JP3163383B2 - Actuator for automatic vehicle speed controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator for an automatic vehicle speed control device used to control the vehicle speed by pulling and returning a throttle wire by drawing and introducing air in a negative pressure chamber. .

[0002]

2. Description of the Related Art Conventionally, as an actuator used in the above-described automatic vehicle speed control device, for example, an actuator case having a substantially bowl-shaped diaphragm and a substantially bowl-shaped actuator case forming a negative pressure chamber, and a center of the diaphragm That moves with the diaphragm to draw out and introduce air from the negative pressure chamber to contact the actuator case.
There is a configuration with a diaphragm plate that separates, and the suction and exhaust operation of a negative pressure pump connected to the actuator case via a hose causes the air in the negative pressure chamber to be drawn out and introduced through the hose, and the throttle By moving the diaphragm plate connected to the wire together with the diaphragm, the throttle wire is pulled and returned.

[0003]

However, in the above-described conventional actuator for a vehicle speed automatic control device, when the majority of the air in the negative pressure chamber is led out and the throttle wire is fully moved to the pulling side, the diaphragm plate is not moved. When the actuator comes into close contact with the actuator case and air is again introduced into the negative pressure chamber, a delay occurs in the return operation of the diaphragm plate. It has a problem in that there is a possibility that aroused the anxiety, to solve this problem has been a problem of the traditional.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has an automatic vehicle speed control apparatus which smoothly and quickly performs a returning operation of a throttle wire so as not to give a driver an uneasy feeling at all. The purpose of the present invention is to provide an actuator for a vehicle.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a method for connecting _a load to _a load.
The diaphragm plate is made,
Diaphragm for movably storing diaphragm plate
And Mukaba, the Da Iyafura Mukaba forms a Ryakuwan type shape
And A click <br/> Ju eta case bottom portion is formed with but assembled integrally, the diaphragm cover and activator
Between the da Iyafu <br/> ram plates holding the and actuator case with fitted between the Yuetakesu
A diaphragm forming a negative pressure chamber by
And the small-diameter end abuts against the diaphragm plate.
The large-diameter end is pressed against the bottom of the actuator case.
In the vehicle speed automatic control actuator having a coil spring in contact, the bottom of the pre-Symbol actuator cases
The surface protrudes toward the diaphragm plate
Stepped portion is formed radially, the Da ear Fulham plates
Is directed toward the bottom of the actuator case.
A small diameter end of the coil spring
In addition, the end surface can contact the step of the actuator case
And characterized in that the configuration inside the protrusion having a substantially cylindrical shape is formed, and a means for solving the conventional problems described above the structure of such a vehicle speed automatic control actuator.

[0006]

SUMMARY OF THE INVENTION In the vehicle speed automatic control actuator according to the invention, when moving most of the air by deriving the diaphragm plate on the actuator case side in the negative pressure chamber, stage provided on the bottom surface of the actuator cases
The difference portion, the end face of the inner projection provided on da unpleasant Fulham plates
DOO abuts, so preventing with sucking to the actuator case of the dust ear Fulham plate, upon introduction of air into the negative pressure chamber again, so that the diaphragm plate is quickly return operation, i.e., the throttle wire back operation is possible and that Do not be carried out rapidly.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show an embodiment of an actuator for an automatic vehicle speed control device according to the present invention.

An actuator 1 for an automatic vehicle speed control device shown in the figure has a diaphragm 4 in an internal space formed by combining an actuator case 2 having a substantially bowl shape and a diaphragm cover 3 also having a substantially bowl shape. The diaphragm 4 also has a substantially bowl shape, and its outer peripheral edge 4a is formed in each of the openings of the actuator case 2 and the diaphragm case 3 to outward flanges 2a, 3a.
It is provided in a state of being sandwiched between a.

[0010] in the center of the diaphragm 4 diamond Hula
Arm plate 5 Yes fixed, set vignetting in diameter between the diaphragm plate 5 and the actuator case 2
The end 6a is in contact with the diaphragm plate 5 and has a large diameter end.
The part 6b is pressed against the bottom part 2f of the actuator case 2.
An elastic force of the circular cone-shaped coil spring 6 by positioning the diaphragm plate 5 on the bottom side of the diaphragm cover 3 that, so that negative pressure chamber 7 is formed between the diaphragm 4 and the actuator casing 2. At the center of the diaphragm plate 5, there is provided an outer protrusion 5a (shown only in FIG. 1) that can protrude and retract from a through hole 3b formed on the bottom surface of the diaphragm cover 3.
A throttle wire 8 connected to a throttle valve (not shown) is connected to the outer projection 5a via a retaining block 8a. In addition, this diaphragm plate 5
Of the actuator case 2 toward the bottom 2f.
Only small diameter end of the conical coil spring 6 out predetermined amounts collision
Eggplant in side projection 5b a substantially cylindrical Ru HamaSosu the parts 6a (shown only in FIG. 1) is provided with an end face 5d of the inner protrusions 5b
The is provided with a notch on 5 c.

[0011] In addition, the actuator case 2 bottom surface part 2
f, as shown in FIG.
If the step 2e projecting toward
In both cases, the through hole 2b for communicating the negative pressure chamber 7 with the outside is formed on the bottom
Ri forms Nashitea a position shifted from the center parts 2f, actuator side fitting tube 2c which projects outside the through hole 2b of this
Are provided continuously . In other words, the step portion 2e is negative pressure chamber
7 with the air inside
A notch 5c is provided in the end face 5d of the inner projection 5b of the rate 5
The bottom of the actuator case 2
To prevent the end face 5d of the inner protrusion 5b from closely adhering to the portion 2f.
When air is introduced into the negative pressure chamber 7 again ,
Inward protrusion 5b from bottom surface 2f of actuator case 2
Can be quickly separated. this
When air is introduced into the negative pressure chamber 7, the actuator cable
Formed at a position deviated from the center of the bottom surface 2f of the base 2.
In that the through-holes 2b, introducing air around the inner-side projections 5b, by allowing a force to the left in FIG. 1 direction is applied to the whole of the diaphragm plate 5 and more quickly in case 2 the bottom face of the inner protrusions 5b so that can be separated 2f or et al.

In this embodiment, the actuator 1 for the automatic vehicle speed control is a valve for sucking air from the negative pressure chamber 7 through the through-hole 2b during operation and releasing the negative pressure chamber 7 to the atmosphere through the through-hole 2b when stopped. A built-in negative pressure pump 10 is integrally provided. This negative pressure pump 1
Numeral 0 includes a solenoid valve 40B functioning as a vent valve having a coil 42 and a valve element 45 in a pump case 11 having a substantially box shape, and a solenoid valve 40A functioning as a safety valve having the coil 42 and the valve element 45. A motor 30 and a pump unit 20 are provided on the side and bottom surfaces of the pump case 11, respectively, and an intake / exhaust hole 12a communicating with the pump unit 20 and the solenoid valves 40A and 40B is formed in the pump case 11. The pump case 11 of the negative pressure pump 10
Is provided with a pump-side fitting cylinder 12b which protrudes to the outside continuously with the intake / exhaust hole 12a.

The negative pressure pump 10 is mounted on the actuator case 2 via a bracket 50 for mounting the vehicle. The bracket 50 includes a base plate 51 fixed to the vehicle body, and a fixed plate 52 bent and formed so as to extend in a direction substantially perpendicular to the base plate 51 from between both ends of the base plate 51.
The actuator 1 is located on one surface (the left surface in the drawing) of the fixed plate 52, and the negative pressure pump 10 is located on the other surface (the right surface in the drawing) of the fixing plate 52.
By screwing a screw 55 through the screw insertion hole provided in the fixing plate 52 into a screw hole 57 on the actuator case 2 side and a screw hole (not shown) on the pump case 11 side, respectively, Each is fixed in a balanced state. The actuator 1 and the negative pressure pump 10 are
In the state where the pump side fitting tube 12b is fixed to the pump side fitting tube 12b, the pump side fitting tube 12b of the pump case 11 projects through the tube insertion hole 56 formed in the fixed plate 52 toward the actuator 1 side. To the actuator side fitting cylinder 2 of the actuator case 2 via an O-ring 66
The negative pressure pump 10 is integrated with the actuator 1 by fitting c.

Reference numeral 9 in the figure denotes a ventilation duct.
The space between the diaphragm cover 3 and the diaphragm 4 is opened to the atmosphere so that the movement of the diaphragm 4 is performed smoothly. Reference numeral 71 denotes a boot, reference numeral 72 denotes a wire support, reference numeral 73 denotes a casing cap, reference numerals 74 and 75 denote throttle wire adjusting screw portions and adjusting nuts, and reference numeral 76 denotes a wire outer tube.

In the actuator 1 for a vehicle speed automatic control device having such a configuration, the motor 30 of the negative pressure pump 10 is operated by a command from a controller (not shown) to start the suction operation of the pump unit 20 and to open both the pumps. When the valves 40A and 40B are switched to the closed state, the air in the negative pressure chamber 7 is sucked through the through hole 2b of the actuator case 2 and the suction / exhaust hole 12a of the negative pressure pump 10, and the inside of the negative pressure chamber 7 is in a negative pressure state. Becomes

When the diaphragm 4 and the diaphragm plate 5 move toward the actuator case 2 against the elastic force of the conical coil spring 6 by an amount corresponding to the negative pressure at that time, the throttle wire 8 is pulled. As a result, the throttle valve is opened by the commanded amount.

When the motor 30 of the negative pressure pump 10 is stopped by a command from the controller and the operation of the pump unit 20 is stopped, and the valves 40A and 40B are again switched to the atmosphere open state, the suction and discharge of the negative pressure pump 10 is performed. Pore 12
a and air is introduced into the negative pressure chamber 7 through the through hole 2 b of the actuator case 2.

[0018] As shown this time, in FIG. 1 by a dashed line,
Step 2 provided on bottom surface 2f of actuator case 2
e and the inner protrusion 5 b provided on the diaphragm plate 5.
Terms of the end face 5d is in contact, with the the inner side projection 5b is provided with a notch 5c, since the provided staggered through hole 2b from the center of the bottom surface 2f of the actuator case 2, the inner protrusions 5b not the end surface 5d Contact and bottom surface 5f of the actuator case 2 becomes close contact, therefore, the diaphragm plate 5 rapidly away from the actuator case 2.

When the diaphragm plate 5 separated from the diaphragm 4 and the actuator case 2 returns to the diaphragm cover 3 by the elastic force of the conical coil spring 6, the throttle wire 8 is returned to the left in the drawing. , The throttle valve is closed by the commanded amount.

[0020]

The detailed configuration of the actuator for an automatic vehicle speed control device according to the present invention is not limited to the configuration of the above-described embodiment.

[0022]

As described above, in the actuator for the automatic vehicle speed control device according to the present invention, since the above-described configuration is employed, most of the air in the negative pressure chamber is led out to bring the diaphragm plate into contact with the actuator case. Even in this state, since the diaphragm plate does not adhere to the actuator case, when air is introduced again into the negative pressure chamber, the diaphragm plate is quickly separated from the actuator case, that is, the return operation of the throttle wire is performed smoothly and smoothly. It is possible to perform the operation promptly, which brings about a very excellent effect that the driver can be given more confidence.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing one embodiment of an actuator for a vehicle speed automatic control device according to the present invention.

FIG. 2 is an overall perspective view of the actuator of FIG.

FIG. 3 is a plan view of the actuator of FIG. 1;

4 is a partial enlarged perspective view showing the bottom surface portion of the A effectuator eta case in the A Kuchue data FIG.

[Explanation of symbols]

 1 Actuator 2 Actuator case2e step 2f bottom 3 Diaphragm cover  4 Diaphragm 5 Diaphragm playG 5b Inner protrusion 5d end face 6 Coil spring 6a Small diameter end 6b Large diameter end  7 Negative pressure chamber

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F02D 9/00-11/10 F15B 15/00-15/28

Claims (1)

(57) [Claims] 1. A diaphragm plate connected to a load.
And the diaphragm plate can be moved in a roughly bowl shape
A diaphragm cover for housing the said at an Ryakuwan type shape Daiyafura Mukaba is integrally assembled
Between the diaphragm cover and the actuator case , the actuator case being attached and having a bottom surface formed.
The da holding the ear Fulham plates with fitted in
And a negative pressure chamber is formed with the actuator case.
An diaphragm and a small-diameter end portion housed in the negative pressure chamber,
The large diameter end is in contact with the plate
In the vehicle speed automatic control actuator having a coil spring for pressing the bottom surface of over scan, the bottom portion of the front Symbol actuator cases, the Daiyafu
Steps projecting toward the ram plate are formed radially.
Is, the da ear Fulham to the plates, the actuator Quai
Projecting a predetermined amount toward the bottom of the coil spring
The small-diameter end of the housing is fitted and the end face is
A substantially cylindrical inner projection that can contact the step of the base
Vehicle speed automatic control actuator, characterized in that you are made.