JPH0573244U - Actuator - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an actuator capable of smoothly moving an output member by preventing water from entering an air chamber. An actuator 1 in which a mounting position of a vehicle body side bracket 11 is set in the same direction as the protruding direction of the breather 9 and close to the vehicle body mounting bosses 2a1 and 2a2 arranged near the breather 9.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an actuator used as a drive source for an automatic constant-speed traveling device that automatically controls the traveling speed of an automobile to a set value, and more particularly to a negative pressure type actuator.

[0002]

[Prior Art]

 The actuators shown in FIGS. 3 and 4 are known as actuators used as a drive source for an automatic constant speed traveling device.

The illustrated actuator 50 has a diaphragm 53 and an output member 54 housed inside a first case 51 and a second case 52, and is surrounded by the output member 54, the diaphragm 53, and the second case 52. A return spring 56 is incorporated in the negative pressure chamber 55 that is opened.

On the outside of the first case 51, a tip end side of a plate-shaped vehicle body mounting bracket 60 is attached by tightening a bolt 61, and a base separated from the tip end side of the vehicle body mounting bracket 60. The end side is fixed to a vehicle body panel 65 in the engine room.

A breather 51a is provided in a part of the first case 51, which is laterally communicated from the inner side to the outer side of the first case 51 in a vehicle-mounted state shown in FIG. As shown in FIG. 4, 51a communicates with an air chamber 57 formed between the inside of the first case 51 and the diaphragm 53 at a position separated from the vehicle body mounting bracket 60.

Here, when the negative pressure level of the negative pressure chamber 55 is raised by the pressure control means (not shown), the output member 54 is moved toward the upper side in FIG. 4 against the elastic repulsive force of the return spring 56. To do so, the opening of the throttle valve is adjusted via the throttle cable 62 connected to the output member 54.

Further, when the negative pressure level of the negative pressure chamber 55 is lowered, the elastic restoring force of the return spring 56 causes the output member 54 to move back toward the lower side in FIG. Do not adjust the valve opening.

The breather 51a has a function of taking in air into the air chamber 57 so that the air chamber 57 does not cause a pressure fluctuation when the output member 54 is moved and the output member 54 is smoothly moved. ..

[0009]

[Conventional problems]

 However, in the above-described conventional actuator 50, the breather 51a is provided at a position separated from the vehicle body mounting bracket 60 so as to communicate with the first case 51 in the direction from the inside to the outside in the vehicle body mounted state. Therefore, the opening portion of the breather 51a is in an uncovered state, and when there is water in the engine room, water or the like may enter the air chamber 57 from the outside of the first case 51 through the breather 51a. It cannot be said that if the water enters the air chamber 57, the output member 54 is prevented from moving due to freezing or the like when the output member 54 moves, so that the output member 54 moves smoothly. It had the drawback that it would run out and malfunction.

[0010]

[Problems to be solved by the device]

 The problem to be solved is that water may enter the air chamber if the opening of the breather is open.

[0011]

[Means for Solving the Problems]

 In order to make it difficult for water to enter the air chamber, the invention is such that an output member that moves according to a negative pressure level, a case that accommodates the output member and forms an air chamber, and a case that protrudes toward the outside of the case. A plurality of vehicle body mounting bosses fixed to the vehicle body side bracket, and at least two vehicle body mounting bosses protruding in the same direction as the vehicle body mounting boss and communicating with the air chamber on one side and the other body mounting boss on the other side. Between the vehicle body mounting boss and a breather open to the atmosphere near the vehicle body mounting boss, and the vehicle body mounting boss disposed near the breather is brought close to the vehicle body mounting boss in the same direction as the protruding direction of the breather. It is characterized in that the mounting position of the bracket is set, and in a more preferred embodiment, it is oriented in the same direction as the vehicle body mounting boss. The breather that protrudes upward has a flow path that communicates with the air chamber, and the end of the breather is attached to the bracket on the vehicle body side so that the breather does not allow water to enter the air chamber. By doing so, the purpose of providing an actuator capable of smoothly moving the output member was realized.

[0012]

[Function of the device]

 In the actuator according to the present invention, the breather is connected to the air chamber on one side, and is open to the atmosphere between at least two vehicle body mounting brackets on the other side in the vicinity of the vehicle body mounting bracket. Since the position is set in the same direction as the protruding direction of the breather and close to it, the same direction as the protruding direction of the breather is closed by the vehicle body side bracket near the open side of the breather to the atmosphere. Even if there is water, it becomes difficult for water to splash on the breather, and there is almost no infiltration into the air chamber.

[0013]

【Example】

 1 and 2 show an embodiment of an actuator according to the present invention.

The actuator 1 shown in the figure has a state in which the outer peripheral side of a disk-shaped diaphragm 4 made of rubber is sandwiched between a first case 2 and a second case 3 assembled to the first case 2. It is fixed at.

A disk-shaped output member 5 is fitted in the center of the diaphragm 4, and an air chamber A is formed between one side of the output member 5 and the first case 2. A negative pressure chamber V incorporating a return spring 6 is formed between the other side of the output member 5, the diaphragm 4 and the second case 3. A throttle cable (see FIG. 4) is connected to one side of the output member 5, and the output member 5 is urged by the return spring 6 toward the lower side in FIG.

The outer wall 2a of the first case 2 is provided with two vehicle body mounting bosses 2a1, 2a2 which are axially projecting toward the vehicle body panel 65 in the vehicle body mounting state shown in FIG. Screw members 7 each having a female screw 7a formed on the inner periphery thereof are respectively inserted in the centers of the vehicle body mounting bosses 2a1 and 2a2.

Further, two vehicle body mounting bosses 3a1 and 3a2, which are similar to the vehicle body mounting bosses 2a1 and 2a2, project axially toward the vehicle body panel 65 side on the outer wall 3a of the second case 3 as well. A screw member (not shown) having a female screw formed on the inner circumference is inserted in the center of the vehicle body mounting bosses 3a1, 3a2. The protruding tip sides of the vehicle body mounting bosses 2a1, 2a2, 3a1, 3a2 form the same plane.

A breather 9 is provided integrally with the first case 2 between the vehicle body mounting bosses 2 a 1 and 2 a 2 of the first case 2.

The breather 9 slightly protrudes in a cylindrical shape from the outer wall 2a of the first case 2 in the same direction as the protruding direction of the vehicle body mounting bosses 2a1, 2a2, 3a1, 3a2, and is formed in the center. The air flow passage 9a is communicated with the air chamber A of the first case 2 on the one hand, and is open to the atmosphere on the other hand.

A second air passage 9c is formed by cutting the outer wall 9b of the breather 9 toward the outer wall 2a of the second case 2 in a semicircular shape on the protruding tip side of the breather 9. This flow path 9b also communicates with the air chamber A of the first case 2 via the first air flow path 9a on the one hand, and is open to the atmosphere on the other hand.

The size in which the breather 9 projects from the outer wall 2a of the first case 2 is larger than the projecting tips of the vehicle body mounting bosses 2a1, 2a2, 3a1, 3a2.

On the other hand, vehicle body side brackets 11 are attached to the tip ends of the vehicle body attachment bosses 2a1, 2a2, 3a1, 3a2 via cushion rubbers 10, respectively.

As is apparent from FIG. 1, the vehicle-body-side bracket 11 is provided with a flat actuator mounting portion 11a bent in a crank shape and slightly separated from the vehicle body panel 65. The cushion rubbers 10 are respectively assembled at positions corresponding to the vehicle body mounting bosses 2a1, 2a2, 3a1, 3a2.

At the center of the cushion rubber 10, a cylindrical bush 12 is concentrically inserted into the screw member 7 on the vehicle body mounting boss 2a1, 2a2 side and the screw member (7) on the vehicle body mounting boss 3a1, 3a2 side, respectively. The bracket assembly parts 10a, which are formed as notches on the outer peripheral side substantially central circumference of the hole 11a1 provided in the actuator mounting part 11a, are fitted into the vehicle body side bracket. Assembled to 11.

When the actuator 1 having the above-described structure is fixed to the vehicle body panel 65, the tip ends of the vehicle body mounting bosses 2a1, 2a2, 3a1, 3a2 are brought into contact with the cushion rubber 10 of the vehicle body side bracket 11, respectively. The vehicle body side bracket 11 is brought into contact with the vehicle body side bracket 11 through the bush 12 of the cushion rubber 10 and the bolts 13 are respectively screwed into the female threads 7a of the vehicle body mounting bosses 2a1, 2a2, 3a1, 3a2. When 11 is assembled to the vehicle body mounting bosses 2a1, 2a2, 3 a1, 3a2, the breather 9 arranged between the vehicle body mounting bosses 2a1, 2a2 of the first case 2 is attached to the vehicle body mounting bosses 2a1, 2a2. Since it projects further than the projecting tip, the actuator mounting part of the vehicle body side bracket 11 The tip portion is located near 11a.

The vehicle body side bracket 11 with the actuator 1 assembled is fitted to the screw 65 a provided on the vehicle body panel 65, and then the nut 65 c is screwed into the screw 65 a to fix the vehicle body side bracket 11 to the vehicle body panel 65. As a result, the actuator 1 is fixed to the vehicle body panel 65 in the horizontal state as shown in FIG.

Here, by fixing the actuator 1 to the vehicle body panel 65, the front end side of the breather 9 is arranged in the vicinity of the actuator attaching portion 11a between the vehicle body attaching bosses 2a1 and 2a2 of the first case 2. Thus, the mounting position of the vehicle body side bracket 11 is set. Since the actuator mounting portion 11a of the vehicle body bracket 11 is located near the same side as the opening direction of the breather 9, the air chamber A has the first air passage 9a and the second air passage 9c of the breather 9. To connect to the outside in a bent state at a right angle.

Therefore, when the negative pressure level of the negative pressure chamber V is raised by the pressure control means (not shown), the output member 5 is output to the right side in FIG. 2 against the elastic repulsive force of the return spring 6. In order to move it, the throttle cable connected to the output member 5 is pulled to adjust the opening of the throttle valve.

Further, when the negative pressure level of the negative pressure chamber V is lowered, the elastic restoring force of the return spring 6 causes the output member 5 to move back toward the left side in FIG. 2, so that the output member 5 is connected to the output member 5. The throttle cable is returned and the throttle valve opening is not adjusted.

During this time, when the output member 5 moves or returns, the breather 9 opens the air chamber A to the atmosphere so as not to cause pressure fluctuations in the air chamber A, and in the unlikely event that the actuator 1 is exposed to water. Even if there is, the actuator mounting portion 11a of the vehicle body bracket 11 is located near the same side as the opening direction of the breather 9, so that the breather 9 is unlikely to be splashed with water.

In the embodiment of the actuator according to the present invention, the actuator mounting portion 11a of the vehicle body bracket 11 is located near the same side as the opening direction of the breather 9, but the tip side of the breather 9 is The air chamber A may be brought into contact with the actuator mounting portion 11a of the vehicle body bracket 11, and even in that case, the air chamber A is exposed to the outside by the first air passage 9a and the second air passage 9c of the breather 9. It goes without saying that the invention can be implemented in the same way as the communication is made in a substantially straight bent state.

[0032]

[Effect of the device]

 As described above, since the actuator according to the present invention has the above-mentioned structure, the breather communicates with the air chamber on the one hand and the body mounting brackets on at least two locations near the body mounting bracket on the other hand. The breather is exposed to the atmosphere and the mounting position of the body side bracket is set in the same direction and close to the breather protruding direction.Therefore, in the vicinity of the breather open side to the atmosphere, the breather protruding direction is the same. Since the direction is blocked by the bracket on the vehicle body side, even if there is water, it is difficult for water to splash on the breather and it does not enter the air chamber, preventing the output member from returning. It is possible to prevent it, and thereby, the excellent effect of smoothly moving the output member is exhibited.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of an actuator according to the present invention.

FIG. 2 is a partially cutaway side view of the actuator shown in FIG.

FIG. 3 is a partially cutaway front view of a conventional actuator.

4 is a partially cutaway plan view of the actuator shown in FIG.

[Explanation of symbols]

 1 Actuator 2, 3 Case 2a1, 2a2, 3a1, 3a2 Vehicle body mounting boss 5 Output member 9 Breather 11 Vehicle body side bracket A Air chamber

Claims (2)

[Scope of utility model registration request] 1. An output member that moves according to a negative pressure level, a case that accommodates the output member and forms an air chamber, and a plurality of vehicle bodies that protrude toward the outside of the case and are fixed to a bracket on the vehicle body side. A mounting boss, which projects in the same direction as the vehicle body mounting boss and communicates with the air chamber on the one hand, and on the other hand in the vicinity of the vehicle body mounting boss between at least two locations of the vehicle body mounting boss; A breather open to the atmosphere is provided, and a mounting position of the vehicle body side bracket is set by approaching a vehicle body mounting boss disposed in the vicinity of the breather in the same direction as the protruding direction of the breather. Actuator. 2. A breather projecting in the same direction as the vehicle body mounting boss is provided with a flow path communicating with the air chamber, and an end of the breather is abutted against a vehicle body side bracket for mounting. The actuator according to claim 1.