JPH11342762A - Acceleration pedal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a favorable acceleration operability by the generation of a proper friction resistance at actuating time and return time of an acceleration pedal. SOLUTION: In this device, a shaft cylinder 5 is installed stationally for a bracket 3 and a pushpress member 6 is inserted in the end of the shaft cylinder 5 and the ends of return springs 10, 11 are locked thereto. A friction plate 7 is provided so as to hold the left side wall 3a of the bracket 3 between the tip of the shaft cylinder 5 and the friction plate 7 and a friction plate 8 is provided so as to hold the right side wall 3b of the bracket 3 between the pushpress member 6 and the friction plate 8. Further, slant projections are provided so as to be engaged with each other on the end facing the shaft cylinder 5 to the pushpress member 6 and at the actuation time of an acceleration pedal 1, the twist spring forces of the return springs 10, 11 are converted to the pushpress force in an axial direction by the engagement of the slant projections and the friction resistance is produced by holding both side walls 3a, 3b of the bracket 3 between the friction plates 7, 8 by the pushpress force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accelerator pedal device for an automobile, and more particularly, to a cableless accelerator pedal device provided with an accelerator opening sensor for detecting an accelerator opening.

[0002]

2. Description of the Related Art As a cableless accelerator pedal device that electrically transmits the opening of an accelerator pedal to a throttle valve without passing through an accelerator cable, an accelerator opening sensor is conventionally mounted on a support shaft of an accelerator pedal. 2. Description of the Related Art There is known an accelerator pedal device having a structure in which an accelerator opening sensor is rotated in accordance with the amount of depression of a pedal (for example, see Japanese Patent Application Laid-Open No. 7-160348).

[0003]

In this type of conventional accelerator pedal device, an accelerator pedal arm is rotatably supported on a bracket via a support shaft, and an accelerator opening sensor is directly connected to the support shaft. In this configuration, the rotor of the accelerator opening sensor rotates according to the amount of depression of the accelerator, and a signal indicating the accelerator opening is output from the accelerator opening sensor.

Incidentally, a conventional accelerator pedal device connected to a throttle device via a cable conventionally used in a general automobile, or an electronic control type in which an accelerator pedal and an accelerator opening sensor are connected by an accelerator cable. In the accelerator pedal device, since there is sliding resistance of the accelerator cable, an appropriate amount of depressing force is generated, and the depressing force is appropriately increased in accordance with the amount of depressing the accelerator pedal, and rotation in the anti-depressing direction is performed. The sliding resistance is generated moderately even when moving, thereby improving the operability of the accelerator.

[0005] However, the above-described cableless accelerator pedal device is configured such that a frictional resistance is generated on the support shaft of the accelerator pedal only during rotation in the anti-depressing direction by the action of the one-way bearing and the friction plate.
Although an appropriate frictional resistance is generated in the anti-depressing direction, that is, when the accelerator is returned, when the accelerator pedal is depressed, the frictional resistance is small, the accelerator operation becomes unstable, and the operability may be deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has an appropriate frictional resistance when the accelerator pedal is depressed and returned, so that a good accelerator operability can be obtained. It is an object to provide a pedal device.

[0007]

To achieve the above object, an accelerator pedal device according to the present invention comprises a pedal arm having a support shaft fixed to an intermediate portion and an accelerator pedal fixed to a distal end, and a support shaft being rotated. A bracket to be supported, a return spring disposed around the support shaft to bias the pedal arm in the anti-depressing direction, and a bracket mounted on the bracket to indicate an accelerator opening according to the rotation of the pedal arm. In a cableless accelerator pedal device having an accelerator opening sensor that generates a signal, when the accelerator pedal is depressed, the torsion spring force generated in the return spring is converted into a pressing force in the axial direction of the support shaft. A friction member which presses the stationary portion by pressure to generate frictional resistance is provided rotatably with the support shaft.

[0008] Here, the above device includes a shaft cylinder fitted to the outer periphery of the support shaft and fixedly attached to the bracket, and an end of the return spring fitted to the end of the shaft cylinder. The pressing member to be locked, the first friction member disposed to sandwich the side wall portion of the bracket between the distal end portion of the barrel, and the other side wall portion of the bracket between the pressing member and the pressing member. A second friction member disposed so as to be sandwiched between the shaft cylinder and the pressing member; When the toe is depressed, the torsion spring force of the return spring is converted into an axial pressing force by the engagement of the inclined convex portion, and the pressing force presses the side wall portion of the bracket between the first and second friction members to cause friction. It can be configured to generate resistance.

Further, the friction member can be formed from a friction plate provided in a friction case.

[0010]

In the accelerator pedal device having the above-described structure, when the accelerator pedal is depressed, the support shaft rotates and the return spring is twisted in the same direction, thereby generating a torsional spring force. Is converted into a pressing force in the axial direction of the support shaft, and the friction member that rotates together with the support shaft presses a stationary portion such as a bracket by the pressing force, and a frictional resistance is generated there.

Therefore, the amount of torsion of the return spring increases in accordance with the amount of depression of the accelerator pedal, and the torsion spring force also increases. Therefore, according to the rotation width of the support shaft, that is, in accordance with the amount of depression of the accelerator pedal. As a result, the frictional resistance when the support shaft rotates increases, whereby the stepping force gradually increases, and stable accelerator operability can be obtained.

On the other hand, when the foot is released from the accelerator pedal, the pedaling force is reduced, and the support shaft is rotated by the spring force of the return spring to return the accelerator pedal to the non-depressed state. Since the frictional resistance of the friction member gradually decreases in accordance with the rotation width of the support shaft, the accelerator pedal operates to return gently, and stable accelerator operability can be obtained.

Therefore, when the accelerator pedal is operated, a tactile operation feeling can be obtained, and the accelerator operation can be performed in a stable state, so that the operability without the uncomfortable feeling similar to the conventional accelerator pedal with a cable can be obtained. Can be caused.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 shows a front view with a partial cross section of the accelerator pedal device, FIG. 2 shows a left side view thereof, and FIG. 3 shows a partially enlarged front view with a cross section. This accelerator pedal device basically includes a bracket 3 and a bracket 3
, A pedal arm 2 supported via a support shaft 4, an accelerator pedal 1 fixed to the pedal arm 2, an accelerator opening sensor 20 mounted on a bracket 3, and fitted outside the support shaft 4. The shaft cylinder 5 is provided with return springs 10 and 11 fitted around the shaft cylinder 5.

A support shaft 4 is fixed at a right angle to an intermediate portion of the pedal arm 2. The support shaft 4 has a large-diameter portion at the left end and a small-diameter portion at the right end, the pedal arm 2 is fixed to the large-diameter portion at right angles, screws are formed in the small-diameter portion, and serration portions 4a are provided at both ends of the medium-diameter portion.
Is provided. Friction plates 7, 8 are provided on the serrations 4a.
Disc-shaped friction cases 12 and 13 (FIG. 4) having outer surfaces are fitted and fixed, and bushes 14 and 15 are fitted on the support shaft 4 inside the serrations 4a.

The bracket 3 is bent perpendicularly on both sides to form a U-shaped cross section. Holes for passing the support shaft 4 through the left side wall 3a and the right side wall 3b have outer diameters of the bushes 14, 15. Drilled as a slightly larger hole. The support shaft 4 fitted with the friction case 12 holding the friction plate 7 is inserted from the outside into the hole of the left side wall 3a, and the bushes 14, 15 enter the holes of the left side wall 3a and the right side wall 3b. . At this time, the shaft cylinder 5 and the pressing member 6 are located coaxially in the bracket 3, and the support shaft 4 is inserted into the shaft cylinder 5.

The pressing member 6 is externally fitted on the small diameter portion 5c of the shaft cylinder 5, the male screw portion of the support shaft 4 projects from the hole in the right side wall of the bracket 3, and the serration portion of the protrusion of the support shaft 4 A friction case 13 for holding the friction plate 8 is fitted from the outside, and the nut 9 is screwed into the external thread portion on the outside. By tightening the nut 9, the left friction case 12
The inner friction plate 7 contacts the left side wall 3a, and the friction plate 8 in the right friction case 13 contacts the right side wall 3b.

As shown in FIG. 4, the friction cases 12, 13 are formed of, for example, a synthetic resin in the shape of a disk having a central hole into which the support shaft 4 is fitted, and have annular recesses 12a, 1 on one surface.
The annular (washer-shaped) friction plates 7 and 8 shown in FIG. 5 are inserted into the annular concave portions 12a and 13a as friction members. Projection 1 in annular recesses 12a, 13a
2b and 13b are provided, and holes 7a and 8a provided at corresponding locations of the friction plates 7 and 8 are fitted to the projections 12b and 13b, thereby preventing the rotation of the friction plates 7 and 8 in the friction case.

As shown in FIG. 6, the shaft cylinder 5 is formed in a cylindrical shape that can be fitted to the middle of the support shaft 4 and has a projection 5a on the left end surface. Part 3a
, The rotation of the barrel 5 is prevented, and the barrel 5 stops with respect to the bracket. Also,
A small diameter portion 5c is provided at the right end of the shaft cylinder 5, and the small diameter portion 5c is provided.
The pressing member 6 is rotatably fitted to c. Furthermore, the shaft cylinder 5
The inclined stepped portion 5b having an inclined surface on a side portion is provided at the intermediate step portion.
Are protruded toward the small diameter portion 5c.

As shown in FIG. 7, the pressing member 6 fitted to the small-diameter portion 5c is formed in a substantially disk shape, and when the pressing member 6 is inserted into the small-diameter portion 5c of the shaft cylinder 5 on its left side, its inclination is reduced. Convex part 5b
An inclined convex portion 6b having an inclined surface capable of engaging with the projection is provided. Further, a locking hole 6 for locking the ends of the return springs 10 and 11 which are fitted to the shaft cylinder 5 on the left side surface of the pressing member 6.
a are drilled twice. The inclined surfaces of the inclined convex portion 5b and the inclined convex portion 6b are formed in mutually opposite inclined directions so as to be able to face and contact with each other. Further, when a rotational force is applied to the pressing member 6 by the torsional force of the return spring during the depression operation of the accelerator pedal, the inclined convex portion 5b and the inclined convex portion 5b convert the rotational force into an axial pressing force. The inclination direction of the inclined surface of the portion 6b is inclined in both the rotation direction and the axial direction.

On the outer periphery of the shaft cylinder 5, a coil spring 2
The return springs 10, 11 of the book are similarly wound and sheathed.
The right ends of the return springs 10 and 11 are connected to the pressing member 6 as described above.
And the left ends of the return springs 10 and 11 are hooked on the pedal arm 2 so that the pedal arm
Is turned and biased in the anti-stepping direction.

As described above, the friction plates 7, 8 are provided on both sides of the support shaft 4.
The friction cases 12 and 13 are attached to each other, and the side walls of the bracket 3 are sandwiched between the shaft cylinder 5 disposed inside and the end of the pressing member 6. Thereby, the rotational friction resistance between the friction plate 7 and the left side wall 3a and the rotational friction resistance between the friction plate 8 and the right side wall 3b are adjusted. Therefore, by adjusting the degree of tightening of the nut 9, the rotational frictional resistance of the support shaft 4 can be adjusted, and the accelerator pedal depression speed and return speed can be adjusted to be appropriate.

The accelerator opening sensor 20 is attached to the upper left wall 3a of the bracket 3. The attachment of the accelerator opening sensor 20 is tightened and fixed by passing a fixing screw through a long hole provided on the bracket side, and the mounting angle of the sensor can be adjusted by loosening the fixing screw.

The accelerator opening sensor 20 has a rotor 21 rotatably disposed at the center thereof, and a brush is fixed to an inner end of the rotor 21 via a brush support (not shown). A substrate having a resistor pattern is attached to an inner wall facing the brush, and the brush contacts the substrate. Rotor 21
, A return coil spring 22 for urging it toward the fully closed detection position side is externally fitted.

The left end of the rotor 21 projects from the hole formed in the left side wall 3a of the bracket 3 toward the pedal arm, and a crank mechanism having the rotor 21 as a crank shaft is provided at the left end. That is, the crank arm 16 is
Is fixed at a right angle to its axis at the end of the crank arm 16
The crank pin 17 is attached to the tip of the rotor in parallel with the rotor shaft, and the rotor 21 is rotated by moving the crank pin 17 back and forth in FIG.

Further, an engaging portion is provided at the distal end of the pedal arm 2, and the engaging portion is engaged with the crank pin 17. The engaging portion fixes the band plate 18 to the distal end of the pedal arm 2 so that the crank pin 17 is inserted and held in a long hole-shaped space formed between the distal end of the arm 2 and the band plate 18 with a gap. It is formed.

With this crank mechanism, the pedal arm 2
Is tilted, the rotor 21 of the accelerator opening sensor 20 rotates according to the amount of depression of the pedal arm 2. A stopper 19 made of a synthetic resin is mounted on the bracket 3 behind the engaging portion, and the tip of the pedal arm 2 when not operated comes into contact with the stopper 19 and stops.

The accelerator pedal device having such a structure is as follows.
Like a normal automobile, the bracket 3 is attached to a lower portion of a driver's seat in a room by fixing the bracket 3 with a fixing screw or the like.
A terminal of the accelerator opening sensor 20 is connected to a constant voltage power supply, and an output terminal thereof is connected to a control processing circuit of a throttle valve.
A throttle valve driving device is connected to an output side of the control processing circuit.

Next, the operation of the accelerator pedal device having the above structure will be described. When the accelerator pedal 1 is not operated, that is, when the accelerator pedal is fully closed, the pedal depression stroke of the accelerator pedal and its pedaling force (torque of the support shaft) are determined. Is located at point A in FIG.

When the driver depresses the accelerator pedal 1,
The pedal arm 2 is pivoted on the support shaft 4 to return springs 10 and 11.
Pivots against the biasing force of. At this time, the tip of the pedal arm 2 tilts in the direction opposite to the direction in which the pedal is depressed, that is, in the forward direction of FIG. The rotor 21 of the accelerator opening sensor 20 forming the axis rotates clockwise in FIG.

When the accelerator pedal 1 is depressed, the support shaft 4 rotates clockwise in FIG. 2, but at this time, the shaft cylinder 5 does not rotate, and the two return springs 10 and 11 are screwed in the same direction. Therefore, the pressing member 6, which is inserted into the end on the shaft cylinder 5 and the end of the return spring is locked, receives the rotational force in the same direction by the torsional spring force of the return springs 10, 11. At this time, the rotating power is generated by the inclined convex portion 5b and the inclined convex portion 6b of the shaft cylinder 5 and the pressing member 6.
As shown in FIG. 8, the action of the inclined surfaces contacting each other generates a pressing force for pressing the pressing member 6 against the right side wall portion 3b, and at the same time, the reaction force causes the barrel 5 to press the left side wall portion 3a. Pressure develops. The left and right side walls 3a and 3b are pushed outward by the left and right pressing force, and the friction case 12,
It acts so as to press against the friction plates 7, 8 in 13.

Therefore, the rotational frictional resistance between the friction plate 7 and the left side wall 3a and the rotational frictional resistance between the friction plate 8 and the right side wall 3b gradually increase according to the rotational width of the support shaft 4. Thus, the depression force gradually and appropriately increases according to the amount of depression of the accelerator pedal 1. Therefore, when the accelerator pedal is operated, a tactile operation feeling can be obtained, and the accelerator operation can be performed in a stable state, and the same operability as that of the conventional accelerator pedal with a cable can be obtained without discomfort. Can be. During this time,
According to the depression amount of the accelerator pedal 1, the rotor 21 of the accelerator opening sensor 20 rotates through a crank mechanism,
From this, a signal indicating the accelerator opening is output.

On the other hand, when the foot is released from the accelerator pedal 1,
In order to reduce the pedaling force, the point shifts from point B to point C in FIG.
, And the accelerator pedal returns to the non-depressed state from the point C to the point D. Even at the time of this counter-stepping rotation, the rotational friction resistance between the friction plate 7 and the left side wall 3a and the rotational friction resistance between the friction plate 8 and the right side wall 3b gradually increase according to the rotation width of the support shaft 4. Due to the decrease, the accelerator pedal 1 operates to return gently, and stable accelerator operability can be obtained.

In the above embodiment, the friction member is
Although the washer-shaped friction plates 7 and 8 are housed in the friction cases 12 and 13, a friction member having an arbitrary shape can be held by another member. Further, although the friction plates 7 and 8 are provided on both sides, only one of them may be provided.

[Brief description of the drawings]

FIG. 1 is a front view of an accelerator pedal device showing one embodiment of the present invention.

FIG. 2 is a left side view of the accelerator pedal device.

FIG. 3 is an enlarged half sectional view near a support shaft.

FIG. 4 is a sectional view (a) and a front view (b) of a friction case.

FIG. 5 is a side view (a) and a front view (b) of a friction plate.

FIG. 6 is a left side view (a), a front view (b), and a right side view (c) of the barrel.

FIG. 7 is a side view (a) and a front view (b) of a pressing member.

FIG. 8 is a half cross-sectional view of the vicinity of a spindle during a stepping operation.

FIG. 9 is a graph showing a relationship between a pedal stroke and a pedaling force.

[Explanation of symbols]

 1-Accelerator pedal 2-Pedal arm 3-Bracket 4-Support shaft 5-Axle tube 5b-Incline convex portion 6-Pressing member 6b-Incline convex portion 7,8-Friction plate 10,11-Return spring 12,13-Friction Case 20-Accelerator opening sensor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kunio Takagi, 1-1 1-1 Kyowa-cho, Obu City, Aichi Prefecture Inside Ai San Industry Co., Ltd. (72) Inventor Sumio Ito 52 No. 2 Ohashi Iron Works Co., Ltd.

Claims (4)

[Claims] 1. A pedal arm having a support shaft fixed to an intermediate portion and an accelerator pedal fixed to a distal end, a bracket for rotatably supporting the support shaft, and a pedal disposed around the support shaft, A return spring that urges the arm in the depressing direction, and an accelerator opening sensor that is mounted on the bracket and generates a signal indicating the accelerator opening in accordance with the rotation of the pedal arm. In the accelerator pedal device, when the accelerator pedal is depressed, the torsion spring force generated in the return spring is converted into a pressing force in the axial direction of the support shaft, and the stationary portion is pressed by the pressing force to generate frictional resistance. An accelerator pedal device, wherein a friction member to be rotated is provided to be rotatable together with the support shaft. 2. A shaft cylinder fitted to the outer peripheral portion of the support shaft and fixedly attached to the bracket, and fitted to an end of the shaft cylinder to lock an end of the return spring. And a friction member disposed so as to sandwich the other side wall of the bracket between the pressing member and the pressing member. The inclined convex portions are provided so as to be able to engage with each other, and when the accelerator pedal is depressed, the torsion spring force of the return spring is converted into an axial pressing force by the engagement of the inclined convex portions. 2. The accelerator pedal device according to claim 1, wherein a frictional resistance is generated by sandwiching a side wall of the bracket between the bracket and the friction member. 3. A shaft cylinder fitted to the outer periphery of the support shaft and fixedly attached to the bracket, and fitted to an end of the shaft cylinder, and an end of the return spring is locked. A first friction member disposed so as to sandwich the side wall portion of the bracket between the pressing member and the distal end portion of the barrel, and the other side wall portion of the bracket between the first friction member and the pressing member. A second friction member disposed so as to sandwich the accelerator pedal, and an inclined convex portion is provided so as to be mutually engageable at opposite ends of the shaft cylinder and the pressing member, and the accelerator pedal is provided. At the time of depressing, the torsion spring force of the return spring is converted into an axial pressing force by the engagement of the inclined convex portion, and the pressing force is applied to both sides of the bracket between the first and second friction members. 2. The accelerator pedal according to claim 1, wherein a frictional resistance is generated by sandwiching the side wall. apparatus. 4. The accelerator pedal device according to claim 2, wherein the friction member is formed of a friction plate disposed in a friction case.