JPH1044825A - Structure for vacuum pump type constant-speed drive system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for a vacuum pump type constant-speed drive system which requires only a simple vehicle-body design therefor and is easily mounted on a vehicle as an additional part. SOLUTION: A vacuum pump 351 provided on the engine-room side and a diaphragm actuator 301 arranged on a mount 312 on the interior side are connected to each other by means of a vacuum hose 316 to constitute an automatic drive system. The diaphragm actuator 301 on the interior side has therein a release valve 300 and is thus adapted to reliably release negative pressure to the outside even if the vacuum hose 316 clogs up for same reason.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a constant speed traveling device, and more particularly to a structure of a vacuum pump type constant speed traveling device.

[0002]

2. Description of the Related Art A constant-speed traveling device that automatically controls the traveling speed of an automobile to a target value set by a driver is used. This constant-speed traveling device includes a drive system that operates an accelerator pedal, a motor system that controls a throttle opening by a motor, a vacuum system that controls a throttle opening by a negative pressure due to engine rotation, and a throttle opening. There is a vacuum pump type in which a negative pressure required for control is generated by a vacuum pump. As a conventional example of these methods, for example, in Japanese Patent Publication No. 7-88815,
A structure of a motor-driven diaphragm vacuum pump is disclosed. Japanese Utility Model Laid-Open Publication No. 7-25307 discloses a structure of a diaphragm-type actuator that operates an accelerator pedal by a negative pressure from the outside.

[0003]

However, in the above-mentioned conventional examples, since the accelerator pedal is pulled by a wire cable, the route for routing the wire cable from the engine room to the vehicle compartment and the position of the body through-hole are set. Large restrictions. In addition, since there is little freedom in the mounting position of a vacuum pump or the like as a drive source for pulling the wire cable, the "retrofit (optional)" is installed at a store after shipment from the factory.
It is difficult to set this as a limit, and this is a major constraint in reducing the price. Further, if the entire actuator of such a constant-speed traveling device is disposed on the vehicle cabin side, the above problem can be solved, but in that case, the operation noise in the vehicle cabin becomes a problem.

Accordingly, an object of the present invention is to propose a structure of a vacuum pump-type constant-speed traveling device that simplifies vehicle body design and that can be easily set as a retrofit.

[0005]

In order to achieve the above object, a vacuum pump type constant speed traveling device according to the present invention is provided.
It is characterized by the following structure.

That is, a vacuum pump-type constant-speed traveling device for controlling the traveling speed of an automobile to a desired speed set by a driver, and a negative pressure generating means for generating a negative pressure according to the desired speed. Is provided in a place other than the cabin such as an engine room of the car, and an accelerator pedal driving means for driving an accelerator pedal of the car is provided on the cabin side of the car, and the negative pressure generating means and the accelerator pedal drive are provided. Means and negative pressure transmitting means, the accelerator pedal driving means is driven by the negative pressure generated by the negative pressure generating means via the negative pressure transmitting means,
Preferably, the negative pressure generating means may further include adjusting means for adjusting the negative pressure to a value relating to the desired speed. As a result, the structure of the constant-speed traveling device is separated into the engine room side and the passenger compartment side, and the structure is connected by a vacuum hose with few restrictions on the layout. Is simplified.

Further, the accelerator pedal driving means includes negative pressure releasing means for releasing the negative pressure to the atmospheric pressure. This ensures that the vacuum is released even if the vacuum hose is clogged.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a control block of a constant-speed traveling device according to an embodiment of the present invention.

In FIG. 1, when a driver depresses a setting switch 2 while traveling at a desired traveling speed, a control unit 1 controls the vehicle to be described later so that a vehicle speed signal from a vehicle speed sensor 3 becomes the desired traveling speed. Valves 253, 353, release valves 200, 300, and motors 252, 352
To work.

<First Embodiment> Next, as a first embodiment, the structure of a constant-speed traveling apparatus having the control block shown in FIG. 1 will be described below.

FIG. 2 is a view showing a structure of a constant-speed traveling device according to a first embodiment of the present invention (a main portion is shown in a cross section).

In the figure, the constant-speed traveling device connects a vacuum pump 251 mounted on an engine room side, a diaphragm actuator 201 mounted on an accelerator pedal on the vehicle compartment side, and connects the vacuum pump 251 and the diaphragm actuator 201. A vacuum hose 216 is provided.

The vacuum pump 251 includes a motor 252
The rotation of the eccentric rotary part 257 causes the connection rod 258 to reciprocate, and the pump rear part 259 having a diaphragm and a valve is a general method of generating a negative pressure. The generated negative pressure is adjusted by inhaling the outside air when the negative pressure is too large so that the control valve 253 realizes the constant speed running at the desired running speed, and the diaphragm actuator is connected to the diaphragm actuator via the vacuum hose 216. It is led to 201. The control valve 253 is a duty solenoid valve, and is duty-controlled based on a command from the control unit 1. The release valve 200 is a solenoid valve (on / off valve). The constant-speed running control is terminated by releasing the currently generated negative pressure to the atmospheric pressure based on the command of the control unit 1. The outer shape of the vacuum pump 251 is similar to that of the pump housings 254, 255,
The control valve 25
In order to be able to adjust the negative pressure of No. 3 and to generate the negative pressure by the motor 252, openings 260 and 261 are provided.

The diaphragm actuator 201 is mounted on a frame 212 having an accelerator pedal 213 which can be rotated by a support shaft 214. Accelerator pedal 2
An end of a throttle wire 215 for transmitting the rotation of the accelerator pedal 213 to a throttle valve (not shown) is attached to a tip of the throttle 13. Also, the accelerator pedal 21
In the vicinity of the distal end of No. 3, there is provided a free base 208 for fixing one end of the rod 207 to be able to swing. The outer shape of the diaphragm actuator 201 is the actuator housing 2
And a negative pressure chamber 205 including a diaphragm 202, rubber 210, and a tensioning member 206 (a detailed description of the diaphragm is omitted because of a general structure). ).
The negative pressure chamber 205 is pressed against the actuator housing 204 by the helical spring 209 when the constant speed traveling control is not performed, that is, when the atmospheric pressure is released. On the other hand, during the constant speed traveling control, the vacuum pump 25
1 operates in the direction of decreasing the volume by the negative pressure generated (left direction in the figure), so that the accelerator pedal 213 is operated via the rod 207 connected to the tension fitting 306, thereby realizing constant speed running. I do.

In the above structure, the accelerator pedal 21
3 is attached to the body 250 in advance, so that the vacuum pump 251 is attached to the engine room and the diaphragm actuator 201 is attached to the compartment 212 on the passenger compartment side, and the vacuum pump 251 is attached by the vacuum hose 216. By connecting the diaphragm actuator 201 and the accelerator pedal 213 with the rod 207, the constant-speed traveling device can be easily attached even if it is set as a retrofit.

<Second Embodiment> Next, as a second embodiment, the structure of a constant-speed traveling device having the control block of FIG. 1 will be described below.

FIG. 3 is a view showing a structure of a constant-speed traveling apparatus according to a second embodiment of the present invention (a main portion is shown in a cross section).

In the figure, the basic structure is the same as that of the first embodiment (FIG. 2), and the description thereof is omitted (the reference numerals of those having the same functions as those of FIG. 2 are also shown in FIG. 3). 2 is different from FIG. 2 in that the release valve 300 is not provided inside the vacuum pump 351 on the engine room side but inside the diaphragm actuator 301 on the vehicle compartment side. (In this case, the diaphragm actuator 301 has the opening 311). Thereby, even if the vacuum hose 316 is clogged for some reason,
By operating the release valve 300, the negative pressure is reliably released. In this case, since the release valve 300 is provided on the passenger compartment side, there is a concern that quietness in the passenger compartment may be impaired by the operation noise, but the operation of the release valve 300 is instantaneous when starting or ending the constant speed traveling. It is often acceptable because it works. The control line from the control unit 1 to the release valve 300 takes a route of a wire harness (not shown).

<Effects of the Embodiment> (1) The vacuum pump 251 (351) on the engine room side and the diaphragm actuator 2 on the gantry 212 (312) on the vehicle room side as the components constituting the constant speed traveling device.
01 (301), and a vacuum hose 216 (316) having a high degree of freedom in handling.
51 (351) and diaphragm actuator 201
(301). For this reason, the degree of freedom such as the position of the vacuum hose 216 (316) penetrating through the body and the position of the vacuum pump 251 (351) is increased, and the structural design on the vehicle side is facilitated, and the cost is reduced.
And the setting as a retrofit can be facilitated. (2) The release valve 300 is provided inside the diaphragm actuator 301 on the passenger compartment side, and even if the vacuum hose 316 is clogged for some reason,
By operating the release valve 300 to reliably release the negative pressure, a fail-safe mechanism can be easily realized as compared with the first embodiment.

The vacuum hose 216 (316)
For example, if the path is the same as that of the wire harness, it is not necessary to provide a dedicated through-path in the body 250 (350) at the time of manufacturing for the constant-speed traveling device. That is, it is possible to reduce the lead time at the time of manufacturing and thereby reduce the price.

Further, the accelerator pedal pulling structure of the present invention is not limited to a motor-type vacuum pump, and it is needless to say that the present invention can be applied to a system in which the throttle opening is controlled by negative pressure due to engine rotation.

[0023]

As described above, according to the present invention,
A structure of a vacuum pump-type constant-speed traveling device that simplifies the vehicle body design and can be easily set as a retrofit is realized.

[0024]

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a control block of a constant-speed traveling device as an embodiment of the present invention.

FIG. 2 is a view showing a structure of a constant-speed traveling device as a first embodiment of the present invention (a main portion is shown in cross section).

FIG. 3 is a view showing a structure of a constant-speed traveling device according to a second embodiment of the present invention (a main portion is shown in cross section).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Control unit 2 Setting switch 3 Vehicle speed sensor 200,300 Release valve 201,301 Diaphragm actuator 202,302 Diaphragm 203,204,303,304 Actuator housing 205,305 Negative pressure chamber 206,306 Pull fitting 207,307 Rod 208,308 Universal pedestal 209, 309 Hanging spring 210, 310 Rubber 212, 312 Mount 213, 313 Accelerator pedal 214, 314 Support shaft 215, 315 Throttle wire 216, 316 Vacuum hose 251, 351 Vacuum pump 252, 352 Motor 253, 353 Control valve 254, 255, 256, 354, 355, 356 Pump housing 257, 357 Eccentric rotating part 258, 358 Nroddo 259,359 pump mechanism portion 260,261,311,360,361 opening

Claims (5)

[Claims] 1. A vacuum pump type constant-speed traveling device for controlling a traveling speed of an automobile to a desired speed set by a driver, wherein a negative pressure generating means for generating a negative pressure according to the desired speed. Is provided in a place other than a vehicle room such as an engine room of the vehicle, and an accelerator pedal driving unit for driving an accelerator pedal of the vehicle is provided on a vehicle room side of the vehicle. The negative pressure generating unit and the accelerator pedal driving Means connected by negative pressure transmitting means, and the accelerator pedal driving means is driven by the negative pressure generated by the negative pressure generating means via the negative pressure transmitting means. Construction. 2. The structure of a constant-speed traveling device according to claim 1, wherein said negative pressure generating means further comprises adjusting means for adjusting said negative pressure to a value relating to said desired speed. 3. The accelerator pedal driving means,
3. The structure of the constant-speed traveling device according to claim 2, further comprising a negative pressure releasing unit that releases the negative pressure to the atmospheric pressure. 4. The accelerator pedal driving means is a diaphragm type actuator operated by the negative pressure, and transmits the operation of the actuator to the accelerator pedal via displacement transmitting means. The structure of the constant-speed traveling device according to any one of claims 1 to 3. 5. The negative pressure generating means generates the negative pressure by reciprocating a rod by rotation of a motor and operating a diaphragm and a valve by the reciprocating operation. Item 5. The structure of the constant-speed traveling device according to any one of Items 4.