JPH04138154U - Vehicle wet clutch lubrication system - Google Patents

Abstract

(57) [Summary] [Purpose] To always supply an appropriate amount of oil to the wet clutch regardless of the engine speed and maintain the wet clutch in an optimal lubrication state. [Structure] Oil is sent from a hydraulic pump 15 driven by an engine 2 to a control valve device 9 for power steering, and the return oil is supplied to a wet clutch 21 through a lubrication circuit 20 branched from a drain circuit 18. A check valve 22 is installed downstream of the branched portion of the drain circuit 18, and by opening and closing the check valve 22, the divided flow rate to the wet clutch 21 is controlled to be substantially constant.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a wet clutch lubrication system for vehicles such as tractors.

0002

[Conventional technology]

In vehicles such as tractors, the main clutch is installed between the engine and the transmission. While a wet clutch is adopted as a clutch, a control valve device for power steering The oil returned to the oil tank is supplied to the wet clutch for lubrication. There is something.

0003

[Problem that the idea aims to solve]

If the return oil is used to lubricate the wet clutch in this way, the wet clutch will It can be cooled and prevent seizing, and at the same time, a special hydraulic pump for lubrication is used. It is very convenient as it does not require any additional tools. However, if the entire amount of return oil is supplied to the wet clutch, the amount of oil supplied will be excessive. There is a problem in that the torque becomes large and the entraining torque becomes large.

0004 Therefore, in general, a lubrication circuit is connected to a branch from the drain circuit, and the return oil is A portion of the oil is supplied to the wet clutch for lubrication. However, in this case, the discharge amount of the hydraulic pump increases depending on the engine rotation speed. When the engine rotates at low speed, the amount of water diverted to the lubrication circuit is insufficient. Conversely, there is a problem of insufficient lubrication.

[0005] In view of these conventional problems, the present invention has been developed to constantly operate a wet system regardless of the engine speed. Supplies the appropriate amount of oil to the clutch and maintains the wet clutch in optimal lubrication. The purpose is to do so.

[0006]

[Means to solve the problem] This invention supplies oil from a hydraulic pump 15 driven by an engine 2 to a required hydraulic machine. The return oil from this hydraulic equipment 9 is branched from the drain circuit 18 to be moistened. For a vehicle's wet clutch lubrication system that supplies lubrication to the formula clutch 21. A wet clutch is installed downstream of the branch of the drain circuit 18 to the wet clutch 21. The flow rate control valve 22 controls the flow rate so that the divided flow rate of oil to the channel 21 side is approximately constant. It is an intervention.

[0007]

[Effect]

There is a flow control valve 22 downstream of the branch part of the drain circuit 18, which controls the wet type clamp. The amount of oil diverted to the switch 21 side is controlled to be approximately constant. Therefore, the rotation speed of engine 2 Even if the discharge amount of the hydraulic pump 15 changes depending on the amount, the amount of oil drained changes. The wet clutch 21 is always optimally lubricated regardless of the engine speed. can be maintained in the same condition.

[0008]

【Example】

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In Figure 2, 1 is a truck engine 2, clutch housing 3, transmission case 4, etc. It is made by joining in the direction. 5 is a front wheel, and 6 is a rear wheel. 7 is the hood, 8 is the handle The control valve device 9 for power steering shown in Fig. 1, the power cylinder 10, etc. The vehicle is designed to operate the front wheels 5 by steering the vehicle.

[0009] 11 is the hydraulic system for lifting and lowering the work equipment, 12 is the rear wheel fender, and 13 is between the rear wheel fenders. 14 is a seat placed on the floor cover 13. As shown in Figure 1, one side of engine 2 has a power source driven by it. A hydraulic pump 15 for tearing is provided. Hydraulic pump 15 is a mission case. The gear oil 17 in the tank 4 is sucked in through the suction pipe 16, and the oil is supplied to the control valve. This is for supplying power to the power cylinder 10 via the power supply 9.

0010 A drain circuit 18 is connected to the control valve device 9, and the open end of this drain circuit 18 is connected to the drain circuit 18. Spray the return oil against the rear wheel differential device 19 installed at the rear inside the cushion case 4. It is designed to be attached. A lubrication circuit 20 is branched and connected to the drain circuit 18. This lubrication circuit 20 is a disc of a wet clutch 21 built into the clutch housing 3. A portion of the oil returns to the tank and is supplied for lubrication. Also the drain Circuit 18 has a check valve as a flow control valve downstream of the branch to lubrication circuit 20. A valve 22 is installed. Check valve 22 bows against the spring due to upstream pressure. It has the function of adjusting the flow rate by pushing the check valve 22 open. The opening/closing operation causes the oil to flow so that the amount of oil diverted to the wet clutch 21 side is approximately constant. Control quantity.

[0011] As shown in Figure 3, the middle part of mission case 4 is smaller than the height in the vertical direction. The width in the left and right direction is large, and inside this is a running system with a large number of gears 23. A transmission 24 for shuttles, etc., and a PTO system transmission shaft 25 are installed side by side on the left and right. There is. A gear 23 of the transmission 24 is connected between the transmission 24 and the transmission shaft 25. A baffle plate 26 is installed to prevent the gear oil 17 from being scooped up and shifting toward the transmission shaft 25. It is provided. Therefore, the gear oil 17 is not biased and the transmission 24 sinks. It can sufficiently lubricate the locone etc.

0012 According to the above configuration, the engine 2 rotates at a low speed and the discharge amount of the hydraulic pump 15 is small. If so, the check valve 22 of the drain circuit 18 remains closed and the entire amount of return oil is hydrated. It is supplied to the wet clutch 21 via the slip circuit 20. Also, engine 2 rotates at high speed, When the discharge amount of the hydraulic pump 15 becomes large enough, the check valve 22 of the drain circuit 18 is pushed wide. The lubrication circuit 20 is connected to the wet clutch 21 because it opens according to the flow rate at that time. A certain amount of oil is diverted, and the increased amount of oil is drained through check valve 22. go.

[0013] Therefore, regardless of the engine speed, the wet clutch 21 always has an appropriate amount of oil. The wet clutch 21 can be maintained in an optimal lubrication state and its durability can be improved. The open end of the drain circuit 18 is opened above the saucer 28 as shown in FIG. After receiving the oil in the saucer 28, it is applied to each gear part of the transmission 29, the rear wheel differential device 19, etc. Alternatively, the oil may be sprayed from each supply hole 30. In this case, the saucer 28 is filled with oil. It is appropriate to provide it below the pressure device 11.

[0014] Note that the hydraulic equipment may be other than the control valve device for power steering9. Also, a relief valve may be used in place of the check valve 22.

[0015]

[Effect of the idea]

According to the present invention, on the downstream side of the branch part of the drain circuit 18 to the wet clutch 21, Flow rate that controls the flow rate so that the divided flow rate of oil to the wet clutch 21 side is approximately constant. Since the control valve 22 is installed, the appropriate amount of oil is always available regardless of the engine speed. can be supplied to the wet clutch 21 to maintain the wet clutch 21 in an optimal lubricated state.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a side view of the same tractor.

FIG. 3 is an enlarged view taken along the line A-A in FIG. 2;

FIG. 4 is a configuration diagram showing another embodiment of the present invention.

[Explanation of symbols]

1 Tractor body 2 engine 9 Control valve device 15 Hydraulic pump 18 Drain circuit 20 Lubrication circuit 21 Wet clutch 22 Check valve (flow control valve)

Claims (1)

[Scope of utility model registration request] [Claim 1] Oil is sent from a hydraulic pump (15) driven by an engine (2) to a required hydraulic device (9), and the return oil from this hydraulic device (9) is branched from a drain circuit (18). In a vehicle wet clutch lubricating system that supplies lubrication to a wet clutch (21), a drain circuit (1
A flow control valve (22) is installed on the downstream side of the branch part to the wet clutch (21) in 8) to control the flow rate so that the divided flow of oil to the wet clutch (21) side is approximately constant. A vehicle wet clutch lubrication device characterized by: