Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1988-03-01
1989-10-24
Wright, Dirk
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
B60K 4116
Patent
active
048753920
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a manual valve which is shortened axially, and suitable for an automatic transmission for an automobile particularly to a F.F. (front engine, front drive) mounted small type car.
2. Description of the Prior Art
A manual valve in an automatic transmission has a spool comprising a cylindrical "land" portion and a circular "groove" portion, and ports for forward running and a port for reverse running which are located in the same axial direction along a port for line pressure application.
As shown in FIG. 12, a previously proposed manual valve V' has an oil chamber 5'a in a connecting area, so that the distance between a port R and a port D is shortened; however, a port P.sub.L for a line pressure application is still located between the port for reverse running (R) and the ports for forward running (D, 3, 2 and 1). Due to the above, a certain length is necessary from the port for line pressure application P.sub.L to both the port R for reverse running and ports D, 3, 2 and 1 for forward running particularly port 1, so that the case or valve body where each port is located becomes long axially, so that a large space is required.
In particular, recently due to the requirements of front-engine-front-drive and high efficiency, an automatic trnsmission has been required to be small sized and be a multiple-speed transmission. Under such circumstances, in such a small sized and multiple-speed transmission, a shortened manual valve is required because the installation space in a trans axle case is limited.
The present invention proposes to shorten the manual valve by setting the ports for forward running and the port for reverse running in the same axial direction from the port for line pressure application.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a manual valve which comprises: a port for reverse running and ports for forward running in the same axial direction from a port for line pressure application; a spool having a first oil chamber connecting the line pressure application port and each forward running port; a second oil chamber connecting the reverse running port and the line pressure application port, or a drain portion; and a drain path connecting each forward running port and the drain portion.
Based on the structure described above, when a vehicle runs forward, the spool will be positioned corresponding to one of the forward running ports of the manual valve, line pressure from the line pressure application port is applied to the ports corresponding to each forward speed through the first oil chamber.
When a vehicle runs in reverse, the spool is positioned corresponding to the reverse running port of the manual valve, and line pressure from the line pressure application port is applied to the reverse port through the second oil chamber.
As explained, the present invention shows that, in the manual valve, the ports for forward running and the ports for reverse running are positioned in the same axial direction from the port for line pressure application, so that the overall length, particularly the area where the ports are located, is shortened.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic cross sectional view of a manual valve according to the present invention;
FIG. 2 is an overall cross sectional view of the manual valve of FIG. 1;
FIG. 3 is a plan view of a trans axle case in which the manual valve of FIG. 2 is installed;
FIGS. 4-10 are schematic views showing the positions of the manual valve for various drive conditions;
FIG. 11 is a cross sectional view of another embodiment of the valve of the present invention; and
FIG. 12 is a cross sectional view of a previously proposed valve.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The following is a description of an embodiment of a valve in accordance with the present invention.
A manual valve V installed in a trans axle case shown in FIG. 3 is used for a small and multiple speed automatic transmission par
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patent: 4754666 (1988-07-01), Inagaki
Kuwayama Yoshinari
Miura Masakatsu
Yokoyama Fumitomo
Aisin-Warner Kabushiki Kaisha
Wright Dirk
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