JPH02283826A - Throttle control device - Google Patents

Abstract

PURPOSE:To guarantee the smooth rotation of a throttle shaft with an actuator by constituting a throttle control device such that acceleration operation force is applied to a support member for supporting a throttle lever, under the situation where the throttle lever is rotated by the acceleration operation. CONSTITUTION:At one end side of a throttle shaft 4 to the other end of which the motive power of a motor is transferred through a gear train, an U-shaped arm 22 is fixed, and flange parts 2a, 2b are formed at the side part of the arm 22 of a throttle body 2 coaxially. An annular bush 30 as a support member of the throttle lever 25 is pressure fixed in an annular space 2d which is between both the flange parts 2a, 2b. The throttle lever 25 which has a disc part 25a is mounted at a small diameter bering part 30b of the bush 30 relatively rotatably with respect to the bush 30 through a bearing 31, and one end of an acceleration cable W which is connected to the acceleration pedal at the other end thereof is engaged with a sector-shaped body part 25b.

Description

[Detailed description of the invention] [Industrial application field 1 The present invention relates to an engine throttle control device.

[Conventional Technique #i] Conventionally, this type of throttle control device suppresses engine output υ1 to prevent slippage of the drive wheels of the vehicle. I
A throttle control device that performs II and III is known, and such a throttle control device is disclosed in Japanese Patent Application Laid-Open No. 61-75024. In this device, a throttle lever is attached to the throttle shaft so as to be rotatable, and a fan-shaped arm is fixed to the throttle shaft. The throttle lever is connected to the accelerator via a wire,
The arm is connected to the actuator via a wire.

Further, the arm is set to rotate following the rotation of the throttle lever, and is also set to be rotated independently by the actuator. Then, when the throttle lever is rotated in the direction to open the throttle valve by operating the accelerator, when the arm is rotated by the actuator in the direction to close the throttle valve, the throttle shaft is rotated accordingly, and the throttle valve is opened. The opening degree is adjusted.

In addition, as other prior art, Japanese Patent Application Laid-Open No. 54-45428
No. 61-60331, Japanese Patent Application Laid-open No. 62-
There are those disclosed in Japanese Patent Publication No. 91644, Japanese Patent Application Laid-open No. 129529/1982, and Japanese Patent Publication No. 31915/1983.

[Problems to be Solved by the Invention] However, in the above device, the throttle lever is directly attached to the throttle shaft, so when the throttle lever is rotated, the accelerator operating force is transferred to the throttle shaft via the throttle lever. will be added to.

Therefore, when the throttle shaft is rotated by the actuator, a frictional force is generated between the throttle shaft and the throttle lever, which prevents the throttle shaft from rotating smoothly and reduces the accuracy of throttle valve opening adjustment. Ta.

[Means for Solving the Problems] The present invention includes a throttle lever that is rotatably provided around a throttle shaft and is operated by the depression of an accelerator, and a buttle shaft that is fixed to the throttle shaft. an arm that is biased in the direction of opening a throttle valve that opens and closes as the throttle lever rotates and is set to follow the operation of the throttle lever; and an arm that directly rotates the throttle shaft based on a throttle valve opening adjustment signal. In the throttle control device having an actuator for driving the throttle lever, the throttle lever is attached to a support member spaced apart from the throttle shirt.

[Function 1] According to the throttle device of the present invention, when the throttle lever is rotated by the accelerator operation, the accelerator operation force is applied to the support member that supports the throttle lever, and is not transmitted to the throttle shaft.

[Embodiment 1] An embodiment of the present invention will now be described with reference to the accompanying drawings.

FIG. 1 shows a throttle body 2 which defines an air supply passage 1 therein to an engine (not shown). 3
is a throttle valve disposed in the air supply passage 1 to control the air supply to the engine, and the throttle shaft 4
Fixed.

The throttle shaft 4 includes cylindrical flange portions 2a, 2a1. : @ It is supported by the rotation plate via the receivers 5, 5, and both ends protrude outside from the throttle body 2.

On one side of the throttle body 2, the flange portion 2a is provided.
A concentric cylindrical flange portion 2b surrounding the flange portion 2b is integrally formed, and a flange portion 2a corresponding to the seven flange portions 2b is integrally formed.
In the annular space 2C between the annular part 7a formed in a part of the housing 7 and the end part 6 of the annular bushing 6,
a are press-fitted and fixed to the inner circumferential surface of the flange portion 2b and the outer circumferential surface of the flange portion 2a, respectively. A worm wheel 8 is rotatably supported on the bush 6 coaxially with the throttle shaft 4, and a retaining ring 9 is provided at the end to prevent the worm wheel 8 from moving 1lfl in the axial direction.
is installed. As shown in FIG. 2, the worm wheel 8 has teeth only on a part of its circumference, and a locking pawl 10 that projects outward in the radial direction is provided on a part of the circumference that does not have teeth. ing. Note that the bushing 6 may be a member integrated with the housing 7, and a low S friction member may be arranged at the contact portion between the bushing 6 and the worm wheel 8, etc.

The housing 7 is 10a ftm of the throttle shaft 4.
A worm gear 12 fixed to the output shaft of the motor 11 is accommodated and supported in a meshing state with the worm wheel 8. The motor 11, the worm gear 12, and the worm wheel 8 are connected to the throttle. It constitutes seven cutuators 29 of the shaft 4. A locking lever 13, which will be described later and which is fixed to one end of the throttle shaft 4, is housed within the housing 7.

This results in a power transmission section from the motor 11 to the throttle shaft 4 (the power transmission action will be explained later).
is protected from the outside, and problems such as sticking and corrosion caused by muddy water canopies are prevented, and ￥! The reliability of the Ii placement will be improved. It should be noted that the worm gear 12 does not need to be fixed to the output shaft, but only needs to be connected so that it can rotate with the rotation of the output shaft.

Reference numeral 13 denotes a locking lever, which is provided with an oval-shaped hole (not shown) corresponding to an oval-shaped shaft portion 4a (see Fig. 2) formed by machining the tip of one end of the throttle shaft 4. The washer 14 is inserted into the shaft portion 4a, and the washer 14 is passed through the shaft portion 4a while being locked to a stepped portion (not shown) at the starting end of the shaft portion 4a, and the nut 15 is screwed onto the shaft portion 4a and tightened. It is set almost at right angles to the throttle shirts 1 to 4. The locking lever 13 is a locking pawl 1 formed bent on the worm wheel 8WI, which engages with the locking pawl 10 when the worm wheel 8 rotates clockwise in FIG.
6, and locking pawls 18 and 19 bent in the opposite direction to the locking pawl 16 to engage with a movable piece (not shown) of a throttle sensor 17, which will be described later. is connected to the throttle shaft 4 via the locking lever 13.
It is a rotor that transmits rotation to.

The throttle sensor 17 is installed in an opening 20 of the housing 7, which is provided at one end of the throttle shaft 4 in the vicinity of the shaft portion 4a, in a spigot shape and is located opposite to the shaft portion 4a, and is located opposite to the shaft portion 4a. The opening degree of the throttle valve 3 is detected by a movable piece (not shown) that engages with the locking pawls 18 and 13 and rotates coaxially with the throttle shaft 4. In this way, the throttle sensor 17 is attached to the housing 7 as described above that accommodates the power transmission section from the motor 11 to the throttle shaft 4, so the surrounding structure is compact. 4 and detects the opening degree of the throttle valve 3 by the rotation of a movable piece, and there is no need to use a special throttle sensor 17, which is installed in conventional throttle devices. It is possible to reuse the general structure of
￥J construction costs are low. Note that the structure of such a throttle sensor is well known, and detailed explanation will be omitted.

Reference numeral 21 denotes a control circuit to which an output signal from the throttle sensor 17 and an output signal from a sensor (not shown) that detects the speeds of driving wheels and non-driving wheels of a heavy vehicle are inputted.

1i control circuit 21 determines the slippage of the drive wheel from the speed detection signal and outputs an output signal to the motor 11 to drive the motor 11 of the actuator 29, and connects the worm wheel 8 via the worm gear 12 as shown in FIG. The throttle sensor is rotated clockwise from the initial position (the position where the locking pawl 16 and the locking pawl 10 do not engage when the locking lever 13 rotates due to the rotation of the throttle shaft 4 due to the accelerator operation). 17 detects the opening degree of the throttle valve 3, and the throttle shaft 4 is moved to a predetermined opening degree by engagement between the rotor of the actuator 29, that is, the locking pawl 10 of the worm wheel 8, and the locking pawl 16 of the locking lever 13. It has a function of rotating the worm wheel 8 and, when there is no slippage, driving the motor 11 in the opposite direction to return the worm wheel 8 to its initial position. Incidentally, the configuration of such an il, 1ItA circuit 21 is also well known, and detailed explanation will be omitted.

On the other hand, a flange portion 2 is provided on the other side of the throttle body 2.
A concentric cylindrical flange F112b surrounding a is integrally formed, and a dark annular space 2d between the flange portion 2b and the corresponding flange portion 2a has an annular flange F112b as a support member for the throttle lever, which will be described later. The bush 30 is press-fitted with its large diameter portion 3Qa pressed onto the inner peripheral surface of the flange portion 2b. Small diameter portion 30b of bushing 30
The inner diameter of the throttle shaft 4 is slightly larger than the outer diameter of the throttle shaft 4. The throttle shaft is inserted into the small diameter portion 30b of the mouth in a non-contact manner, and the other end thereof protrudes outward from the small diameter portion 30b.

A U-shaped arm 22 is attached to the other end of the throttle shaft 4.
is fixed. The arm 22 is the throttle shaft 4
The leg part 22a is provided with a circular hole (not shown) that approximately corresponds to the diameter of +1, and the other tip ◇ of the slots 1 to 4 is formed as shown in FIG. The leg portion 22b is provided with an oval-shaped hole (not shown) corresponding to the oval-shaped shaft portion 4b, and the leg portion 22b is connected to a stepped portion (not shown) at the starting end of the oval-shaped shaft portion 4b. ), pass the washer 23 through the shaft portion 4b, and insert the nut 2 into the shaft portion 4b.
4 is screwed together and tightened to secure it to the throttle shirt]・4.

25 is a throttle lever that is attached to the small diameter portion 30b of the bushing 30 via a bearing 31 and has a disc portion 25a that is rotatable relative to the bushing 30, and as shown in FIG. It has a sector-shaped main body part 25b whose other end locks one end of the connected accelerator cable W, and both ends of this main body part 25b are formed by two arm parts 25d and 25e that are substantially perpendicular to the throttle shaft 4. It is integrally connected to the disk portion 25a via. Further, a retaining ring 33 is attached to the end of the small diameter portion 30b of the pusher 130 to prevent the bearing 31 from coming off.

A first coil spring 26 is inserted into a bearing 31 between the disc portion 25a of the throttle lever 25 and the sicolder portion 30C of the bushing 30, and one end of the first coil spring is latched to a pin 27 projecting from the throttle body 2. The other end is locked to a protrusion 25f integrally formed on the disk portion 25a of the throttle lever 25. This first coil spring 26 always biases the throttle lever 25 against the throttle shaft 4 in the counterclockwise a1 direction in FIG. As will be explained later, it serves to bias the throttle valve 3 in the opening direction.

28 is a second coil spring attached to a sleeve 32 inserted into the throttle shaft 4 between the legs 22a and 22b of the arm 22, and one end of which is attached to the sleeve 32,
2, and the other end is locked to a protrusion 25c formed on an arm portion 25d of the throttle lever 25. The second coil spring 28 biases the arm 22 in the clockwise direction in FIG.
It is in contact with a protrusion 25c formed at 5d. Therefore, the relative angular position between the throttle shaft 4 and the throttle lever 25 is elastically maintained by the second coil spring 28.

In the illustrated embodiment, the second coil spring 28 is set to be weaker than the first coil spring 26.

Next, the operation of the above embodiment will be explained.

First, when the accelerator is released, the throttle shaft 4 is moved by the first coil spring 26 to the throttle lever 25.
Further, the throttle valve 3 is biased in the counterclockwise direction in FIG. 3 via the arm 22, and the throttle valve 3 is kept closed as shown in FIG. 3 and in FIGS. 1 and 2.

From this state, depress the accelerator pedal and
When the lever 25 is rotated clockwise in FIG. 3 against the first coil spring 26 via the accelerator wire W, the throttle shaft 4 is moved
Due to the urging force of the arm 22, the throttle valve 3 is rotated in the same direction as the arm 22, and the throttle valve 3 is opened and finally becomes fully open as shown in FIG. When the accelerator pedal is depressed, the throttle shaft 4 returns to its original position by the force of the first coil spring 26, and the throttle valve 3 is opened again. Therefore, the throttle valve 3 opens and closes following the accelerator operation.

Next, 1ill IE when pressing the accelerator pedal
When the circuit 21 detects slippage of the drive wheel, the two actuator motors 11 are driven to drive the worm wheel 8.
That is, the rotor rotates clockwise via the worm gear 12 from the initial position shown in FIG. The engagement between the locking pawl 10 and the locking pawl 16 of the locking lever 13 rotates the throttle valve 3 in the closing direction to a predetermined opening degree as shown in FIG. When the throttle shaft 4 rotates in this manner, the arm 22 also rotates following this rotation, but as shown in FIG. 6, the throttle lever 25 is held in position by depressing the accelerator pedal. Therefore, the arm 22 rotates relative to the throttle lever 25 against the second coil spring 28.

Therefore, only the throttle shaft 4 and the arm 22 rotate while the throttle lever 25 maintains the rotation position corresponding to the depression of the accelerator. In this case, the throttle lever 25 is connected to the bushing 30 as described above.
Since it is separated from the throttle shaft 4 by
The accelerator depression force is not applied to the throttle shaft 4 via the throttle lever 25, and the throttle shaft 4 is rotated smoothly. Therefore, accurate opening degree υl@ of the throttle valve 3 is possible. ! , II control circuit 21 can drive the motor 11 in the opposite direction to return the worm wheel 8 to its initial position if the slip disappears due to a decrease in engine output, and can perform normal opening adjustment of the throttle valve 3 using the accelerator pedal. .

In addition, the above-mentioned return of the A-m wheel 8 to the initial position is as follows.
The control circuit 21 may calculate the return tilt based on the throttle valve opening signal detected by the throttle sensor 17 and drive the motor 11 based on this, or the worm wheel 8 may be moved to the housing 7. The driving of the motor 11 may be stopped when the motor 11 rotates to a suitably provided mechanical stop position.

Furthermore, in the above embodiment, the second coil spring 28
The narrow end (the end opposite to the end that is locked to the arm 22) may be locked to the throttle body 1 instead of the throttle lever 25. In this case, the first coil spring 26 must be set to be stronger than the second coil spring 28.

The throttle υ) control device of the above embodiment allows the actuator to rotate the throttle shaft via a worm wheel and a locking lever, and there is no need to use a large number of complicated parts. Simplification,
Downsizing the entire device, and even more! The manufacturing cost can be reduced, and since the rotation of the worm wheel is reliably transmitted through engagement with the locking lever, control accuracy is high.

[Effect of the Invention 1] In the throttle control device of the present invention, the accelerator operating force is applied to the support member that supports the throttle lever, and is not transmitted to the throttle shaft. Therefore,
The throttle shaft is rotated smoothly by the actuator, and the accuracy of throttle valve opening adjustment is improved.

[Brief explanation of drawings]

The figures show one embodiment of the present invention. Fig. 1 is a front view in half section of a throttle body equipped with a throttle flill'a device, and Fig. 2 is a front view showing a throttle body with a throttle sensor removed. Figure 1 is the left side view, Figure 3 is the 1st
4 is a side view similar to FIG. 2, with the throttle control device inactive and the throttle valve in the fully open position, and FIG. 5 is a side view with the throttle sub-device in operation. 6 is a side view similar to FIG. 3 in a state similar to FIG. 5; FIG. 6 is a side view similar to FIG. 2...Thrower 1 to body 3...Throttle valve 4...Throttle shaft 8...Worm wheel (rotor) 11...Motor 12...Worm gear 22...Arm 25 ...Throttle lever 29...7 Kuchuyuator 30...button

Claims (1)

[Scope of Claims] A throttle lever that is rotatably provided around a throttle shaft and is operated by depressing an accelerator, and a throttle lever that is fixed to the throttle shaft and opens and closes as the throttle shaft rotates. It has an arm that is biased in the direction of opening the throttle valve and is set to follow the operation of the throttle lever, and an actuator that directly rotates the throttle shaft based on the throttle valve opening adjustment signal. A throttle control device, wherein the throttle lever is attached to a support member spaced apart from the throttle shaft.