JPH0434243Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mounting structure for an actuator used for changing a transmission of an automobile, and particularly to a mounting structure for an actuator housing and a bearing.

(Prior Art) Conventionally, there is a mounting structure for this type of actuator as shown in FIG. 3, for example. In such a conventional example, the hollow interior of the housing 1 is divided into a first chamber 3 and a second chamber 4 by a diaphragm 2 provided in the housing 1, and the first chamber 3 is connected to a passage 3a. The second chamber 4 is in communication with the intake manifold (not shown) of the engine or the atmosphere through a passage 4a, and the other second chamber 4 is also in communication with the intake manifold or the atmosphere through a passage 4a. 5 is a rod slidably and operatively connected to the diaphragm 2;
A fixed end of the diaphragm 2 extends into the first chamber 3 of the housing 1 and is connected to the approximate center of the diaphragm 2 .
Reference numeral 6 denotes a bearing having a substantially cylindrical cross section that is disposed on the outer periphery of the rod 5, and is provided with an annular outward flange 6a at the end near the housing.
A housing 1 constituting the first chamber 3 side is placed on the outer periphery of a.
By integrally welding the opening periphery of the
It connects the housing 1 and the bearing 6.
7 is an oil seal filled in the side notch of the outward flange 6a facing the first chamber 3 side;
It comes into contact with the surface and performs a sealing action between the rod 5 and the bearing 6.

(Problems to be solved by the invention) However, according to the configuration of such a conventional example,
When welding the housing 1 and the bearing 6, thermal distortion occurs in the bearing 6 due to the heat during welding, and the bearing 6
Thermal distortion also affects the oil seal 7 inscribed in the oil seal 7, causing problems such as deterioration of the sealing properties of the oil seal. For this reason, oil from the free end of the rod flows into the first chamber 3 of the housing and comes into contact with the diaphragm 2, causing deterioration of the diaphragm 2, or the oil from the intake manifold side communicating with the first chamber 3. There were problems such as oil flowing into the engine and causing the engine to malfunction. Furthermore, if the influence of thermal distortion during welding extends to the entire inner circumference of the bearing 6, the sliding resistance of the rod 5 will increase, causing other problems such as the rod 5 not operating smoothly. It was causing a point.

Therefore, as a countermeasure to this problem, measures have been proposed such as correcting the inner periphery of the bearing 6 after the welding work is completed to improve dimensional accuracy, but according to this method, the correction work takes time. New problems arose as costs increased.

Furthermore, in the conventional mounting structure as described above, the oil seal 7 that seals between the rod 5 and the bearing 6 faces the first chamber 3 side of the housing that communicates with the intake manifold side. When there is a negative pressure inside 3, the oil seal 7
The seal lip portion of the oil seal is drawn toward the first chamber 3 side by the negative pressure suction action, and as in the case where it is affected by thermal distortion, there is also the drawback that the sealing properties of the oil seal deteriorate.

Therefore, the present invention was devised to solve the above-mentioned problems of the conventional technology.The purpose of this invention is to eliminate the occurrence of thermal distortion, and to prevent the seal lip from forming even when negative pressure is applied to the oil seal. An object of the present invention is to provide an actuator mounting structure that can reliably maintain a contact surface pressure of .

(Means for solving the problem) In order to achieve the above object, in the actuator mounting structure according to the present invention, the inside of the housing is divided into a first chamber and a second chamber by a diaphragm, and the inside of the housing is divided into a first chamber and a second chamber. The first chamber side is opened, one end of the rod inserted into the first chamber through the opening is connected to the diaphragm, a bearing that slidably holds the outer circumference of the rod is fixed to the opening of the housing, and the rod and the rod are connected to each other. In the actuator, an oil seal facing the first chamber side is interposed between the bearing and the oil seal, and an outward flange is provided protruding from the first chamber side end of the bearing, and the opening peripheral edge of the housing is connected to the outward flange. The bearing and the housing are connected and fixed by mechanical bending and locking, and an oil seal stopper is integrally provided on the housing.

(Function) In the present invention having the above configuration, as a structure for connecting the housing and the bearing, an outward flange is provided on the bearing, and the opening periphery of the housing is mechanically bent and locked to the outward flange. The occurrence of distortion due to heat is completely eliminated, thereby preventing oil leakage and an increase in the sliding resistance of the rod due to a decrease in the sealing function of the oil seal. Furthermore, even if the first chamber becomes negative pressure, the oil seal stopper provided on the housing can reliably prevent the seal lip of the oil seal from being sucked into the first chamber. can maintain a sealed contact and reliably prevent oil from leaking.

(Example) The present invention will be explained below based on the illustrated example. In the embodiment shown in FIGS. 1 and 2, a diaphragm 2 provided in the housing 1 allows the hollow interior of the housing 1 to be divided into a first chamber 3 and a second chamber 4.
The first room 3 is divided into passages 3a and 3a.
The other second chamber 4 communicates with the intake manifold (not shown) of the engine or the atmosphere through a passage 4a. 5
is a rod operatively connected to the diaphragm 2; the fixed end of the rod 5 is inserted into the first chamber 3 of the housing 1 and connected to the approximate center of the diaphragm 2;

Reference numeral 6 denotes a bearing having a substantially cylindrical cross section that is arranged around the outer periphery of the rod 5 and slidably holds the rod 5, and has an annular outward flange 6a at the end near the housing.
The opening of the housing 1 constituting the first chamber 3 side is fitted onto the outer periphery of the outward flange 6a, and the opening periphery of the housing 1 is caulked to the outer periphery of the outward flange 6a. The housing 1 and the bearing 6 are connected by (non-thermal connection). A gasket 9 is provided at the joint between the outward flange 6a and the caulking portion of the housing 1, and has the function of keeping the contact surface between the housing 1 and the outward flange 6a airtight.

Reference numeral 7 denotes an oil seal filled in a notch on the side of the outward flange 6a facing the first chamber 3 side, which comes into contact with the surface of the rod 5 and performs a sealing action between the rod 5 and the bearing 6. Reference numeral 8 denotes an oil seal stopper that is integrally provided at an appropriate location constituting the first chamber 3 side of the housing 1, and contacts the seal lip portion of the oil seal 7 to isolate it from the first chamber side. This has the function of reliably maintaining the contact surface pressure of the seal lip portion of the oil seal 7.

Reference numeral 10 denotes a stopper fitted into a through hole drilled at an appropriate location in the bearing 6, and has the function of engaging with a recessed portion of the rod 5 to limit the width of sliding of the rod 5. Reference numeral 11 denotes a bearing support that comes into contact with the outer periphery of the bearing 6, and the bearing support 11 and the nut 12 screwed onto the bearing 6 are connected to the fixing member 13.
The actuator unit is held fixed by engaging with the actuator unit.

(Effects of the invention) The present invention has the above-mentioned structure and operation, and as a structure for connecting the housing and the bearing, an outward flange is provided on the bearing, and the outer flange is mechanically attached to the opening periphery of the housing. Since it is bent and locked, it is possible to prevent the sealing function of the oil seal from deteriorating and the sliding resistance of the rod from increasing.Furthermore, since the oil seal stopper is integrated into the housing, the seal lip of the oil seal can be prevented from becoming negative. It is possible to reliably prevent suction toward the first chamber side due to pressure. Therefore, compared to the conventional actuator mounting structure, the reliability of the sealing function of the oil seal is dramatically increased, and the life of the oil seal can be extended as well as manufacturing costs can be reduced, among other benefits. can get.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the actuator mounting structure according to the present invention, Fig. 2 is an enlarged view of the main part of the actuator mounting structure shown in Fig. 1, and Fig. 3 is a conventional actuator mounting structure. FIG. Explanation of symbols, 1...Housing, 2...Diaphragm, 3...First chamber, 4...Second chamber, 5...Rod, 6...Bearing, 7...Oil seal, 8...
Stopper for oil seal.

Claims (1)

[Claim for Utility Model Registration] The inside of the housing is divided into a first chamber and a second chamber by a diaphragm, the first chamber side of the housing is opened, and one end of the rod inserted into the first chamber through the opening is connected to the diaphragm. In an actuator, a bearing is fixed to the opening of the housing to slidably hold the outer periphery of the rod, and an oil seal facing the first chamber is interposed between the rod and the bearing, An outward flange is protruded from the first chamber side end of the bearing, and the bearing and the housing are connected and fixed by mechanically bending and locking the opening peripheral part of the housing to the outward flange, and furthermore, the bearing and the housing are connected and fixed. An actuator mounting structure characterized by an oil seal stopper integrally provided in the housing.