JP2023115803A - Accelerator pedal malfunction preventing device, and accelerator pedal unit - Google Patents

Abstract

To provide an accelerator pedal malfunction preventing device in which a sudden stepping-down operation of the accelerator pedal is prevented and the operation feeling conforming to a driver is achieved.SOLUTION: A pedal malfunction preventing device 7 comprises: a piston 21 which has a division wall 30 dividing the inside of a cylinder 20 into a first chamber 31 and a second chamber 32, and a main continuous hole 33 and a sub continuous hole 34 arranged at the division wall 30 to communicate the first chamber 31 with the second chamber 32; a normally open valve body 22 which is arranged in the second chamber 32 and can block the main continuous hole 33 by a pressure rise of hydraulic fluid on the second chamber 32 side; and a pushrod 23 which has a second end side connected to the piston 21 and can transfer a tread force to a first end side protruding to outside of the cylinder 20. The main continuous hole 33 and the sub continuous hole 34 are formed in a manner to have an aperture area on the second chamber 32 side larger than an aperture area on the first chamber 31.SELECTED DRAWING: Figure 4

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accelerator pedal erroneous depression prevention device and an accelerator pedal unit for preventing a vehicle from suddenly starting due to an abrupt depression of the accelerator pedal.

Conventionally, in a vehicle such as an automatic vehicle, there has been proposed an erroneous depression prevention device for suppressing the sudden start of the vehicle when the driver erroneously performs a sudden depression operation during temporary stop or start of the vehicle. .

For example, Patent Literature 1 discloses a vehicle emergency stop system having a hydraulic control device connected to the underside of an accelerator pedal. The hydraulic control device of this vehicle emergency stop system includes a piston that moves within a cylinder, a valve plate that can open and close an orifice provided in the piston, a spring that biases the valve plate away from the orifice, have

The piston of the hydraulic control device moves in the cylinder with the valve plate opening the orifice by the biasing force of the spring when the accelerator pedal is stepped on with the pressure force of the normal speed mode. As a result, the pressure oil in the cylinder properly moves the piston, and proper speed control is obtained by operating the accelerator lever.

On the other hand, the piston of the hydraulic control device moves in the cylinder with the valve plate closing the orifice against the biasing force of the spring when the accelerator pedal is stepped on with an abnormally rapid pressurizing force. . As a result, the pressurized oil in the cylinder provides resistance to the movement of the piston, preventing the accelerator lever from being depressed. In addition, hydraulic pressure generated by the hydraulic control system pressurizes the brake pedal and automatically stops the engine drive mechanism.

JP 2003-146106 A

However, the technique disclosed in Patent Document 1 described above employs a configuration in which the valve plate closes all the orifices when the accelerator pedal is rapidly depressed. Therefore, with the technique disclosed in Patent Document 1, there is a risk that the valve plate will stick to the piston due to the hydraulic pressure difference that occurs on both sides of the piston in the cylinder. While the valve plate is maintained in such a fixed state, there is a risk that the driver's proper operation of the accelerator may be hindered.

In vehicles equipped with electronically controlled throttle valves, etc., hysteresis is added to the characteristics of the pedal force and stroke when the accelerator pedal is depressed and released in order to achieve accelerator operation that matches the driver's feeling. is desirable. However, the technique disclosed in Patent Document 1 mentioned above does not consider the hysteresis characteristics when the accelerator pedal is depressed and when it is released.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an accelerator pedal erroneous depression prevention device and an accelerator pedal unit that can prevent abrupt depression of an accelerator pedal and realize an operation feeling that matches the driver's feeling. .

An accelerator pedal erroneous depression prevention device according to one aspect of the present invention includes a cylinder filled with a fluid, and a first chamber having a variable volume and a first chamber having a variable volume and a second end portion inside the cylinder. a piston having a partition wall that partitions the first chamber and the second chamber, the partition wall being provided with a main communication hole and a secondary communication hole that communicate with the first chamber and the second chamber; A normally open valve body capable of closing the main communication hole by pressure rise of the fluid on the second chamber side; a push rod capable of transmitting a pedaling force to the protruding first end side, wherein the opening area of at least one of the main through hole and the sub through hole on the second chamber side is the first It is set larger than the opening area on the room side.

An accelerator pedal unit according to one aspect of the present invention comprises a cylinder filled with a fluid, and a first end side and a second end side inside the cylinder divided into a first chamber and a second chamber having variable volumes. a piston having a partition wall for partitioning the partition wall and provided with a main communication hole and a secondary communication hole for communicating the first chamber and the second chamber; a normally open valve body capable of closing the main communication hole by pressure rise of the fluid; and a rod, wherein the opening area of at least one of the main communication hole and the sub communication hole on the second chamber side is set larger than the opening area on the first chamber side. A prevention device and an accelerator pedal capable of transmitting a pedaling force to the push rod are provided.

According to the present invention, it is possible to prevent abrupt depression of the accelerator pedal and realize an operation feeling that matches the driver's feeling.

Side view of accelerator pedal unit Cross-sectional view of essential parts of the accelerator pedal unit when the accelerator pedal is released Cross-sectional view of essential parts of the accelerator pedal unit when the accelerator pedal is depressed Cross-sectional view of the main part of the erroneous stepping prevention device Exploded perspective view of erroneous stepping prevention device Explanatory diagram showing the behavior of the fluid in the erroneous depression prevention device when the accelerator pedal is depressed with a normal depression force. Explanatory diagram showing the behavior of the fluid in the erroneous depression prevention device when the accelerator pedal is depressed with a strong depression force. Explanatory diagram showing the behavior of the fluid in the erroneous depression prevention device when the accelerator pedal is released Characteristic diagram showing the relationship between the force applied to the accelerator pedal and the pedal stroke FIG. 11 is a cross-sectional view of a main part of an accelerator pedal unit according to a first modified example; Sectional view of essential parts of an accelerator pedal unit according to a second modification

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings relate to one embodiment of the present invention, and FIG. 1 is a side view of an accelerator pedal unit.

The accelerator pedal unit 1 shown in FIG. 1 is applied to, for example, a vehicle equipped with an electronically controlled throttle type engine, or a hybrid vehicle or an electric vehicle equipped with a driving motor (neither is shown).

The accelerator pedal unit 1 includes a housing 5, an accelerator lever 6 supported by the housing 5, and an erroneous depression prevention device 7 connected to a second end side of the accelerator lever 6. ,

The housing 5 has a flat, substantially box-like shape. An accelerator opening sensor 10 is provided on the side surface of the housing 5 . The accelerator opening sensor 10 is connected to, for example, an engine control unit (not shown).

Further, inside the housing 5, a rotating shaft 11 for supporting the accelerator lever 6 is provided at a position corresponding to the accelerator opening sensor 10 (see FIGS. 2 and 3). Furthermore, an opening 12 that communicates the inside and outside of the housing 5 is provided in a part of the bottom surface of the housing 5 .

The accelerator lever 6 is made of, for example, a metal member that is bent in a predetermined manner. A rotary bearing 15 is provided in the middle of the accelerator lever 6 . The rotary shaft 11 of the housing 5 is inserted through the rotary bearing 15 . As a result, the accelerator lever 6 is swingably supported with respect to the housing 5 .

One end side (first end side) of the accelerator lever 6 extends outside the housing 5 through the opening 12 . An accelerator pedal 16 is fixed to the first end of the accelerator lever 5 . The accelerator pedal 16 can transmit the pedaling force to the accelerator pedal unit 1 by being depressed by the driver.

Further, inside the housing 5 , a pedaling force transmission surface 17 is provided on the second end side (the other end side) of the accelerator lever 6 . The pedaling force transmission surface 17 transmits the pedaling force from the accelerator lever 6 to the erroneous depression prevention device 7 and also transmits the urging force from the erroneous depression prevention device 7 . The pedaling force transmission surface 17 is configured by, for example, a flat surface.

As shown in FIGS. 4 and 5, the erroneous depression prevention device 7 includes a cylinder 20, a piston 21 provided inside the cylinder 20, a push rod 23 connected to the piston 21, and a piston return spring 24. configured with.

The cylinder 20 is fixed to the housing 5 at a position facing the pedaling force transmission surface 17 of the accelerator lever 6 . The cylinder body 25 and the lid 26 are provided.

The cylinder main body 25 is made of, for example, a substantially cylindrical metal member. The cylinder body 25 is open at one end (first end) in the direction of the central axis O and closed at the other end (second end) in the direction of the central axis O. A male threaded portion 25a is formed on the outer periphery of the cylinder body 25 on the first end side.

The lid body 26 is made of, for example, a substantially disk-shaped metal member. A female screw portion 26a protrudes from the edge portion of the surface (the other end surface) of the lid 26 on the second end portion side. The female threaded portion 26 a can be screwed into the male threaded portion 25 a of the cylinder body 25 . As a result, the lid 26 closes one end of the cylinder main body 25 and encloses the working oil, which is a fluid, inside the cylinder 20 .

A through hole 26b for inserting the push rod 23 in the plate thickness direction is provided in the center of the lid 26. As shown in FIG. An annular sealing member 27 is held on the inner periphery of the through hole 26b. The seal member 27 liquid-tightly seals between the through-hole 26b and the push rod 23 .

The piston 21 has a metal partition 30, for example. The partition wall 30 is, for example, formed in a substantially disk shape that is slidable on the inner peripheral surface of the cylinder body 25 . Thereby, the partition wall 30 divides the one end side and the other end side of the inside of the cylinder 20 in the direction of the central axis O into the first chamber 31 and the second chamber 32 . The volume of each of the first chamber 31 and the second chamber 32 is variable by sliding the partition wall 30 of the piston 21 inside the cylinder 20 in the central axis O direction.

Further, for example, a main communication hole 33 that communicates between the first chamber 31 side and the second chamber 32 side is provided in the central portion of the partition wall 30 of the piston 21 . The main communication hole 33 has a first tapered surface 33a tapered to reduce the opening area from the second chamber 32 side toward the first chamber 31 side. As a result, the flow rate of the fluid passing through the main communication hole 33 when the piston 21 moves from the second chamber 32 side to the first chamber 31 side is It is relatively suppressed compared to the flow rate of the fluid passing through the main communication hole 33 when it is connected.

Further, for example, in the partition wall 30 of the piston 21 , a plurality of sub-communication holes 34 are provided around the main communication hole 33 . The total effective opening area of each secondary communication hole 34 is set relatively smaller than the effective opening area of the main communication hole 33 . Each sub-communication hole 34 has a second tapered surface 34a tapered to reduce the opening area from the second chamber 32 side toward the first chamber 31 side. As a result, the flow rate of the fluid passing through the auxiliary communication hole 34 when the piston 21 moves from the second chamber 32 side to the first chamber 31 side is It is relatively suppressed compared to the flow rate of the fluid passing through the sub-communication hole 34 when it is connected.

Due to the action of these first and second tapered surfaces 33a and 34a, the movement resistance of the hydraulic oil when the piston 21 moves from the second chamber 32 side to the first chamber 31 side is It is relatively larger than the movement resistance due to hydraulic oil when moving from the side to the second chamber 32 side.

The opening area of the main communication hole 33, the opening area of the auxiliary communication hole 34, and the taper angles of the first and second tapered surfaces 33a and 34a are determined based on the movement resistance required of the piston 21, etc. It is appropriately set by simulation or the like.

Further, on the wall surface of the partition wall 30 of the piston 21 on the second chamber 32 side, a plurality (for example, four) of first spring receiving pins 30a are provided. These first spring receiving pins 30a are arranged, for example, at positions surrounding the main communication hole 33 and closer to the central axis O than each sub communication hole 34 at equal intervals.

The valve body 22 has, for example, a valve body 36 capable of opening and closing only the main communication hole 33 and an outward flange 37 provided on the second end side of the valve body 36 . The valve body 36 and outward flange 37 are integrally formed of the same metal as the partition wall 30 of the piston 21, for example.

The valve body 36 is composed of a substantially cylindrical member that can be inserted into the main communication hole 33 . A tapered surface 36a is formed on the outer peripheral surface of the valve main body 36 on the first end side so that the tapered surface 36a decreases in diameter from the second end side toward the first end side. The taper angle of the tapered surface 36 a is set smaller than the taper angle of the first tapered surface 33 a formed in the main communication hole 33 .

The outward flange 37 is composed of a substantially disk-shaped member protruding radially outward from the second end of the valve body 36 . Second spring receiving pins 37 a are provided on the outward flange 37 at positions corresponding to the first spring receiving pins 30 a provided on the partition wall 30 .

Each second spring receiving pin 37a is connected to each first spring receiving pin 30a via a valve body return spring 38, respectively. Thereby, the valve body 22 is elastically connected to the piston 21 .

The valve body 22 is normally opened with respect to the main communication hole 33 by the biasing force of the valve body return spring 38 . Then, when a predetermined pressing force is applied from the second end side to the first end side, the valve body 22 moves toward the first end side against the biasing force of the valve body return spring 38, thereby allowing the main communication. The hole 33 is closed.

It should be noted that the pressing force on the valve body 22 is mainly the hydraulic oil that is rapidly compressed in the second chamber 32 when the piston 21 moves in the cylinder 20 from the first end to the second end at a rapid speed. is given by the repulsive force of

On the other hand, when the pressing force from the second end side to the first end side is released, the valve body 22 is moved toward the second end side by the biasing force of the valve body return spring 38, and the main communication hole 33 is opened. Open.

The push rod 23 is composed of a substantially cylindrical member whose second end side is connected to the partition wall 30 of the piston 21 . A hole 40 communicating with the main communication hole 33 is provided along the central axis O on the second end side of the push rod 23 . Furthermore, the push rod 23 is provided with an opening 40 a that opens the hole 40 to the side of the push rod 23 . Even when the push rod 23 is connected to the partition wall 30 through the hole 40 and the opening 40a, the first chamber 31 and the second chamber 32 communicate with each other through the main communication hole 33 when the valve body 22 is opened. state is maintained.

On the other hand, an abutment member 41 is fixed to the first end of the push rod 23 so as to abut on the pedal effort transmission surface 17 of the accelerator lever 6 .

The piston return spring 24 is arranged inside the second chamber 32 . The piston return spring 24 urges the piston 21 toward the first end of the cylinder 20 with a predetermined urging force.

Next, the operation of the erroneous depression prevention device 7 configured in this manner will be described.

First, the operation when the driver depresses the accelerator pedal 16 at a relatively slow speed (less than the specified speed) will be described.

In this case, for example, as shown in FIG. It moves from the part side to the second end part side.

During this movement of the piston 21 , hydraulic fluid in the second chamber 32 flows into the first chamber 31 via the main communication hole 33 and the sub-communication hole 34 . This flow of hydraulic fluid allows the piston 21 to move from the first end side to the second end side within the cylinder 20 without excessively increasing the internal pressure of the second chamber 32 . Become.

That is, the piston 21 moves inside the cylinder 20 from the first end side to the second end side while receiving a weak reaction force from the hydraulic oil in the first chamber 32 .

As a result, for example, as shown in FIG. 9, the pedal stroke of the accelerator pedal 16 increases substantially linearly with a predetermined inclination a as the pedaling force F increases.

Next, the operation when the driver depresses the accelerator pedal 16 at a rapid speed (a speed higher than the prescribed speed) will be described. Note that the term "velocity above the specified speed" as used herein means, for example, the flow rate of hydraulic oil from the second chamber 32 side to the first chamber 31 side that is allowed by the main communication hole 33 and the sub-communication hole 34 within a unit time. This is the speed at which the amount of change (decrease) in the volume of the second chamber 32 due to the movement of the piston 21 (partition wall 30) within a unit time becomes sufficiently large.

In this case, for example, as shown in FIG. 7, the pedaling force F transmitted to the piston 21 via the push rod 23 causes the piston 21 to move toward the first end of the cylinder 20 against the biasing force of the piston return spring 24. It moves from the part side to the second end part side.

During this movement of the piston 21, the pressure of the working oil in the second chamber 32 rises sharply. Then, the repulsive force of the hydraulic oil whose pressure has suddenly increased acts as a pressing force that presses the valve body 22 from the second end side of the cylinder 20 toward the first end side.

This pressing force causes the valve body 22 to move from the second end side to the first end side against the biasing force of the valve body return spring 38 , and the valve body 36 closes the main communication hole 33 .

As a result, hydraulic fluid in the second chamber 32 moves to the first chamber 31 side only via the auxiliary communication hole 34 . Therefore, the state in which the pressure of the hydraulic fluid in the second chamber 32 is increased is maintained for a predetermined period.

As a result, the movement of the piston 21 toward the second end is suppressed by the repulsive force of the hydraulic oil whose pressure has increased. That is, for example, as shown in FIG. 9, the pedal stroke increases substantially linearly with an inclination c that is sufficiently larger than the inclination a with respect to an increase in the pedaling force F. Therefore, the erroneous depression prevention device 7 can prevent the vehicle from suddenly starting in response to the erroneous depression of the accelerator pedal 16 by the driver, while allowing the driver to recognize that the accelerator pedal 16 has been erroneously depressed.

Here, while the pressure of the hydraulic fluid in the second chamber 32 is relatively higher than the pressure of the hydraulic fluid in the first chamber 31 even after the rapid depressing action on the accelerator pedal 16 is inhibited, Hydraulic oil in the second chamber 32 moves to the first chamber 31 side through the auxiliary communication hole 34 . As a result, the pressure of the hydraulic fluid in the first chamber 31 and the second chamber 32 is smoothed. By smoothing the pressure in the first and second chambers 31 and 32, the valve body 22 is prevented from sticking to the main communication hole 33, and the valve body 22 is moved to the valve open position by the biasing force of the valve body return spring 38. move up to

Next, the action when the driver releases the accelerator pedal 16 will be described.

In this case, for example, as shown in FIG. 8, when the pedaling force starts to be released, the piston 21 starts moving from the second end side to the first end side due to the biasing force of the piston return spring 24. .

During this movement of the piston 21 , hydraulic fluid in the first chamber 31 flows into the second chamber 32 via the main communication hole 33 and the sub-communication hole 34 .

As a result, for example, as shown in FIG. 9, the pedal stroke decreases substantially linearly with a predetermined slope b as the pedaling force F decreases.

However, due to the action of the first tapered surface 33a and the second tapered surface 34a provided in the main communication hole 33 and the sub communication hole 34, the flow rate of the hydraulic oil when moving from the first chamber 31 side to the second chamber 32 side is suppressed more than the flow rate of hydraulic oil when moving from the second chamber 32 side to the first chamber 31 side.

Therefore, the resistance of the hydraulic oil acting on the piston 21 is greater when the piston 21 moves from the second end side to the first end side than when the piston 21 moves from the first end side to the second end side. It becomes relatively larger when

Therefore, the gradient b of the pedal stroke with respect to the depression force F when the accelerator pedal 16 is released is relatively smaller than the gradient a of the pedal stroke with respect to the depression force F when the accelerator pedal 16 is depressed. That is, the relationship between the pedaling force F and the pedal stroke when the accelerator pedal 16 is depressed and when the accelerator pedal is released has hysteresis characteristics.

According to this embodiment, the erroneous depression prevention device 7 partitions the first end side and the second end side inside the cylinder 20 into the first chamber 31 and the second chamber 32 having variable volumes. a piston 21 having a partition wall 30 that connects the first chamber 31 and the second chamber 32, and a main communication hole 33 and a secondary communication hole 34 that communicate with the first chamber 31 and the second chamber 32; A normally open valve body 22 capable of closing the main communication hole 33 by pressure increase of the fluid (operating oil) in the second chamber 32 side, and a piston 21 connected to the second end side thereof, and penetrating the cylinder 20 to and a push rod 23 capable of transmitting a pedaling force to a first end protruding to the outside of the main communication hole 33 and the sub-communication hole 34, and the opening area of the second chamber 32 side is the first chamber 31 side. The first tapered surface 33a and the second tapered surface 34a are formed so as to be set larger than the opening area of . As a result, it is possible to prevent abrupt depression of the accelerator pedal 16 and realize an operation feeling that matches the feeling of the driver.

That is, when a sudden pedaling force F is transmitted to the piston 21 due to an erroneous depression of the accelerator pedal 16, the valve body 22 closes the main communication hole 33 due to a sudden increase in pressure of the hydraulic oil on the side of the second chamber 32. do. As a result, the flow rate of hydraulic fluid moving from the second chamber 32 side to the first chamber 31 side is greatly reduced, and the high pressure of the hydraulic fluid on the second chamber 32 side is maintained for a predetermined period of time. Therefore, even when the accelerator pedal 16 is erroneously depressed, it is possible to accurately prevent the vehicle from suddenly starting.

In addition, even while the main communication hole 33 is closed, the hydraulic oil on the second chamber 32 side, whose pressure has suddenly increased due to the erroneous stepping, flows from the second chamber 32 side to the first chamber 31 side through the auxiliary communication hole 34. gradually move to As a result, the pressure of the hydraulic fluid in the first chamber 31 and the second chamber 32 can be smoothed, and the sticking of the valve body 22 to the main communication hole 33 can be reliably prevented.

In this case, since the total effective opening area of the sub-communication holes 34 is set sufficiently smaller than the effective opening area of the main communication holes 33, the valve body 22 causes the valve body 22 to close the main communication holes 33. The pressure of hydraulic fluid in the second chamber 32 can be maintained for a predetermined period. Furthermore, since the taper angle of the tapered surface 36a of the valve body 36 is set smaller than the taper angle of the first tapered surface 33a of the main communication hole 33, when the pressure of the hydraulic oil in the second chamber 32 decreases, , the valve body 22 can be accurately removed from the main communication hole 33 .

Further, the first tapered surface 33a and the second tapered surface 34a are formed in the main communication hole 33 and the sub communication hole 34 so that the opening area on the second chamber 32 side is set larger than the opening area on the first chamber 31 side. By forming it, the movement resistance that the piston 21 receives from the hydraulic oil when the driver steps on the accelerator pedal 16 and when the driver releases the accelerator pedal 16 can be made different, and an operational feeling that matches the feeling of the driver can be realized.

The invention described in the above embodiments is not limited to those forms, and various modifications can be made at the stage of implementation without departing from the scope of the invention. Furthermore, the above forms include inventions at various stages, and various inventions can be extracted by appropriate combinations of the disclosed constituent elements.

For example, in the above-described embodiment, the configuration in which the main communication hole 33 and the sub-communication hole 34 are provided with the first tapered surface 33a and the second tapered surface 34a has been described. Depending on the circumstances, it is possible to omit the tapered surface of either the main communication hole 33 or the sub-communication hole 34 and form a cylindrical surface.

In the above-described embodiment, the piston return spring 24 provided inside the cylinder 20 realizes the function of the return spring for urging the accelerator pedal 16 to the original rest position. The function of the spring can be realized by various other configurations. For example, as shown in FIG. 10, a return spring 24a that directly acts on the accelerator lever 6 can be arranged inside the housing 5. As shown in FIG. Alternatively, for example, as shown in FIG. 11, it is possible to dispose a return spring 24b that acts around the rotation shaft 11 of the accelerator lever 6 inside the housing 5 .

10 and 11, a mechanism for transmitting the urging force in the return direction of the return springs 24a and 24b to the piston 21 is required. Such a mechanism can be realized, for example, by providing the pedaling force transmission surface 17 in a slit-shaped key groove and using a key that engages with this key groove as the contact member 41 .

In addition, even if some constituent elements are deleted from all the constituent elements shown in the above forms, if the stated problem can be solved and the stated effect can be obtained, this constituent element is deleted. This configuration can be extracted as an invention.

Reference Signs List 1: accelerator pedal unit 5: housing 6: accelerator lever 7: erroneous stepping prevention device 10: accelerator opening sensor 11: rotating shaft 12: opening 15: rotating bearing 16: accelerator pedal 17: pedaling force transmission surface 20: Cylinder 21... Piston 22... Valve body 23... Push rod 24... Piston return spring 25... Cylinder main body 25a... Male threaded portion 26... Lid body 26a... Female threaded portion 26b... Through hole 27... Seal member 30... Partition wall 30a... First Spring bearing pin 33 ... Main communication hole 34 ... Sub communication hole 36 ... Valve body 36a ... Tapered surface 37 ... Outward flange 37a ... Second spring bearing pin 38 ... Valve body return spring 40 ... Hole 40a ... Opening 41 ... Contact Member O ... central axis

Claims (4)

a cylinder containing a fluid;
It has a partition wall that divides the first end side and the second end side inside the cylinder into a first chamber and a second chamber having variable volumes, and the partition wall includes the first chamber and the second chamber. a piston provided with a main communication hole and a secondary communication hole communicating with the
a normally open valve body provided in the second chamber and capable of closing the main communication hole due to an increase in pressure of the fluid on the side of the second chamber;
a push rod having a second end connected to the piston and capable of transmitting a pedaling force to a first end protruding outside the cylinder through the cylinder;
An accelerator pedal characterized in that the opening area of at least one of the main through hole and the sub through hole on the side of the second chamber is set larger than the area of the opening on the side of the first chamber. Accidental stepping prevention device. 2. The accelerator pedal erroneous depression prevention device according to claim 1, wherein the effective opening area of the auxiliary communication hole is relatively smaller than the effective opening area of the main communication hole. the main communication hole has a tapered surface with an inner diameter that tapers from the second chamber side toward the first chamber side,
The valve body has a tapered surface whose outer diameter decreases from the first end side toward the second end side,
3. The accelerator pedal according to claim 1, wherein the taper angle of the tapered surface of the valve body is set smaller than the taper angle of the tapered surface of the main communication hole. prevention device. a cylinder in which a fluid is enclosed; and a partition wall that partitions a first end portion side and a second end portion side inside the cylinder into a first chamber and a second chamber having variable volumes, and the partition wall includes the a piston provided with a main communication hole and a sub-communication hole communicating between the first chamber and the second chamber; a normally open valve body capable of closing the main communication hole and an erroneous stepping prevention device in which an opening area of at least one of the secondary communication holes on the second chamber side is set larger than an opening area on the first chamber side;
and an accelerator pedal unit capable of transmitting a pedaling force to the push rod.

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