JPH032759Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a belt-type continuously variable transmission in which a transmission belt is stretched between an input pulley and an output pulley.

[Conventional technology]

Conventionally, as this type of continuously variable transmission, for example, the one shown in Fig.
−18388). That is, to explain using the sectional view of the peripheral part of the input pulley in FIG. A fixed pulley 20 is attached to this rotating shaft 200.
6 is fixed, and a movable pulley 208 is fitted to the rotary shaft 200 so as to be movable in the axial direction and rotatable around the shaft, and a V groove 210 is formed on the circumferential surfaces of the fixed pulley 206 and the movable pulley 208. are doing. A power transmission belt 212 is connected between the V groove 210 of the input pulley and the V groove of the output pulley (not shown).
is being passed over. The effective diameter of the input pulley is varied by a hydraulic drive device 220 provided on the back surface of the movable pulley 208. To explain the configuration of the hydraulic drive device 220, a cylindrical outer peripheral wall 222 is provided on the outer peripheral portion of the movable pulley 208, parallel to the axis of the rotating shaft 200, and protruding toward the side opposite to the transmission belt 212 side. ing. Further, a cylindrical portion 224 is fixed to the outer peripheral portion of the rotating shaft 200, and the outer peripheral wall 224 is fixed to the tip of the cylindrical portion 224.
A flange portion 226 that fits into the inner periphery of the cylindrical portion 224 and the flange portion 226 is fixed.
This constitutes the first piston member 228. Furthermore, a bottomed cylindrical body 230 is fitted onto the outer circumferential portion of the outer circumferential wall 222 , and the inner circumferential surface of the main body 230 abuts the inner circumferential surface of the cylindrical portion 224 of the first piston member 228 . ing. Further, an annular second piston member 232 is fixed to the tip of the outer peripheral wall 222 within the main body 230 by a pin 234 and a bolt (not shown).
The piston member 232 is formed to be slidably fitted to the outer peripheral surface of the cylindrical portion 224 of the first piston member 228. And the movable pulley 208
An oil chamber 236 is formed between the back surface of the piston member 23 and the first piston member 228;
2 and the oil chamber 238 surrounded by the main body 230
These oil chambers 236 and 238 communicate with each other through a communication hole (not shown), and when hydraulic oil is supplied, the effective diameter of the input pulley is changed. The hydraulic drive device 220 with this configuration has two oil chambers 23
6,238, it is possible to obtain nearly twice the thrust compared to a hydraulic cylinder of the same diameter.

Further, a lubricating oil passage 24 is provided in the housing 204, the main body 230, and the first piston member 228.
0, a connecting oil passage 244 and a lubricating oil passage 242 are respectively formed, and lubricating oil is supplied from a hydraulic pump (not shown) to the lubricating oil passage 240 → bearing 202 → connecting oil passage 2
The lubricating oil is supplied to the bearing 202 and the combined surface of the outer peripheral wall 222 and the second piston member 232 through the lubricating oil passage 242 and the opening 246. Here, lubricating oil is supplied to the above combination surfaces by
The outer circumferential wall 222 is slightly deformed by the tension transmitted from the transmission belt 212 to the movable pulley 208, and this deformation is repeated as the pulley rotates. This is to prevent the mating surfaces with the piston member 232 from being slightly vibrated in the radial direction in a pressed state and from sticking to each other at the mating surfaces with the lubricating oil.

[Problem that the invention attempts to solve]

However, in the conventional configuration described above, since the connecting oil passage 244 of the main body 230 is approximately parallel to the axial direction of the rotating shaft 200, the lubricating oil discharged from the bearing 202 passes through the connecting oil passage 244 to the lubricating oil passage. 242, and therefore, there was a problem that lubricating oil was not sufficiently supplied to the above-mentioned mating surfaces.

[Means for solving problems]

The present invention, which was developed to solve the above problems, is a belt type continuously variable transmission in which a transmission belt is stretched between an input pulley and an output pulley, and the input pulley or the output pulley is connected to the housing. A rotating shaft rotatably supported via a bearing, a fixed pulley fixed to this rotating shaft, a movable pulley fitted to the rotating shaft so as to be movable in the axial direction but not rotatable around the axis, and this movable pulley. a hydraulic drive device that changes the effective diameter of the pulley by driving the movable pulley in the axial direction, and the hydraulic drive device for at least one of the input or output pulley extends from the outer periphery of the movable pulley parallel to the axis of the rotation shaft. a cylindrical outer circumferential wall protruding toward the side opposite to the transmission belt side; a cylindrical portion having one end fixed to the rotating shaft and formed in the axial direction; and a cylindrical portion extending from the other end of the cylindrical portion toward the outer circumferential side. a first piston member having a flange portion, the outer peripheral edge of the flange portion being slidably fitted inside the outer peripheral wall; and an outer peripheral surface of a cylindrical portion of the first piston member fixed to the rotating shaft. a cylindrical body with a bottom, which has a body base that comes into contact with the body and which fits the outer circumferential wall; an annular second piston member slidably fitted to the surface; a lubricating oil passage formed within the first piston member to guide lubricating oil to the mating surface of the outer peripheral wall and the second piston member; A belt having a connecting oil passage formed in the base of the main body and guiding lubricating oil discharged from the bearing to the lubricating oil passage, and wherein the connecting oil passage is inclined toward the outer circumferential side from the inflow side to the outflow side. This article focuses on continuously variable transmissions.

[Effect]

In the belt type continuously variable transmission of the present invention, by supplying and discharging hydraulic oil to the hydraulic drive device installed on the back of the movable pulley, the movable pulley slides in the axial direction of the rotating shaft, making the input and output pulleys effective. By changing the diameter, the driving force is transmitted steplessly.

Furthermore, lubricating oil is supplied to the bearing that supports the rotating shaft with respect to the housing, and to the combined surface of the outer circumferential wall formed on the movable pulley and the second piston member through the bearing → connection oil passage → lubricating oil passage. The connecting oil passage is formed to be inclined from the inflow side to the outflow side, that is, from the bearing side to the lubricating oil passage. Therefore, the lubricating oil discharged from the bearing and led to the connecting oil path receives centrifugal force from the connecting oil path inclined toward the outer circumference, and is guided in sufficient quantity to the lubricating oil path, and is supplied to the above-mentioned combination surface. be done.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

In FIG. 2, the power of an engine (not shown) is transmitted through a fluid coupling 10 and a belt-type continuously variable transmission (hereinafter referred to as
It's called CVT. ) 12, the signal is transmitted to the drive wheels connected to the drive shaft via an auxiliary transmission, an intermediate gear device, and a differential gear device (not shown).

The fluid coupling 10 includes a pump 24 connected to the crankshaft 22 of the engine, a turbine 28 fixed to the input shaft 26 of the CVT 12 and rotated by oil from the pump 24, and fixed to the input shaft 26 via a damper 30. A lock-up clutch 32 is provided. Lockup clutch 3
2 is activated when the vehicle speed or engine rotational speed exceeds a predetermined value, for example, to connect the crankshaft 22 and the input shaft 26.

The CVT 12 includes an input pulley 36 and an output pulley 38 provided on the input shaft 26 and the output shaft 34, respectively, and the input and output pulleys 36 and 38.
The transmission belt 40 is wound around the transmission belt 40. The input and output pulleys 36 and 38 are connected to the input shaft 26
A V groove is provided between fixed pulleys 42 and 44 fixed to the output shaft 34, and fixed pulleys 42 and 44 provided on the input shaft 26 and the output shaft 34, respectively, so as to be movable in the axial direction and non-rotatable relative to the axis. The movable pulleys 46 and 48 are moved by hydraulic cylinders 50 and 52 that function as the hydraulic drive device of this embodiment, thereby increasing the V-groove width, that is, the tension of the transmission belt 40. By changing the diameter (effective diameter), the gear ratio γ (rotational speed Nin of the input shaft 26/rotational speed Nout of the output shaft 34) of the CVT 12 is changed. The hydraulic cylinder 50 is operated mainly to change the gear ratio γ, and the hydraulic cylinder 52 is operated mainly to obtain the minimum clamping force within a range where the transmission belt 40 does not slip. The oil pump 54 constitutes a hydraulic power source for a hydraulic control device, which will be described later, and is connected to the crankshaft 22 by a connection shaft (not shown) that passes through the input shaft 26 vertically, and is constantly driven to rotate by the engine. .

Next, the surroundings of the hydraulic cylinder 50 will be explained in detail with reference to FIG.
The input shaft 26, which is integrated with the housing 60, is rotatably supported by the housing 60 via a bearing 62. A movable pulley 46 is fitted to the input shaft 26 so as to be slidable in the axial direction.
The above-mentioned hydraulic cylinder 50 is provided on the back of the vehicle. The hydraulic cylinder 50 includes a cylindrical outer circumferential wall 80 that protrudes from the outer circumference of the movable pulley 46 in parallel with the axis of the input shaft 26 toward the side opposite to the transmission belt 40 side.
and a cylindrical portion 82 whose one end is fixed to the input shaft 26.
and a flange portion 84 extending from the other end of the cylindrical portion 82 to the outer peripheral side, and the outer peripheral edge of the flange portion 84 is slidably fitted inside the outer peripheral wall 80. and the first piston member 8
A main body base 88 that comes into contact with the outer peripheral surface of the cylindrical portion 82 of No. 6
A, and a bottomed cylindrical main body 88 fixed to the input shaft 26, and a bottomed cylindrical main body 88 fixed to the tip of the outer peripheral wall 80, and the outer peripheral surface of the cylindrical part 82 of the first piston member 86 and the inner surface of the main body 88. It includes an annular second piston member 90 that is slidably fitted to the circumferential surface. This second piston member 90 is relatively positioned by a positioning pin 91 inserted into the outer circumferential wall 80, and is fixed to the outer circumferential wall 80 by a bolt (not shown).

In this hydraulic cylinder 50, the oil chamber 1 is surrounded by the movable pulley 46 and the first piston member 86.
04 and an oil chamber 106 surrounded by the second piston member 90 and the main body 88 are communicated through a communication hole (not shown).
When hydraulic pressure is supplied to 04 and 106, nearly twice the thrust can be obtained compared to hydraulic cylinders of the same diameter.

By the way, when the input shaft 26 rotates, it is inevitable that the combined surfaces of the outer circumferential wall 80 and the second piston member 90 vibrate slightly relative to each other in the radial direction under pressure, and due to this minute vibration, the outer circumferential wall 80
and the second piston member 90 are likely to stick together. In order to prevent this, a lubricating oil passage is formed on the above-mentioned combination surface, and this lubricating oil passage is further utilized to supply lubricating oil to the bearing 62. The lubricating oil passages include a lubricating oil passage 94 formed in the housing 60 and communicating with the bearing 62, a connecting oil passage 95 formed in the main body base 88A, and a lubricating oil passage formed in the first piston member 86. An oil passage 96 is provided.

Connection oil passage 9 formed in the main body base 88A
5 is formed to be inclined toward the outer peripheral side with respect to the rotating shaft 100, that is, it is formed to be inclined from the lubricating oil inflow side to the outflow side.

Further, an opening 96a is formed on the outer circumferential surface of the first piston member 86 of the lubricating oil passage 96 between the cylindrical portion 82 and the flange portion 84. moreover,
The lubricating oil flowing out from this opening 96a flows toward the outer circumferential side according to the centrifugal force and is supplied to the combined surface of the outer circumferential wall 80 and the second piston member 90, after which the lubricating oil is discharged to the outside. A communication hole (not shown) is formed. In addition, 100 is a sealing member for oil-tightly sealing the sliding fitting part,
102 is a plug for closing an opening formed during machining of the lubricating oil passage 92.

In the above configuration, lubricating oil is supplied to the bearing 62 and the joint portion of the outer circumferential wall 80 and the second piston member 90 through the following route. Lubricating oil from the hydraulic pump is supplied to the bearing 62 through the lubricating oil passage 94.
Lubricate. Further, the lubricating oil discharged from the bearing 62 is discharged from the opening 96a to the outer circumferential side of the first piston member 86 through the connecting oil passage 95 of the main body base 88A → the lubricating oil passage 96 within the first piston member 86, and is discharged from the opening 96a to the outer circumference side of the first piston member 86. The mating surfaces of wall 80 and second piston member 90 are lubricated. At this time, since the connecting oil passage 95 formed in the main body base 88A is inclined from the inflow side to the outflow side and toward the outer circumferential side, the lubricating oil is guided through the connecting oil passage 95 by centrifugal force. The lubricating oil is supplied to the lubricating oil path 96. Therefore, since the lubricating oil is sufficiently supplied to the combination surface through the lubricant path 96, it is highly effective in preventing sticking on the combination surface.

As described above, according to this embodiment, the outer peripheral wall 80
Since lubricating oil is supplied to the combined surface of the outer peripheral wall 80 and the second piston member 90 through the lubricating oil path, the combined surface of the outer circumferential wall 80 and the second piston member 90 is pressed to a predetermined pressure as the input pulley 36 rotates. Even if they slightly vibrate beneath each other, mutual adhesion can be effectively eliminated. Therefore, even if the working oil pressure of the oil chamber 106 is increased, the combination surface will not stick, so the working oil pressure can be increased, and a higher transmission torque capacity can be achieved.

Further, according to this embodiment, since the bearing 62 is forcibly lubricated in the middle of the lubricating oil path 94,
It has the advantage of efficiently arranging the lubricating oil passages and efficiently utilizing the lubricating oil.

As shown in FIG. 3, there is a protrusion 8 annularly protruding inside the outer race 62a of the bearing 62 at the end of the main body base 88A on the bearing 62 side.
8a, and the protruding portion 88a may form a seal portion in which the outer peripheral side of the oil passage between the protruding portions 88a becomes a labyrinth. As a result, even if the lubricating oil discharged from the bearing 62 is subjected to centrifugal force, it does not leak from the gap and is guided from the connecting oil passage 95 in the main body base 88A to the lubricating oil passage 96 of the first piston member 86.

[Effect of idea]

As explained above, according to the present invention, the hydraulic drive device that moves the movable pulley in the axial direction is provided integrally with the rotating shaft, and the components in the rotating hydraulic drive device are connected to the stationary lubricating oil path. In a continuously variable transmission equipped with an oil path for supplying lubricating oil, the oil path in the rotating hydraulic drive device is oriented from the inflow side to the outflow side and is inclined toward the outer circumference, thereby utilizing centrifugal force. Lubricating oil can be efficiently supplied to members within the hydraulic drive device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the vicinity of the input pulley of a belt-type continuously variable transmission according to an embodiment of the present invention, FIG. 2 is a skeleton diagram showing the belt-type continuously variable transmission, and FIG.
This figure is a sectional view showing a modification of FIG. 1, and FIG. 4 is a sectional view showing the vicinity of an input pulley of a conventional belt type continuously variable transmission. 12... Belt type continuously variable transmission, 26... Input shaft (rotating shaft), 36, 38... Input pulley, output pulley, 40... Transmission belt, 42, 44... Fixed pulley, 46, 48... Movable pulley, 50...Hydraulic cylinder, 52...Hydraulic cylinder, 62...Bearing, 80...Outer peripheral wall, 82...Cylindrical portion, 84
...Flange portion, 86...First piston member, 8
8... Main body, 88A... Main body base, 88a... Protrusion, 90... Second piston member, 91... Positioning pin, 94, 96... Lubricating oil path, 95... Connection oil path.

Claims (1)

[Claims for Utility Model Registration] A belt-type continuously variable transmission in which a transmission belt is stretched between an input pulley and an output pulley, wherein the input pulley or output pulley is rotatable relative to the housing via a bearing. a rotating shaft supported by the rotating shaft; a fixed pulley fixed to the rotating shaft; a movable pulley fitted to the rotating shaft so as to be movable in the axial direction and rotatable around the axis; and a hydraulic drive device for changing the effective diameter of the pulley by changing the effective diameter of the pulley, and the hydraulic drive device for at least one of the input or output pulley extends from the outer periphery of the movable pulley parallel to the axis of the rotary shaft opposite to the transmission belt side. It has a cylindrical outer circumferential wall protruding to the side, a cylindrical part whose one end is fixed to the rotating shaft and formed in the axial direction, and a flange part extending from the other end of the cylindrical part to the outer circumferential side. a first piston member in which the outer peripheral edge of the flange portion is slidably fitted inside the outer peripheral wall; and a main body base fixed to the rotating shaft and in contact with the outer peripheral surface of the cylindrical portion of the first piston member. a cylindrical body with a bottom that fits the outer circumferential wall; and a body fixed to the tip of the outer circumferential wall so as to be slidable on the outer circumferential surface of the cylindrical portion of the first piston member and the inner circumferential surface of the main body. a fitted annular second piston member; a lubricating oil passage formed in the first piston member to guide lubricating oil to the mating surface of the outer peripheral wall and the second piston member; and a bearing formed in the base of the main body. A belt-type continuously variable transmission, comprising: a connecting oil passage that guides lubricating oil discharged from the lubricating oil passage to the lubricating oil passage, and wherein the connecting oil passage is inclined from an inflow side to an outflow side and toward an outer circumferential side.