Hydraulic shift fork assembly and shift actuator of dual-clutch transmission

Abstract

The hydraulic shift fork assembly includes: a hydraulic chamber housing (10) having a partition (14) and two hydraulic chambers (11, 12); two pistons (20); and two shift forks (40) respectively connected to the two pistons (20). The two hydraulic chambers (11, 12) include a first chamber (11A) and a second chamber (12A), and the hydraulic chamber housing (10) includes a first inlet / outlet port (11H) communicating with the first chamber (11A) and a second inlet / outlet port (12H) communicating with the second chamber (12A). The partition (14) is tilted, bent, or flexed. A shift actuator for a dual-clutch transmission is also provided.

Description

Technical Field

[0001] This application relates to automotive parts, and more particularly to a hydraulic shift fork assembly and a shift actuator for a dual-clutch transmission. Background Technology

[0002] CN105443745A discloses a shift actuator for a dual-clutch transmission, which includes a connecting plate, a shift fork shaft, and at least two shift fork assemblies. The at least two shift fork assemblies are mounted on the same shift fork shaft, and each shift fork assembly is driven by a hydraulic cylinder disposed on the connecting plate.

[0003] In CN105443745A, two hydraulic cylinders arranged side by side drive two shift fork assemblies respectively. The product has many parts and the structure is not compact enough.

[0004] CN105443746A (see also US20170248231A1) discloses a shift actuator for a dual-clutch transmission, comprising a front housing, a rear housing, at least two hydraulic cylinders, and at least one connecting sleeve. The at least two hydraulic cylinders are mounted on the same straight line, with their front and rear ends clamped between the front and rear housings. Each hydraulic cylinder is equipped with a shift fork assembly, a shift fork positioning seat, and two piston rings. The two piston rings are mounted inside the hydraulic cylinder and are respectively disposed near both ends of the hydraulic cylinder. The shift fork positioning seat is mounted inside the hydraulic cylinder and located between the two piston rings. The shift fork assembly includes a shift fork and a positioning plate. The positioning plate extends from outside the hydraulic cylinder and into the hydraulic cylinder, and is located between the two piston rings and forms a stop positioning engagement with the shift fork positioning seat. Each pair of adjacent hydraulic cylinders are connected together by a connecting sleeve. A first hydraulic chamber is formed between the piston ring of each hydraulic cylinder near the connecting sleeve and the connecting sleeve. The connecting sleeve is provided with a first oil passage communicating with the first hydraulic chamber. A second hydraulic chamber is formed between the piston ring of the hydraulic cylinder connected to the front housing near the front housing and the front housing. The front housing is provided with a second oil passage communicating with the second hydraulic chamber. A third hydraulic chamber is formed between the piston ring of the hydraulic cylinder connected to the rear housing near the rear housing and the rear housing. The rear housing is provided with a third oil passage communicating with the third hydraulic chamber.

[0005] In CN105443746A, two hydraulic cylinders are connected in a straight line by a front housing, a rear housing, and a connecting sleeve to drive two shift fork assemblies. It has many parts and a complex structure. Summary of the Invention

[0006] The purpose of this application is to overcome or at least mitigate the shortcomings of the prior art and to provide a compact hydraulic shift fork assembly and a shifting actuator for a dual-clutch transmission.

[0007] A hydraulic shift fork assembly is provided, comprising:

[0008] A hydraulic chamber housing having a partition for isolating the hydraulic chamber and a first inlet / outlet and a second inlet / outlet located on both sides of the partition;

[0009] Two pistons, disposed within the hydraulic chamber housing and respectively located on either side of the partition; and

[0010] The two shift forks are driven by the two pistons respectively.

[0011] The partition is inclined, bent, or flexed such that the axial distance between the farthest ends of the first and second oil inlet / outlet holes in the hydraulic chamber housing is less than the sum of the axial lengths of the first and second oil inlet / outlet holes and the minimum wall thickness of the partition.

[0012] In at least one embodiment, the first inlet / outlet and the second inlet / outlet overlap at least partially in the axial direction of the hydraulic chamber housing.

[0013] In at least one embodiment, the hydraulic chamber housing is generally cylindrical, and the first and second oil inlet / outlet holes are arranged circumferentially offset from each other in the hydraulic chamber housing.

[0014] In at least one embodiment, the partition is stepped, and the partition includes a base, a step, and a connecting portion connecting the base and the step, wherein the base and the step are offset from each other in the axial direction.

[0015] In at least one embodiment, the base and the step are flat plates perpendicular to the axis.

[0016] In at least one embodiment, the first oil inlet / outlet hole and the second oil inlet / outlet hole are respectively at least partially housed within the two C-shaped portions of the S-shaped partition.

[0017] In at least one embodiment, the partition is flat and is inclined relative to the axial direction of the hydraulic chamber housing.

[0018] In at least one embodiment, the partition is characterized in that it is a plate of uniform thickness.

[0019] In at least one embodiment, the piston includes a sealing member disposed at its axial end, the partition forming an axial stop portion of the piston.

[0020] In at least one embodiment, the hydraulic chamber housing is an integral part formed by injection molding or die casting.

[0021] In at least one embodiment, the peripheral wall of the hydraulic chamber housing is provided with two hydraulic chamber finger holes.

[0022] Each of the shift forks includes a shift finger and two fork feet connected to the shift finger, wherein the two shift fingers pass through the two hydraulic chamber shift finger holes and are connected to the two pistons.

[0023] In at least one embodiment, when the piston moves axially, the finger does not contact the wall of the finger hole in the hydraulic chamber.

[0024] In at least one embodiment, the hydraulic shift fork assembly further includes a shift fork shaft, and the two shift forks are axially slidably sleeved on the shift fork shaft.

[0025] The hydraulic chamber housing also includes two spring positioning seats that extend radially from both axial ends of the hydraulic chamber housing, and the spring positioning seats are fixed to the shift fork shaft.

[0026] A shift actuator for a dual-clutch transmission is also provided, which includes a hydraulic shift fork assembly according to this application. Attached Figure Description

[0027] Figure 1 This is a cross-sectional schematic diagram of a possible hydraulic shift fork assembly.

[0028] Figure 2 This is a cross-sectional schematic diagram of a hydraulic shift fork assembly according to one embodiment of this application.

[0029] Figure 3A yes Figure 1 A magnified view of a portion of the image. Figure 3B yes Figure 2 A magnified view of a portion of the image.

[0030] Figure 4 This is a perspective view of a hydraulic shift fork assembly according to one embodiment of this application.

[0031] Figure 5 This is a structural schematic diagram of the area near the partition of the hydraulic chamber housing of a hydraulic shift fork assembly according to another embodiment of this application.

[0032] Figure 6A and Figure 6B This is a structural schematic diagram of the area near the partition of the hydraulic chamber housing of a hydraulic shift fork assembly according to another embodiment of this application, wherein the cross-sectional lines of the partition are not shown.

[0033] Figure 7 This is a structural schematic diagram of the area near the partition of the hydraulic chamber housing of a hydraulic shift fork assembly according to another embodiment of this application. Detailed Implementation

[0034] Exemplary embodiments of this application are described below with reference to the accompanying drawings.

[0035] like Figure 1 As shown, in one possible hydraulic shift fork assembly, a hydraulic chamber housing 10 is used. Each of the two hydraulic chambers 11 and 12 of this housing 10 contains a piston 20. The shift fingers 41 of the two shift forks 40 pass through the shift finger holes 13 of the hydraulic chambers and extend into the piston grooves of the pistons 20 within the hydraulic chambers 11 and 12. The shift forks 40 are driven by hydraulically operated pistons 20 to perform shifting operations.

[0036] Each shift finger 41 and the sealing member 30 (usually also referred to as an oil seal) at both ends of each piston 20 needs to be provided with two shift strokes, left and right, and the strokes cannot overlap. More specifically, the range of movement of the shift finger 41 cannot exceed the axial extension range of the hydraulic chamber shift finger hole 13, and the sealing member 30 cannot move into the hydraulic chamber shift finger hole 13.

[0037] A partition 14 is provided between the two hydraulic chambers 11 and 12, and oil inlet and outlet ports 11H and 12H are provided on both sides of the partition 14. The partition 14 is flat. The oil inlet and outlet ports 11H and 12H do not overlap with the stroke of the piston 20.

[0038] The above solution may have the following problems.

[0039] (i) The stroke of the shift finger 41 and the sealing member 30, as well as the setting of the oil inlet and outlet holes 11H, 12H and the partition 14, result in a long axial length of the hydraulic chamber housing 10, which is not conducive to the compact arrangement of the hydraulic shift fork assembly and the shifting actuator of the dual-clutch transmission.

[0040] (ii) When the piston 20 is pressed into the hydraulic chambers 11 and 12 near the partition 14, there is no stop. During assembly and use, there is a risk that the oil inlet and outlet holes 11H and 12H may scratch the sealing components 30.

[0041] In view of the above problems, the following implementation method is further proposed.

[0042] It should be understood that, although the above describes Figure 1 While the hydraulic shift fork assembly shown has some drawbacks, it remains novel and advantageous in at least some aspects or features compared to some existing technologies. Figure 1 The above description still constitutes part of the innovative implementation scheme of this application.

[0043] (First Implementation)

[0044] Reference Figure 2 and Figure 4 The following describes a hydraulic shift fork assembly according to one embodiment of this application.

[0045] The hydraulic shift fork assembly may include a hydraulic chamber housing 10, two pistons 20, and two shift forks 40. The hydraulic chamber housing 10 may be generally cylindrical, and in particular, formed as a straight cylinder. Furthermore, the hydraulic chamber housing 10 has a partition 14 for isolating the hydraulic chambers, and more specifically, the partition 14 defines two hydraulic chambers 11 and 12 within the hydraulic chamber housing 10.

[0046] Two pistons 20 are disposed in the hydraulic chamber housing 10 and located on both sides of the partition 14. More specifically, the two pistons 20 are disposed in the two hydraulic chambers 11 and 12 respectively.

[0047] The two forks 40 are connected to the two pistons 20 respectively and are driven by the two pistons 20 respectively.

[0048] As an example, the hydraulic chamber housing 10 may include two hydraulic chamber finger holes 13 formed on the peripheral wall of the housing 10 in two hydraulic chambers 11 and 12, respectively. Each shift fork 40 may include a shift finger 41 and two fork legs 43 connected to the shift finger 41, wherein the two shift fingers 41 may be connected to, and in particular fixedly connected to, the two pistons 20 through the two hydraulic chamber finger holes 13, respectively.

[0049] Reference Figure 2 and Figure 3B The two hydraulic chambers 11 and 12 may include one of the two pistons 20 ( Figure 2 The first chamber 11A between the piston 20 on the left and the partition 14 and another piston 20 formed in the two pistons 20 ( Figure 2 The second chamber 12A between the piston 20 on the right side and the partition 14, the hydraulic chamber housing 10 may include a first inlet / outlet port 11H communicating with the first chamber 11A and a second inlet / outlet port 12H communicating with the second chamber 12A.

[0050] Reference Figure 2 and Figure 3B The partition 14 can be bent so that the first oil inlet / outlet hole 11H and the second oil inlet / outlet hole 12H overlap with the partition 14 in the axial direction A of the hydraulic chamber housing 10.

[0051] Here, the axial distance between the farthest ends of the first oil inlet / outlet hole 11H and the second oil inlet / outlet hole 12H on the axial direction A of the hydraulic chamber housing 10 can be less than the sum of the axial length of the first oil inlet / outlet hole 11H, the axial length of the second oil inlet / outlet hole 12H, and the minimum wall thickness of the partition 14.

[0052] Here, the first oil inlet / outlet hole 11H and the second oil inlet / outlet hole 12H can be made to at least partially overlap in the axial direction A of the hydraulic chamber housing 10.

[0053] Specifically, in this embodiment, the partition 14 may be stepped, and the partition 14 may include a base 141, a step 142, and a connecting portion 143 connecting the base 141 and the step 142. Along the axial direction A of the hydraulic chamber housing 10, the base 141 is positioned axially closer to the step 142 than the step 142. Figure 2 (Left side of the partition 14), in other words, the base 141 and the step 142 are at least partially offset in the axial direction A. The first oil inlet / outlet hole 11H and the second oil inlet / outlet hole 12H are located on both sides of the partition 14, arranged adjacent to the partition 14, and preferably, the first oil inlet / outlet hole 11H and the second oil inlet / outlet hole 12H overlap with the partition 14 in the axial direction A.

[0054] Here, the overlap of the first oil inlet / outlet hole 11H and the second oil inlet / outlet hole 12H with the partition 14 in the axial direction A includes the case where, within the hydraulic chamber housing 10, the first oil inlet / outlet hole 11H partially overlaps with the partition 14 and / or the second oil inlet / outlet hole 12H partially overlaps with the partition 14.

[0055] Here, the overlap of the first inlet / outlet port 11H and the second inlet / outlet port 12H with the partition 14 in the axial direction A can mean that, within the hydraulic chamber housing 10, the first inlet / outlet port 11H and the second inlet / outlet port 12H with the partition 14 occupy the same axial section of the hydraulic chamber housing 10. Alternatively, it can be described as, when viewed along at least one radial direction of the hydraulic chamber housing 10 (e.g., along...). Figure 2 and Figure 3B (Observed from the top and bottom) The first oil inlet / outlet hole 11H and the second oil inlet / outlet hole 12H overlap or block the partition 14.

[0056] Reference Figure 3B and Figure 4 The first oil inlet / outlet hole 11H and the second oil inlet / outlet hole 12H can be arranged staggered in the circumferential direction of the hydraulic chamber housing 10, which facilitates cooperation with the bent partition 14 and reduces the axial space occupied by the partition 14 and the oil inlet / outlet holes 11H and 12H.

[0057] Comparison Figure 3A and Figure 3B ,exist Figure 3A In the scheme shown, the partition 14 is flat, and the first oil inlet / outlet hole 11H and the second oil inlet / outlet hole 12H are located on both sides of the partition 14 along the axis. The axial length L1 occupied by the oil inlet / outlet hole and the partition 14 is approximately the sum of the diameters of the two oil inlet / outlet holes plus the wall thickness of the partition 14.

[0058] exist Figure 3BIn this configuration, the first oil inlet / outlet hole 11H and the second oil inlet / outlet hole 12H overlap with the partition 14 in the axial direction A. Specifically, the first oil inlet / outlet hole 11H and the second oil inlet / outlet hole 12H completely overlap with the partition 14 in the axial direction A; that is, the first oil inlet / outlet hole 11H does not extend beyond the base 141 of the partition 14 on one axial side, and the second oil inlet / outlet hole 12H does not extend beyond the step 142 of the partition 14 on the other axial side. Thus, the axial length L2 occupied by the oil inlet / outlet holes and the partition 14 is approximately equal to the diameter of one oil inlet / outlet hole plus the wall thickness of the partition 14.

[0059] Clearly, L2 is less than L1. Figure 3B The proposed solution reduces the axial length of the hydraulic shift fork assembly, making the hydraulic shift fork assembly structure more compact.

[0060] Optionally, the base 141 and the step 142 can be flat plates perpendicular to the axis A.

[0061] Here, preferably, the partition 14 can be a plate of uniform thickness.

[0062] The connecting part 143 can smoothly connect the base 141 and the step 142.

[0063] In this way, the partition 14 has a simple structure, is easy to manufacture, and is less prone to stress concentration.

[0064] Reference Figure 2 and Figure 3B The piston 20 may include a sealing member 30 disposed at its axial end, and the partition 14 may form an axial stop portion of the piston 20, so that when the piston 20 abuts against the partition 14, more specifically, against the base 141 or the step 142, the sealing member 30 and the first inlet / outlet port 11H and the second inlet / outlet port 12H (more specifically, the openings formed by the first inlet / outlet port 11H and the second inlet / outlet port 12H on the inner circumferential surface of the hydraulic chamber housing 10) do not overlap in the axial direction A.

[0065] In this way, the piston 20 can be axially stopped by the partition 14, preventing the oil inlet and outlet holes from scratching the sealing component 30.

[0066] Here, the hydraulic chamber housing 10 can be a single piece formed by injection molding or die casting. For example, the hydraulic chamber housing 10 can be injection molded from engineering plastics, or it can be die cast from a metal such as aluminum.

[0067] The hydraulic chamber housing 10 is a single piece, reducing the number of parts and the assembly work of multiple parts, and facilitating the sealing of the hydraulic chamber. Injection molding or die casting can be used to integrally form the hydraulic chamber housing 10 at low cost.

[0068] It is understood that the formation of the hydraulic cavity housing 10 by injection molding or die casting does not preclude possible or necessary subsequent processing, such as possible or necessary machining of the aluminum hydraulic cavity housing 10.

[0069] Here, when the piston 20 moves axially, the shift finger 41 does not need to contact the wall of the hydraulic chamber shift finger hole 13. This avoids the shift finger 41 impacting the wall of the hydraulic chamber shift finger hole 13, which can avoid or reduce deformation or damage to the hydraulic chamber housing 10, ensure sealing, and reduce fluid (e.g., hydraulic oil) leakage.

[0070] Reference Figure 2 and Figure 4 The hydraulic shift fork assembly may also include a shift fork shaft 60, and two shift forks 40 may be axially slidably sleeved on the shift fork shaft 60.

[0071] The hydraulic chamber housing 10 may also include two spring positioning seats 15 extending radially from both axial ends of the hydraulic chamber housing 10, and the spring positioning seats 15 may be fixed to the shift fork shaft 60. In this way, the positioning of the hydraulic chamber housing 10 relative to the shift fork shaft 60 can be easily achieved, for example, preventing the hydraulic chamber housing 10 from rotating relative to the shift fork shaft 60.

[0072] Reference Figure 4 The hydraulic shift fork assembly may also include a position sensor for determining the position of the shift fork 40. The position sensor may be a magnetic sensor, a portion 51 of which may be mounted to the connection portion 44 of the two fork legs 43, and another portion 52 of which may be mounted to the hydraulic chamber housing 10 or other suitable location of the shift actuator or dual-clutch transmission that includes the hydraulic shift fork assembly, for example, a location fixed relative to the housing of the dual-clutch transmission.

[0073] Reference Figure 4 The shift fork 40 may include: a sleeve 42 formed at the connecting portion 44; two fork legs 43 extending from the connecting portion 44; and a shift finger 41 extending from the connecting portion 44 away from the two fork legs 43.

[0074] Reference Figure 4 The hydraulic shift fork assembly may also include a first oil pipe joint 11J connected to the first oil inlet / outlet port 11H and a second oil pipe joint 12J connected to the second oil inlet / outlet port 12H. The first oil pipe joint 11J and the second oil pipe joint 12J may be connected to oil pipes for supplying oil to the first chamber 11A and the second chamber 12A and for draining oil from the first chamber 11A and the second chamber 12A.

[0075] Here, the first oil pipe joint 11J and the second oil pipe joint 12J can be integrally formed with the main body (straight pipe section) of the hydraulic chamber housing 10.

[0076] Reference Figure 2 The hydraulic chamber 11 may further include a third chamber 11B formed on one axial side of one of the two pistons 20, and the hydraulic chamber 12 may further include a fourth chamber 12B formed on the other axial side of the other piston 20.

[0077] When oil is supplied to the first chamber 11A or the third chamber 11B, a piston 20 can be moved axially, thereby driving a shift fork 40. Figure 2 The shift fork 40 on the left side moves axially, and the fork foot 43 of the shift fork 40 can push the synchronizer to achieve the shifting operation.

[0078] Similarly, when oil is supplied to the second chamber 12A or the fourth chamber 12B, another piston 20 can be moved axially, thereby driving another shift fork 40. Figure 2 The shift fork 40 on the right side moves axially, and the fork foot 43 of the other shift fork 40 can push the synchronizer to achieve the shifting operation.

[0079] Here, this embodiment also provides a shift actuator for a dual-clutch transmission, which includes the hydraulic shift fork assembly of this application.

[0080] It is understood that, in addition to the hydraulic shift fork assembly shown in the attached figures and described herein, the shift actuator may also include other components or structures such as oil pipes and oil pumps.

[0081] (Second Implementation)

[0082] Reference Figure 5 It shows the structure near the partition 14 of the hydraulic chamber housing 10 of a hydraulic shift fork assembly according to another embodiment of this application.

[0083] Here, the partition 14 is curved. As an example, the partition 14 can be S-shaped, and the first inlet / outlet port 11H and the second inlet / outlet port 12H can overlap with the partition 14 in the axial direction A of the hydraulic chamber housing 10. It can be understood that the S-shape here refers to the S-shape viewed from a radial direction, and the partition 14 can also be referred to as wavy.

[0084] Here, the first oil inlet / outlet hole 11H and the second oil inlet / outlet hole 12H can be at least partially housed in the two C-shaped portions 148 and 149 of the S-shaped partition 14.

[0085] It is understood that the S-shape or C-shape here does not have to be strictly S-shape or C-shape, but only roughly S-shape or C-shape. For example, the bottom (or protrusion) of the two C-shaped parts 148 and 149 may include a flat part so that there is more contact area with the piston 20 when stopping the piston 20.

[0086] Understandable, Figure 3B and Figure 5 In the scheme shown, the two oil inlet and outlet holes can partially or completely overlap in the axial direction A, or be completely offset.

[0087] Understandable. Figure 5 This diagram is for illustrative purposes only, showing the shape of the partition 14 and its positional relationship to the first oil inlet / outlet port 11H and the second oil inlet / outlet port 12H. The structure and corresponding dimensions can be appropriately designed and modified. For example, the partition 14 can be positioned closer to the first oil inlet / outlet port 11H and the second oil inlet / outlet port 12H.

[0088] (Third Implementation)

[0089] Reference Figure 6A and Figure 6B It shows the structure near the partition 14 of the hydraulic chamber housing 10 of a hydraulic shift fork assembly according to another embodiment of the present application.

[0090] Here, the partition 14 is flat and inclined relative to the axial direction A of the hydraulic chamber housing 10. The first inlet / outlet port 11H and the second inlet / outlet port 12H are located at both ends of the partition 14 on a radial direction R. Figure 6A and Figure 6B The two ends of the middle are arranged adjacent to each other.

[0091] exist Figure 6A When viewed along a direction perpendicular to the radial direction R, the partition 14 and the oil inlet / outlet holes 11H and 12H form a "%" shape.

[0092] exist Figure 6B In the hydraulic chamber housing 10, the two oil inlet and outlet holes 11H and 12H are offset by 180 degrees in the circumferential direction, so that the space formed by the inclined partition 14 can be fully utilized.

[0093] (Fourth Implementation)

[0094] Reference Figure 7 It shows the structure near the partition 14 of the hydraulic chamber housing 10 of a hydraulic shift fork assembly according to another embodiment of the present application.

[0095] This implementation method can be considered as Figure 3B Variations of the illustrated embodiments.

[0096] In an alternative configuration, the two oil inlet and outlet ports 11H and 12H are offset by 180 degrees in the circumferential direction of the hydraulic chamber housing 10.

[0097] In another alternative, the oil inlet and outlet holes shown by the dashed circle can be used instead. Figure 7 The second oil inlet / outlet hole 12H is located on the upper middle side.

[0098] In another alternative, multiple inlet and outlet ports, for example two, can be provided for the hydraulic chambers 11 and 12.

[0099] Of course, this application is not limited to the above-described embodiments. Those skilled in the art can make various modifications to the above-described embodiments of this application under the guidance of this application, without departing from the scope of this application. Here, the following supplementary explanation is provided.

[0100] (i) The cross-section of part or all of the oil inlet and outlet holes 11H and 12H may not be circular, for example, it may be elliptical.

[0101] (ii) The method of manufacturing the hydraulic cavity housing 10 is not limited to injection molding or die casting. For example, the hydraulic cavity housing 10 can also be formed by metal machining.

[0102] (iii) This application is not limited to defining two hydraulic chambers 11, 12 in the hydraulic chamber housing 10 by a partition 14. In other possible embodiments, more hydraulic chambers may be defined by multiple partitions 14, thereby operating more shift forks 40.

[0103] List of reference numerals

[0104] 10 Hydraulic chamber housing

[0105] Hydraulic chambers 11 and 12

[0106] 11A First Chamber

[0107] 12A Second Chamber

[0108] 11B Third Chamber

[0109] 12B Fourth Chamber

[0110] 11H and 12H oil inlet and outlet holes

[0111] 11J First Oil Pipe Joint

[0112] 12J Second Oil Pipe Fitting

[0113] 13 Hydraulic chamber finger hole

[0114] 14. Partition

[0115] 141 Abutment

[0116] 142 steps

[0117] 143 Connecting part

[0118] 148, 149 C-shaped parts

[0119] 15 Spring positioning seat

[0120] 20 Pistons

[0121] 30 Sealing components

[0122] 40 Shift fork

[0123] 41. Flicking fingers

[0124] 42 sleeve

[0125] 43. Forked feet

[0126] 44 Connection Part

[0127] 60 shift fork shaft

[0128] Axial

Claims

1. A hydraulic shift fork assembly, characterized in that, include: The hydraulic chamber housing (10) has a partition (14) for isolating the hydraulic chamber and a first inlet / outlet port (11H) and a second inlet / outlet port (12H) located on both sides of the partition; Two pistons (20) are disposed in the hydraulic chamber housing (10) and located on opposite sides of the partition; and The two forks (40) are driven by the two pistons (20) respectively. The partition (14) is inclined, bent or curved such that the axial distance between the farthest ends of the first oil inlet / outlet hole (11H) and the second oil inlet / outlet hole (12H) on the axial direction (A) of the hydraulic chamber housing (10) is less than the sum of the axial length of the first oil inlet / outlet hole (11H), the axial length of the second oil inlet / outlet hole (12H) and the minimum wall thickness of the partition (14).

2. The hydraulic shift fork assembly according to claim 1, characterized in that, The first inlet / outlet port (11H) and the second inlet / outlet port (12H) at least partially overlap in the axial direction (A) of the hydraulic chamber housing (10).

3. The hydraulic shift fork assembly according to claim 1, characterized in that, The hydraulic chamber housing is generally cylindrical, and the first oil inlet / outlet hole (11H) and the second oil inlet / outlet hole (12H) are arranged staggered in the circumferential direction of the hydraulic chamber housing (10).

4. The hydraulic shift fork assembly according to claim 1, characterized in that, The partition (14) is stepped and includes a base (141), a step (142) and a connecting part (143) connecting the base (141) and the step (142). The base (141) and the step (142) are offset from each other in the axial direction.

5. The hydraulic shift fork assembly according to claim 4, characterized in that, The base (141) and the step (142) are flat plates perpendicular to the axis (A).

6. The hydraulic shift fork assembly according to claim 1, characterized in that, The first oil inlet / outlet hole (11H) and the second oil inlet / outlet hole (12H) are respectively at least partially housed within the two C-shaped portions of the S-shaped partition (14).

7. The hydraulic shift fork assembly according to claim 1, characterized in that, The partition (14) is flat and is inclined relative to the hydraulic chamber housing (10) axially.

8. The hydraulic shift fork assembly according to any one of claims 1 to 7, characterized in that, The partition (14) is a plate with uniform thickness.

9. The hydraulic shift fork assembly according to any one of claims 1 to 7, characterized in that, The piston (20) includes a sealing member (30) disposed at its axial end, and the partition (14) forms an axial stop portion of the piston (20).

10. The hydraulic shift fork assembly according to any one of claims 1 to 7, characterized in that, The hydraulic chamber housing (10) is an integral part formed by injection molding or die casting.

11. The hydraulic shift fork assembly according to any one of claims 1 to 7, characterized in that, The peripheral wall of the hydraulic chamber housing (10) is provided with two hydraulic chamber finger holes (13). Each of the forks (40) includes a fork (41) and two fork legs (43) connected to the fork (41), wherein the two forks (41) pass through the two hydraulic chamber fork holes (13) and are connected to the two pistons (20).

12. The hydraulic shift fork assembly according to claim 11, characterized in that, When the piston (20) moves axially, the finger (41) does not contact the wall of the hydraulic chamber finger hole (13).

13. The hydraulic shift fork assembly according to any one of claims 1 to 7, characterized in that, The hydraulic shift fork assembly also includes a shift fork shaft (60), and the two shift forks (40) are axially slidably sleeved on the shift fork shaft (60). The hydraulic chamber housing (10) also includes two spring positioning seats (15) extending radially from both ends of the hydraulic chamber housing (10), the spring positioning seats (15) being fixed to the shift fork shaft (60).

14. A shift actuator for a dual-clutch transmission, characterized in that, The hydraulic shift fork assembly included in any one of claims 1 to 13.

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