JPH0522426Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a driving force distribution clutch device for a vehicle, which is used as a transfer clutch device, differential limiting clutch device, etc. of a four-wheel drive vehicle.

(Prior Art) Conventionally, multi-plate friction clutches for automatic transmissions have been described, for example, on page 222 of "Automotive Engineering Complete Book Volume 9: Power Transmission Device" (November 1980, published by Sankaido Co., Ltd.) Those described in are known.

This multi-disc friction clutch supplies lubricating oil to the clutch portion using an oil pump provided on the engine output shaft.

(Problem that the invention seeks to solve) However, in multi-disc friction clutches for automatic transmissions, lubricating oil is supplied to the clutch using an oil pump installed on the engine output shaft, which does not change the direction of shaft rotation. There is no problem when supplying lubricating oil, but if the lubricating oil is applied directly to a transfer clutch etc. where the engine driving force that has passed through the transmission is input, even if lubricating oil can be supplied when moving forward, the oil pump will reverse when moving backward. , suction and discharge are reversed, making it impossible to supply lubricating oil.

For this reason, if the multi-plate friction clutch is kept engaged for a long time when reversing the vehicle, a problem arises in that the plates may seize or be damaged due to frictional heat between the drive plate and the driven plate.

(Means for solving the problem) The present invention was made with the purpose of solving the above-mentioned problems. A multi-plate friction clutch is installed at a position where it can distribute the power to the front and rear wheels or left and right wheels, and is tightened by a pressing mechanism operated by externally controlled hydraulic pressure. A driving force distribution clutch device for a vehicle comprising a lubricating pump that sucks up lubricating oil for clutch cooling in a clutch case and guides the lubricating oil to an inner position of a multi-disc friction clutch, wherein an external position of the multi-disc friction clutch is
A lubricating oil gutter is provided to receive lubricating oil scattered by centrifugal force, stirring, etc., and a circulation oil path is formed to guide lubricating oil from the lubricating oil gutter to an inner position of the multi-disc friction clutch. The means is characterized in that a check ball is provided between the lubricating oil gutter and the circulating oil path to allow only the flow from the lubricating oil gutter to the circulating oil path.

(Function) When moving forward, the lubrication pump operates in the forward rotation direction.
The lubricating oil accumulated inside the clutch case is guided to the inside of the multi-disc friction clutch to cool the multi-disc friction clutch and surrounding torque transmission parts.

At this time, the check ball moves toward the lubricating oil gutter and blocks the passage due to the pressure difference between the high pressure circulating oil passage and the low pressure lubricating oil gutter. Therefore, during forward movement, lubricating oil will not leak from the lubricating oil gutter to the circulation oil path.

When moving backward, the lubrication pump operates in the reverse direction, so the flow of lubricating oil is opposite to that when moving forward, and the multi-disc friction clutch is not supplied with lubricating oil depending on the supply from the lubrication pump.

However, the lubricating oil gutter receives lubricating oil scattered by centrifugal force, stirring, etc., and since the check ball has an open passage, the lubricating oil is circulated from the lubricating oil gutter through the circulation oil path and is It is guided to the inner side of the plate friction clutch and cools the multi-plate friction clutch and surrounding torque transmission parts.

Therefore, lubricating oil can be supplied to the multi-disc friction clutch both when moving forward and when moving backward.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In describing this embodiment, a transfer clutch device for a four-wheel drive vehicle will be taken as an example.

First, the configuration will be explained.

As shown in FIG. 4, a four-wheel drive vehicle to which the transfer clutch device A of the embodiment is applied includes an engine 1, a transmission 2, a transfer input shaft 3, a rear propeller shaft 4, and a rear differential. 5. It is equipped with a rear wheel 6, a transfer output shaft 7, a front propeller shaft 8, a front differential 9, and a front wheel 10, and the engine driving force that has passed through transmission 2 is directly transmitted to the rear wheel 6. The power is transmitted to the front wheels 10 via a transfer clutch device A provided between the transfer input and output shafts 3 and 7.

The transfer clutch device A, as shown in FIG. is provided in the clutch case 11 when the shaft rotates in the normal direction.
and a lubricating pump 70 that sucks up lubricating oil o for clutch cooling inside the case cover 12 and guides the lubricating oil o to a position inside the multi-plate friction clutch 60.

The hydraulic control device 20 includes a relief switch 2
1, a hydraulic pump 24 that is operated by the motor 22 to draw water from the reservoir tank 23, and the hydraulic pump 24.
An accumulator 26 stores the pump discharge pressure (primary pressure) from the pump via a check valve 25, and an electromagnetic device adjusts the line pressure (secondary pressure) from the accumulator 26 to a predetermined control oil pressure Pc according to a command from the control unit 27. The hydraulic pressure is supplied to the control hydraulic boat 30 via a control hydraulic pipe 29.

The control unit 27 has an electronic control circuit configuration, includes a front wheel rotation speed sensor 31, a rear wheel rotation speed sensor 32, etc. as information input sensors, and outputs a control oil pressure generation command according to the difference in front and rear wheel rotation speeds. That's what I do.

The pressing mechanism 40 of the multi-plate friction clutch 60 includes a cylinder block 41, a piston chamber 42,
It includes a piston 43, a piston rod 44, a swing plate 45, a swing pin 46, a fixed pressure plate 47, a bearing 48, a rotating pressure plate 49, a pressure block 50, and a return spring 51.

The multi-plate friction clutch 60 includes a clutch drum 61 spline-coupled with the transfer input shaft 3.
, a drive plate 62 spline-fitted to the clutch drum 61 side, and a driven plate 63 sandwiched between the drive plates 62;
spline fitting the driven plate 63,
A clutch hub 65 rotatably supported by a needle bearing 64 is provided for the transfer input shaft 3.

In addition, from the clutch hub 65, the first sprocket 66 → chain 67 → second sprocket 6
8, the driving torque is transmitted to the transfer output shaft 7.

The lubrication pump 70 is connected to the transfer input shaft 3
It is a trochoid pump type installed in a pump housing 71 and a pump cover 72 at the inlet part of the pump, and its suction port 73 communicates with a suction tube 75 having a suction port 74, and its discharge port 76 communicates with a suction tube 75 having a suction port 74. A radial oil passage 77, an axial oil passage 78, and a radial oil passage 79 formed in the input shaft 3 and an oil hole 8 formed in the clutch hub 65.
0,81, and clutch case 1 is connected when the shaft rotates in the normal direction.
The lubricating oil o for clutch cooling in the clutch 1 is sucked up and guided to the multi-disc friction clutch 60.

The outer position of the multi-plate friction clutch 60 receives lubricating oil o that passes through the oil hole 82 of the drive plate 61 and is scattered by centrifugal force, or that receives lubricating oil o that is scattered by stirring by the chain 67. An oil garter 83 is provided, and a circulation oil passage 84 is formed between the transfer input shaft 3 and the driven plate 65 for guiding lubricating oil o from the lubricating oil garter 83 to an inner position of the multi-plate friction clutch 60. , passage 85 of lubricating oil gutter 83 and circulation oil passage 84
A check ball 86 is provided between the lubricating oil gutter 83 and the circulating oil passage 84 to allow the flow thereof only.

In addition, FIG. 2 is an enlarged view of the part in FIG. 1, and 87 is a pin that supports the check ball 86 so that it does not fall.
88 is a ball bearing seal. Also,
FIG. 3 is a cross-sectional view taken along the line in FIG.
is drilled.

In addition, in Fig. 1, 90 is a joint flange, 91, 9
2,93 is a seal, 94,95,96,97,9
8 is a bearing.

Next, the effect will be explained.

(a) When moving forward When moving forward, the lubrication pump 70 operates in the forward rotation direction in response to the rotation from the transfer input shaft 3, and the lubricating oil o accumulated inside the transfer case 11 is pumped from the suction port 74 to the suction port 74. tion tube 75 → suction port 73 → lubrication pump 70 → discharge port 76
→ Radial oil passage 77 → Axial oil passage 78 → Radial oil passage 79 → Oil hole 80 → Passing through oil hole 81, the torque is guided to the inside of the multi-disc friction clutch 60, and the torque around the multi-disc friction clutch 60 and around it is guided. Cool the transmission part.

At this time, the check ball 86 moves toward the lubricating oil gutter 83 and blocks the passage 85 due to the pressure difference between the high pressure circulating oil passage 84 and the low pressure passage 85 of the lubricating oil gutter 83. Therefore, when moving forward, lubricant oil is transferred from the lubricant gutter 83 to the circulation oil path 84.
will not leak.

(B) When moving backward When moving backward, the lubrication pump 70 operates in the reverse direction in response to the rotation from the transfer input shaft 3, so the flow of lubricating oil O is opposite to that when moving forward, and the flow of lubricating oil o is reversed to the supply from the lubrication pump 70. Therefore, the multi-plate friction clutch 60 is not supplied with lubricating oil o.

However, the lubricating oil gutter 83 receives the lubricating oil o that passes through the oil hole 82 of the drive plate 61 and is scattered by centrifugal force, and the lubricating oil o that is scattered due to stirring by the chain 67, etc. falls due to its own weight and opens the passage 85, so the lubricating oil o is transferred from the lubricating oil gutter 83 to the passage 8.
5→circulation oil passage 84→oil hole 80→oil hole 81, and is led to the inside position of the multi-plate friction clutch 60 to cool the multi-disc friction clutch 60 and surrounding torque transmission parts.

As explained above, in the transfer clutch device A of the embodiment, the lubricating oil o can be supplied to the multi-disc friction clutch 60 both during forward movement and during backward movement, and thereby the multi-disc friction due to the engagement during backward movement is achieved. Failure of the clutch 60 can be prevented.

Although the embodiment has been described above based on the drawings, the specific configuration is not limited to this embodiment, and any design changes that do not depart from the gist of the present invention are also included in the present invention. .

For example, in the example, an example of application to a transfer clutch device for a four-wheel drive vehicle was shown, but the patent application
It can also be applied to differential limiting clutch devices such as No. 59-187780 that control differential limiting force using externally controlled hydraulic pressure.

(Effects of the invention) As explained above, in the vehicle driving force distribution clutch device of the invention, the lubricating oil scattered by centrifugal force, stirring, etc. is received at the outer position of the multi-plate friction clutch. In addition to providing a lubricating oil gutter,
A circulating oil passage is formed for guiding lubricating oil from the lubricating oil gutter to an inner position of the multi-plate friction clutch, and only flow from the lubricating oil gutter to the circulating oil passage is allowed between the lubricating oil gutter and the circulating oil passage. Since this means is characterized by the provision of a check ball, lubricating oil is supplied to the multi-plate friction clutch both when moving forward and when reversing, and it is possible to prevent failure of the multi-disc friction clutch due to engagement when reversing. is obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a transfer clutch device according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the part in Fig. 1, Fig. 3 is a sectional view taken along the line of Fig.
The figure shows a drive system of a four-wheel drive vehicle to which the transfer clutch device of the embodiment is applied. A... Transfer clutch device (driving force distribution clutch device for vehicles), 3... Transfer input shaft, 7... Transfer output shaft, 11... Transfer case (case), 20... Hydraulic control device,
40... Pressing mechanism, 60... Multi-plate friction clutch,
70... Lubricating pump, 83... Lubricating oil gutter, 8
4...Circulation oil path, 86...Check ball, o...
…Lubricant.

Claims (1)

[Scope of Claim for Utility Model Registration] A multi-disc friction clutch that is installed at a position that can distribute the engine driving force that has passed through the transmission to the front and rear wheels or left and right wheels, and that is engaged by a pressing mechanism operated by externally controlled hydraulic pressure. , a lubrication pump that is installed on the input shaft side of the engine driving force, sucks up lubricating oil for clutch cooling in the clutch case when the shaft rotates in the normal direction, and guides the lubricating oil to the inner position of the multi-disc friction clutch. In the force distribution clutch device, a lubricating oil gutter is provided at an outer position of the multi-plate friction clutch to receive lubricating oil scattered by centrifugal force, stirring, etc., and a lubricating oil gutter is provided at an inner position of the multi-plate friction clutch from the lubricating oil gutter to an inner position of the multi-plate friction clutch. A vehicle drive characterized in that a check ball is provided between the lubricating oil gutter and the circulating oil path, forming a circulating oil path for guiding lubricating oil, and allowing flow only from the lubricating oil gutter to the circulating oil path. Force distribution clutch device.