JP3038075B2 - Automatic transmission for automobile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission for an automobile, and more particularly to an automatic transmission for improving its operability and noise.

[0002]

2. Description of the Related Art In an automatic transmission for an automobile, as shown in FIG.
Normally, D (drive), 2, 1, N (neutral) and R (reverse) are provided as the travel ranges selected at 0, and mechanical coupling with the engine output shaft during parking cannot be obtained. P (parking) is set to ensure a proper braking action. Then, by selecting the parking range by the select lever, the parking pawl 42 interlocking with the select lever is engaged and locked with the parking gear 40 provided on the transmission output shaft system.

The order of the travel ranges in the select lever section is 1, 2, D, N, R, and P. The select lever 10 is manually operated by a manual plate 20 through a manual plate 20 of the hydraulic control valve 30. The port is connected to the valve 32, and each port is opened and closed according to the selected range, and the line pressure is supplied to necessary element valves in the hydraulic control valve 30.

Here, the line pressure from the port S is supplied to the circuit of the port M1 at the time of the D range, to the circuits of the ports M1 and M2 at the time of the 2 range, and to the circuits of the ports M1 to M3 at the time of the 1 range. , And in the R range, the line pressure is supplied to the circuit of the port M4.
In the N and P ranges, no line pressure is supplied to any of the ports M1 to M4, and the pressure of each port is drained. Note that the manual plate 20 is provided on the transmission side in order to accurately correspond to the manual valve 32 and the parking pole 42.
Is held at a predetermined position determined for each range.

The hydraulic control valve 30 further receives a control command according to the running state from the control unit 50, and receives a reverse clutch 60, a low / reverse brake 6
2 and the other fastening elements 64 are actuated for smooth shifting.

[0006]

When a vehicle equipped with the above-mentioned automatic transmission is parked, the select lever is operated from the R range to the P range. However, conventionally, when the selector lever 10 is pulled out of the P range position and is operated to another range for the next run from the parking state, there is a problem that the operation force of the select lever is heavy and an abnormal noise is generated. .

In the R range, a line pressure is supplied to the circuit of the port M4 to generate a so-called R (reverse) hydraulic pressure.
And the low / reverse brake 62 is operating.
Investigation into the cause of the above-mentioned problem shows that, when the select lever is operated from the R range to the P range, the R hydraulic pressure remains in the hydraulic pressure generation range HR0, as indicated by the broken line in FIG. The release of 60 etc. has not been completed yet,
It was found that this occurred due to the parking lock being applied in a state where the power train and the suspension system were elastically deformed by receiving the torque in the reverse direction. Since the torque corresponding to this deformation remains, the weight becomes heavy when the select lever is pulled out of the P range, and abnormal noise is generated due to a sudden return of the elastic deformation at the moment when the lock is released.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and has provided an automatic transmission for an automobile which can operate a select lever from a P range with a light operating force without generating abnormal noise by eliminating residual elastic deformation torque. The purpose is to do.

[0009]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a selector lever for manually selecting a travel range including reverse and parking, and a manual lever which is connected to the selector lever and takes a range position corresponding to the selected range. The reverse port is connected to the plate and the manual plate to open and close the hydraulic port of the hydraulic control valve.
And manual valve capable of generating a reverse hydraulic di, provided on an output shaft system when the parking range is selected by the select lever is connected with the manual plate
In an automatic transmission for a vehicle having a parking lock mechanism for locking a parking gear, when a selection operation to a parking range is performed, the reverse hydraulic pressure generation area and the parking lock area are between the reverse range position of the manual plate and the parking range position. It is characterized by being separated.

[0010]

[Function] When the selection lever is operated to select the parking range, the reverse hydraulic pressure generation area and the parking lock area are configured to be separated from each other, so that the power train and the suspension system no longer generate elastic deformation due to the reverse torque. Not. Therefore, the parking lock mechanism does not engage in the biased state, and is not biased at all when the select lever is pulled out of the parking range.

[0011]

1 and 2 show an embodiment of the present invention. In particular, FIG. 1 shows a range in which an R hydraulic pressure is generated between a reverse range position of a manual plate and a parking range position when a parking range is selected. And the parking lock area. In the hydraulic pressure generation range HR of the R hydraulic pressure, the release completion point TF at which the hydraulic pressure reaches the clutch release level is terminated and separated from the start point of the parking lock range HL, so that the hydraulic pressure generation region HR does not overlap with the parking lock range HL. It is assumed. For this reason, as shown by the solid line in FIG. 2, the interval between the R hydraulic pressure port M4 and the drain port M5 of the manual valve 32 is determined so that the drain start point TD of the R hydraulic pressure is earlier than that indicated by the broken line.

If the parking lock area HL is too narrow, the manual release of the manual plate 20 or the like makes it easy to release automatically.
The degree is taken. A switch (not shown) for turning on the range display lamp is also provided on the manual plate 20, but the range display lamp lighting area HA for the P range displayed in FIG. Are set to be shorter to the P position side so that the R range display is longer so that the lamps are lit from the beginning.

According to this embodiment having the above-described structure,
When the parking lock is started, the R hydraulic pressure has already dropped to the clutch release level and has passed the release completion point TF, so that the power train and the suspension system have no elastic deformation due to the reverse torque. Therefore, the parking gear 40 and the parking pawl 42 do not engage in a biased state, so that when selecting another range from the P range, the operation force does not become heavy and no abnormal noise is generated.

[0014]

As described above, according to the present invention, when selecting from the other range to the parking range, the reverse hydraulic pressure generation area and the parking lock area are separated from each other. At the time of locking, the power train and the suspension system are no longer elastically deformed by the reverse torque. Therefore, the parking lock mechanism does not engage in the biased state, and does not increase the operating force or generate noise when the select lever is pulled out of the parking range.

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between a reverse hydraulic pressure generation area and a parking lock area according to an embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a change in reverse hydraulic pressure and a parking lock.

FIG. 3 is a diagram showing the overall configuration of an automatic transmission for a vehicle.

[Explanation of symbols]

 Reference Signs List 10 Select lever 20 Manual plate 22 Detent spring 30 Hydraulic control valve 32 Manual valve 40 Parking gear 42 Parking pole 50 Control unit 60 Reverse clutch 62 Low / reverse brake 64 Other fastening elements S ports M1 to M5 ports HR, HR0 Hydraulic pressure generation range HL Parking lock area HAP range display lamp lighting area TD Drain start point TF Release completion point

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16H 59/00-61/12 F16H 61/16-61/24 F16H 63/40-63/48

Claims (1)

(57) [Claims] 1. A select lever which can manually select a travel range including reverse and parking, a manual plate which is connected to the select lever and takes a range position corresponding to the selected range, and which is connected to the manual plate, A manual valve that can open and close the hydraulic port of the hydraulic control valve to generate reverse hydraulic pressure in the reverse range, and is connected to the manual plate and output when the parking range is selected with the select lever
In an automatic transmission for a vehicle including a parking lock mechanism that locks a parking gear provided in a shaft system ,
An automatic transmission for a vehicle, wherein the reverse hydraulic pressure generation area and the parking lock area are separated between the reverse range position of the manual plate and the parking range position at the time of the selection operation to the parking range.