JPH02283828A - Throttle control device - Google Patents

Abstract

PURPOSE:To rotate an arm with a throttle lever by allowing a lever part mounted on the arm to engage with the throttle lever in the case where the arm can not be interlocked with the operation of the throttle lever from the position corresponding to the full open position of a throttle valve. CONSTITUTION:A U-shaped arm 22 is fixed to one end of a throttle shaft 4 to the other end of which the motive power of a motor is transferred through a gear train, and an annular bush 30 is pressurefixed in an annular space 2d which is formed at a side of the arm 22. A throttle lever 25 is mounted rotatably which has a disc part 25a at a small diameter bearing part 30b of the bush 30, and one end of an acceleration cable W is engaged with a sectional body part 25b. At an extending part 22c which is formed at the arm 22, a vibration lever 34 is mounted with a pin 35 so as to vibrate freely, and at the time when the arm 22 is not possible to from the position which is corresponding to the full open position of a throttle valve 3, it is engaged with the throttle lever 25.

Description

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

[Prior art 1 Conventionally, this type of throttle is used! As a throttle control device, there is a known throttle control device that controls the engine output to prevent the drive wheels of the vehicle from slipping, and such a throttle control device is disclosed in Japanese Patent Application Laid-open No. 75024/1983. There is something. 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, and 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 of listening to the throttle valve by the accelerator operation, when the arm is rotated by the actuator in the direction of closing the thrower valve, the throttle shaft is rotated accordingly.
The opening degree of the throttle valve is adjusted.

In addition, as other prior art, Japanese Patent Application Laid-Open No. 54-45428
There are those disclosed in Japanese Patent Application Laid-open No. 61-60331, Japanese Patent Publication No. 11''1, Japanese Patent Application Publication No. 62-91644, Japanese Patent Application Publication No. 62-129529, and Japanese Patent Publication No. 51-31915.

[Problem to be Solved by the Invention 1 In the above aa, the throttle 1-
When the lever is rotated, the arm is rotated accordingly. As a result, the throttle shaft fixing the arm is rotated, and the throttle valve attached to this throttle shaft is opened and closed. However, in this device, the rotational force of the arm depends on the urging force of the spring portion H. Therefore, if freezing occurs around the throttle valve, or if a foreign object gets between the throttle valve and the throttle body, it will not be possible to open the throttle valve by rotating the arm using only the biasing force of the spring member. Sometimes.

[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; an arm that is biased in the direction of opening a throttle valve that opens and opens with the movement of the throttle lever, and is set to follow the movement of the throttle lever; and a throttle shaft that is directly driven to rotate based on a direct adjustment signal of the throttle valve. In the throttle control device, a lever member is attached to the arm and is movable with respect to the arm, and the lever member is configured to move the arm from a position corresponding to a fully closed position of the throttle valve to the throttle lever. It is set to engage with the throttle lever when it is driven and cannot rotate.

[Function] According to the throttle control device of the present invention, when the arm cannot follow the operation of the thrower 1 to thrower lever from the position corresponding to the fully closed position of the throttle valve, the arm
The deflected lever member engages with the throttle lever. As a result, the rotational force of the throttle lever is directly applied to the arm, inducing rotational movement of the arm.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, a throttle body 2, which forms an air supply passage 1 to an engine (not shown) therein, is small. 3
is a throttle valve arranged in the air supply passage 1 to control the amount of air supplied to the engine, and the throttle shaft 4
is fixed.

The throttle shaft 4 has bearings 5.2a mounted on cylindrical flange portions 28.2a integrally formed on both sides of the throttle body 2.
The throttle body 2 is rotatably supported through the throttle body 5, and both ends thereof protrude outward 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 flange portion 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 seven flange portions 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 attached to the end of the bush 6 to prevent the worm wheel 8 from coming off in the axial direction. 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, or a low-friction member may be arranged at the contact portion between the bushing 6 and the worm wheel 8, etc.

The housing 7 is formed to surround one end side of the throttle shaft 4, and 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, worm gear A712, and worm wheel 8 constitute an actuator 29 of the throttle shaft 4. The housing 7 further accommodates a locking lever 13 fixed to one end of the throttle shaft 4 and described later.

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 are prevented, improving the reliability of the device. It should be noted that the A-mgya 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. The throttle shaft 4 is fixed at a substantially right angle to the throttle shaft 4. The locking lever 13 includes a locking pawl 16 bent on the worm wheel 8 side, which engages with the locking pawl 10 when the worm wheel 8 rotates clockwise in FIG. 2, and a throttle to be described later. It has locking pawls 18 and 19 bent in the opposite direction to the locking pawl 16 to engage with a movable piece (not shown) of the sensor 17, and the worm wheel 8 is inserted through the locking lever 13. This serves as a rotor that transmits rotation to the throttle shaft 4.

The throttle sensor 17 is installed in an opening 20 of the housing 7, which is provided at one end of the throttle switch 1 shift 4 in the vicinity of the shaft 4a, in a spigot shape, and is located opposite the shaft 4a. Locking claws 18 and 19 of the stop lever 13
The opening degree of the throttle valve 3 is detected by a pT first piece (not shown) that engages with the throttle shaft 4 and rotates coaxially with the throttle shaft 4. In this way, the throttle sensor 17 is attached to the housing 7 as described above, which accommodates the power transmission section from the motor 11 to the throttle shaft 4, so the surrounding structure is compact, and the throttle sensor 17 is installed coaxially with the throttle switch 1 shift 4 and detects the opening degree of the throttle valve 3 by the rotation of a movable piece.There is no need to use a special throttle sensor 17, and it can be replaced with the conventional throttle sensor 17. Since the general structure mounted on the throttle device can be used, the manufacturing cost can be reduced. 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) for detecting the speeds of the three driving wheels and non-driving wheels of the vehicle are input.

The control circuit 21 determines the slippage of the driving wheels from the speed detection signal and outputs an output signal to the motor 11 to drive the actuator 2.
The motor 11 of 9 is driven, and the worm wheel 8 is moved to the initial position shown in FIG. 16 and the locking pawl 10), the throttle shaft 4 is rotated clockwise from the position where the engagement between the locking pawl 16 and the locking pawl 10 does not occur, and the throttle shaft 4 is moved to the rotor of the actuator 29, that is, the worm wheel 8 The worm wheel 8 is rotated to a predetermined opening degree by engagement between the locking pawl 10 of the locking pawl 16 of the locking lever 13, and when there is no more slippage, the motor 11 is driven in the opposite direction to return the worm wheel 8 to its initial position. It has a function. Note that the configuration of such a control 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 part 2b surrounding a is integrally formed, and a flange part 2 corresponding to this flange part 2b
In the annular space 2d between the flange 2b and the flange 2b, an annular bushing 30 serving as a support member for a throttle lever, which will be described later, is press-fitted and fixed with its large diameter portion 30a pressed against the inner circumferential surface of the flange portion 2b. The inner diameter of the small diameter portion 30b of the bushing 30 is formed to be slightly larger than the outer diameter of the throttle shaft 4. And the throttle shaft is this small diameter part 3
0b in a non-contact manner, and the other end protrudes outward from this small diameter portion 30b.

A U-shaped arm 22 is provided at the other end of the throttle shaft 4.
is fixed. The arm 22 is the throttle shaft 4
As shown in FIG.
An oval-shaped shaft portion 4b formed by processing the other tip of the
A leg 22 with an oval-shaped hole (not shown) corresponding to the
b, and with the leg portion 22b locked to the step (not shown) at the starting end of the oval-shaped shaft portion 4b, the washer 23
is fixed to the throttle shaft 4 by passing it through the shaft N 4 b, screwing the nut 24 onto the shaft portion 4b, and tightening it.

An extension 22c is formed on the arm 22, and a swing lever 34 is rotatably attached to the extension 22C via a pin 35. The swing lever 34 is integrally formed with a locking piece 34a, locking claws 34b and 34C, and is provided with a cylindrical portion 34d which is rotatably inserted into the bottle 35. Further, a relief spring 36 is inserted through the cylindrical portion 34d of the swing lever 34. Both ends of the relief spring 36 are engaged with the swing lever 34 and the arm 22, respectively, and bias the swing lever 34 against the bin 35 in the counterclockwise direction in FIG. Further, a retaining ring 37 is attached to the end of the bin 35 to prevent the swing lever 34 from coming off.

Reference numeral 25 includes a disk portion 25a, a sector-shaped main body portion 25b integrally attached to the disk portion 25a, and a local portion 25.
This is a throttle lever consisting of e. The throttle lever 25 is relatively rotatably attached to the small diameter portion 30b of the bushing 30 via its cylindrical portion 25e, and the other end of the throttle lever 25 is connected to an accelerator pedal (not shown) as shown in FIG. One end of the accelerator cable W is locked. Further, a retaining ring 33 is attached to the end of the small diameter portion 30b of the bushing 30 to prevent the throttle lever 25 from coming off.

Reference numeral 26 denotes a first coil spring inserted into the cylindrical portion 25e of the throttle lever 25 between the disc portion 25a of the throttle lever 25 and the cylinder portion 30C of the bushing 30, and one end of which is connected to a stay 27 protruding from the throttle body 2. The other end is locked to a protrusion 25f formed integrally with the disk portion 25a of the throttle lever 25. This first coil spring 26 always keeps the throttle lever 25 in the third position relative to the throttle shaft 4.
It is biased counterclockwise in the figure, that is, in the opposite direction to the direction in which the accelerator cable W is pulled through the accelerator cable W by operating the accelerator, and has the role of biasing the throttle valve 3 in the opening direction as described below.

Note that the first coil spring 26 is set to be stronger than the relief spring 36.

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 integrally formed on the disk portion 25a of the throttle lever 25. The second coil spring 28 biases the arm 22 in the horizontal direction in FIG.
A part of the extension part 22c formed on the leg part 22a of No. 2 (the trapezoidal convex part in the figure) is in contact with a protrusion 25G formed on the disk part 25a of the throttle lever 25. For this reason, the throttle shaft 4 and the throttle lever 25
The relative angular position is elastically held 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.

Reference numeral 27a denotes a screw attached to the stay 27, and is set to come into contact with the locking pawl 34b of the swing I-flange 34. When the accelerator is not operated and the throttle valve 3 is in the closed position, the arm 22 moves the throttle lever 2
5, the lower surface of the locking pawl 34b of the swing lever 34 comes into contact with the screw 27a, as shown in FIG. Roughly, as mentioned above, the relief spring 36 is connected to the first coil spring 2.
6, the swing lever 34 is rotated clockwise, and the swing lever 34 is rotated clockwise as shown in FIG.
The locking pawl 34b is held between the screw 27a and the extension portion 22C of the arm 22. Further, in this state, the locking piece 34a of the swing lever 34 is located apart from the protruding piece 25G of the throttle lever 25, and is positioned one position on the rotational trajectory of the protruding piece 25c. The screw 27a can be adjusted in the vertical direction in FIG. 3, and by adjusting the screw 27a, the fully closed position of the throttle valve 3 can be adjusted.

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 counterclockwise 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, when the accelerator pedal is depressed and the throttle lever 25 is rotated clockwise in FIG. The urging force causes the throttle valve 3 to rotate together with the arm 22 in the same direction, and the throttle valve 3 opens and finally becomes fully closed as shown in FIGS. 5 and 6. When the accelerator pedal is released, the throttle shaft 4 returns to its original position by the force of the first coil spring 26, and the throttle valve 3 closes again.

Therefore, the throttle valve 3 opens and closes following the accelerator operation.

Here, the operation of the swing lever 34 when the accelerator pedal is depressed from the fully closed state of the throttle valve 3 shown in FIG. 3 will be explained. When the arm 22 rotates clockwise as a result of the clockwise rotation of the throttle lever 25, the swinging lever 34 keeps its locking pawl 34b in contact with the screw 27a due to the urging force of the relief spring 36. It is rotated counterclockwise around the bottle 35 while maintaining the same position. The swing lever 34 then rotates until the locking claw 34C and the extension portion 22c of the arm 22 come into contact with each other, as shown in FIG. Note that, as shown in FIG. 4, at this point, the locking piece 34a of the swing lever 34 is out of the rotational trajectory of the protruding piece 25C of the throttle lever 25. The operation of the swinging lever 34 is stopped by the contact between the locking claw 34G and the extension part 22G of the arm 22, and even if the arm 22 is further rotated from the state shown in FIG. 4, the swinging lever 34 maintains that state. It turns out.

Next, when the control circuit 21 detects slippage of the driving wheels when the accelerator pedal is depressed, the motor 11 of the actuator 29 is driven, and the worm wheel 8 is moved from the initial position shown in FIG. 2 or 5 via the worm gear r12. The throttle shaft 4 is rotated clockwise and the throttle shaft 4 is connected to the locking pawl 10 of the worm wheel 8 and the locking lever 13 while the throttle sensor 17 detects the opening degree of the throttle valve 3.
As shown in FIG. 7, the throttle valve 3 is rotated in the direction of opening to a predetermined opening degree by engagement with the locking claw 16. As shown in FIG. When the throttle shaft 4 rotates in this manner, the arm 22 also rotates following this rotation.
As shown in FIG. 8, since the throttle lever 25 is held in position by pressing the accelerator pedal, the arm 22 rotates relative to the throttle lever 25 against the second coil spring 28. As shown in FIG. In this case, the locking piece 34a of the swing lever 34 is connected to the protruding piece 2 of the throttle lever 25.
5c, the locking piece 34a and the protruding piece 25c do not engage with each other, and the rotation of the arm 22 is not inhibited. Therefore, the throttle lever 25
Only the throttle shaft 4 and the arm 22 rotate while maintaining the rotation position corresponding to the depression of the accelerator.

Further, in this case, since the throttle lever 25 is separated from the throttle shaft 4 by the bushing 30 as described above, the accelerator depression force is not applied to the throttle shaft 4 through the throttle lever 25, and 4 rotates smoothly. Therefore, accurate control of the opening of the throttle valve 3 is possible.

When the slip disappears due to a decrease in engine output, the control circuit 21 drives the motor 11 in the reverse direction to return the worm wheel 8 to its initial position, allowing the normal 1711 degree adjustment of the throttle valve 3 by the accelerator pedal.

Note that the return of the worm wheel 8 to the initial position is as follows:
The return amount may be calculated by the υItE circuit 21 based on the throttle valve opening signal detected by the throttle sensor 17, and the motor 11 may be driven based on this, or the worm wheel 8 may be The drive of the motor 11 may be stopped when the motor 11 rotates to a mechanical stopper position appropriately provided.

Furthermore, in the above embodiment, the second coil spring 28
The other 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.

In the throttle control device of the above embodiment, the actuator rotates the throttle shaft via a worm wheel and a locking lever, and there is no need to use a large number of complicated parts, so the number of components can be simplified. In addition, since the rotation of the worm wheel is reliably transmitted through engagement with the locking lever, control accuracy is high.

Now, as you can see from the above explanation, the operation of the above embodiment is explained by pressing down on the accelerator pedal and moving the throttle lever
Although it is a prerequisite that the throttle shaft 4 rotates smoothly together with the arm 22 due to the biasing force of the second coil spring 28 when the throttle shaft 5 is rotated, a case in which this is not the case will be described next.

For example, freezing around the throttle valve 3 or the throttle valve]
- If a foreign object enters between the throttle valve 3 and the throttle body 2, and the biasing force of the second coil spring 28 is no longer able to rotate the throttle shaft 4 together with the arm 22, the accelerator pedal is released from the state shown in FIG. Even if the user depresses the pedal and rotates the throttle lever 25 in one direction as shown in FIG. 3, only the throttle lever 25 rotates as shown in FIG. 9, and the arm 22 remains in the state shown in FIG. However, when the arm 22 is in the state shown in FIG. 3, the locking piece 34a of the 11vJ lever 34 is located on the rotational trajectory of the protrusion 25C of the throttle lever 25, so the throttle lever 25 is in the state shown in FIG. When rotated clockwise, the protruding piece 25c of the throttle lever 25 is engaged with the locking piece 34a of the swing lever 34, as shown in FIG. Therefore, when the throttle lever 25 is further rotated, the arm 22 rotates as shown in FIG. i! 3 actions are induced. In this way, the rotation of arm 22 vJ
When the #1 movement is induced and the arm 22 and the throttle shaft 4 can be rotated by the biasing force of the second coil spring 28, a part of the extension portion 22C of the arm 22 is caused by the biasing force of the second coil spring 28. As a result, the arm 22 comes into contact with the protruding piece 25c of the throttle lever 25, and a state is achieved in which the arm 22 follows the rotation of the throttle lever 25 and can rotate smoothly.

Note that when the rotation of the arm 22 is induced and a part of the extension 22G of the arm 22 comes into contact with the protrusion 25c of the throttle lever 25, the engagement between this protrusion 25c and the locking piece 34a of the swing lever 34 is caused. The combination is resolved.

As a result, the swing lever 34 is moved to the relief spring 36.
10, and takes the position shown in FIG. 4 or 6.

As described above, the arm 22 is connected to the throttle lever 25.
Since the operation after reaching the state where it can smoothly rotate following the rotation of is as described above, a description thereof will be omitted.

[Effects of the Invention] In the throttle control device of the present invention, the arm moves from the position corresponding to the fully closed position of the throttle valve to the thrower i.
If the throttle lever cannot be rotated by following the throttle lever, the lever member provided on the arm will engage the throttle lever.
The rotational force of the throttle lever can induce rotational movement of the arm. Therefore, even if the throttle valve cannot be rotated from its fully closed position due to freezing around the throttle valve or intrusion of foreign matter, the device can be used, and the reliability of the device is improved.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a front view in half section of a throttle body equipped with a throttle 1111111 device, and Fig. 2 is Fig. 1 with the throttle sensor removed. 3 is a right side view of FIG. 1, FIG. 4 is a side view similar to FIG. 3 showing the throttle valve slightly rotated from the fully closed position to the open direction, and FIG. is a side view similar to FIG. 2 showing a state in which the throttle control device is inactive and the throttle valve is in a fully closed position; FIG. 6 is a side view similar to FIG. 3 in a state similar to FIG. 5; Figure 7 shows the second state in which the throttle control device is activated and the throttle valve is rotated to the closed position.
Figure 8 is a side view similar to Figure 3 in a state similar to Figure 7; Figure 9 is Figure 3 showing a state in which the arm does not follow the rotation of the throttle lever; A similar side view, FIG. 10 is a side view similar to FIG. 3, showing a state in which the throttle lever is further rotated in the case of FIG. 9. 2... Throttle body 3... Throttle valve 4... Throttle shaft 8... Worm wheel 11... Motor 12... Worm gear 22... Arm 25... Throttle lever 29 ...actuator 34...swing lever clarity 0] Fig. 10

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 rotationally drives the throttle shaft based on a direct adjustment signal of the throttle valve. In the throttle control device, a lever member movable with respect to the arm is attached to the arm, and the lever member moves from a position corresponding to a fully closed throttle valve position to a non-rotatable position by following the throttle lever. a throttle control device configured to engage said throttle lever when the throttle lever is activated;