JPH09257129A - Separate plate of control valve for automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a structure with a favorable seal property, hardly to generate the faulty operation of an automatic transmission at a low cost. SOLUTION: Separate plates 4a, 4b are held between the end surfaces of control valve bodies 3a, 3b, 3c mutually. A seal layer is formed only on the part, which is one of the separate plates 4a, 4b, contacted to the upper surface or lower surface of respective control valve bodies 3a, 3b, 3c. A small piece of an elastic material is prevented the mixing into ATF by that the elastic material for constituting this seal layer is not exposed to ATF. The force per unit area for push-pressing this seal layer is enlarged by limiting the area of the seal layer.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The separate plate of the control valve for an automatic transmission according to the present invention is used in a state where it is incorporated in a control valve of a planetary gear type automatic transmission.

[0002]

2. Description of the Related Art A planetary gear type automatic transmission is provided with a plurality of planetary gear mechanisms, and a gear ratio is converted by fixing or rotating a ring gear incorporated in each planetary gear mechanism. . Locking and unlocking of each ring gear is performed by controlling the supply / discharge condition of pressure oil to / from the wet multi-plate clutch. Therefore, the planetary gear type automatic transmission incorporates a control valve for controlling the supply / discharge condition of the pressure oil to / from the plurality of wet type multi-plate clutches. FIG. 1 is a schematic side view showing a state where a control valve 2 is assembled to a transmission main body 1. The control valve 2 is coupled and fixed to the lower surface of the transmission main body 1 with a bolt (not shown), and is further covered with an oil pan (not shown). Therefore, the control valve 2 is immersed in the automatic fluid (ATF) stored in the oil pan. The control valve 2 as described above changes the supply / discharge condition of the pressure oil to / from the wet multi-plate clutch according to the driving condition of the automobile, and changes the shift condition of the transmission main body 1.

As shown in FIG. 2, for example, the control valves 2 that fulfill such a role have a plurality (three in the illustrated example) of control valve bodies 3a, 3b, 3 as shown in FIG.
c and one to a plurality of (two in the illustrated example) separate plates 4a and 4b are superposed. Of these, the control valve bodies 3a, 3
b and 3c are made by casting an aluminum alloy, for example. A labyrinth-shaped oil passage (control) is formed on the lower surface of the control valve body 3a located at the upper stage, the upper surface of the control valve body 3c located at the lower stage, and the upper and lower surfaces of the control valve body 3b located at the middle stage. Only part of the valve body 3c is open). The end faces of the partition walls that partition these oil passages are present on the same plane of the lower surface, upper and lower surfaces, and upper surface of the control valve bodies 3a, 3b, 3c.

The separate plates 4a and 4b are also provided.
Is a flat plate made of a metal such as aluminum alloy, which matches the lower surface shape of the upper control valve body 3a, the lower surface shape of the middle control valve body 3b, and the upper surface shape of the lower control valve body 3c. It is made in the shape of. A plurality of through holes 5, 5 having various sizes and shapes are formed in a part of each of the separate plates 4a, 4b, and the control valve bodies 3a, 3b, 3 adjacent to each other in the vertical direction are formed.
The oil passages of c are freely communicated with each other. The control valve 2 formed by superposing the control valve bodies 3a, 3b, 3c and the separate plates 4a, 4b on the ATF to the transmission body 1 according to the switching of the solenoid valve installed in the oil passage. The feeding / discharging state is switched to change the gear ratio of the transmission main body 1.

Each of the control valve bodies 3a,
A sealing material is interposed between the overlapping surfaces of 3b, 3c and the separate plates 4a, 4b to prevent ATF from leaking from the respective combining surfaces. For this reason, conventionally, a packing formed in a shape matching the lower surface shape of the upper control valve body 3a, or the lower surface shape of the middle control valve body 3b and the upper surface shape of the lower control valve body 3c is used for the above-mentioned mating surfaces. It is sandwiched between the two or is disclosed in Japanese Patent Laid-Open No. 61-1099.
As described in Japanese Patent Publication No. 69 and Japanese Utility Model Publication No. 61-123262, a layer of a sealing material is provided on the upper and lower surfaces of each of the separate plates 4a and 4b over the entire surface thereof.

[0006]

If a packing independent of the separate plates 4a and 4b is used to seal between the mating surfaces, the number of parts increases, resulting in parts machining, parts management, and assembly. The work becomes troublesome,
Control valve 2 and this control valve 2
The cost of the planetary gear type automatic transmission incorporating is increased. Further, if a layer of the sealing material is provided on the upper and lower surfaces of each of the separate plates 4a and 4b over the entire surface of each surface, not only the amount of the sealing material used increases, but the cost increases.
There is a possibility that debris of the sealing material may be mixed into the ATF.
That is, when a layer of the sealing material is provided on the entire surface, a part of the layer of the sealing material is used for the control valve bodies 3a, 3
The layer of the sealing material is easily peeled off by being exposed to the flow of ATF flowing in the oil passages b and 3c. Then, when peeled off, there is a possibility that a small piece of the sealing material generated by this peeling may be mixed in the ATF. Like this ATF
The small pieces mixed therein are not preferable because they cause clogging of the fine flow passages in the control valve 2 and the transmission main body 1 and cause malfunction of the control valve 2 and the transmission main body 1. Further, the end faces of the control valve bodies 3a, 3b, 3c and the separate plates 4 are
Since the area of the sealing material sandwiched between a and 4b is large,
The force for pressing the sealing material per unit area becomes weak, and it becomes difficult to secure sufficient sealing performance. The separate plate of the control valve for an automatic transmission according to the present invention has been invented in order to eliminate any such inconvenience.

[0007]

A separate plate of a control valve for an automatic transmission according to the present invention is used in a state of being sandwiched between a plurality of control valve bodies constituting a control valve for an automatic transmission. The whole is flat and a part is formed with a through hole for circulating hydraulic oil. A seal layer made of an elastic material is formed by screen printing on a part of the surface of the metal plate which constitutes the separate plate of the present invention, which is located at least around the through hole and contacts the end face of the control valve body. Are formed. Then, the seal layer protrudes from a contact portion between one surface of the separate plate and the end surface of the control valve body (portions that contact each other when the seal layer is assumed not to exist. The same in the entire specification). It is formed only on the non-existing part. or,
Preferably, an exposed portion having a width dimension of 0.5 mm or more that is not covered with a sealing material exists between the widthwise edge of the seal layer and the peripheral edge of the through hole. Alternatively, the ratio of the area of the portion covered by the sealing layer to the contact portion between one surface of the separate plate and the end surface of the control valve body is 80% or less. More preferably, as the elastic material forming the seal layer, a foamed elastic material whose volume is increased by a large number of small bubbles existing inside is used.

[0008]

According to the separate plate of the control valve for an automatic transmission of the present invention configured as described above, independent packing is not required and the number of parts is reduced,
The cost of the control valve and the planetary gear type automatic transmission incorporating the control valve can be reduced by simplifying the parts processing, parts management, and assembly work. In addition, since the sealing material is provided only on the surface of the part of the separate plate that requires sealing, the amount of the sealing material used can be reduced and the cost can be reduced. Further, if the exposed portion is provided between the end of the seal layer in the width direction and the peripheral edge of the through hole, it is possible to more reliably prevent the seal material forming the seal layer from being exposed to the flow of ATF. , It is possible to further reduce the possibility that fragments of the sealing material are mixed in the ATF. Therefore, the small pieces of the sealing material do not cause malfunction of the control valve and the transmission main body. Further, the ratio of the area of the sealing material sandwiched between the end surface of the control valve body and each of the separate plates is set to 80% or less with respect to the contact portion between one surface of the separate plate and the end surface of the control valve body. If the width is made narrower, the force per unit area of pressing the sealing material becomes stronger accordingly, and sufficient sealing performance can be secured. Furthermore, if a foam-type elastic material whose volume is increased by a large number of small bubbles existing inside is used as the elastic material forming the seal layer,
The conformability between the seal layer and the end surface of the control valve body can be further improved. Then, the surface pressure distribution between the seal layer and the end face of the control valve body is made more uniform, and good sealing properties can be obtained from the initial stage.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Separate plates 4a and 4b of a control valve for an automatic transmission according to the present invention include three control valve bodies 3a, 3b and 3c which are vertically stacked, as shown in FIG. Sandwiched between. As shown in FIG. 3, seal layers 6, 6 are formed on the upper and lower surfaces of each of the separate plates 4a, 4b made of a flat plate such as an aluminum alloy plate, or the upper surface of each of the control valve bodies 3a, 3b, 3c. Is formed in a mesh shape in accordance with the shapes of the end faces of the partition wall exposed on the lower surface, the end faces of the outer peripheral walls of the control valve bodies 3a, 3b, 3c, and the end faces of the outer peripheral walls of the separate plates 4a, 4b. ing. Further, as shown in FIG. 3, the sealing layers 6, 6 are also formed around the through holes 5, 5 formed in the separate plates 4a, 4b.

These seal layers 6 and 6 are formed by attaching oil resistant rubber, which is an elastic material, to both surfaces of the separate plates 4a and 4b by screen printing.
A space between the widthwise edges of the seal layers 6 and 6 and the edges of the through holes 5 and 5 and the edges of the partition wall and the outer peripheral wall are covered with a sealing material. Not 0.
The exposed portions 7, 7 having a width dimension of 5 mm or more are provided.

Separate plates 4a and 4b of the control valve for an automatic transmission according to the present invention having the above-described structure.
According to the above, the respective sealing layers 6, 6 seal between the lower surface or the upper surface of the respective control valve bodies 3a, 3b, 3c to prevent ATF from leaking. Therefore, independent packing is not required, and the number of parts is reduced, so that parts machining, parts management, and assembly work can be simplified, and the cost of the control valve and the planetary gear type automatic transmission incorporating the control valve can be reduced. Further, since the sealing material is provided only on the surface of the part of each of the separate plates 4a and 4b that requires sealing, the amount of the sealing material used can be reduced and the cost can be reduced.

Further, between the widthwise end edges of the seal layers 6, 6 and the peripheral edges of the through holes 5, 5 and the edges of the partition wall and the outer peripheral wall, exposed portions 7, 7 which are not covered with the seal material. By providing the sealing layer 6, the sealing material forming the sealing layers 6 is not exposed to the flow of ATF. Therefore, AT
There is no possibility that fragments of the sealing material will be mixed in F,
Control valve 2 and transmission body 1 are small pieces of sealing material.
The malfunction of (Fig. 1) will not occur.

Further, the ratio of the area of the sealing material sandwiched between the lower surface or the upper surface of each of the control valve bodies 3a, 3b, 3c and each of the separate plates 4a, 4b is defined by the one surface of the separate plates 4a, 4b. And 80% or less with respect to the contact portion with the end faces of the control valve bodies 3a, 3b, 3c. For this reason, the force per unit area of pressing the sealing material becomes stronger accordingly, and sufficient sealing performance can be secured.

In particular, if a foamed elastic material whose volume is increased by a large number of small bubbles existing inside is used as the elastic material forming each of the sealing layers 6, 6, the sealing layers 6, 6 and the above control valve bodies 3
The compatibility with the end faces of a, 3b, and 3c can be further improved. Then, the surface pressure distribution between the seal layers 6 and 6 and the end faces of the control valve bodies 3a, 3b and 3c can be made more uniform, and good sealing performance can be obtained from the initial stage.

[0015]

Since the separate plate of the control valve for an automatic transmission according to the present invention is constructed and operates as described above, the automatic transmission having a high degree of sealing property and less likely to cause malfunction is inexpensive. Can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic side view of an automatic transmission provided with a control valve.

FIG. 2 is a schematic exploded perspective view of a control valve.

FIG. 3 is an enlarged cross-sectional view of a seal layer forming portion of the separate plate.

[Explanation of symbols]

 1 Transmission main body 2 Control valve 3a, 3b, 3c Control valve body 4a, 4b Separate plate 5 Through hole 6 Seal layer 7 Exposed part

Claims (4)

[Claims] 1. A through-hole for allowing hydraulic oil to flow in a part, which is used in a state of being sandwiched between a plurality of control valve bodies constituting an automatic transmission control valve. The separate plate, which is located at least around the through hole on the partial surface of the metal plate forming the separate plate and is in contact with the end surface of the control valve body, is made of an elastic material by screen printing. A seal plate is formed, and the seal layer is formed only on a portion that does not protrude from the contact portion between one surface of the separate plate and the end surface of the control valve body. 2. The exposed portion having a width dimension of 0.5 mm or more, which is not covered with a sealing material, is present between the widthwise edge of the sealing layer and the peripheral edge of the through hole. Separate plate for control valve for automatic transmission. 3. The method according to claim 1 or 2, wherein the ratio of the area covered by the seal layer to the contact portion between one surface of the separate plate and the end surface of the control valve body is 80% or less. Separate plate for control valve for automatic transmission. 4. The automatic transmission according to claim 1, wherein the elastic material forming the seal layer is a foam-type elastic material whose volume is increased by a large number of small bubbles existing inside. Separate plate for machine control valve.