JPH058116U - Clutch lubrication circuit - Google Patents

Abstract

(57) [Summary] [Purpose] A specified amount of lubricating oil is sent only to the engaged clutch packs, and unnecessary lubrication is not applied to the disengaged clutch packs. [Structure] The transmission lubrication circuit 1 includes clutch port independent lubrication circuits 2A and 2B and other lubrication circuit 3
The clutch port independent lubrication circuits 2A and 2B are provided with three-position switching valves 4A and 4B including the neutral position to provide clutch port 1st speed, 2nd speed, 3rd speed, 4th speed, H (high speed), L Two-position switching valve 5A for speed change leading to (low speed) and R (reverse)
To 5C are connected, and the port 1 which requires lubrication immediately before any desired clutch is engaged is directly fed from any of the three-position switching valves 4A and 4B or through any of the two-position switching valves 5A to 5C.
The required amount of lubricating oil can be sent to any of high speed, second speed, third speed, fourth speed, H, L, and R by computer control. [Effects] Clutch idling loss horsepower can be reduced, which is particularly effective for transmissions with many clutch packs.
The amount of lubricating oil that is constantly stored can also be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for reducing clutch idling loss horsepower of an automatic transmission, and more particularly to a clutch lubrication circuit.

[0002]

[Prior Art]

 Conventionally, lubrication of clutches in automatic transmissions is always performed regardless of engagement, requiring a specified amount per disc area or more so that heat generated when the clutch is engaged is sufficiently cooled. ..

[0003]

[Problems to be solved by the device]

 However, despite the fact that there is a clutch that is not engaged at all, the specified lubrication oil is constantly flowing through each clutch pack because the lubrication circuit is the same, and the circulating lubrication oil is also possible. Becomes the amount. Accordingly, clutch idling horsepower is generated due to agitation resistance, etc. even in clutch packs that are unnecessarily lubricated, and this is one of the causes of increasing horsepower loss of the entire trans mission.

In view of this, the present invention sends a specified amount of lubricating oil only to the engaged clutch packs and does not perform unnecessary lubrication to the unengaged clutch packs. The purpose is to solve the drawbacks of the prior art by providing a lubrication circuit of the clutch that can reduce the total horsepower loss.

[0005]

[Means for Solving the Problems]

 As a means for solving the above problems of the prior art, the present invention separates the transmission lubrication circuit into a clutch port independent lubrication circuit and other lubrication circuits, and the clutch port independent lubrication circuit includes a neutral position. A three-position switching valve is provided and connected to a two-position switching valve for shifting which is connected to a clutch port, and lubrication is required from the three-position switching valve directly or through the two-position switching valve immediately before the desired clutch is engaged. It is characterized in that the required amount of lubricating oil can be sent to a specific port by computer control.

[0006]

[Action]

 According to the above construction, since the three-position switching valve has the neutral position, the port can be closed when lubrication is unnecessary and the lubricating oil can be sent only to the necessary port.

[0007]

【Example】

 FIG. 1 shows an embodiment of a clutch lubrication circuit of the present invention, and FIG. 2 shows a list of an example of lubrication at each speed stage.

Hereinafter, the present invention will be described with reference to the embodiments shown in FIGS. 1 and 2. The present invention separates the lubrication circuit 1 of the transmission into the clutch port independent lubrication circuits 2A and 2B and the other lubrication circuit 3, and the clutch port independent lubrication circuits 2A and 2B are switched between three positions including the neutral position. Valves 4A and 4B are provided to connect two-position changeover valves 5A, 5B and 5C for shifting to clutch ports 1st, 2nd, 3rd, 4th, H (high speed) L (low speed) and R (reverse), and desired. Immediately before the clutch is engaged, a port that needs lubrication from the 3-position switching valve 4 (either 4A or 4B) directly or via the 2-position switching valve 5 (5A, 5B or 5C). 1st, 2nd, 3rd, 4th, H, L, and R so that a required amount of lubricating oil can be sent by computer control (not shown).

As shown in FIG. 1, the transmission lubrication circuit 1 connected to the pump 6 includes clutch port independent circuits 2A and 2B (two in this embodiment) and other lubrication circuits 3 (for example, used for bearings, etc.). 3), the clutch port independent circuits 2A, 2B are provided with three-position switching valves 4A, 4B having three positions a, b, and c operated by solenoids, respectively. A two-position switching valve 5A having two positions a and b operated by a solenoid is provided downstream of the three-position switching valve 4A, and two a and b operated by a solenoid are also provided downstream of the three-position switching valve 4B. Two-position switching valves 5B and 5C each having a position are connected. The downstream side of the three-position switching valve 4A, two-position switching valve 5A, 5B, 5C is connected to R, H, L, 4th, 3rd, 2nd, 1st ports leading to the clutches of the transmission 7, respectively. ..

Next, the operation will be described. For example, as shown in FIG. 2, in the case of a transmission that vertically represents one reverse speed, neutral, and seven forward speeds, one of H (high speed) and L (low speed) and 4th, 3rd, Any one of the 2nd, 1st, and R (reverse) clutches are engaged as shown by the circles. That is, in the case of lubrication at the seventh forward speed (when combining H and 4th), in FIG. 1, the 3-position switching valve 4A is set to the c position, the 2-position switching valve 5A is set to the a position, and the 3-position switching valve 4B is set. By setting the position to the a position and the two-position switching valve 5B to the a position, the lubricating oil is sent from the pump 6 to the engaged clutch ports H and 4th through the circuits 2A and 2B. For the lubrication when switching from the 7th forward speed to the 6th speed, the lubricating oil is supplied to the clutch port L by switching the 2-position switching valve 5A to the b position in FIG. Therefore, while traveling, the two clutches of each speed stage out of the seven ports are always engaged, but the remaining five ports are not engaged, and lubrication is required. There is no. Also, due to the shifting pattern, some ports do not require lubrication. For example, in the case of shifting from the 2nd forward speed to the 3rd forward speed, the 2nd clutch remains engaged and only the H (high speed) port needs to be lubricated. That is, in the case of the second forward speed in FIG. 1, the 3-position switching valve 4A is in the c position, the 2-position switching valve 5A is in the b position, and the L port is in the 3-position. The position switching valve 5C was in the a position and was lubricated to the 2nd port, but in order to change to the forward third speed, the positions of the three position switching valve 4B and the two position switching valve 5C were not changed, Lubrication is switched to the H port by switching the 2-position switching valve 5A on the 3-position switching valve 4A side to the a position. Lubrication is no longer required by returning the three-position switching valves 4A, 4B to the c position (neutral) since lubrication is no longer required after the engagement of the clutch is completed. The switching operation of each of the three-position switching valve and the two-position switching valve is performed by computer control (not shown). In this way, since the change of the speed stage determines the optimum shift time, it is possible to predict which disk is engaged at what time, and this prediction ensures that the lubricating oil is supplied to the disks that require lubrication.

Although the embodiment of the present invention has been described as applied to a clutch of an automatic transmission, it goes without saying that the same effect can be obtained by applying it to a clutch having a similar mechanism. No, the scope is not limited to the transmission clutch.

[0012]

[Effect of the device]

 As described above, the present invention separates the transmission lubrication circuit into a clutch port independent lubrication circuit and other lubrication circuits, and the clutch port independent lubrication circuit is provided with a three-position switching valve including a neutral position. It is connected to a two-position switching valve connected to a clutch port for speed change, and immediately before the desired clutch is engaged, the three-position switching valve directly or via the two-position switching valve to a port that requires lubrication is used as a computer. -Since the required amount of lubricating oil can be sent by torque control, the clutch idling horsepower is reduced, and therefore the horsepower loss of the trans mission can be reduced. This is especially effective for transmissions with many clutch packs, and the amount of lubricating oil that is constantly stored can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a lubricating circuit showing an embodiment of a lubricating circuit for a clutch according to the present invention.

2 is an explanatory view showing a relationship between a speed stage of a transmission to which the present invention is applied and a clutch port of FIG.

[Explanation of symbols]

 1 Lubrication circuit 2 Clutch port independent lubrication circuit 3 Other lubrication circuits 4A, 4B 3 position switching valve 5A, 5B, 5C 2 position switching valve

Claims (1)

[Claims for utility model registration] [Claim 1] The lubrication circuit of the transmission is divided into a clutch port independent lubrication circuit and other lubrication circuits,
The clutch port independent lubrication circuit is provided with a 3-position switching valve including a neutral position to connect to the clutch port for speed change.
Immediately before the desired clutch is engaged, connected to the position switching valve,
A lubricating circuit for a clutch, characterized in that a necessary amount of lubricating oil can be sent from the 3-position switching valve directly or via a 2-position switching valve to a port requiring lubrication by computer control.