JPH02234848A - Accelerator line device - Google Patents

Abstract

PURPOSE:To have a transmitting characteristic to be best suited to the output characteristics of an engine by transmitting the stamping amount of an accelerator pedal to a throttle lever via a plate cam, accel. level, etc., and therein varying the link ratio in accordance with the accel. operating amount. CONSTITUTION:A segment-shaped bracket 12, wherein an accel. wire 15 is detained at that arced edge 121 which is located the most apart from an accel. pedal 2, is coupled in a single piece with a plate cam 11 rotatable round No.1 pivot 111. An accel. lever 13 equipped at one end with an interlockedly moving piece 131 and an other end with a conjugate part 132 for connection with a throttle rod 3 is installed rotatably round No.2 pivot 133. The interlockedly moving piece 131 is formed in a rubber roller, which comes into contact with an approx. elliptical contour 112 of the plate cam 11. Thereby the link ratio from the plate cam 11 to accel. lever 13 is made changeable according to the rotational angle of the plate cam 11, i.e., the stamping amount of accel. pedal 2, that accomplishes a transmitting characteristic best suited to the characteristics of engine output.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an accelerator link device that transmits the amount of operation of an accelerator pedal to a throttle lever, and in particular, the transmission ratio can be varied according to the amount of operation of the accelerator pedal. This invention relates to an accelerator link device.

[Prior Art] The engine output of an automobile or the like changes depending on the amount of fuel fed into the engine. The adjustment is performed by operating an accelerator pedal via an accelerator linkage and rotating a throttle lever of the fuel injection pump.

For example, as shown in FIG. 3, the conventional accelerator link device 9 includes an accelerator link 91 having a pivot shaft 94 approximately in the center.
, an accelerator wire 92 rotatably connected to one end of the accelerator link 91 and interlocked with an accelerator pedal (not shown), and a throttle rod 93 rotatably connected to the other end of the accelerator link 91 and driving a throttle lever 95. It is equipped with

In this accelerator link device 9, when an accelerator pedal is operated, an accelerator wire 92 interlocked with the accelerator pedal pulls one end of an accelerator link 91.

Since the accelerator link 91 is pivotally supported by a pivot shaft 94 located approximately in the center, the throttle rod 93 connected to the other end is pushed out and rotates the throttle lever 95 of the fuel injection pump.

Thereby, the amount of operation of the accelerator pedal is exchanged as the amount of rotation of the throttle lever 95. At this time, the link ratio is determined by the positional relationship of the pivot shafts of the accelerator link 91.

Recently, devices that convert the operating amount of the accelerator pedal into an electric signal and control the throttle valve using this electric signal, instead of using an accelerator link device that mechanically connects the accelerator pedal and the throttle lever (for example, in actual use) Showa 63
-1833350, etc.) have been proposed.

[Problem to be Solved by the Invention 1] However, in the conventional accelerator link device, the link ratio is constant regardless of the amount of operation of the accelerator pedal. Therefore, depending on the output characteristics of the diesel engine or the like, the operating force of the throttle lever may change significantly. As a result, the force with which the accelerator pedal is pressed changes accordingly. As described above, large changes in the accelerator pedal depression force significantly reduce the operability of the accelerator. In addition, since the link ratio is constant, the engine output relative to the amount of accelerator pedal depression is determined by the engine's output characteristics, and it is extremely difficult to change those characteristics with conventional accelerator link devices. .

As a countermeasure to this problem, as described above, an electrically controlled device has been proposed that does not use a mechanical accelerator link device.

However, this device requires a detector to detect the accelerator pedal operation, a microcomputer to calculate it,
It also requires a large number of devices such as an A/D converter, a D/A converter, a servo motor that can drive the throttle valve, and a servo motor driver for that purpose. For this reason,
The cost is significantly higher and the reliability is greatly reduced due to the use of a large number of devices. Malfunctions that are more likely to occur due to reduced reliability can have a major impact, unlike mechanical accelerator link devices.

In view of these problems, the present invention has been developed to significantly improve the operability of the accelerator by changing the link ratio according to the amount of accelerator operation in a mechanical accelerator link device, and to improve the operability of the accelerator according to various purposes. The objective is to make it possible to obtain engine output characteristics with respect to accelerator operation amount.

[Means for Solving the Problem] The accelerator link device of the present invention includes a plate cam rotatable about a first pivot shaft, and an arcuate edge that is integrally connected to the plate cam and is farthest from the accelerator pedal. A fan-shaped bracket to which an accelerator wire is moored; one end has a rotor that contacts the contoured surface of the plate cam; the other end has a connecting part with a throttle rod; the bracket rotates about a second pivot shaft; It includes a movable accelerator lever and an underframe that holds both the pivot shafts.

In addition, the distance from the pivot axis to the contour surface of the plate cam here is determined by the link ratio required for the encyclical of the plate cam, and the shape of the contour surface of the plate cam is set accordingly. .

[Function] As shown in FIG. 2, the accelerator linkage device of the present invention transmits the amount of operation applied by depressing the accelerator pedal to the throttle lever via the plate cam 53, accelerator lever 55, etc. At this time, the transmission from the plate cam 53 to the accelerator lever 55 is performed by the contoured surface of the plate cam 53 pressing and moving the roller 54 provided on the accelerator lever 55, and the accelerator lever 55 is moved to the second accelerator lever 55. Rotates around a pivot shaft 58.

The contoured surface of the plate cam 53 is formed such that the distance from the first pivot shaft 57 of the portion that contacts the rotor 54 of the accelerator lever 55 varies depending on the rotation angle of the plate cam 53.

Therefore, the link ratio from the plate cam 53 to the accelerator lever 55 can be changed depending on the rotation angle of the plate cam 53, that is, the amount of operation of the accelerator pedal.

In the accelerator linkage device of the present invention, the amount of operation of the accelerator wire 51 is approximately transmitted to the throttle rod 56 as follows.

When the accelerator pedal is depressed, the accelerator wire 51 is pulled, and if the length of the tension is QIn, then the amount of movement Q of the throttle rod 56 relative to Qin is the amount of movement Q of the throttle rod 56. ，
t is approximately determined as follows.

first,! The rotation angle ψ of the plate cam 53 due to 2 inches is ψ,, where L1 is the length from the arc edge of the fan-shaped bracket 52 on which the accelerator wire 51 acts and its first pivot shaft 57.
= Father in/L3. Also, the distance between the first pivot shaft 57 and the second pivot shaft 58 is 12N, and the distance from the second pivot shaft 58 to the contact portion of the rolling element 54 with the contour surface of the plate cam 53 is 13N.
, the distance from the second pivot shaft 58 to the connecting portion with the throttle rod 56 is L4, and the included angle between L2 and L3 is θ.

The included angle θ is the angle before the accelerator pedal is depressed, and θin is the angle after the accelerator pedal is depressed. ，
When t is assumed, the following results are obtained.

Margin below - ([3 -12) ' ) / (2L2 13
)]'oat -(ti -t;) 2 )"'/(2
12 L3)] Here, 'inS'out represents the distance from the first pivot shaft 57 to the contoured surface of the plate cam 53 that comes into contact with the rotor 54 before and after depressing the accelerator pedal, respectively. That is, r
− −f (ψ), 'out ” f <group
O ψ0+ψ52). During this time, the number r=f (φ) is the plate cam 5
It is determined by the shape of the contour surface of No. 3, and is set so as to realize the desired characteristics.

The movement of the throttle rod 56 "out is crossed.,t=(
θ. ut-θil) L4·COS(π/2-φ) Here, φ is an included angle formed by L4 and the throttle rond 56.

Next, when the force Fin that pulls the accelerator wire 51 moves, the force Fout that the throttle rod 56 acts on the throttle lever can be approximately expressed as follows when the rotation angle ψ of the plate cam 53 is ψi.

In the present invention, since the fan-shaped bracket 52 is formed, the force pulled by the five accelerator wires is applied to the first pivot shaft 52.
7 to the part on which the accelerator wire 51 acts can always be substantially perpendicular to the arm.

Therefore, the rotational moment M acting on the first pivot shaft 57
in becomes M H n=F i n” L 1.

The distance from the contour surface of the plate cam 53 to the part where it comes into contact with the rotor is rψ. = f(ψi), so the force E2 acting on the rolling element 5ζ4 is xsin (tan-1('ψ;)).As a result, the force Fout acting on the throttle rond 56 is /2-φ)
/L4 where rψ is the rotation angle ψ of the plate cam 53 and f(ψ)
This is the value when ψ=ψi.

However, energy loss such as IIE friction is not taken into consideration in transmitting the above force.

In addition, in the accelerator linkage device of the present invention, L1 is not particularly limited to being unchanged with respect to the rotation angle φ, and if necessary, L1 can be made variable as a function of the rotation angle φ. Also, L2
, L3, and L4 are design items whose sizes are set at the time of design.

As described above, in the accelerator linkage device of the present invention, the plate cam 5
By variously changing the shape of the contour surface 3, arbitrary transfer characteristics can be obtained.

[Example] An accelerator link device according to an example of the present invention will be described with reference to FIG. FIG. 1 is a schematic configuration diagram schematically showing this embodiment.

The accelerator link device 1 of this embodiment transmits the operation amount of an accelerator pedal 2 used in an automobile or the like to a throttle rod 3, and its transmission characteristics can be set in various ways. Its structure consists of a plate cam 11 that can rotate around a first pivot shaft 111.
The accelerator pedal 2 is integrally connected to the plate cam 11.
A fan-shaped bracket 12 with an accelerator wire 15 moored to an arc edge 121 that is furthest away from the other end, and a connecting portion 132 that has a rolling element 131 at one end and a throttle rod 3 at the other end.
The accelerator lever 13 is rotatable around the second pivot shaft 133, and the underframe 14 holds the two pivot shafts 111 and 133.

The plate cam 11 has a contoured surface 112 having a substantially elliptical shape, and is rotatably held on the underframe 14 by a first pivot shaft 111 formed at an eccentric position. Contour surface 11
2, the distance from the first pivot shaft 111 varies greatly depending on its rotation angle.

In this embodiment, the plate cam 11 has a substantially elliptical shape, and the first pivot shaft 111 is located at one of its two reference points. Then, the distance from the first pivot shaft 111 to the contour surface 112 can be easily determined.

The fan-shaped bracket 12 is an arcuate plate-shaped bracket that is approximately the same as a disk divided into five parts. One end, which is the key point, is integrally connected to the side edge of the plate cam 11 on the side where the first pivot shaft 111 is formed. Fan-shaped bracket 1
A recessed portion 122 is formed in the circumferential direction in the arc edge 121 of the second wheel, and a mooring portion 123 for mooring the accelerator wire 15 is formed at the end of the arc edge 121 that is furthest away from the accelerator pedal 2.

The accelerator lever 13 is rotatably held on the underframe 14 by a second pivot shaft 133, and has a roller 131 at one end and a connecting portion 132 with the throttle rod 3 at the other end. It is a letter-shaped lever.

The roller 131 is a small rubber roller that is always in contact with the contoured surface 112 of the plate cam 11, and rotates very easily as the contoured surface 112 in contact with it moves.

The connecting portion 132 swingably connects one end of the throttle rod 3 and transmits the rotational force of the accelerator lever 13 to the throttle rod 3 as a linear force.

The underframe 14 is made of a rigid and robust material,
The distance between the first pivot shaft 111 of the plate cam 11 and the second pivot shaft 133 of the accelerator lever 13 is kept constant. The accelerator link device 1 of this embodiment has a first
Since it is always held by either the pivot shaft 111 or the second pivot shaft 133, the underframe 14 holds the entire accelerator link device 1 of this embodiment.

The accelerator wire 15 connects the accelerator pedal 2 and a mooring portion 123 formed on the arcuate edge 121 of the fan-shaped bracket 12 . When the accelerator pedal 2 is not depressed, the accelerator wire 15 moves from the mooring part 123 into the recessed part 122 formed in the arched edge 121.
1, and is connected to the accelerator pedal 2 from the end of the arc edge 121 opposite to the mooring portion 123. Further, when the accelerator pedal 2 is depressed the most, the accelerator wire 15 is moved from the mooring part 123 to the arc edge 1.
21, and is directly connected to the accelerator pedal 2.

The accelerator link device 1 of this embodiment configured as described above operates as follows.

First, when the accelerator pedal 2 is depressed, the accelerator wire 15 is pulled accordingly, causing the fan-shaped bracket 12 to rotate about the first pivot shaft 111 of the plate cam 11. At this time, the accelerator wire 15 gradually separates from the arc edge 121 of the fan-shaped bracket 12 from the end of the arc edge 121 closer to the accelerator pedal 2 according to the amount of tension. Note that the direction of the tensile force of the accelerator wire 15 and the arm connecting the point of action of the tensile force and the first pivot shaft 111 are the same as those of the accelerator wire 15.
Regardless of the amount of tension in 5, it is almost at right angles.

Since the plate cam 11 is integrated with the fan-shaped bracket 12, the plate cam 11 also rotates about the first pivot shaft 111 by the accelerator wire 15. Since the plate cam 11 has a substantially elliptical shape, the length from the first pivot shaft 111 to the contoured surface 112 in contact with the rotor 131 of the accelerator lever 13 corresponds to the rotation of the plate cam 11. It varies depending on the angle. Therefore, the contour surface 112 of the plate cam 11
The force in the direction of rotation changes as the length of the arm changes due to the rotational moment at . The direction in which the roller 131 of the accelerator lever 13 is pressed on the roughly contoured surface 112 also changes. As a result, the torque of the rotor 131 around the second pivot shaft 133 also changes. Then, the throttle rod 3 connected to the connecting portion 131 is moved by the torque. These approximate quantitative studies are described in the above-mentioned [Effect] section.

In this embodiment, since the plate cam has a substantially elliptical shape, the transmission characteristic when the tensile force of the accelerator wire 15 is transmitted to the throttle rod is slightly different from the linearly proportional transmission characteristic of a normal link device, and is gentle. This results in a nonlinear transfer characteristic that is upwardly convex.

[Effects of the Invention] As is clear from the above description, the accelerator link device of the present invention has a fan-shaped bracket that improves transmission efficiency so that the acting direction of the accelerator wire is always perpendicular to the rotating arm,
Since the accelerator lever is rotated through the plate cam to drive the throttle rond, by setting the plate cam to various shapes, the transmission characteristics can be varied accordingly. Therefore, for example, it is possible to mechanically realize transmission characteristics that match the characteristics of the engine output.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an accelerator link device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram illustrating its operation. FIG. 3 is a schematic diagram of a prior art accelerator linkage device. 1... Accelerator link device 2... Accelerator pedal 3... Throttle rod 11... Plate cam 12... Fan-shaped bracket 13... Accelerator lever 14... Underframe 15...
・Accelerator wire 111...first pivot shaft 112・
... Contour surface 121 ... Arc edge 131 ... Roller 132 ... Connecting portion 133 ... Second pivot shaft

Claims (1)

[Claims] (1) A plate cam that is rotatable about a first pivot shaft; a fan-shaped bracket that is integrally connected to the plate cam and has an accelerator wire moored to the arcuate edge furthest from the accelerator pedal; an accelerator lever having a rolling element that comes into contact with the contoured surface of the plate cam, and having a connecting portion with a throttle rod at the other end and being rotatable about a second pivot shaft; and holding both said pivot shafts. An accelerator link device including an underframe.