Centering device and clutch

Abstract

The present application discloses a centering device and a clutch, and relates to the technical field of clutches. The centering device disclosed in the present application is used to center and connect an input shaft and an output shaft. An oil supply hole and a mounting hole are formed on the input shaft. A central conical hole is formed at one end of the output shaft. A first piston is slidably arranged in the mounting hole, and a piston cylinder is formed between the first piston and the end of the mounting hole close to the oil supply hole. A guide device guides the sliding of the first piston. A centering shaft is arranged on the side of the first piston facing away from the oil supply hole. The axis of the centering shaft is colinear with the axis of the input shaft. The centering shaft includes a positioning shaft section and a centering shaft section. The positioning shaft section is axially positioned on the first piston and can rotate around its axis. The diameter of the centering shaft section gradually decreases in a direction away from the positioning shaft section and is assembled in the central conical hole to align the axis of the input shaft with the axis of the output shaft. A limit device can limit the rotation between the centering shaft and the output shaft. An elastic member abuts between the output shaft and the centering shaft.

Description

Technical Field

[0001] The present application relates to the technical field related to clutches, and in particular to a centering device and a clutch. Background Art

[0002] Low-speed engine drive systems with shaft-belt generators can implement PIO / PTI / PTH functions, reserve power when the main engine is operating normally, improve the system's fuel economy, and reduce costs; provide auxiliary power to the main engine under harsh sailing conditions or improve its efficiency under low-load conditions; and serve as emergency propulsion in the event of a main engine failure, improving the reliability of ship operations. Currently, low-speed engine drive systems with shaft-belt generators are typically connected to a gearbox with a PTO output via a high-torque propeller clutch, and connected to a thrust bearing to withstand propeller thrust. High-torque propeller clutches typically have two-section input and output shafts. When the clutch is engaged or disengaged, radial movement may occur, causing the shafting system to become misaligned, leading to uneven load distribution on the bearings and excessive wear on overloaded bearings.

[0003] In the prior art, in order to achieve the centering of the clutch input shaft and the clutch output shaft, a centering device is usually provided to achieve the centering of the two shafts. An elastic member is provided between the two shafts to provide a reset force to the input shaft when the clutch is disengaged, thereby temporarily separating the main engine from the gearbox.

[0004] However, under certain operating conditions, a speed difference between the input shaft and the output shaft may cause damage to the elastic member disposed between the two shafts, thereby reducing the reliability of the elastic member and thereby reducing the reliability of the centering device and the clutch. Summary of the Invention

[0005] The present application provides a centering device and a clutch to solve the problem of low reliability of the centering device and the clutch.

[0006] To achieve the above objectives, in one aspect, the present application provides a centering device for centering and connecting an input shaft and an output shaft. The input shaft is formed with a central stepped hole, the small hole of the central stepped hole is configured as an oil supply hole, and the large hole of the central stepped hole is configured as a mounting hole. A central tapered hole is formed at one end of the output shaft. The centering device comprises:

[0007] a first piston, the first piston being slidably disposed in the mounting hole and forming a piston cylinder between the first piston and an end of the mounting hole close to the oil supply hole;

[0008] a guide device capable of guiding the sliding of the first piston;

[0009] a centering shaft, the centering shaft being disposed on a side of the first piston facing away from the oil supply hole, the axis of the centering shaft being collinear with the axis of the input shaft, the centering shaft comprising a positioning shaft section and a centering shaft section, the positioning shaft section being axially positioned on the first piston and being rotatable about its axis, the diameter of the centering shaft section gradually decreasing in a direction away from the positioning shaft section, and the centering shaft section being assembled in the central tapered hole to align the axes of the input shaft and the output shaft;

[0010] a limiting device capable of limiting the rotation between the centering shaft and the output shaft;

[0011] An elastic member is abutted between the output shaft and the centering shaft.

[0012] In some embodiments of the present application, a circular receiving hole is formed on the first piston, the circular receiving hole has a closed end and an open end, the open end faces the output shaft, and the positioning shaft segment is axially positioned in the circular receiving hole.

[0013] In some embodiments of the present application, the centering device further comprises:

[0014] A piston bearing, wherein the inner ring of the piston bearing is sleeved on and fixed to the positioning shaft segment, and the outer ring of the piston bearing is fixedly connected to the inner wall of the circular receiving hole to ensure that the positioning shaft segment can rotate relative to the first piston.

[0015] In some embodiments of the present application, the guiding device includes a guiding groove and a guiding member that slides with the guiding groove, the extension direction of the guiding groove is consistent with the axial direction of the input shaft, and one of the guiding member and the guiding groove is arranged on the outer peripheral side of the first piston, and the other is arranged on the inner wall of the mounting hole.

[0016] In some embodiments of the present application, the guide member includes a guide flat key and a keyway for accommodating the guide flat key.

[0017] In some embodiments of the present application, a receiving hole is formed on the output shaft, which is connected to the central conical hole and located at the small end of the central conical hole. The end of the receiving hole facing away from the conical inner hole is a closed end, and the elastic member abuts between the closed end of the receiving hole and the centering shaft section.

[0018] In some embodiments of the present application, the limiting device includes a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion are connected to each other, one of the first limiting portion and the second limiting portion is arranged on the centering shaft, and the other is arranged on the output shaft.

[0019] In some embodiments of the present application, the limiting device includes:

[0020] A limiting shaft segment is formed on the centering shaft and is located on the side of the centering shaft segment away from the positioning shaft segment. The limiting shaft segment cooperates with the accommodating hole. One of the first limiting portion and the second limiting portion is provided on the limiting shaft segment, and the other is provided on the accommodating hole.

[0021] In some embodiments of the present application, the first limiting portion is configured as an internal spline formed on the accommodating hole, and the second limiting portion is configured as an external spline formed on the limiting shaft segment, and the internal spline and the external spline are clearance-fitted.

[0022] In some embodiments of the present application, a blind hole is formed on the limiting shaft segment and is recessed toward the centering shaft segment. At least a portion of the elastic member is disposed in the blind hole and abuts against a closed end of the blind hole.

[0023] In some embodiments of the present application, the length of the internal spline and the length of the external spline are both greater than the moving distance of the centering shaft in a direction away from the output shaft.

[0024] Compared to the prior art, the present invention utilizes a guide device to ensure that the input shaft and the first piston have the same rotational speed, and a position-limiting device to ensure that the centering shaft and the output shaft have the same rotational speed. During operation, oil is supplied to the piston cylinder through the oil supply port. The first piston moves leftward under the action of oil pressure. Because the positioning shaft segment in the centering shaft is axially positioned on the first piston, the centering shaft, driven by the first piston, can move leftward synchronously with the first piston and compress the elastic member until the centering shaft segment inserts into the aforementioned central conical hole, completing the alignment. When the oil supply port stops supplying oil to the piston cylinder, the centering shaft, under the action of the restoring force of the elastic member, drives the first piston to move rightward synchronously, at which point the piston cylinder begins to drain oil. Under certain operating conditions, the input and output shafts have different rotational speeds. The present invention utilizes a position-limiting device to ensure that the centering shaft and the output shaft have the same rotational speed. This means that there is no relative rotation between the centering shaft and the output shaft. The elastic member is then subjected only to forces along its extension and contraction direction. This prevents damage to the elastic member due to relative rotation between the centering shaft and the output shaft, thereby improving the reliability of the centering device.

[0025] On the other hand, the present application also provides a clutch, comprising:

[0026] Input shaft;

[0027] output shaft, and

[0028] The above-mentioned centering device is capable of centering and connecting the input shaft and the output shaft.

[0029] In some embodiments of the present application, the clutch further comprises:

[0030] A clutch housing, the clutch housing being arranged on the outside of the input shaft and fixedly connected to the input shaft to drive the clutch housing to rotate synchronously, and a second piston and a clutch oil cylinder being arranged in the clutch housing;

[0031] a friction plate connected to the clutch housing and located on a side of the second piston facing away from the clutch cylinder;

[0032] a steel plate, the steel plate being arranged radially outward of the output shaft and connected to the output shaft, the steel plate being arranged opposite to the friction plate;

[0033] An oil supply line, one end of which is connected to the oil supply hole and the other end is connected to the clutch cylinder. When the oil supply line supplies oil to the clutch cylinder, the second piston pushes the friction plate toward the steel plate under the action of oil pressure and presses the steel plate to transmit the power and torque of the input shaft to the output shaft.

[0034] In some embodiments of the present application, the diameter of the oil supply hole is larger than the diameter of the oil supply pipeline, and the volume of the clutch cylinder is larger than the volume of the first piston cylinder.

[0035] In addition, since the centering device in the clutch of the present application adopts the same structure as the above-mentioned centering device, the two can solve the same technical problems and achieve the same technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 This is a schematic structural diagram of the clutch disengagement in an embodiment of the present application;

[0038] Figure 2 It is a schematic structural diagram of the clutch in the embodiment of the present application when it is engaged.

[0039] The main reference numerals in the drawings of this application specification are described as follows:

[0040] 1-input shaft; 101-oil supply hole; 102-piston cylinder; 2-output shaft; 201-center tapered hole; 202-accommodating hole; 3-first piston; 31-circular receiving hole; 4-guide device; 41-guide flat key; 5-centering shaft; 51-positioning shaft section; 52-centering shaft section; 53-limiting shaft section; 6-limiting device; 61-internal spline; 62-external spline; 7-elastic part; 8-piston bearing; 9-clutch housing; 91-second piston; 92-clutch cylinder; 10-friction plate; 11-steel plate; 12-oil supply pipeline; 13-bearing. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0042] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0045] This application provides a centering device and a clutch, each of which is described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment below have their own specific focus. For details not provided in one embodiment, please refer to the relevant descriptions of other embodiments.

[0046] Reference Figure 1 and Figure 2 The centering device provided in the present application is used to center and connect the input shaft 1 and the output shaft 2. A central stepped hole is formed on the input shaft 1. The small hole of the central stepped hole is configured as an oil supply hole 101, and the large hole of the central stepped hole is configured as a mounting hole. A central conical hole 201 is formed at one end of the output shaft 2. The centering device includes a first piston 3, a guide device 4, a centering shaft 5, a limit device 6 and an elastic member 7. The first piston 3 is slidably arranged in the mounting hole, and a piston cylinder 102 is formed between the first piston 3 and one end of the mounting hole close to the oil supply hole 101. The guide device 4 can guide the sliding of the first piston 3 to ensure that the first piston 3 can only slide back and forth along the axial direction of the mounting hole (i.e., the left and right direction). The centering shaft 5 is arranged on the side of the first piston 3 facing away from the oil supply hole 101. The axis of the centering shaft 5 is colinear with the axis of the input shaft 1. The centering shaft 5 includes a positioning shaft section 51 and a centering shaft section 52. The positioning shaft section 51 is axially positioned on the first piston 3 and can rotate around its axis. The diameter of the centering shaft section 52 gradually decreases in the direction away from the positioning shaft section 51 and is assembled in the central conical hole 201 to align the axis of the input shaft 1 and the axis of the output shaft 2, thereby achieving the centering of the input shaft 1 and the output shaft 2. The limiting device 6 can limit the rotation between the centering shaft 5 and the output shaft 2. The elastic member 7 abuts between the output shaft 2 and the centering shaft 5. In some embodiments of the present application, the elastic member 7 is a spring.

[0047] Compared with the prior art, the present application can ensure that the input shaft 1 and the first piston 3 have the same rotational speed through the guide device 4, and ensure that the centering shaft 5 and the output shaft 2 have the same rotational speed through the limit device 6. During specific use, oil is supplied to the piston cylinder through the oil supply hole 101. At this time, the first piston 3 moves to the left under the action of oil pressure. Since the positioning shaft segment 51 in the centering shaft 5 is axially positioned on the first piston 3, the centering shaft 5 can move to the left synchronously with the first piston 3 under the drive of the first piston 3 and compress the elastic member 7 until the centering shaft segment 52 is inserted into the above-mentioned central conical hole 201 to complete the centering. When the oil supply hole 101 stops supplying oil to the piston cylinder 102, the centering shaft 5 drives the first piston 3 to move synchronously to the right under the action of the reset force of the elastic member 7. At this time, the piston cylinder 102 begins to drain oil. Under some working conditions, the input shaft 1 and the output shaft 2 have different rotational speeds. The present application uses a limiting device 6 to make the centering shaft 5 and the output shaft 2 have the same rotational speed, that is, there is no relative rotation between the centering shaft 5 and the output shaft 2. At this time, the elastic member 7 is only subjected to force along its extension direction, thereby avoiding damage to the elastic member 7 due to the relative rotation between the centering shaft 5 and the output shaft 2, thereby improving the reliability of the above-mentioned centering device.

[0048] Based on the above embodiment, a circular receiving hole 31 is formed on the first piston 3. The circular receiving hole 31 has a closed end and an open end, and the open end faces the output shaft 2. The positioning shaft segment 51 is axially positioned in the circular receiving hole 31, that is, at least a portion of the positioning shaft segment 51 is accommodated in the circular receiving hole 31, thereby reducing the axial length of the above-mentioned centering device.

[0049] Continue to refer to Figure 1 and Figure 2 The centering device further includes a piston bearing 8, the inner ring of which is sleeved on and fixed to the positioning shaft segment 51, and the outer ring of which is fixedly connected to the inner wall of the circular receiving hole 31, so as to ensure that the positioning shaft segment 51 (i.e., the centering shaft 5) can rotate relative to the first piston 3. At the same time, it can also support the positioning shaft segment 51 in the centering shaft 5, thereby better ensuring that the axis of the centering shaft 5 and the axis of the input shaft 1 are collinear.

[0050] For example, there are two piston bearings 8 mentioned above, and each piston bearing 8 is positioned between the positioning shaft segment 51 and the circular receiving hole 31 through a shoulder provided on the positioning shaft segment 51 and the circular receiving hole 31 in the first piston 3, further ensuring the axial positioning effect between the positioning shaft segment 51 and the first piston 3, as well as the supporting effect on the positioning shaft segment 51.

[0051] In some embodiments of the present application, the guide device 4 includes a guide groove and a guide member that slides with the guide groove, the extension direction of the guide groove is consistent with the axial direction of the input shaft 1, and one of the guide member and the guide groove is arranged on the outer peripheral side of the first piston 3, and the other is arranged on the inner wall of the mounting hole, thereby realizing the axial positioning between the first piston 3 and the input shaft 1, that is, ensuring that the first piston 3 and the input shaft 1 rotate synchronously.

[0052] For example, the guide member includes a guide flat key 41 and a keyway for accommodating the guide flat key 41, wherein both the guide flat key 41 and the keyway are arranged on the first piston 3, and the guide groove is arranged on the inner wall of the mounting hole of the input shaft 1. Through key matching, it can be ensured that the assembly of the first piston 3 and the input shaft 1 is relatively simple and convenient.

[0053] Alternatively, a protrusion is directly formed on one of the outer peripheral side of the first piston 3 or the inner side wall of the mounting hole of the input shaft 1, and a guide groove extending along the axial direction of the input shaft 1 is formed on the other, and the protrusion extends into the guide groove and slidably engages with the guide groove.

[0054] It is understood that the guide slot is open at the end closest to the input shaft 1 (the left end of the guide slot is the open end). Therefore, when installing the guide key 41 or protrusion, it is only necessary to align it with the guide slot and push it into the guide slot from left to right, thereby ensuring that the guide key 41 or protrusion is easily assembled with the guide slot.

[0055] Continue to refer to Figure 1 and Figure 2 The limiting device 6 includes a first limiting part and a second limiting part, the first limiting part and the second limiting part are connected, one of the first limiting part and the second limiting part is arranged on the centering shaft 5 and the other is arranged on the output shaft 2 to achieve circumferential positioning of the two and avoid rotation between the two.

[0056] Based on the above embodiment, in order to ensure that the circumferential positioning between the centering shaft 5 and the output shaft 2 is relatively simple and convenient, the above-mentioned centering shaft 5 also includes a limiting shaft segment 53, and the limiting shaft segment 53 is located on the side of the centering shaft segment 52 away from the positioning shaft segment 51, that is, the limiting shaft segment 53 is located on the left side of the centering shaft segment 52, and the limiting shaft segment 53 is matched with the accommodating hole 202, one of the first limiting part and the second limiting part is provided on the limiting shaft segment 53, and the other is provided on the accommodating hole 202, so that the circumferential positioning between the two is achieved by the shaft-hole matching.

[0057] More specifically, the centering shaft 5 includes a limiting shaft segment 53 , a centering shaft segment 52 and a positioning shaft segment 51 which are sequentially arranged along the axial direction thereof.

[0058] For example, the first limiting portion is configured as an internal spline 61 formed on the receiving hole 202, and the second limiting portion is configured as an external spline 62 formed on the limiting shaft segment 53. The internal spline 61 and the external spline 62 are clearance-fitted. Compared to the mating method of protrusions and grooves, the spline mating method can transmit greater torque and prevent fracture at the mating point between the limiting shaft segment 53 and the receiving hole 202.

[0059] In some embodiments of the present application, a blind hole is formed on the limiting shaft segment 53 and is recessed toward the centering shaft segment 52. At least a portion of the elastic member 7 is disposed in the blind hole and abuts against the closed end of the blind hole to further ensure that the elastic member 7 can only be deformed along its extension and contraction direction, that is, the reset force generated after the elastic member 7 is compressed is always toward the right, that is, the reset force is always toward the input shaft 1.

[0060] To further ensure the reliability of the position limit between the centering shaft 5 and the output shaft 2, as well as the reliability of the centering between the output shaft 2 and the input shaft 1, the length of the internal spline 61 and the length of the external spline 62 are both greater than the distance the centering shaft 5 moves away from the output shaft 2. That is, when the elastic member 7 returns to its original state, it indicates that the centering shaft 5 and the first piston 3 have moved rightward to their maximum position. At this time, because the length of the internal spline 61 and the length of the external spline 62 are both greater than the distance the centering shaft 5 moves rightward, the mating portion of the internal spline 61 and the external spline 62 will not separate. This can avoid the problem that after the two separate, due to the speed difference between the centering shaft 5 and the output shaft 2, when the centering shaft 5 moves to the left when the two are re-centered, the external spline 62 on the centering shaft 5 cannot align with the internal spline 61 on the output shaft 2.

[0061] It will be understood that at least a portion of the end portion of the input shaft 1 where the mounting hole is located is inserted into the end portion of the output shaft 2. Specifically, the output shaft 2 is formed, from right to left, with an insertion hole, a central tapered hole 201, and a receiving hole 202. The end portion of the input shaft 1 where the first piston 3 is mounted is inserted into the insertion hole. A bearing 13 is installed between the insertion holes of the input and output shafts 1 and 2 to support the ends of the input and output shafts 1 and 2, further ensuring reliable alignment between the two shafts. More specifically, the bearing 13 is a thrust bearing.

[0062] Continue to refer to Figure 1 and Figure 2The present application also provides a clutch, comprising an input shaft 1, an output shaft 2, and the aforementioned centering device, wherein the centering device is capable of centering and connecting the input shaft 1 and the output shaft 2. In some embodiments of the present application, the clutch is a paddle shaft clutch.

[0063] Since the centering device in the clutch and the centering device mentioned above adopt the same structure, the two can solve the same technical problems and achieve the same technical effects.

[0064] Based on the above embodiment, the clutch further includes a clutch housing 9, a friction plate 10, a steel plate 11, and an oil supply line 12. The clutch housing 9 is disposed outside the input shaft 1 and fixedly connected thereto, driving the clutch housing 9 to rotate synchronously. A second piston 91 and a clutch cylinder 92 are located within the clutch housing 9. The friction plate 10 is connected to the clutch housing 9 and is located on the side of the second piston 91 facing away from the clutch cylinder 92. The steel plate 11 is disposed radially outward from the output shaft 2 and connected thereto, facing the friction plate 10. One end of the oil supply line 12 is connected to the oil supply hole 101, and the other end is connected to the clutch cylinder 92. When the oil supply line 12 supplies oil to the clutch cylinder 92, the second piston 91, under the action of oil pressure, pushes the friction plate 10 toward the steel plate 11, pressing against it, thereby transmitting the power and torque of the input shaft 1 to the output shaft 2.

[0065] It should be noted that the clutch housing 9 has a tapered inner hole. The left end of the input shaft 1 has a tapered outer periphery that extends into the tapered inner hole and forms an interference fit with the inner hole to achieve a fixed connection between the two. Of course, other connection methods such as threaded connection can also be used for connection, and this application does not specifically limit this.

[0066] Therefore, when the oil supply line 12 supplies oil to the clutch cylinder 92, the second piston 91 pushes the friction plate 10 toward the steel plate 11 under the action of oil pressure and presses the steel plate 11. At this time, the friction plate 10 and the steel plate 11 become in a static friction state, and then the input shaft 1 transmits the torque and speed to the steel plate 11 (i.e., the output shaft 2) through the clutch housing 9 and the friction plate 10 that rotate synchronously with the input shaft 1, and then transmits the power and torque of the input shaft 1 to the output shaft 2.

[0067] Based on the above embodiment, the diameter of the oil supply hole 101 is larger than the diameter of the oil supply pipeline 12 , and the volume of the clutch cylinder 92 is larger than the volume of the piston cylinder 102 .

[0068] When the clutch is engaged, the clutch cylinder 92 and piston cylinder 102 simultaneously supply oil. Because the diameter of the oil supply hole 101 is larger than the diameter of the oil supply line 12, the volume of the clutch cylinder 92 is greater than that of the piston cylinder 102. As a result, the piston cylinder 102 fills with oil first. The oil pressure pushes the first piston 3 and the centering shaft 5 leftward, compressing the elastic member 7 until the centering shaft segment 52 is inserted into the center tapered hole 201, thus completing the alignment of the input shaft 1 and the output shaft 2. At this point, the left end of the centering shaft segment 52 abuts the stepped surface between the center tapered hole 201 and the receiving hole 202, limiting the leftward movement of the centering shaft 5. Subsequently, the clutch cylinder 92 fills with oil, and the oil pressure pushes the second piston 91 leftward, compressing the friction plate 10 and the steel plate 11, completing the clutch engagement. This transfers power from the input shaft 1 to the output shaft 2 through the clutch housing 9, friction plate 10, and steel plate 11.

[0069] When the clutch is disengaged, oil supply to the piston cylinder 102 and the clutch cylinder 92 is stopped. At this time, the centering shaft 5 and the first piston 3 move rightward under the action of the elastic member 7, and the piston cylinder 102 drains oil. At the same time, the clutch housing 9 and the friction plate 10 move rightward synchronously, the friction plate 10 and the steel plate 11 are disengaged, and the clutch cylinder 92 drains oil.

[0070] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0071] The above is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims. In addition, the specification uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. The content of this specification should not be understood as limiting the present application.

Claims

1. A centering device for centering and connecting an input shaft and an output shaft, characterized in that: The input shaft is formed with a central stepped hole, the small hole of the central stepped hole is configured as an oil supply hole, the large hole of the central stepped hole is configured as a mounting hole, and one end of the output shaft is formed with a central tapered hole. The centering device includes: a first piston, the first piston being slidably disposed in the mounting hole and forming a piston cylinder between the first piston and an end of the mounting hole close to the oil supply hole; a guide device capable of guiding the sliding of the first piston; a centering shaft, the centering shaft being disposed on a side of the first piston facing away from the oil supply hole, the axis of the centering shaft being collinear with the axis of the input shaft, the centering shaft comprising a positioning shaft section and a centering shaft section, the positioning shaft section being axially positioned on the first piston and being rotatable about its axis, the diameter of the centering shaft section gradually decreasing in a direction away from the positioning shaft section, and the centering shaft section being assembled in the central tapered hole to align the axes of the input shaft and the output shaft; a limiting device capable of limiting the rotation between the centering shaft and the output shaft; An elastic member is abutted between the output shaft and the centering shaft.

2. The centering device according to claim 1, characterized in that: A circular receiving hole is formed on the first piston. The circular receiving hole has a closed end and an open end. The open end faces the output shaft. The positioning shaft segment is axially positioned in the circular receiving hole.

3. The centering device according to claim 2, characterized in that: Also includes: A piston bearing, wherein the inner ring of the piston bearing is sleeved on and fixed to the positioning shaft segment, and the outer ring of the piston bearing is fixedly connected to the inner wall of the circular receiving hole to ensure that the positioning shaft segment can rotate relative to the first piston.

4. The centering device according to claim 1, characterized in that: The guide device includes a guide groove and a guide member that slides with the guide groove. The extension direction of the guide groove is consistent with the axial direction of the input shaft. One of the guide member and the guide groove is arranged on the outer peripheral side of the first piston, and the other is arranged on the inner wall of the mounting hole.

5. The centering device according to claim 4, characterized in that: The guide member includes a guide flat key and a keyway for accommodating the guide flat key.

6. The centering device according to claim 1, characterized in that: The output shaft is provided with a receiving hole connected to the central conical hole and located at the small end of the central conical hole. The end of the receiving hole away from the central conical hole is a closed end. The elastic member abuts between the closed end of the receiving hole and the centering shaft section.

7. The centering device according to claim 6, characterized in that: The limiting device includes a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion are connected, one of the first limiting portion and the second limiting portion is provided on the centering shaft, and the other is provided on the output shaft.

8. The centering device according to claim 7, characterized in that: The limiting device includes: A limiting shaft segment is formed on the centering shaft and is located on the side of the centering shaft segment away from the positioning shaft segment. The limiting shaft segment cooperates with the accommodating hole. One of the first limiting portion and the second limiting portion is provided on the limiting shaft segment, and the other is provided on the accommodating hole.

9. The centering device according to claim 8, characterized in that: The first limiting portion is configured as an internal spline formed on the accommodating hole, and the second limiting portion is configured as an external spline formed on the limiting shaft segment, and the internal spline and the external spline are clearance-fitted.

10. The centering device according to claim 8, characterized in that: A blind hole is formed on the limiting shaft section and is recessed toward the centering shaft section. At least a portion of the elastic member is disposed in the blind hole and abuts against a closed end of the blind hole.

11. The centering device according to claim 9, characterized in that: The length of the inner spline and the length of the outer spline are both greater than a moving distance of the centering shaft in a direction away from the output shaft.

12. A clutch, characterized in that: include: Input shaft; output shaft, and The centering device according to any one of claims 1 to 11 above is capable of centering and connecting the input shaft and the output shaft.

13. The clutch according to claim 12, characterized in that: Also includes: A clutch housing, the clutch housing being arranged on the outside of the input shaft and fixedly connected to the input shaft to drive the clutch housing to rotate synchronously, and a second piston and a clutch oil cylinder being arranged in the clutch housing; a friction plate connected to the clutch housing and located on a side of the second piston facing away from the clutch cylinder; a steel plate, the steel plate being arranged radially outward of the output shaft and connected to the output shaft, the steel plate being arranged opposite to the friction plate; An oil supply line, one end of which is connected to the oil supply hole and the other end is connected to the clutch cylinder. When the oil supply line supplies oil to the clutch cylinder, the second piston pushes the friction plate toward the steel plate under the action of oil pressure and presses the steel plate to transmit the power and torque of the input shaft to the output shaft.

14. The clutch according to claim 13, characterized in that The diameter of the oil supply hole is larger than the diameter of the oil supply pipeline, and the volume of the clutch cylinder is larger than the volume of the first piston cylinder.

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