JPH02120517A - Lubricant amount control circuit of wet type clutch - Google Patents

Abstract

PURPOSE:To supply the most suitable amount of lubricant to a clutch by providing such constitution as to control an amount of lubricant with the working pressure of a wet type clutch so as to supply lubricant to this wet type clutch. CONSTITUTION:While a clutch 51 is in its engaged state, if clutch work oil pressure is applied to a lubricant amount control valve 52, a housing hole 523 becomes an orifice and lubricant is emitted into a clutch chamber and the amount of lubricant increases as oil pressure rises, but when it comes up to a certain pressure P1, the hole 522 of a spool 521 and the housing hole 523 are completely slipped off from each other to stop the flow of lubricant. Finally, at the time when the clutch is released, the clutch work pressure P is not generated inside a circuit 50 (P=0) and there is no power to compress the spool 521, and accordingly, lubricant is kept stopping.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lubricating oil amount control circuit for a wet clutch.
In particular, the present invention relates to a lubricating oil amount control circuit for a wet type clutch suitable for lubricating a one-socket type clutch installed in automobiles, industrial machinery, construction machinery, etc.

(Conventional technology) Conventionally, Y! Is the formula clutch lubrication system equipped with a relief valve in the lubrication circuit, so-called pressure control? For example, referring to the lubrication circuit diagram in FIG. The lubricating oil that reaches the relief pressure or higher is dropped from the drain circuit 42 into the lubricating oil reservoir 10 via the relief valve 41 installed in the main circuit 40, and the other lubricating oil is dropped into the lubricating oil reservoir 10 through the orifice 44 of the lubricating circuit 43. After lubricating the wet clutch 20, the lubricating oil is dropped from the drain circuit 21 into the lubricating oil reservoir lO. In addition, if another lubricating part 30 is provided, that part is also lubricated through the orifice 45,
Thereafter, the lubricating oil is similarly dropped into the lubricating oil reservoir 10 from the drain 31. The amount of lubricating oil in the wet clutch in such a configuration is set in accordance with the maximum amount of lubricating oil during engagement of the clutch that requires the most lubricating oil.

(Problems to be Solved by the Invention) However, such conventional pressure-controlled lubrication has the following disadvantage in that it does not satisfy the requirements for the amount of lubricating oil required in the wet clutch and other peripheral devices.

(1) The amount of lubricating oil after engagement of the clutch may be small. In other words, after the clutch is engaged, it is better to supply more lubricating oil to other devices such as gears and bearings.

(2) The amount of lubricating oil required when the clutch is released is also small. That is, when a large amount of lubricating oil is supplied to the clutch when the clutch is released, as in the conventional case, the lubricating oil is agitated by the rotation of the clutch and its surrounding parts, resulting in so-called clutch slip loss.

In view of these conventional problems, the present invention provides a wet clutch that can supply the optimum amount of lubricating oil to the clutch each time! The purpose is to provide an A-lubrication circuit.

(Means for Solving the Problem) In order to achieve the above objectives, γ! according to the present invention! The type clutch lubricating oil circuit is an unprecedented eight lubricating oil amount control circuit, and will be explained with reference to FIG.
The lubricating oil amount control circuit for a wet type clutch is characterized in that the operating pressure P of this wet type clutch 51 is used to supply lubricating oil to the lubricating oil amount Q of the wet type clutch 51 to control the amount Q of lubricating oil.

(Function) Whether the clutch is disengaged, engaged, or after engagement is determined by Y! It is possible to understand the magnitude and chronological order of the clutch operating pressure. Therefore, the configuration of the present invention is such that, for example, when the clutch is disengaged, the clutch operating pressure P is generally approximately zero (P=O), and when the clutch is engaged, the clutch operating pressure P is the above pressure (P=0
) and the clutch relief pressure Ps (0<P<Ps), and if the clutch operating pressure P then reaches the clutch relief pressure Ps, it indicates that the clutch has completed engagement. Ascertain the operating status of the clutch based on the magnitude and chronological order of the operating pressure, and use that clutch operating pressure P.
Control is performed to provide the optimum lubricating oil fftQ for the clutch.

(Embodiment) An embodiment of a lubricating oil amount control circuit for a wet clutch according to the present invention will be described in detail below with reference to FIGS. 1 to 5. As shown in the lubrication circuit diagram of FIG. 1, the first embodiment has a configuration in which a lubricating oil amount control circuit according to the present invention is added to the conventional lubrication circuit 40 of FIG. 6. In the figure C1, this lubricating oil amount control circuit is a lubricating circuit 53 that is added to the clutch hydraulic circuit 50 that supplies hydraulic oil to the clutch 51.
, a pilot circuit 54 additionally added to the clutch hydraulic circuit 50, a lubricating circuit 55 for the clutch, and a lubricating oil amount control valve, which is a two-bottom, three-position switching valve, connected to these three circuits 53, 54, and 55. 0, which is a circuit with a configuration comprising 52 and 52.
Next, as shown in the lubrication circuit diagram of FIG. 2, the second embodiment uses a conventional lubrication circuit 40 similar to the first embodiment.
However, unlike the first embodiment, this lubricating oil amount control circuit includes a pilot circuit 54 added to the clutch hydraulic circuit 50 and a lubrication circuit 46 added to the conventional lubrication circuit 40. This circuit includes a lubricating circuit 47 for the clutch, and a lubricating oil amount control valve 52, which is a two-bottom, three-position switching valve, connected to these three circuits 54, 46, and 47. Next, the effects of this embodiment will be explained based on a schematic clutch embodying the first embodiment shown in FIG. 3, and operation diagrams of the embodiment shown in FIGS. 4 and 5.

Figure 3 is a partially enlarged view of the lW type clutch, as shown in Figure 1.
The right part of the figure shows the clutch 51, the right part of the figure shows the clutch hydraulic oil inflow circuit 50, and the lower part of the figure shows the lubricating oil amount control circuit of the first embodiment (the numbers in the figure correspond to the numbers in FIG. 1), Clutch operating pressure P is applied to the spool 521 of the lubricating oil amount control valve 52.
When , the spring S is compressed as the pressure increases, and the hole 522 on the side of the spool 521 and the hole 523 on the housing
This structure controls the amount of lubricating oil by utilizing changes in the relative position with respect to the lubricating oil. To explain the operation, first, when the clutch is engaged, when the clutch operating hydraulic pressure is applied to the lubricating oil amount control valve 52, the hole 523 of the housing becomes an orifice and the lubricating oil is discharged into the clutch chamber, and as the hydraulic pressure increases. The amount of oil increases accordingly, but when it reaches a certain pressure P1, the spool 52
The hole 522 of the spool 521 and the hole 523 of the housing begin to shift, and the oil amount decreases (FIG. 1(a)). Then, when the clutch engagement is completed, the hole 522 of the spool 521 and the hole 523 of the housing completely align. The lubricating oil stops flowing.

((b) in the same figure).Finally, when the clutch is released, the clutch operating pressure P is not generated in the circuit 50.
(P-0), there is no force to compress the spool 521, and therefore the lubricating oil remains stopped. Since this example is an example of the first embodiment, it also includes a conventional lubrication circuit 40, and therefore, instead of lubricating oil from the conventional lubrication circuit 40 continuing to be supplied to the clutch. (Therefore, in the third and fourth embodiments, from the overall circuits of the first and second embodiments, the conventional lubrication circuit 4
(It may be a circuit with a configuration excluding 0) If 0 or more is shown using data obtained by mounting on an actual machine based on Figures 4 and 5,
The relationship between clutch operating pressure P and lubricating oil IQ is shown in Figure 4 (a).
), and the relationship between the operating time t and the clutch operating oil pressure P is as shown in FIG.
The relationship between Various other characteristics can also be used. The effects of this embodiment can be summarized as follows.

(1) The amount of clutch lubricating oil can be increased during clutch engagement, and the clutch can be sufficiently cooled and lubricated.

(2) The amount of clutch lubricating oil can be reduced when clutch engagement is completed, and surplus lubricating oil can be distributed to parts other than the clutch.

(3) The amount of clutch lubricating oil can be reduced when the clutch is released, and since the lubricating oil is no longer stirred by the clutch, clutch idle loss can be reduced.

(Effects of the Invention) As described above, the lubricating oil amount control circuit for a wet clutch according to the present invention can appropriately provide the amount of lubricating oil required by the clutch.

Moreover, as a result, it becomes possible to suppress clutch slip loss to a minimum, and furthermore, it becomes possible to provide surplus lubricating oil to other lubricating device parts.

[Brief explanation of drawings]

1 to 5 are diagrams for explaining a lubricating oil amount control circuit for a wet clutch according to the present invention, in which FIG. 1 is a diagram of a first embodiment, FIG. 2 is a diagram of a second embodiment, and FIG. The figure is an embodiment of a schematic clutch based on the first embodiment, FIGS. 4 and 5 are diagrams showing the operation of these embodiments, and FIG. 6 is a lubrication circuit diagram of a conventional wet clutch. 40... Lubrication circuit 50... Clutch hydraulic circuit 51... Clutch 52... Lubricating oil amount control valve 46.53... Lubrication circuit 54... Pilot circuit 47.55... Lubrication circuit to clutch P...Operating pressure Ps...Clutch engagement Q...5 Lubricating oil amount S・522・523・・Spring・Spool・Spool hole・Housing hole

Claims (1)

[Claims] A lubricating oil amount control circuit for a wet type clutch, characterized in that the lubricating oil amount is controlled by using the operating pressure of the wet type clutch to supply lubricating oil to the wet type clutch.