Hydraulic actuating mechanism for electro-hydraulic transmission

Abstract

The utility model discloses a hydraulic actuating mechanism for an electro-hydraulic transmission, and belongs to the technical field of release bearings. According to the hydraulic actuating mechanism, an integrated hydraulic release bearing is arranged on a hydraulic cylinder body, a piston is arranged between the integrated hydraulic release bearing and a high-pressure cavity in the hydraulic cylinder body, the purpose that the release bearing moves along the hydraulic actuating mechanism is achieved through the oil feeding and oil returning processes, and a displacement sensor and magnetic steel are arranged outside the hydraulic cylinder body; and the displacement sensor can measure the moving position of the integrated hydraulic release bearing through the change of the relative positions of the two. The integrated hydraulic release bearing and the hydraulic cylinder body are good in adaptability, and the installation process is simple. The executing mechanism has the advantages of being convenient to machine, easy to assemble, good in sealing performance and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of release bearings, and in particular relates to a hydraulic actuator for an electro-hydraulic transmission. Background Art

[0002] With the rapid development and adoption of automatic mechanical transmissions (AMTs) in commercial vehicles in China, the corresponding clutch release systems have gradually shifted from mechanical release systems to pneumatic and hydraulic clutch actuators. Pneumatic release systems are suitable for medium- and heavy-duty truck transmissions, while hydraulic clutch release systems are more suitable for light truck transmissions. A well-designed hydraulic system ensures smooth clutch engagement and gentle release, with precise control of the release stroke. This extends the service life of the transmission, clutch, and the entire drivetrain. The hydraulic release bearing is maintenance-free, ensuring excellent performance throughout its lifecycle. Furthermore, due to the lack of air supply in light trucks, hydraulic release systems are more suitable.

[0003] Currently, the AMTs used in domestic commercial vehicles and light trucks primarily utilize mechanical release bearings and pneumatic release bearings, each with its own advantages and disadvantages. While mechanical release bearings offer a simpler structure and lower operational comfort, they offer significant cost advantages. Pneumatic release bearings are far superior to mechanical types in terms of operational comfort, but they place higher demands on the vehicle's air source and are more suitable for medium- and heavy-duty trucks. To address the issue of insufficient air supply in light commercial vehicles, hydraulic release bearings, as a highly integrated, fully lubricated, and precisely controlled product, better meet market demand. However, hydraulic release bearings are less compatible with AMTs and must rely on pipeline connections. Furthermore, the special-shaped pipelines make the entire manufacturing process extremely cumbersome and complex, hindering exhaust. Utility Model Content

[0004] The purpose of the present utility model is to overcome the shortcomings of the above-mentioned prior art and provide a hydraulic actuator for an electro-hydraulic transmission to solve the problem in the prior art that the hydraulic release bearing and the AMT are connected through heterogeneous pipes and have low adaptability.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A hydraulic actuator for an electro-hydraulic transmission includes a hydraulic cylinder and a high-pressure oil passage disposed within the hydraulic cylinder. An annular high-pressure cavity is formed within the side wall of the hydraulic cylinder along the axial direction. The rear end of the high-pressure cavity is connected to one end of the high-pressure oil passage, and the other end of the high-pressure oil passage is connected to an oil inlet. A piston is disposed at the front end of the high-pressure cavity.

[0007] The hydraulic cylinder body is provided with a release bearing, the release bearing and the hydraulic cylinder body are slidably connected, and the release bearing and the front end of the piston are against each other;

[0008] A magnetic steel is arranged on the release bearing, and a displacement sensor is arranged on the hydraulic cylinder body. The displacement sensor is in contact with the magnetic steel.

[0009] The further improvement of the present invention is:

[0010] Preferably, the displacement sensor is arranged on the hydraulic cylinder body through a sensor bracket, and the magnet is arranged on the release bearing through a magnet bracket.

[0011] Preferably, the displacement sensor is connected to a displacement sensor plug via a wiring harness.

[0012] Preferably, a plurality of weight-reducing holes are provided on the rear end surface of the hydraulic cylinder body, and the weight-reducing holes avoid the internal oil passages of the hydraulic cylinder body.

[0013] Preferably, the hydraulic cylinder body is made of aluminum alloy.

[0014] Preferably, the oil inlet is arranged on the rear end surface of the hydraulic cylinder body, and a high-pressure sealing ring is arranged around the oil inlet in the circumference.

[0015] Preferably, an elastic mechanism is provided on the outer side of the hydraulic cylinder body, one end of the elastic mechanism is connected to the rear end of the hydraulic cylinder body, and the other end is connected to the release bearing.

[0016] Preferably, a dust cover is provided on the outside of the elastic mechanism.

[0017] Preferably, a sealing ring is provided at the rear end of the piston.

[0018] Preferably, the release bearing includes an outer ring, an inner ring and a connecting ring that are connected to each other; the connecting ring is sleeved on the outer side of the hydraulic cylinder body near the top part, the connecting ring is slidably connected to the outside of the hydraulic cylinder body, the outer sleeve of the connecting ring is provided with an inner ring, and the inner ring is connected to the outer ring.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The utility model discloses a hydraulic actuator for an electro-hydraulic transmission, wherein the hydraulic actuator is provided with an integrated hydraulic release bearing on a hydraulic cylinder body, and a piston is provided between the integrated hydraulic release bearing and a high-pressure chamber inside the hydraulic cylinder body. Through the process of oil inlet and oil outlet, the purpose of moving the release bearing along the hydraulic actuator is achieved. A displacement sensor and a magnet are provided on the outside of the hydraulic cylinder body, and the displacement sensor can measure the moving position of the integrated hydraulic release bearing through the change in the relative position of the two. The integrated hydraulic release bearing and the hydraulic cylinder body have good adaptability and a simple installation process. This makes the actuator have the advantages of easy processing, simple assembly, good sealing, etc., and its lightweight, lubrication conditions, control and other aspects are relatively excellent. It can not only meet the diversity of subsequent matching, but also reduce the difficulty of product manufacturing, and effectively avoid oil leakage in the hydraulic release system.

[0021] Furthermore, the displacement sensor is arranged on the hydraulic cylinder body through the sensor bracket, and the magnet is arranged on the release bearing through the magnet bracket, which can respectively improve the installation stability of the two, especially the stability of the magnet when moving.

[0022] Furthermore, the displacement sensor is connected to a displacement sensor plug through a wiring harness. The provision of the displacement sensor plug facilitates the connection between the displacement sensor and an external control and monitoring system, so that the measurement signal can be transmitted in a timely manner.

[0023] Furthermore, weight-reducing holes are provided on the hydraulic cylinder body, and the hydraulic cylinder body itself is made of aluminum alloy, which not only improves the degree of lightweight, but also ensures the compressive strength of the shell.

[0024] Furthermore, the hydraulic cylinder body is made of aluminum alloy, which avoids the adverse effects caused by defects such as air holes and sand holes during the casting process of the hydraulic cylinder body.

[0025] Furthermore, a high-pressure sealing ring is provided on the oil inlet to improve the sealing performance.

[0026] Furthermore, an elastic mechanism is provided outside the hydraulic cylinder body, which can limit the release bearing when it moves. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of one side of a hydraulic actuator for an electro-hydraulic transmission of the present invention;

[0028] Figure 2 This is a schematic diagram of the other side of the hydraulic actuator for the electro-hydraulic transmission of the present invention;

[0029] Figure 3 It is a side partial cross-sectional view of the present utility model.

[0030] Among them: 1. Displacement sensor plug; 2. Wiring harness; 3. Displacement sensor; 4. Magnet; 5. Bolt fixing hole; 6. Release bearing; 7. Dust cover; 8. Positioning pin mounting hole; 9. High-pressure oil channel; 10. High-pressure sealing ring; 11. Weight reduction hole; 12. Sensor bracket; 13. Hydraulic cylinder body; 14. Piston; 15. High-pressure cavity; 16. Oil inlet; 17. Magnet bracket; 18. Elastic mechanism; 19. Connector; 20. Annular groove; 601. Outer ring; 602. Inner ring; 603. Connecting ring. DETAILED DESCRIPTION

[0031] The present invention is described in further detail below with reference to the accompanying drawings:

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance; in addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] See also Figure 1-Figure 3 The present invention discloses a hydraulic actuator for an electro-hydraulic transmission, comprising a release bearing 6, a piston 14, and a hydraulic cylinder 13. The release bearing 6 and the piston 14 are both mounted on the hydraulic cylinder 13. In this invention, the side on which the release bearing 6 is located is defined as the front end of the hydraulic cylinder 13, and the side opposite the release bearing 6 is defined as the bottom end. This standard will be used in the subsequent description.

[0034] A high-pressure chamber 15 is provided inside the side wall of the hydraulic cylinder body 13. The high-pressure chamber 15 is arranged in the inner wall near the bottom. The bottom end of the high-pressure chamber 15 is connected to the high-pressure oil channel 9. The other end of the high-pressure oil channel 9 is connected to the oil inlet 16. The oil inlet 16 is arranged on the bottom end surface of the hydraulic cylinder body 13; the piston 14 is arranged in the high-pressure chamber 15 and can move along the high-pressure chamber 15 according to the filling and release of oil.

[0035] An elastic mechanism 18 is wrapped around the outside of the hydraulic cylinder body 13, and a dust cover 7 is provided on the outside of the elastic mechanism 18. The rear end of the elastic mechanism 18 is connected to the rear end of the hydraulic cylinder body 13, and the front end of the elastic mechanism 18 is connected to a connecting member 19, which is also connected to the release bearing 6. The provision of the connecting member 19 enables the elastic mechanism 18 to move synchronously with the release bearing 6.

[0036] The hydraulic cylinder body 13 is provided with a sensor bracket 12 for mounting the displacement sensor 3 and a magnetic steel bracket 17 for mounting the magnetic steel 4. Figure 1 and Figure 2 As shown, the sensor bracket 12 is integrally connected to the outer edge of the bottom end of the hydraulic cylinder body 13, and the displacement sensor 3 is detachably mounted on the sensor bracket 12. The magnetic steel bracket 17 is connected to the release bearing 6, and the magnet 4 is detachably mounted on the magnetic steel bracket 17 via bolts. The displacement sensor 3 is connected to the displacement sensor plug 1 via a wiring harness 2. This structure ensures that when the piston 14 moves, it can also move the release bearing 6, which in turn moves the magnet 4. The magnet 4 follows the axial movement of the piston 14, and the magnet 4 cooperates with the displacement sensor 3 to sense and transmit the displacement signal. The displacement sensor 3 can be selected in sizes ranging from 0 to 40 mm to meet detection requirements.

[0037] As a preferred solution, the displacement sensor 3 and the magnet 4 are in contact with each other, but are staggered to prevent the displacement sensor 3 from affecting the axial movement of the magnet 4. The displacement sensor 3 and the magnet 4 can be in contact with each other at the sides, or at the inner and outer end faces (the inner end face close to the hydraulic cylinder body 13, the outer end face close to the hydraulic cylinder body 13) to achieve measurement of the movement displacement of the magnet 4.

[0038] See also Figure 3 The release bearing 6 is divided into an outer ring 601, an inner ring 602 and a connecting ring 603 which are connected to each other. The connecting ring 603 is sleeved on the outer side of the hydraulic cylinder body 13 near the top part. The connecting ring 603 is slidably connected to the outside of the hydraulic cylinder body 13. The outer part of the connecting ring 603 is sleeved with the inner ring 602, and the inner ring 602 is connected to the outer ring 601.

[0039] As a preferred solution, the oil inlet 16 is provided with a high-pressure sealing ring 10 along its circumference.

[0040] In some embodiments of the present invention, the release bearing 6 is provided with two nylon sliding bearings in the two sliding bearing mounting holes within the connecting ring 603. The sliding bearings support smooth axial movement of the bearing on the housing. The special material of the sliding bearings also provides self-lubrication, ensuring flexible and non-binding movement of the bearing.

[0041] In some embodiments of the present invention, a sealing ring is provided on the side of the piston 14 facing the high-pressure chamber 15 .

[0042] In some implementation schemes of the present invention, the hydraulic cylinder body 13 is made of an aluminum alloy forging process, which avoids the adverse effects caused by defects such as air holes and sand holes during the casting process of the hydraulic cylinder body 13.

[0043] In some embodiments of the present invention, a plurality of weight-reducing holes 11 are provided on the bottom mounting surface of the hydraulic cylinder body 13 at positions avoiding the internal oil passages, which not only improves the lightweight degree but also ensures the pressure resistance of the shell.

[0044] In some embodiments of the present invention, a positioning pin installation hole 8 is provided on the bottom end surface of the hydraulic cylinder body 13 for installing a connecting positioning pin.

[0045] In some embodiments of the present invention, an annular groove 20 is provided at the rear end of the high-pressure cavity 15 at the bottom of the high-pressure oil channel 9 to enable effective exhaust during the movement of the hydraulic cylinder 13 .

[0046] The present invention improves the internal structure and interface of the hydraulic release bearing. The traditional connection method of the hydraulic release bearing is basically to connect directly to the oil pipe. The shell is difficult to cast and the special-shaped oil pipe is difficult to form. Most of them use quick-plug connections. The quick-plug female end interface is difficult to make and there is a risk of disengagement when working under high-pressure conditions. The mounting surface of the hydraulic release bearing and the hydraulic cylinder body 13 of the present invention is a surface pressure combination design, which eliminates the external oil pipe casting of the hydraulic release bearing. The hydraulic release bearing shell adopts an aluminum alloy forging process and has high compressive strength. At the same time, the exterior of the shell is simplified in design, which reduces manufacturing costs and improves industrial manufacturability. The joint surface adopts a Y-shaped sealing ring design. When the bearing and the bearing seat are pressed tightly, the joint surface is sealed by the extrusion of the lip. The verticality and roughness of the joint surface ensure the sealing performance. Compared with the traditional structure, the internal oil channel of the hydraulic release bearing has an additional annular groove 20 design. The annular groove 20 can effectively solve the problems such as poor exhaust and gas accumulation.

[0047] The working process of the utility model is as follows:

[0048] Step 1. When shifting gears is required, the clutch must be disengaged to interrupt the power. At this time, the system controls the high-pressure oil to be injected into the hydraulic actuator from the oil inlet 16. The high-pressure oil is transmitted through the high-pressure oil channel 9 to reach the piston 14. Under the action of pressure, the piston 14 is pushed from the rear dead center to the front dead center. When the piston 14 hits the front release bearing 6, it pushes the release bearing 6 to move 12mm to the front end. The release bearing 6 presses the clutch release finger to realize the separation function. At this time, the power is interrupted.

[0049] Step 2: After the gear shift is completed, the clutch no longer needs to be pushed open. At this time, the system controls the high-pressure oil to return. Due to the reaction force of the clutch release finger (3-4KN), the bearing end of the hydraulic release bearing 6 and the piston 14 are pushed back to the initial position. The entire complete cycle is a separation process.

[0050] During the entire working process, the magnet 4 moves axially along with the release bearing 6. Under the action of the displacement sensor 3, the position of the entire release bearing 6 can be monitored, and then the wiring harness 2 and the sensor plug 1 transmit the displacement signal to the system to obtain an accurate displacement amount.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic actuator for an electro-hydraulic transmission, characterized in that: It comprises a hydraulic cylinder body (13) and a high-pressure oil passage (9) arranged in the hydraulic cylinder body (13); an annular high-pressure cavity (15) is provided inside the side wall of the hydraulic cylinder body (13) along the axial direction, the rear end of the high-pressure cavity (15) is connected to one end of the high-pressure oil passage (9), and the other end of the high-pressure oil passage (9) is connected to the oil inlet (16); a piston (14) is provided at the front end of the high-pressure cavity (15); The hydraulic cylinder body (13) is provided with a release bearing (6), the release bearing (6) and the hydraulic cylinder body (13) are slidably connected, and the front ends of the release bearing (6) and the piston (14) are abutted against each other; A magnetic steel (4) is provided on the release bearing (6), and a displacement sensor (3) is provided on the hydraulic cylinder body (13), wherein the displacement sensor (3) is in contact with the magnetic steel (4).

2. The hydraulic actuator for an electro-hydraulic transmission according to claim 1, characterized in that: The displacement sensor (3) is arranged on the hydraulic cylinder body (13) via a sensor bracket (12), and the magnetic steel (4) is arranged on the release bearing (6) via a magnetic steel bracket (17).

3. The hydraulic actuator for an electro-hydraulic transmission according to claim 1, characterized in that: The displacement sensor (3) is connected to a displacement sensor plug (1) via a wiring harness (2).

4. The hydraulic actuator for an electro-hydraulic transmission according to claim 1, characterized in that: A plurality of weight-reducing holes (11) are provided on the rear end surface of the hydraulic cylinder body (13), and the weight-reducing holes (11) avoid the internal oil passages of the hydraulic cylinder body (13).

5. The hydraulic actuator for an electro-hydraulic transmission according to claim 1, characterized in that: The hydraulic cylinder body (13) is made of aluminum alloy.

6. The hydraulic actuator for an electro-hydraulic transmission according to claim 1, characterized in that: The oil inlet (16) is arranged on the rear end surface of the hydraulic cylinder body (13), and a high-pressure sealing ring (10) is arranged around the circumference of the oil inlet (16).

7. The hydraulic actuator for an electro-hydraulic transmission according to claim 1, characterized in that: An elastic mechanism (18) is provided on the outside of the hydraulic cylinder body (13), one end of the elastic mechanism (18) is connected to the rear end of the hydraulic cylinder body (13), and the other end is connected to the release bearing (6).

8. The hydraulic actuator for an electro-hydraulic transmission according to claim 7, characterized in that: A dust cover (7) is provided outside the elastic mechanism (18).

9. The hydraulic actuator for an electro-hydraulic transmission according to claim 1, characterized in that: A sealing ring is provided at the rear end of the piston (14).

10. A hydraulic actuator for an electro-hydraulic transmission according to any one of claims 1 to 9, characterized in that: The release bearing (6) includes an outer ring (601), an inner ring (602) and a connecting ring (603) which are connected to each other; the connecting ring (603) is sleeved on the outer side of the hydraulic cylinder body (13) near the top portion, the connecting ring (603) and the outer side of the hydraulic cylinder body (13) are slidably connected, the outer side of the connecting ring (603) is sleeved with the inner ring (602), and the inner ring (602) is connected to the outer ring (601).

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