JP4115738B2 - Brake pedal device for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle brake pedal device that can appropriately set a lever ratio characteristic with respect to a pedal stroke of a brake pedal and can realize excellent operability even when a sufficient space is not obtained.
[0002]
[Prior art]
In general, the characteristics of a vehicle brake pedal device depend on the lever ratio. For example, when a large lever ratio is used, a large braking force can be obtained with a small stepping force, but a large operation stroke is required to operate the brake pedal. Conversely, if the lever ratio is small, braking must be applied with a large stepping force, but a small operation stroke is sufficient. That is, when the lever ratio is large, the braking force can be easily controlled by the magnitude of the operation stroke, and when the lever ratio is small, the braking force can be easily controlled by the magnitude of the stepping force.
[0003]
Therefore, a preferable brake pedal device can be obtained if the lever ratio changes as the pedal stroke increases. As a brake pedal device focusing on this point, for example, there is a brake pedal device described in FIG. 3 of Japanese Patent Laid-Open No. 7-205776.
[0004]
In this brake pedal device, a brake pedal having a pad attached to a lower end and an upper end connected to a rotating spindle is bent into a "<" shape, and a push rod is connected to the bending point.
[0005]
However, the brake characteristic of this brake pedal device is not a preferable brake characteristic in which the lever ratio decreases as the operation stroke of the brake pedal increases (see FIG. 5 of the publication).
[0006]
If the swing angle of the push rod is set within an allowable range of twisting with respect to the master back, the master back must be largely separated from the brake pedal device (see FIG. 4 of the same publication). If the back is in a fixed position, the brake pedal itself must be lengthened, and in an actual vehicle, it must be provided through the upper panel.
[0007]
In order to improve such a point, the brake pedal device described in the above publication has a lever ratio that decreases as the operation stroke of the brake pedal increases, and in an idle region where the pedal stroke is extremely small compared to a practical range. Thus, the change rate of the lever ratio is reduced. In addition, the mounting characteristics superior to those of the conventional brake pedal device are realized because of the advantage that the swing angle of the push rod is advantageous because of its structural characteristics.
[0008]
[Problems to be solved by the invention]
However, in the brake pedal device having such a configuration, the pedal arm that transmits the pedal force and the push rod arm are coaxially connected via a link on the configuration, so that the steering shaft is located near the push rod arm. Etc., there is a problem that interference between the pedal arm and the steering shaft cannot be avoided.
[0009]
In particular, when sufficient mounting space in the front-rear direction orthogonal to the vehicle width cannot be obtained, the brake pedal, the connecting link, and the push rod are aligned along the surface extending in the front-rear direction, and the narrow foot becomes narrower. . In the present specification, front and rear means a direction orthogonal to the vehicle width, that is, front and rear in the longitudinal direction.
[0010]
The present invention has been made to solve the above-described problems of the prior art, has no problem in terms of mounting space, can avoid interference with a steering shaft, etc., and has an appropriate lever ratio characteristic with respect to the pedal stroke of the brake pedal. It is an object of the present invention to provide a vehicle brake pedal device that can be set to the above and can realize excellent operability.
[0011]
[Means for Solving the Problems]
The object of the present invention is achieved by the following means.
(1) In claim 1, an intermediate portion of a pedal arm having a pedal pad provided at a lower end portion is rotatably supported by a first support shaft fixed in position, and is parallel to the first support shaft. A transmission arm is pivotally supported by a second support shaft provided, the upper end of the pedal arm and the transmission arm are connected via a connection link, and the pedaling force of the pedal arm is transmitted to the pedaling force transmission member. In the vehicle brake pedal device,
The transmission arm includes a first transmission arm and a second transmission arm that are separated by a predetermined length in the axial direction of the second support shaft, and a base end portion of each transmission arm is used as the second support shaft. Are fixedly connected,
On the other hand, the second support shaft is provided so as to be positioned behind and above the first support shaft, and the upper end portion of the first transmission arm and the pedal arm, the base end portion of which is connected to the second support shaft. And the upper end of the
When the pedal arm is stepped forward of the vehicle, the upper end portion of the pedal arm displaces the first transmission arm rearward via the connection link, and when the pedal arm is further depressed, the upper end portion of the pedal arm 2 moves the connection link. And a brake pedal device for a vehicle, wherein the upper end of the first transmission arm is displaced obliquely upward.
(2) In claim 2, the second support shaft has an axis extending in the vehicle width direction, and at least the length of the distance between the first transmission arm and the second transmission arm is a steering shaft. (1) The vehicle brake pedal device according to (1), wherein the vehicle brake pedal device is set to be larger than an outer diameter of the vehicle.
[0012]
【The invention's effect】
According to the first aspect of the present invention, the transmission arm is constituted by the first transmission arm and the second transmission arm which are separated by a predetermined length in the axial direction of the second support shaft, and the distal end portion of the first transmission arm is connected to the connecting link. Since the tip of the second transmission arm is connected to the pedaling force transmission member, the position where the pedaling force of the pedal arm is applied and the position of output to the pedaling force transmission member can be offset in the vehicle width direction. A predetermined space can be secured at the lower end, and the pedaling force of the pedal arm can be transmitted to the pedaling force transmission member to perform a master back operation that is the same as that of a general brake pedal device. In particular, since the dimensions in the front-rear direction of the brake pedal device are extremely compact, the brake pedal device can be effectively installed in a narrow space in front of the front seat in the vehicle interior and has excellent mountability.
Also, the second support shaft is provided behind and above the first support shaft, the upper end portion of the pedal arm and the upper end portion of the first transmission arm are connected by a connecting link, and the first support shaft at the upper end portion of the pedal arm is connected. Since the rearward displacement centered on the upper end of the first transmission arm centered on the second support shaft is converted into a diagonally upward displacement, the upper end portions of the pedal arm and the first transmission arm Can be placed in the vicinity of the dash lower panel, and the distance from the dash lower panel to the rotation support shaft of the pedal arm can be dramatically reduced compared to the conventional device, realizing superior mountability compared to the conventional device. . In addition, the lever ratio characteristics of the brake pedal with respect to the pedal stroke can also be set appropriately, the lever ratio decreases as the brake pedal operation stroke increases, and the idle range where the pedal stroke is extremely small compared to the practical range. The excellent operability that the change rate of the lever ratio is small can also be realized.
In particular, if you want to make the master back smaller and secure space in the engine room, the stroke of the brake pedal device will inevitably become larger. It can also contribute to downsizing of the bag.
[0015]
According to claim 2, Shinnoshi the second support shaft in the vehicle width direction, the first transfer arm and the second transmitting arm is set larger than the outer diameter of at least the steering shaft length away, of the vehicle Even when the mounting space for the brake pedal device cannot be obtained due to the layout, interference with the steering shaft or the like can be easily avoided.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 shows an embodiment of the present invention, and is a cross-sectional view taken along line 1-1 of FIG. 2, and FIG. 2 is a plan equivalent view of FIG. 1 and 2, the vehicle brake pedal device according to the present embodiment is provided in the vicinity of a dash panel that partitions the engine room and the vehicle interior.
[0018]
The dash panel includes a lower panel 4 and an upper panel 5, and the upper panel 5 is welded so as to be substantially orthogonal to the lower panel 4. Further, three pedal brackets 1a, 1b, 1c are projected and attached to the vehicle interior.
[0019]
A first support shaft 3 extending in the vehicle width direction is provided between the pedal brackets 1a and 1b, and a second support shaft 15 is provided between the pedal brackets 1a and 1c to be fixed in position. The brake pedal device is supported by 15 and operates around these. The positional relationship between the first support shaft 3 and the second support shaft 15 is provided in the pedal bracket 1 so that the second support shaft 15 is positioned obliquely above the first support shaft 3.
[0020]
The first support shaft 3 rotatably supports an intermediate portion of the pedal arm 2 to which an occupant applies a stepping force in the brake pedal device. The support position of the pedal arm 2 by the first support shaft 3 is not particularly limited. For example, the pedal arm 2 is supported so that the upper end 2a and the lower end 2b have a ratio of approximately 1: 4. Has been. This is convenient in terms of mountability and operability.
[0021]
In the figure, "6" is a pedal pad 6 provided at the lower end of the pedal arm 2, and "16" is stretched between the pedal bracket 1 and the pedal arm 2 so that the pedal arm 2 is always attached rearward. This is a return spring.
[0022]
A transmission arm 12 is pivotally supported on the second support shaft 15. The transmission arm 12 includes a first transmission arm 12a to which the stepping force of the pedal arm 2 is transmitted through the connection links 9 and 10, and the first transmission arm 12a on the axis of the second support shaft 15. It consists of a second transmission arm 12b that is spaced apart by a predetermined length. The operation of the pedal arm 2 is controlled by the first transmission arm 12a, the connecting links 9, 10, the second transmission arm 12b, and the treading force transmission member 11. Is transmitted to a booster (not shown) such as a master back.
[0023]
The connecting links 9, 10 are provided so as to sandwich the upper ends of the pedal arm 2 and the first transmission arm 12 a from both sides, and are connected by pins 7, 8. Further, the treading force transmission member 11 that operates the master back is connected to the push rod 11a via the push rod pin 11b and the second transmission arm 12b.
[0024]
In particular, in the transmission arm 12 according to the present embodiment, as described above, the first transmission arm 12a and the second transmission arm 12b are separated by a predetermined length in the axial direction of the second support shaft 15, and the first transmission arm is separated. 12a is projected upward, and the second transmission arm 12b is projected downward. The base ends of the transmission arms 12a and 12b are fixedly connected to the second support shaft 15.
[0025]
If the transmission arms 12a and 12b are offset in the vehicle width direction in this way, the position of the stepping force applied by the occupant and the output position from the stepping force transmission member 11 can be obtained without affecting the operability of the brake. Can be shifted. That is, not only a master back operation that is the same as that of a general brake pedal device can be performed, but also a relatively large surplus space can be formed in the lower portion of the second support shaft 15.
[0026]
Therefore, the length at which the first transmission arm 12a and the second transmission arm 12b are separated from each other is set to be at least larger than the outer diameter of the steering shaft 17, and the space formed below the second support shaft 15 is set to the steering shaft 17. If this is used for the insertion of the pedal arm 2, the interference between the pedal arm 2 and the steering shaft 17, the steering bracket 18 and the like attached to the member M provided between the pillars can be easily avoided.
[0027]
In addition, the pedal arm 2 and the first transmission arm 12a according to the present embodiment are predetermined so that the upper end of the pedal arm 2 is inclined rearward and the first transmission arm 12a is inclined forward. Mounted at an angle.
[0028]
For this reason, the transmission mechanism for transmitting the pedaling force of the pedal arm 2 to the pedaling force transmission member 11 becomes extremely compact in the front-rear direction, and is connected to the upper ends of the pedal arm 2 and the first transmission arm 12a. The links 9 and 10 can be arranged in the vicinity of the dash lower panel 4, and the distance L from the dash lower panel 4 to the first support shaft 3 of the pedal arm 2 can be shortened as compared with the conventional apparatus. That is, since the thing of this embodiment becomes very compact in the front-back direction, the mounting property excellent compared with the conventional thing is implement | achieved.
[0029]
Further, the second support shaft 15 is provided behind and above the first support shaft 3, the upper end portion of the pedal arm 2 and the upper end portion of the first transmission arm 12a are connected by the connecting links 9, 10, and the pedal arm 2 is connected. When the upper end portion of the first transmission arm 12a is displaced rearward about the first support shaft 3, the upper end portion of the first transmission arm 12a about the second support shaft 15 is displaced obliquely upward via the connecting links 9, 10. It is configured. In this way, excellent operability can be realized as will be described later.
[0030]
The connecting links 9, 10, the first transmission arm 12a, and the pedal arm 2 are configured to be located on the same plane. With respect to the pedal arm 2, at least the upper half of the pedal arm 2 is on the same plane. It suffices if it is located above, and it does not necessarily have to be the whole. Further, since the push rod pin 11b, the first support shaft 3 and the stepping force transmission member 11 at the tip of the second transmission arm 12b are arranged on the same plane, not only is it easy to balance input and output, The force transmission member 11 can be displaced linearly as much as possible, which is preferable.
[0031]
Next, the operation will be described.
[0032]
FIG. 3 is an explanatory view showing an operating state of the embodiment. In FIG. 3, first, when the pedal pad 6 at the lower end of the pedal arm 2 is stepped forward in the vehicle, the upper end portion of the pedal arm 2 rotates rearward with the first support shaft 3 as the center of rotation. Then, the first transmission arm 12a is displaced rearward. Accordingly, the lower end of the second transmission arm 12b is displaced forward with the second support shaft 15 as the center of rotation, and the pedal arm 2 is connected to the master back (not shown) via the stepping force transmission member 11 connected to the lower end. Transmit the treading force.
[0033]
Here, the pedal arm 2 is set so that the upper end 2a and the lower end 2b have a relatively large ratio of, for example, approximately 1: 4. Is small.
[0034]
When the pedal is further stepped on, the upper end portion of the pedal arm 2 rotates backward about the first support shaft 3 as described above, but the second support shaft 15 which is the support shaft of the first transmission arm 12a is the first support shaft 15a. Since the links 9 and 10 and the first transmission arm 12a are displaced rearward because they are provided above the support shaft 3, they are displaced obliquely upward. Therefore, the displacement amount of the first transmission arm 12a rotating backward does not become the displacement amount of the second transmission arm 12b, and a large braking force is generated with a small stroke.
[0035]
Therefore, the vehicle brake pedal device has good operability in that the braking force can be adjusted by controlling the operation stroke when the braking force is small and by controlling the stepping force when the braking force is large.
[0036]
As described above, according to the present embodiment, the pedal arm 2 is rotatably supported, the upper end portion of the pedal arm 2 protrudes above the first support shaft 3, and behind the first support shaft 3. A second support shaft 15 provided in parallel has a first transmission arm 12a whose upper end protrudes above the second support shaft 15, and an offset arrangement in the vehicle width direction with respect to the first transmission arm 12a. The second transmission arm 12b, the tip of which protrudes downward from the second support shaft 15, is fixed, and the upper end of the pedal arm 2 and the upper end of the first transmission arm 12a are connected to the link 9 , 10 and the pedaling force of the pedal arm 2 is transmitted to the pedaling force transmission member 11, so that a master back operation that is the same as that of a general brake pedal device can be performed. Brake pen depending on layout Even if the mounting space for Le device is not sufficiently obtained, easily installed, yet, would be avoided interference with the steering shaft 17 and the steering brackets 18 and the like.
[0037]
In addition, the connection links 9 and 10 that connect the upper end of the pedal arm 2 and the upper end of the first transmission arm 12a are disposed above the first support shaft 3 and the second support shaft 15, so that the pedal arm 2 is The upper end portion and the upper end portion of the first transmission arm 12a can be disposed in the vicinity of the dash lower panel 4, and the distance from the dash lower panel 4 to the first support shaft 3 can be dramatically reduced as compared with the conventional apparatus. As a result, it is possible to realize superior mountability as compared with conventional devices. In particular, since the dimension in the vehicle longitudinal direction can be made extremely compact, the stroke of the brake pedal can also be increased. As a result, the master back can be downsized or the degree of freedom in designing the master back can be increased.
[0038]
The present invention is not limited to the above-described embodiments, and can be variously modified and used within the scope of the claims. Since the second support shaft 15 of the above-described embodiment is provided behind the first support shaft 3, it is advantageous in terms of space and mountability is improved. It may be provided in front of the first support shaft 3.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is a plan equivalent view of FIG. 1;
FIG. 3 is an explanatory diagram showing an operating state of the embodiment.
[Explanation of symbols]
1 ... Pedal bracket,
2 ... Pedal arm,
3 ... 1st support shaft,
6 ... Pedal pads,
9, 10 ... link,
11 ... treading force transmission member,
12 ... Transmission arm,
12a ... first transmission arm,
12b ... second transmission arm,
15 ... second support shaft,
17 ... Steering shaft.

Claims (2)

An intermediate portion of a pedal arm (2) having a pedal pad (6) at the lower end is rotatably supported by a first support shaft (3) fixed in position, and is parallel to the first support shaft (3). The transmission arm (12) is pivotally supported by the second support shaft (15) provided on the pedal, and the upper end of the pedal arm (2) and the transmission arm (12) are connected via the connecting links (9, 10). In the vehicle brake pedal device connected and configured to transmit the stepping force of the pedal arm (2) to the stepping force transmission member (11),
The transmission arm (12) is composed of a first transmission arm (12a) and a second transmission arm (12b) separated by a predetermined length in the axial direction of the second support shaft (15). The base end of the arm is fixedly connected to the second support shaft (15),
On the other hand, the second support shaft (15) is provided so as to be positioned rearward and above the first support shaft (3), and the base end portion is connected to the second support shaft (15). The upper end of the transmission arm (12a) and the upper end of the pedal arm (2) are connected by the connecting link (9, 10),
When the pedal arm (2) is stepped forward of the vehicle, the upper end of the pedal arm (2) displaces the first transmission arm (12a) to the rear via the connection link (9, 10), and further vehicle brake, characterized in that it has a structure to displace the upper portion obliquely above the said upper end portion of the pedal arm 2 through the connecting link (9, 10) the first transmission arm (12a) by depressing Pedal device.   The second support shaft (15) has an axial line extending in the vehicle width direction, and has a length at which the first transmission arm (12a) and the second transmission arm (12b) are separated from each other at least by the steering shaft (17). The brake pedal device for a vehicle according to claim 1, wherein the brake pedal device is set to be larger than an outer diameter of the vehicle.

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