JPS5823712Y2 - Internal combustion engine idle up device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an idle up device for an internal combustion engine.

A power steering device that uses the discharge pressure of an engine-driven hydraulic pump is known as a device that uses hydraulic pressure to reduce steering force.

However, this type of power steering device requires a large amount of hydraulic pressure during stationary operation (when the steering wheel is turned all at once while the vehicle is stopped or is being driven at an extremely low speed). There is a problem in that the proportion of the engine output that is consumed by the pump increases, and as a result, the idling rotation speed of the engine decreases, making it easy for the engine to stop.

In order to solve this problem, the throttle valve is opened from the idling position when the power steering system is activated in response to changes in the oil pressure in the hydraulic conduit that supplies hydraulic fluid from the power steering hydraulic pump to the power steering system. For example, an idle-up device that maintains the idle-up opening at a predetermined idle-up opening is disclosed in U.S. Patent No. 302.
It is known as described in US Pat. No. 2,849.

However, recently, many vehicles are equipped with a car cooler, and since this car cooler is driven by the engine, even when the car cooler is in operation, a large proportion of the engine output is used to drive the car cooler.

Therefore, even if the throttle valve is simply held at the idle-up opening during the stationary operation as described above, if the car cooler is activated when the stationary operation is not performed, the engine idling rotation speed will decrease, and the engine This causes the problem that the system stops and starts running.

On the other hand, in order to solve this problem, a negative pressure diaphragm device is provided to engage with the throttle valve and maintain the throttle valve at the idle-up opening position, and the negative pressure applied to the negative pressure chamber of the negative pressure diaphragm device is An idle up device that controls the engine using electrical means was published in Japanese Patent Application Laid-Open No. 52-53.
It is described in Publication No. 328.

In this idle up device, the throttle valve is opened at an idle up opening degree of 1 during a stationary operation or when the car cooler is activated, so it is possible to prevent the engine from stopping even when the car cooler is activated.

However, in this idle-up device, changes in oil pressure are detected electrically, so there is a mechanical element, such as a plunger, that moves due to changes in oil pressure, and an electrical element, such as a switch, that is activated by this plunger. Therefore, there is a problem in that the manufacturing cost of the idle-up device becomes high.

Further, when such an electric means is used, there is a problem in that poor contact is likely to occur when the engine is constantly subjected to vibrations, such as in an internal combustion engine.

Therefore, the reality is that it is desirable to avoid using such electrical means as much as possible in internal combustion engines.

An object of the present invention is to provide an idle-up device that has a simplified structure and improved reliability by mechanically detecting changes in oil pressure.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, 1 is an engine main body, 2 is an intake manifold, 3 is a carburetor, 4 is a carburetor throttle valve, 5 is an engine-driven hydraulic pump, 6 is a handle, and 7 is a power steering gear.

The discharge pressure of the hydraulic pump 5 is applied to the power steering gear 7 via a hydraulic supply conduit 8 , while hydraulic oil is returned from the power steering gear 7 to the hydraulic pump 5 via a hydraulic return conduit 9 .

As shown in FIG. 1, the throttle valve 4 is fixed to a throttle shaft 10, and an arm 11 is fixed to an end of the throttle shaft 10. As shown in FIG.

On the other hand, another arm 12 is rotatably mounted on the throttle shaft 10, and an adjustment screw 14 that can come into contact with the protrusion 13 of the arm 11 is screwed onto the lower right end of this arm 12.

On the other hand, referring to FIG. 1, a negative pressure diaphragm device 30 for driving the throttle valve 4 and a hydraulically operated valve 29 for controlling the drive of the negative pressure diaphragm device 30 are provided.

A movable plunger 19 is inserted into the hydraulically operated valve 29, and an oil leak prevention 01J ring 20 is attached to the center of the movable plunger 19.

Additionally, a hydraulic chamber 2 formed at the lower end of the movable plunger 19
1 is connected to a hydraulic supply conduit 8.

Note that the throttle valve 4 is always biased clockwise by a spring (not shown).

On the other hand, the negative pressure diaphragm device 30 has a negative pressure chamber 32 and an atmospheric pressure chamber 33 separated by a diaphragm 31, and this diaphragm 31 is connected to the arm 1 through a control rod 34.
It is connected to the lower end of 2.

On the other hand, a compression spring 35 is inserted into the negative pressure chamber 32, and the spring force of the compression spring 35 constantly presses the diaphragm 31 toward the left.

Further, the negative pressure diaphragm device 30 is provided with a negative pressure delay valve 57 having a first chamber 37 and a second chamber 38 separated by a partition wall 36, and the second chamber 38 is connected to the negative pressure chamber 32. .

Note that a check valve 39 and a throttle 40 are provided on the partition wall 36 to allow flow only from the second chamber 38 to the first chamber 37 .

A movable valve 42 is arranged in an upper chamber 41 of the hydraulically operated valve 29, and this movable valve 42 is connected to a lower chamber 4 via a valve rod 43.
4, which is connected to a disk 45 located within 4.

Normally, the disk 45 is lowered by the spring force of the compression spring 46, so that the valve port 47 communicating the upper chamber 41 and the lower chamber 44 is closed by the movable valve 42.

As shown in FIG.
8 to the upstream side of the carburetor venturi section B, and on the other hand to the first chamber 37 via a conduit 49 .

Additionally, the lower chamber 44 is connected via a negative pressure conduit 50 into the intake manifold 2 downstream of the throttle valve.

Further, as shown in FIG.
The negative pressure chamber 32 is connected to the negative pressure conduit 50 via a negative pressure delay valve 58, a negative pressure conduit 51, and an electromagnetic cutoff valve 52.

The negative pressure delay valve 58 has a check valve 59 that allows flow only from the negative pressure chamber 32 to the electromagnetic cutoff valve 52 , and a throttle 60 arranged in parallel with the check valve 59 . is the switch 5 which is interlocked with the activation switch 54 of the car cooler 53.
5 to a power source 56.

This electromagnetic cutoff valve 52 is normally closed, and opens when the operation switch 54 is turned on and the car cooler 53 is operated.

FIG. 1 shows a case where the steering wheel is hardly turned to the right or left.

At this time, since the discharge pressure of the hydraulic pump 5 is small, the movable plunger 19 is in the position shown in FIG. It is connected to the upstream side of the carburetor venturi section B through the carburetor venturi section B.

In this way, the inside of the negative pressure chamber 32 becomes almost atmospheric pressure, so the diaphragm 31 is moved to the left by the spring force of the compression spring 35, and as a result, the throttle valve 4 reaches the idling opening indicated by the solid line in FIG. is maintained.

On the other hand, during the stationary operation, the discharge pressure of the hydraulic pump 5 increases, so the movable plunger 19 rises against the compression spring 46, and as a result, the movable valve 42 closes the atmosphere communication pipe 48.

Therefore, at this time, the negative pressure inside the intake manifold 2 is reduced to the negative pressure conduit 5.
0, lower chamber 44, valve port 47, upper chamber 41, conduit 49
The negative pressure is also applied to the negative pressure chamber 32 via the check valve 39.

As a result, the diaphragm 31 moves to the right against the compression spring 35, the adjustment screw 14 of the arm 12 comes into contact with the protrusion 13 of the arm 11, and the throttle valve 4 is thus set to the idling opening as shown by the broken line. The idle-up opening will be held at a slightly larger idle-up opening.

On the other hand, when the steering wheel is hardly turned to the right or left and the car cooler 53 is operating, the electromagnetic cutoff valve 52 is open, so the negative pressure chamber 32 and the second chamber 38 are connected via the negative pressure conduit 51. It is connected within the intake manifold 2.

At this time, since the first chamber 37 is connected to the upstream side of the carburetor venturi section B via the atmosphere communication pipe 48, the first chamber 37 is
7 is at almost atmospheric pressure, but the first chamber 37 and the second chamber 3
8 and 8 are connected to each other only through the throttle 40, the inside of the negative pressure chamber 32 is maintained at a negative pressure, and thus when the car cooler 53 is operating, the throttle valve 4 is in the idle link state as shown by the broken line. The idle up opening is held at an angle that is slightly larger than the opening angle.

As described above, according to the present invention, changes in oil pressure during stationary operation are directly utilized to control the negative pressure applied to the negative pressure chamber of the negative pressure diaphragm device.

As a result, there are no contact failures that occur when negative pressure is controlled electrically in the past, and the use of fewer electrical parts reduces manufacturing costs and improves reliability. There is also the advantage of being able to do so.

[Brief explanation of the drawing]

FIG. 1 is an overall view of the idle up device according to the present invention. 3... Carburetor, 4... Throttle valve, 5... Hydraulic pump, 7... Power steering gear, 8... Hydraulic pressure supply conduit, 9... Hydraulic pressure return conduit, 29... Hydraulic pressure Operating valve, 30... Negative pressure diaphragm device, 34... Control rod, 52... Electromagnetic cutoff valve, 53... Car cooler.

Claims (1)

[Scope of utility model registration request] A power steering device, a hydraulic pump for supplying hydraulic oil to the power steering device, and a throttle control device when the power steering device is operated in response to changes in oil pressure in a hydraulic conduit that supplies hydraulic fluid from the hydraulic pump to the power steering device. In an idle-up device that maintains a valve at an idle-up opening that is slightly opened rather than from an idling opening, there is a negative pressure responsive type that can engage with a throttle valve to maintain the throttle valve at the idle-up opening. a diaphragm device, and a hydraulic pressure that responds to the hydraulic pressure in the hydraulic conduit and communicates with the intake manifold when the hydraulic pressure exceeds a predetermined pressure and communicates with the atmosphere when the hydraulic pressure falls below the predetermined pressure. an actuating valve; and a negative pressure delay valve inserted into a conduit communicating between the negative pressure chamber of the diaphragm device and the hydraulically actuated valve, the negative pressure delay valve being connected to the hydraulically actuated valve from the negative pressure chamber. The negative pressure chamber is intercepted by a check valve that allows flow toward the vehicle and a throttle arranged in parallel with the check valve, and is further connected to the negative pressure chamber through an electromagnetic cutoff valve that opens when the car cooler is activated in response to the operation of the car cooler. is connected to the intake manifold, and when the hydraulic pressure in the hydraulic conduit exceeds the above pressure, or at least when the car cooler is activated, negative pressure is introduced into the diaphragm negative pressure chamber to control the throttle. An idle-up device for an internal combustion engine that maintains the valve at the idle-up opening.