WO2003068549A1

WO2003068549A1 - Accelerator pedal module

Info

Publication number: WO2003068549A1
Application number: PCT/JP2003/000639
Authority: WO
Inventors: Mitsuru Sekiya
Original assignee: Mikuni Corporation
Priority date: 2002-02-13
Filing date: 2003-01-24
Publication date: 2003-08-21
Also published as: JP2003237405A

Abstract

An accelerator pedal module, comprising a body (2), a lever (3), a movable frictional member (4), a fist return spring (5), and a second return spring (6) to reduce the number of parts, wherein a rotating shaft (7) is installed in the body (2), an acting part (15) is provided on the movable frictional member (4), and frictional surfaces (16, 9) are provided on the movable friction member (4) and the body (2) to simplify a structure, whereby reducing a cost, and the setting of a depressing force can be easily changed by altering the amount of offset between the frictional surfaces (9, 16), i.e., an angle (θ) formed by a line (L) connecting the axis (O) of the rotating shaft (7) to the acting point (Z) of the acting part (15) and the acting direction of a pressing load (b) acting on the movable frictional material (4) by the depressing force, whereby a production cost can be reduced, and the setting of the depressing force can be easily altered.

Description

Technical field

The present invention relates to an accelerator pedal module used for a vehicle such as an automobile or a motorcycle, and particularly to an accelerator pedal module used for a vehicle employing an electronically controlled throttle system (drive-by-wire system).

Background art

An example of this kind of accelerator pedal module is described in International Publication Pamphlet (WO 01/19638) filed by the applicant earlier.

The above-mentioned accelerator module can be moved from a rest position (a position corresponding to the fully closed state of the throttle valve) to a maximum depressed position (a position corresponding to the fully opened state of the throttle valve) by a stepping load from the actuator. A lever, a rotating shaft rotatably supporting the lever, a return spring for returning the lever to the rest position, a frictional force generated by the rotation of the lever, and according to a rotation amount of the lever. And a frictional force changing mechanism.

The axel pedal module changes the frictional force according to the amount of rotation of the lever, as shown in FIG. It is obtained as That is, in the outgoing path (P 1 to P 2) toward the maximum depressed position and the return path (P 3 to P 4) returning to the rest position, On the side, the hysteresis is small (narrow width), and on the side of the maximum depression position, the hysteresis is large (wide).

As a result, the accelerator pedal module has the same tread load characteristics as the conventional accelerator pedal device with a wire. As a result, the accelerator pedal module has a favorable operation feeling, response characteristics, vehicle controllability, and the like.

The present invention relates to an improvement of the accelerator pedal module. An object of the present invention is to provide an accelerator pedal module which has a small number of parts, has a simple structure, and as a result, has a low manufacturing cost and can easily change the setting of the stepping load. . Disclosure of the invention

In order to achieve the above object, the invention according to claim 1 includes a body attached to a vehicle body, a lever rotatably supported on the body via a rotation shaft, and an accelerator pedal attached to the body. A return spring for returning the lever and the movable friction member to a rest position, wherein an operating portion on which a step load from the accelerator pedal acts on the movable friction member via the lever. The movable friction member and the body are provided with a friction surface on which a frictional force is generated by the stepping load and the return spring load, respectively, and the friction surface is provided on an axis of the rotating shaft. And is disposed at a position offset with respect to a line connecting the action point of the action part.

Further, the invention according to claim 2 is characterized in that the action portion is formed by an arc-shaped protrusion or recess, and the contact portion that contacts the action portion of the lever is formed by an arc-shaped recess or protrusion. And Further, in the invention according to claim 3, the body, the lever, and the movable friction member are respectively formed of different members, and an action portion and a friction surface of the movable friction member are in contact with a contact portion of the lever and a friction surface of the body. It is free.

The invention according to claim 4 is characterized in that the return spring comprises a return spring for a lever and a return spring for a movable friction member.

The invention according to claim 5 is characterized in that a play clearance is provided between the lever at the rest position and the movable friction member. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a longitudinal sectional view showing an accelerator pedal module according to Embodiment 1 of the present invention.

FIG. 2 is an exploded vertical sectional view showing components of the accelerator pedal module according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram showing a structure of the accelerator pedal module according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a state when the accelerator pedal module according to the first embodiment of the present invention is depressed.

FIG. 5 is an explanatory diagram showing a state when the accelerator pedal module according to the first embodiment of the present invention returns.

FIG. 6 is an explanatory diagram showing a step load characteristic of the accelerator pedal module according to the first embodiment of the present invention.

FIG. 7 is a partial longitudinal sectional view showing an accelerator pedal module according to Embodiment 2 of the present invention.

FIG. 8 is an accelerator pedal module according to Embodiment 2 of the present invention. FIG. 4 is an explanatory diagram showing a stepping load characteristic of a vehicle.

FIG. 9 is a partial longitudinal sectional view showing an accelerator pedal module according to a modification of the second embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a step load characteristic of an accelerator pedal module according to a modification of the second embodiment of the present invention.

FIG. 11 is an explanatory diagram showing a stepping load characteristic by a conventional accelerator pedal module. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, two examples of an embodiment of an accelerator pedal module according to the present invention will be described with reference to FIG. 1 to FIG. The present invention is not limited by the embodiment.

(Embodiment 1)

1 to 6 show a first embodiment of an accelerator pedal module according to the present invention. The accelerator pedal module 1 according to the first embodiment includes a body 2 as a separate member, a lever 3, a movable friction member 4, a first return spring 5, and a second return spring 6. .

The body 2 is attached to a vehicle body (not shown), and is made of, for example, a resin containing glass fiber (PET). At substantially the center of the body 2, a rotating shaft 7 and an arc-shaped fixed friction member 8 are provided integrally and concentrically. On the outer surface of the fixed friction member 8, a convex friction surface 9 which is concentric with the rotating shaft 7 is provided. The friction surface 9 is arranged near the outside of the rotation shaft 7. Further, a shallow concave portion 10 is provided at one end of the body 2. At one end of the lever 3, a cylindrical through-hole 11 and an arc-shaped groove 12 are provided concentrically, respectively. Further, a contact portion 13 made of a quarter-arc-shaped concave portion is provided at the base of the top plate and the side plate at the center of the lever 3. Further, an accelerator pedal 14 is attached to the other end of the lever 3.

By fitting the rotating shaft 7 of the body 2 and the through hole 11 of the lever 3, the lever 3 is rotatably supported by the body 2 via the rotating shaft 7. Become. The fixed friction member 8 of the body 2 is disposed in the groove 12 of the lever 3 so as not to hinder the rotation of the lever 3.

The movable friction member 4 is made of, for example, a resin (nylon) containing glass fiber. One end of the movable friction member 4 is provided with an action portion 15 to which a step load from the accelerator pedal 14 acts via the lever 3. The action portion 15 is formed of a columnar, that is, an arc-shaped convex portion. The other end of the movable friction member 4 is provided with a concave friction surface 16 which is concentric with the friction surface 9 of the body 2. In the center of the movable friction member 4, a concave portion 17 is provided. Between the concave portion 17 of the movable friction member 4 and the receiving member 18 set in the concave portion 10 of the body 2, the first return spring 5 and the second return spring 6 are interposed in a compressed state, respectively. Have been. The first return spring 5 and the second return spring 6 return the lever 3 and the movable friction member 4 to a rest position (for example, a state shown in FIG. 1). In this example, the first return spring 5 and the second return spring 6 are composed of two inner and outer springs, but may be one return spring or three or more return springs. Due to the spring force of the first return spring 5 and the second return spring 6, the working portion 15 and the friction surface 16 of the movable friction member 4 are brought into contact with the contact portion 13 of the lever 3 and the frictional surface 16. The friction surface 9 of the body 2 is supported by being abutted and fitted in a free state. As a result, the action portion 15 and the friction surface 16 of the movable friction member 4 are free with respect to the contact portion 13 of the lever 3 and the friction surface 9 of the body 2. Regardless, the movable friction member 4 is supported by the body 2 and the lever 3 such that there is no movement other than a predetermined movement during operation.

The friction surface 16 of the movable friction member 4 and the friction surface 9 of the body 2 generate frictional force due to the stepping load and the load of the first return spring 5 and the second return spring 6. The friction surfaces 9 and 16 are arranged at positions offset with respect to a line L connecting the axis O of the rotation shaft 7 and the operation point Z of the operation section 15. That is, as shown in FIG. 3, a line L connecting the axis O of the rotating shaft 7 and the operating point Z of the operating portion 15 and a pushing load b acting on the movable friction member 4 by the stepping load B Has an angle の間に with the direction of action of

In the part of the body 2 and the lever 3 opposite to the first return spring 5 and the second return spring 6 with respect to the rotation shaft 7, a stop 19 is provided, respectively. The stopper 19 is for positioning the lever 3 at a rest position.

The accelerator pedal module 1 according to the first embodiment is provided with a sensor (not shown) for detecting the rotational displacement of the lever 3. The sensor is connected to a vehicle-mounted computer (not shown), and an actuator for opening and closing a throttle valve (not shown) is connected to the computer. Then, the depression amount of the accelerator pedal 14 (4 Is detected as rotational displacement by the sensor via the lever 3 and is converted into an electric signal. This electrical signal is then output to a computer to open and close the throttle valve.

The accelerator pedal module 1 according to the first embodiment is configured as described above, and its operation will be described below.

First, with reference to FIG. 4, the operation at the time of stepping will be described. When the accelerator pedal 14 is depressed in the direction of the outlined arrow, the load B 1 acts on the lever 3. This step load B 1 acts as a pushing load b on the movable friction member 4 and acts as a load component b h on the friction surfaces 9 and 16 in the vertical direction of the friction surfaces 9 and 16.

At this time, the load A also acts on the movable friction member 4. This load A is a resultant force of the load of the first return spring 5 and the load of the second return spring 6. This spring load A acts as a pressing load a on the movable friction member 4 in the same manner as the step load B 1, and also acts on the friction surfaces 9, 16 in a direction perpendicular to the friction surfaces 9, 16. Acts as a load component ah.

Then, the friction surfaces 9 and 16 are operated by the generation of the frictional force F1 when depressed. The frictional force F1 at the time of stepping is obtained by the following equation (1). Where α is the dynamic friction coefficient.

Next, the operation at the time of return will be described with reference to FIG. When the accelerator pedal 14 is returned in the direction of the outlined arrow, a lever load B2 smaller than the pedal load B1 when the lever 3 is depressed is applied to the lever 3. At the time of this return, the step load B 2 does not act on the movable friction member 4. Therefore, the pushing load b does not act on the movable friction member 4, and the load component bh in the vertical direction of the friction surfaces 9, 16 does not act on the friction surfaces 9, 16. On the other hand, a load A, which is the resultant force of the first return spring 5 and the second return spring 6, is acting on the movable friction member 4. Therefore, as described above, the spring load A acts as the pushing load a on the movable friction member 4 as in the case of the stepping load B 1, and the frictional force exerts on the frictional surfaces 9 and 16. Acts as the vertical load component ah on surfaces 9 and 16. Then, a friction force F2 at the time of return is generated and acts on the friction surfaces 9 and 16. The frictional force F2 at the time of this return is obtained by the following expression (2), and is smaller than the frictional force F1 at the time of the depression of the above expression (1).

Then, the operation of the accelerator pedal module 1 according to the first embodiment will be described with reference to FIG. First, when the accelerator pedal 14 is not depressed, the accelerator pedal 14, the lever 3, and the movable friction member 4 are at the rest position.

When the accelerator pedal 14 located at the rest position starts to be depressed, as shown in the description of FIG. 4, the friction surfaces 9 and 16 generate a frictional force F1 when depressed and start to act. . At this time, the stepping load at the stepping start position P1 is the sum of the spring load A and the frictional force F1 at the time of stepping.

Subsequently, when the accelerator pedal 14 is further depressed, the depressed load increases linearly (linearly) and reaches a maximum value when it reaches the maximum depressed position P2. The increase in the step load (P 2 _P 1) during this step is larger than the increase in the spring load A (P 6-P 5).

Next, from the state where the accelerator pedal 14 is located at the maximum depression position P2, when the depression force of the accelerator pedal 14 is weakened and the accelerator pedal 14 starts to return, as shown in the description of FIG. The return frictional force F 2 is generated at 9, 16 and begins to act. At this time, the return start position P 3 Is the difference between the spring load A and the return friction force F2.

Subsequently, when the accelerator pedal 14 is further returned, the stepping load decreases linearly (linearly) and reaches a minimum value when the rest position P4 is reached. The amount of decrease in the stepping load (P3—P4) at this return is smaller than the amount of decrease in the spring load A (P6—P5).

Thus, in the accelerator pedal module 1 according to the first embodiment, as shown in FIG. 6, the characteristics of the stepping load of the accelerator pedal 14 can be obtained as hysteresis. In other words, the hysteresis is small (narrow) at the rest position on the outward path (P1 to P2) toward the maximum depressed position and the return path (P3 to P4) returning to the rest position. Hysteresis is large (wide) at the stepping position side.

As a result, the accelerator pedal module 1 according to the first embodiment has the same stepping load characteristics as the conventional accelerator pedal device with a wire. As a result, the accelerator pedal module can obtain favorable operation bouilling, response characteristics, vehicle controllability, and the like.

As a result, the accelerator pedal module 1 according to the first embodiment includes the body 2, the lever 3, the movable friction member 4, the first return spring 5, and the second return spring 6, The number of parts is small. Further, the accelerator pedal module 1 according to the first embodiment includes a rotating shaft 7 provided on the body 2, an action portion 15 provided on the movable friction member 4, and a friction surface 16 provided between the movable friction member 4 and the body 2. And 9 respectively, so the structure is simple. Thus, the manufacturing cost of the accelerator pedal module 1 according to the first embodiment is low. Further, the accelerator pedal module 1 according to the first embodiment has an offset amount of the friction surfaces 9 and 16, that is, the axis O of the rotating shaft 7 and the acting portion 1. The setting of the stepping load can be easily changed by changing the angle の between the line L connecting the action point Z of 5 and the direction of the pressing load b acting on the movable friction member 4 due to the stepping load.

Further, the accelerator pedal module 1 according to the first embodiment can be compactly assembled because the friction surface 9 is arranged near the outside of the rotation shaft 7. Further, the accelerator pedal module 1 according to the first embodiment generates the frictional forces F 1 and F 2 not by the rotating shaft 7 but by the friction surface 16 of the movable friction member 4 and the friction surface 9 of the body 2. Therefore, the degree of freedom in setting the step load is large. That is, the material of the friction surfaces 9 and 16 is changed, the positions of the friction surfaces 9 and 16 are changed, the friction surfaces 9 and 16 are subjected to a frictional force applying process such as blasting, and the friction surfaces 9 and 16 are changed. By fixing the frictional force imparting member as another member in Fig. 6, the setting of the stepping load can be greatly changed. Furthermore, since the accelerator pedal module 1 according to the first embodiment operates only the rotation function without generating a frictional force on the rotation shaft 7, the reliability of the rotation function of the rotation shaft 7 is improved.

Further, in the accelerator pedal module 1 according to the first embodiment, a step load is applied by fitting the acting portion 15 of the arc-shaped convex portion to the contact portion 13 of the arc-shaped concave portion. Since the action point Z is stabilized, stable stepping load characteristics can be obtained. Further, the accelerator pedal module 1 according to the first embodiment has an arcuate convex portion provided on the action portion 15 of the movable friction member 4, while an arcuate concave portion is provided on the contact portion 13 of the lever 3. The number of parts does not increase. Furthermore, since the actuator pedal module 1 according to the first embodiment fits the action portion 15 of the movable friction member 4 and the contact portion 13 of the lever 3, the assembly is simple.

In addition, the accelerator pedal module 1 according to the first embodiment has a body 2, a lever 3, and a movable friction member 4 which are separately formed from each other. And the action portion 15 and the friction surface 16 of the movable friction member 4 are free with respect to the contact portion 13 of the lever 3 and the friction surface 9 of the body 2, so that the movable friction member 4 is Difficult to stick to body 2. In particular, in the accelerator pedal module 1 according to the first embodiment, the body 2 and the movable friction member 4 constituting the friction surfaces 9 and 16 are made of an inexpensive material, that is, a resin (PET and nylon) containing glass fiber. Therefore, the manufacturing cost can be further reduced.

In the accelerator pedal module 1 according to the first embodiment, the friction surfaces 9 and 16 are provided outside the rotary shaft 7, so that the diameter of the friction surfaces 9 and 16 can be increased. As a result, the surface pressure is reduced, the wear of the friction surfaces 9 and 16 is prevented, and the durability of the friction surfaces 9 and 16 is improved.

(Embodiment 2)

7 and 8 show a second embodiment of the accelerator pedal module according to the present invention. In the drawings, the same reference numerals as those in FIGS. 1 to 6 denote the same components.

The accelerator pedal module 20 according to the second embodiment is provided with a through hole 21 (or a groove or a concave portion) in the center of the movable friction member 4, and a convex portion 22 in the lever 3. The through hole 21 and the projection 22 are movably fitted. The first return spring 5 is used as a return spring for the lever 3, while the second return spring 6 is used as a return spring for the movable friction member 4.

Since the accelerator pedal module 20 according to the second embodiment is configured as described above, even if the movable friction member 4 sticks to the body 2, the return spring for the lever 3 (first spring) The lever 3 can be returned to the rest position by the return spring 5). Therefore, the operation of the accelerator pedal 14 by the accelerator position sensor The fail-safe function at the time of detecting the state is secured.

In the accelerator pedal module 20 according to the second embodiment, only the load of the second return spring 6 acts on the movable friction member 4. Therefore, the frictional force F11 when the accelerator pedal module 20 according to the second embodiment is depressed and the frictional force F21 when the accelerator pedal module 20 returns (see FIG. 8) are different from those of the first embodiment. The frictional force F1 when the accelerator pedal module 1 is depressed and the frictional force F2 when the accelerator pedal module 1 returns (see FIG. 6) are reduced as a whole.

As a result, the depressing start position P11, the maximum depressing position P21, the return starting position P31, and the rest position P41 in Fig. 8 are the depressing start position P1, the maximum depressing position in Fig. 6. The position is closer to the load A, which is the resultant force of the first return spring 5 and the second return spring 6, compared to the position P2, the return start position P3, and the rest position P4.

(Modification of Embodiment 2)

9 and 10 show a modification of the accelerator pedal module according to the second embodiment of the present invention. In the drawings, the same reference numerals as those in FIGS. 1 to 8 denote the same components.

An accelerator pedal module 23 according to a modification of the second embodiment is provided with a stopper 24 between the body 2 and the movable friction member 4. Thereby, a play clearance 25 is provided between the lever 3 at the rest position and the movable friction member 4.

As a result, as shown in FIG. 10, the axial pedal module 23 according to the modification of the second embodiment can provide an arbitrary amount of play at the start of depression of the accelerator pedal 14. Becomes

That is, the contact portion 13 of the lever 3 and the action portion 15 of the movable friction member 4 come into contact with each other from the start of the depression of the accelerator pedal 14 (the depression start position P 7). Until the point of contact (contact position P 1 2), only the load of the first return spring 5 acts. At the time when the accelerator pedal 14 is depressed for play clearance 25 for 5 minutes and the contact portion 13 of the lever 3 contacts the action portion 15 of the movable friction member 4 (contact position P 1 2), The load of the first return spring 5 and the load of the second return spring 6 act respectively. Then, while the accelerator pedal 14 is further depressed to reach the maximum depressed position P21, the same depressing load as in Fig. 8 is applied. When the accelerator pedal 14 is returned and the movable friction member 4 hits the stop 24 from the return start position P31 (that is, the contact portion 13 of the lever 3 and the action portion 1 of the movable friction member 4). 5, that is, up to the stop position P 42), the load of the first return spring 5 and the load of the second return spring 6 act. For this reason, a stepping load similar to that shown in FIG. 8 is applied between the return start position P31 and the stopper position P42. Then, only the load of the first return spring 5 acts from the stop position P42 to the rest position, that is, the depression start position P7.

In the first embodiment, the lever 3 and the movable friction member 4 are configured as separate members. In the present invention, however, the lever 3 and the movable friction member 4 are integrally configured. Is also good. That is, the contact portion 13 of the lever 3 and the action portion 15 of the movable friction member 4 may be integrally connected. Further, in the first and second embodiments and the modified examples, the friction surfaces 9 and 16 form the circumferential surface. However, in the present invention, the shape of the friction surface is not particularly limited.

Further, in the first and second embodiments and the modified examples, the friction surfaces 9 and 16 are provided near the outer side of the rotary shaft 7, but in the present invention, the friction surfaces are provided at other positions. May be. Furthermore, in the first and second embodiments and the modifications, the contact portion 13 of the lever 3 forms an arc-shaped concave portion, and the operating portion 15 of the movable friction member 4 forms an arc-shaped convex portion. However, in the present invention, the shapes of the contact portion 13 and the acting portion 15 are not particularly limited.

Furthermore, in the first and second embodiments and the modified examples, the rotating shaft 7 is provided on the body 2 side. However, in the present invention, the rotating shaft 7 may be provided on the lever 3 side. Industrial applicability

ADVANTAGE OF THE INVENTION According to this invention, the number of parts is small, and a structure is simple, As a result, the manufacturing cost is inexpensive, and the effect that an axel pedal module which can change the setting of a step load easily is obtained. Play.

Claims

The scope of the claims

1. A body attached to the car body,

A lever rotatably supported on the body via a rotation shaft, and an accelerator pedal being attached;

A movable friction member,

A return spring that returns the lever and the movable friction member to a rest position;

With

The movable friction member is provided with an action portion on which a step load from the accelerator pedal acts via the lever,

The movable friction member and the body are provided with friction surfaces on which frictional force is generated by the stepping load and the return spring load, respectively.

The friction surface is disposed at a position offset with respect to a line connecting an axis of the rotation shaft and an operation point of the operation section.

An accelerator pedal module, characterized in that:

2. The operating portion is formed of an arc-shaped convex portion or a concave portion, and the contact portion of the lever that comes into contact with the operating portion is formed of an arc-shaped concave portion or a convex portion into which the operating portion is fitted. 2. The method according to claim 1, wherein:

3. The body, the lever, and the movable friction member are separate members, and the operating portion and the friction surface of the movable friction member are the contact portion of the lever and the friction surface of the body. 3. The module according to claim 1, wherein the module is free of any of the following.

4. The accelerator pedal module according to claim 3, wherein the return spring comprises a return spring for the lever and a return spring for the movable friction member.

5. The pedal module according to claim 4, wherein a play clearance is provided between the lever at the rest position and the movable friction member.