JPH03219121A - Hydraulic clutch - Google Patents

Abstract

PURPOSE:To dispense with an oil spray device for lubricating clutch elements by forming the inside of a clutch cover in which a clutch disc is accommodated into a closed space, and filling up the closed space with oil to lubricate a frictionally engaging face between the clutch disc ad the clutch cover with the oil. CONSTITUTION:A clutch has an oil cylinder 26 to axially press a clutch disc 20, and the oil cylinder 26 presses the disc 20 into contact with a clutch cover 14 to change them into a contacting state. In this case, the inside of the cover 14 in which the disc is accommodated is formed into a closed space, whose inside is filled up with oil, and a frictional engaging face 19 between the disc 20 and the cover 14 is lubricated with the oil. The durability of the face 19 can thereby be improved, and an oil injecting mechanism for the face 19 can be omitted.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a hydraulic clutch, and particularly to a clutch. Summary of the Invention The inside of a clutch cover in which a clutch disc of a hydraulic clutch is housed is a closed space, and this closed space is filled with oil. The frictional engagement surface with the cover is lubricated with the oil, and the present invention provides a hydraulic clutch that is simple in structure, lightweight, and compact. K. Prior Art A mechanical automatic transmission uses an actuator to select a speed change gear. These automatic transmissions are now combined with a clutch whose switching is controlled by an actuator. As such a latch, the applicant of the present application has, for example,
No. 2-290097 proposes a hydraulic clutch. This hydraulic clutch includes a hydraulic cylinder, and the hydraulic cylinder presses the clutch disc against the clutch cover to effect connection. Moreover, oil is injected onto the frictional engagement surfaces between the clutch facing and the clutch cover to lubricate the frictional engagement surfaces, thereby increasing durability. Problems to be Solved by the Invention] However, in such a hydraulic clutch using oil spray, the entire flywheel housing is a closed space to prevent oil from scattering to the outside. The oil injected onto the frictional engagement surfaces is collected by an oil pan provided at the bottom of the flywheel housing, sucked in by an oil pump, and recirculated. Therefore, such a hydraulic clutch not only has a complicated structure, but also has a large weight and is extremely large in size, making it difficult to make the clutch more compact. Furthermore, the structure of the oil supply path is complicated, resulting in an increase in cost. The present invention has been made in view of these problems, and an object of the present invention is to provide a hydraulic clutch that has a simple structure and can be made lighter and more compact.

[Means to solve the problem]

The present invention provides a hydraulic clutch having an oil cylinder for pressing a clutch disc in the axial direction, and in which the clutch disc is pressed against a clutch cover and switched to a connected state by the oil cylinder, wherein the clutch disc is retracted. The inside of the clutch cover is made into a closed space, and the closed space is filled with oil, and the frictional engagement surfaces of the clutch disc and the clutch cover are lubricated with the oil. K effect] Therefore, the oil filled in the clutch cover lubricates the frictional engagement surfaces between the clutch disc and the clutch cover, thereby making it possible to improve the durability of the frictional engagement surfaces. At the same time, it becomes possible to omit a mechanism for injecting oil onto the frictional engagement surface. K Embodiment FIG. 1 shows the structure of a hydraulic clutch according to an embodiment of the present invention, in which a flex plate 11 forming a flexible wheel is attached to the tip of a crankshaft 10 forming an output shaft of an engine. is fixed. A ring gear 12 is attached to the outer peripheral side of the flex plate 11. Further, the flex plate 11 is connected to a clutch cover 14 via a connecting ring 13. Boss 1 on the center side of the clutch cover 14
5 has a recess 16 formed at one end thereof, and the recess 16 receives the tip of an input shaft 17 of the transmission. An end surface on the outer peripheral side of the clutch cover 14 constitutes a friction surface 19, and a facing 21 of a clutch disc 20 is pressed onto this friction surface 19. Further, the hub 22 on the center side of the clutch disc 20 is engaged with the input shaft 17 via a spline 23, and is coupled to be movable on the input shaft 17 in the axial direction. An oil jacket 25 is coupled to the outer peripheral side of the clutch cover 14 via a spacer ring 24. An oil cylinder 26 is connected to the oil jacket 25, and a piston 27 is slidably held within the oil cylinder 26. Moreover, two oil passages 28.2 are formed in the oil jacket 25. These oil passages 28 and 29 communicate with ports 31 and 32 of a rotary valve 30 disposed on the outer peripheral side of the input shaft 17, respectively. The rotary valve 30 also includes a port 33 that communicates with the space inside the oil jacket 25. These ports 31~
33 is connected to a control valve 34. Note that the control valve 34 is supported by a clutch housing 35. Next, the piping system for controlling the supply of pressure oil to the hydraulic cylinder 26 will be explained. As shown in FIG. 2, the oil pump 37 sucks oil in the oil tank 38. Note that a filter 39 is disposed within the tank 38 to filter the returned oil. A flow rate control valve 40 is connected to the discharge side of the oil pump 37, and is also connected to a first switching valve 41. The back pressure of the spool of this first switching valve 41 is controlled by a duty control valve 42. and the first switching valve 4
A first port of the clutch cover 14 is communicated with a space within the clutch cover 14, and another port is communicated with a second switching valve 43. And this second switching valve 43
The back pressure of the spool is controlled by a duty control valve 44. Further, a relief valve 45 is connected to the oil passage 29. Furthermore, this relief valve 4
An oil cooler 4 is installed in the oil passage 29 on the downstream side of the oil cooler 4.
6 is provided, and this oil cooler 46 cools the circulating oil. The cooled oil then returns to the tank 38 and is filtered by a filter 39. In the above configuration, when the duty control valve 42 is opened, the back pressure of the spool of the first switching valve 41 becomes almost zero, so the spool of the switching valve 41 is moved to the right by the built-in spring. become. Therefore, the port of the first switching valve 41 communicating with the second switching valve 43 is opened. Moreover, at this time, the duty control valve 4
4 is opened, the back pressure of the spool of this second switching valve 43 decreases. Therefore, the spool of the switching valve 43 is moved to the right by the built-in spring. Since the two switching valves 41 and 43 are connected in series with each other in this way, these switching valves 41 and 43 are connected in series with each other.
．． Oil pressurized by the oil pump 37 is supplied to the cylinder 26 through the oil pump 43 . This means in FIG. 1 that the pressure P1 generated in the control valve 34 is supplied through the port 31 and the oil passage 28 to the chamber to the right of the piston 27 of the cylinder 26. Therefore, the piston 27 moves to the left in FIG. 1 and presses the clutch disc 20 against the friction surface 19 of the clutch cover 14. Therefore, the friction surface 19 of the clutch cover 14 and the clutch facing 21 are frictionally engaged with each other, and the clutch is switched to the connected state. Next, the operation of disengaging the clutch will be explained. When the duty control valve 44 is closed, the back pressure on the spool of the second switching valve 43 increases, so the spool moves to the left in FIG. 2 against the built-in spring, and the oil passage 28
The port communicating with is blocked. Therefore, the oil pressurized by the oil pump 37 escapes to the reservoir side. Since the duty control valve 42 is closed at the same time, the back pressure on the spool of the first switching valve 41 increases, and the spool of this switching valve 41 also moves to the left in FIG. 2 against the built-in spring. Therefore, the port of the switching valve 41 communicating with the internal space of the clutch cover 14 is opened, and the oil pressurized by the oil pump 37 is supplied to the closed space within the clutch cover 14. This means that the hydraulic pressure P2 is
This means that the oil is supplied into the closed space formed by the clutch cover 14 and the oil jacket 25. The piston 27 of the oil cylinder 26 is pushed to the right in FIG. 1 by such oil pressure P2. Note that after this, the oil pressure P2 is applied to the oil passage 29 and the port 32.
It returns to the control valve 34 through. Then, since the piston 27 moves back due to the above-mentioned oil pressure P2, the pressure that presses the clutch disc 20 against the clutch cover 14 is released, and the clutch is switched to the disengaged state. In this way, the hydraulic clutch according to this embodiment prevents oil from leaking into the flywheel housing 35.
A closed space closed by the clutch cover 14 and the oil jacket 25 is filled with oil, and switching between connection and disconnection is performed while circulating this oil. Moreover, clutch cover 14
Since the oil in the inner space lubricates between the clutch facing 21 and the friction engagement surface 19 of the clutch cover 14, the durability of the clutch can be increased and the oil spray device can becomes unnecessary. Further, the hydraulic pressure P2 in this closed space generates a force that causes the piston 27 to move back. Therefore, it is possible to provide a hydraulic clutch that has a simple structure, can be made lighter and more compact, and can also achieve lower costs. [Effects of the Invention] As described above, the present invention makes the inside of the clutch cover in which the clutch disc is housed a closed space, fills this closed space with oil, and reduces the frictional relationship between the clutch disc and the clutch cover. The mating surfaces are lubricated with oil. Therefore, it is possible to provide a hydraulic clutch that lubricates the frictional engagement surfaces with the oil filled in the closed space within the clutch cover without requiring an oil spray device for lubrication, and the structure is simple and lightweight. Moreover, it becomes possible to provide a compact hydraulic clutch.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a hydraulic clutch according to an embodiment of the present invention, and FIG. 2 is a diagram of oil piping of this hydraulic clutch. The names of the main parts in the drawings are as follows. 14. 19. 20. 21. 25. 26. 27. 28. 34. 37. 41. 43. ・Clutch cover, friction surface, clutch disc, facing, oil jacket, oil cylinder, piston, oil passage, control valve, oil pump, 1st switching valve, 2nd switching valve

Claims (1)

[Claims] 1. In a hydraulic clutch having an oil cylinder for pressing the clutch disc in the axial direction, the oil cylinder presses the clutch disc against the clutch cover to switch to a connected state, and the clutch disc is retracted. The inside of the clutch cover is a closed space, and the closed space is filled with oil, and a frictional engagement surface between the clutch disc and the clutch cover is lubricated with the oil. Hydraulic clutch.