[0006] The first support seat is mounted on the transmission housing through a first bolt.

[0007] A torsion spring for applying an elastic force to the parking pawl is arranged on the pivot, and the torsion spring is connected to the first support seat and the parking pawl.

[0008] The first support seat is provided with a slot for inserting one end of the torsion spring, and the parking pawl is provided with a mounting hole for inserting the other end of the torsion spring.

[0009] The CVT transmission hydraulic shift parking system further comprises a second support base for providing support for the parking lock rod, and the second support base is arranged on the coupler housing.

[0010] The second supporting seat is mounted on the coupler housing by means of second bolts.

[0011] The CVT transmission hydraulic shift parking system also includes a limit pin for axially limiting the parking drive shaft assembly, and the limit pin is arranged on the transmission housing.

[0012] A third bolt is arranged on the transmission housing, and the limit pin is located between the third bolt and the parking drive shaft assembly.

[0013] Two second bolts are provided.

[0014] The CVT transmission hydraulic shift parking system of the present invention has the following beneficial effects:

[0015] 1. The support seat that supports the rotation of the parking pawl adopts a split design to reduce the layout space and increase the freedom of different layout directions;

[0016] 2. The structural design of the torsion spring, parking pawl, pivot and first support seat not only limits the pivot in the axial direction, but also realizes the installation of the torsion spring, thus reducing the number of parts;

[0017] 3. The second support base is fixed to different shells to solve the layout space problem;

[0018] 4. The bolt + cylindrical pin combination realizes the axial fixation of the parking drive shaft and reduces the layout space. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] This specification includes the following drawings, which show the following contents:

[0020] Figure 1 It is a structural schematic diagram of the hydraulic shift parking system of a CVT transmission of the present invention;

[0021] Figure 2 is a schematic diagram of the arrangement of the first support seat;

[0022] Figure 3 is a schematic diagram of the torsion spring arrangement;

[0023] Figure 4 is a schematic diagram of the arrangement of the second support seat;

[0024] Figure 5 is a schematic diagram of the limit pin arrangement;

[0025] The markings in the figure are: 1. parking ratchet; 2. parking pawl; 3. second support seat; 4. parking lock rod; 5. parking drive shaft assembly; 6. hydraulic actuator; 7. third bolt; 8. limit pin; 9. parking unlock rod; 10. torsion spring; 11. pivot; 12. first support seat; 13. transmission housing; 14. first bolt; 15. coupler housing; 16. second bolt. DETAILED DESCRIPTION

[0026] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.

[0027] like Figures 1 to 5 As shown, the present invention provides a CVT transmission hydraulic shift parking system, comprising a parking ratchet 1, a parking pawl 2, a parking lock rod 4, a parking drive shaft assembly 5 connected to the parking lock rod 4, a hydraulic actuator 6 connected to the parking drive shaft assembly 5, and a first support seat 12 arranged on a transmission housing 13, and the parking pawl 2 is installed on the first support seat 12 through a pivot 11. The parking ratchet 1 and the parking drive shaft assembly 5 are rotatably arranged in the transmission housing 13, the parking pawl 2 cooperates with the parking ratchet 1, and the parking pawl 2 is used to lock the parking ratchet 1. The hydraulic actuator 6 is used to drive the parking drive shaft assembly 5 to rotate, the parking drive shaft assembly 5 drives the parking lock rod 4 to move, and the parking lock rod 4 drives the parking pawl 2 to rotate. The parking unlocking rod 9 is connected to the parking drive shaft assembly 5, and the parking unlocking rod 9 is used to drive the parking drive shaft assembly 5 to rotate.

[0028] Specifically, if Figure 1 As shown, the CVT transmission hydraulic shift parking system can work according to the command of TCU (transmission controller unit). The transmission oil provided inside the transmission is used as a medium, and the power is provided by the hydraulic actuator 6 to drive the parking drive shaft assembly 5 to reciprocate up and down, so as to achieve the displacement of the parking lock rod 4 connected to the parking drive shaft assembly 5. The parking lock rod 4 drives the parking pawl 2 to achieve engagement and separation with the parking ratchet 1, thereby achieving the switching of the transmission between the P gear and the non-P gear. When the car is powered off or the hydraulic actuator 6 fails, manual control can be achieved through the parking unlocking rod 9 to achieve the switching of the transmission between the P gear and the non-P gear, which provides for the safety and maintenance of the car.

[0029] like Figure 1 and Figure 2 As shown, the first support seat 12 is mounted on the transmission housing 13 by means of first bolts 14, two first bolts 14 are provided, and a through hole for the first bolts 14 to pass through is provided on the first support seat 12. In this embodiment, the first support seat 12 and the transmission housing 13 are fixed by bolts to ensure the strength requirement of the first support seat 12 while reducing the problem of insufficient arrangement space in the transmission housing 13, thereby maximizing the utilization of space arrangement.

[0030] like Figure 1 and Figure 3As shown, the pivot 11 is mounted on the first support seat 12, and a through hole is provided at the end of the parking pawl 2 for the pivot 11 to pass through, and the axis of the pivot 11 is perpendicular to the axis of the parking ratchet 1 in space. A torsion spring 10 for applying elastic force to the parking pawl 2 is provided on the pivot 11, and the torsion spring 10 is used to achieve the resetting of the parking pawl 2, and the torsion spring 10 is connected to the first support seat 12 and the parking pawl 2. A slot is provided on the first support seat 12 for one end of the torsion spring 10 to be embedded, and a mounting hole is provided on the parking pawl 2 for the other end of the torsion spring 10 to be embedded. The torque arm structure of the torsion spring 10 is connected to the pivot 11 through the parking pawl 2 and the first support seat 12, so as to achieve the installation of the torsion spring 10 and limit the pivot 11.

[0031] like Figure 1 and Figure 4 As shown, the CVT transmission hydraulic shift parking system of the present invention also includes a second support seat 3 for providing support for the parking lock rod 4, the parking lock rod 4 is located between the second support seat 3 and the parking pawl 2, and the second support seat 3 is arranged on the coupler housing 15, thereby reducing the design of components.

[0032] like Figure 1 and Figure 4 As shown, in this embodiment, the second support seat 3 is installed on the coupler housing 15 by means of second bolts 16, two second bolts 16 are provided, the second support seat 3 is provided with through holes for the second bolts 16 to pass through, and the coupler housing 15 is provided with threaded holes for the two second bolts 16 to be inserted into.

[0033] like Figure 1 and Figure 5 As shown, the CVT transmission hydraulic shift parking system of the present invention also includes a limit pin 8 for axially limiting the parking drive shaft assembly 5. The limit pin 8 is arranged on the transmission housing 13, and a groove for inserting the limit pin 8 is arranged on the outer circumferential surface of the parking drive shaft assembly 5.

[0034] like Figure 1 and Figure 5 As shown, in this embodiment, a third bolt 7 is provided on the transmission housing 13, a limit pin 8 is located between the third bolt 7 and the parking drive shaft assembly 5, the limit pin 8 is cylindrical, the third bolt 7 is threadedly connected to the transmission housing 13, and the third bolt 7 and the limit pin 8 are coaxially arranged.

[0035] The present invention also provides a CVT continuously variable transmission, including a CVT transmission hydraulic shift parking system of the above structure. This CVT transmission hydraulic shift parking system can maximize the use of the internal space of the transmission housing 13. At the same time, the parking mechanism is simple in technology, easy to implement, saves space, and reduces design costs. The specific structure of this CVT transmission hydraulic shift parking system can be referred to Figures 1 to 5Since the CVT continuously variable transmission of the present invention includes the CVT transmission hydraulic shift parking system in the above embodiment, it has all the advantages of the above CVT transmission hydraulic shift parking system.

[0036] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A CVT transmission hydraulic shift parking system, comprising a parking pawl, a parking lock rod, a parking drive shaft assembly connected to the parking lock rod, and a hydraulic actuator connected to the parking drive shaft assembly, characterized in that: It also includes a first support seat arranged on the transmission housing, and the parking pawl is mounted on the first support seat through a pivot; The first support seat is mounted on the transmission housing by a first bolt; A torsion spring for applying an elastic force to the parking pawl is disposed on the pivot, and the torsion spring is connected to the first support seat and the parking pawl; The first support seat is provided with a slot for inserting one end of the torsion spring, and the parking pawl is provided with a mounting hole for inserting the other end of the torsion spring; The CVT transmission hydraulic shift parking system further includes a second support seat for providing support for the parking lock rod, the second support seat is arranged on the coupler housing, and the parking lock rod is located between the second support seat and the parking pawl; The second support seat is mounted on the coupler housing by a second bolt; The CVT transmission hydraulic shift parking system also includes a limit pin for axially limiting the parking drive shaft assembly, and the limit pin is arranged on the transmission housing.

2. The CVT transmission hydraulic shift parking system according to claim 1, characterized in that: A third bolt is arranged on the transmission housing, and the limit pin is located between the third bolt and the parking drive shaft assembly.

3. The CVT transmission hydraulic shift parking system according to claim 2, characterized in that: Two second bolts are provided.

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