JP2020113224A - Hollow pedal member - Google Patents

Abstract

To integrate a pedal arm and a cylindrical boss without welding to thereby ensure reduction of the thickness of the hollow pedal arm formed of a steel plate.SOLUTION: The hollow pedal member 14 includes an elongated pedal arm 16 formed of a steel plate in a hollow shape, a pedal tread surface provided on one end side of the pedal arm 16, and a cylindrical boss 20 arranged on the other end side of the pedal arm 16 to be rotatably supported on a support bracket 12. The cylindrical boss 20 is axially divided into two parts arranged between opposing side surfaces 16Rt, 16Lt of the hollow pedal arm 16. A first member 20R and a second member 20L of the bisected boss 20 are moved apart by relative rotation of axial movement means 30 formed by a cam surface shape 32, and the boss 20 is fixed to the pedal arm 16.SELECTED DRAWING: Figure 3

Description

The present invention relates to hollow pedal members. In particular, it relates to a hollow pedal member used in a foot-operated brake pedal device applied to a vehicle such as an automobile.

A vehicle such as an automobile is provided with a brake device for stopping the vehicle. There are various brake devices, and one of them is a foot-operated brake device that is operated by stepping on the foot. The foot-operated brake device is mounted and mounted on a support bracket of a vehicle body which is arranged in the front part of a driver's seat of a vehicle such as an automobile.

The foot-operated brake device includes a long pedal arm, a pedal tread that is attached to one end of the pedal arm and is operated by the operator's foot, and a pedal arm that supports the pedal arm so that the pedal arm can rotate. And a boss disposed on the other end side. The boss has a cylindrical shape that is fitted and arranged in a shaft member attached to the support bracket, and is fixedly attached to the pedal arm.

By the way, since the pedal arm has a long shape, it is heavy when formed of a solid steel member. Therefore, it has been proposed to form a steel plate in a hollow shape to reduce the weight (see Patent Document 1 below). In this case, the cylindrical boss fixedly attached to the other end of the pedal arm is also made of steel, and is fixedly attached by arc welding.

FIG. 20 is a sectional view showing a structure in which the other end of the pedal arm 116 is attached to the support bracket 112 via the boss 120. The pedal arm 116 is formed in a hollow shape C by joining two members 116R and 116L made of steel plates, which are formed separately, by plasma welding PW. The other end side of the pedal arm 116 shown in FIG. 20 has a hollow shape C in which the upper side in the drawing is an open state K.

The boss 120 is formed in a cylindrical shape, and is fitted and attached to a bolt shaft 122 which is attached in a state of bridging to the support brackets 112 arranged on the left and right sides in FIG. The boss 120 is rotatably attached to the bolt shaft 122. Therefore, the cylindrical pipe 124 and the bush 150 are inserted between the boss 120 and the bolt shaft 122.

The boss 120 and the pedal arm 116 are integrated by arranging two hollow member-shaped steel plate members 116R and 116L of the pedal arm 116, which are fitted to each other, on the outer surface of the cylinder. The fitting parts are fixed and integrated by arc welding AW. As a result, the pedal arm 116 is integrated with the boss 120, is rotatable with respect to the bolt shaft 122, and is attached to the support bracket 112.

JP, 2009-251689, A JP, 2000-344064, A

By the way, in the foot-operated brake device, further weight reduction is an issue. Therefore, it is conceivable to reduce the thickness of the steel plate forming the hollow pedal arm to reduce the weight.

However. When the steel boss and the steel plate pedal arm described above are integrated, conventionally, the two are integrated by arc welding. Therefore, if the steel plate of the pedal arm made of steel plate is thinned and welded, there is a problem that the melting edge of the steel plate occurs during arc welding. That is, when the method of integrating by arc welding is adopted, there is a limitation on the plate thickness due to welding heat, and there is a limit to thin the steel plate.

Therefore, the present invention was devised to solve the above-mentioned problems, and the problem to be solved by the present invention is to integrate a pedal arm and a cylindrical boss without welding. By making it possible, it is possible to further reduce the thickness of the hollow pedal arm made of a steel plate.

In order to solve the above-mentioned subject, the hollow pedal member concerning the present invention takes the following means.

1st invention of this invention WHEREIN: The long-shaped pedal arm formed in the hollow by the steel plate, the pedal tread surface provided in the one end side of the said pedal arm, and the rotation on the support bracket at the other end side of the said pedal arm. A hollow pedal member provided with a cylindrical boss arranged to movably support the pair of opposed side surfaces forming a hollow portion portion on the other end side of the pedal arm where the boss is arranged. The bosses are formed in parallel planes, and cylindrical bosses are formed by dividing the bosses into two in the axial direction between the opposing side surfaces. The first member and the second member of the two bosses are the relative parts of both members. A hollow pedal member, which is provided with an axial moving means that moves in a separating direction by rotation, and in which the boss is integrally fixed to the pedal arm by the movement of both members in the separating direction by the axial moving means. is there.

A second invention of the present invention is the hollow pedal member of the above-mentioned first invention, wherein the first member of the boss divided into two parts is provided on a side surface of the pedal arm on which the boss is disposed. And an insertion hole into which the second member can be inserted into the hollow space portion are formed. On the other hand, the first member and the second member of the boss are inserted into the hollow member, and then the both members are inserted into the hollow member. As the relative rotation changes, the relative positional relationship with respect to the facing side surface is also changed to form a retaining portion capable of engaging with the opposing side surface and preventing the retaining, and the insertion hole can also be inserted with the retaining portion. It is a hollow pedal member formed as a shape.

A third invention of the present invention is the hollow pedal member according to the above-mentioned first invention or the second invention, wherein the axial moving means is a first member of the boss divided into two and a second member. A hollow pedal member having a cam surface shape capable of axially displacing both members formed between the members.

A fourth invention of the present invention is the hollow pedal member according to the above-mentioned third invention, wherein the cam surface shape has a concave-convex member at a predetermined relative rotation position of the first member and the second member. It is a hollow pedal member on which a positioning means is formed.

A fifth invention of the present invention is the hollow pedal member according to any one of the above-mentioned first to fourth inventions, wherein the axial center of the first member and the second member of the boss divided into two parts. Is a hollow pedal member having a cylindrical pipe penetrating therethrough.

A sixth invention of the present invention is the hollow pedal member according to any one of the first to fifth inventions described above, wherein the pedal arm is formed from the first member and the second member forming the boss. It is a hollow pedal member in which a nut shape is formed at the end protruding outside.

A seventh invention of the present invention is the hollow pedal member according to any one of the first to sixth inventions described above, wherein the first member and the second member forming the boss are both made of resin. It is a formed hollow pedal member.

According to the present invention of the above-described means, the pedal arm and the cylindrical boss are integrated without welding, thereby making it possible to further reduce the thickness of the hollow pedal arm formed of a steel plate. can do.

It is a whole block diagram of a foot-operated brake device. It is a perspective view which extracts and shows the upper site part of a hollow pedal member. FIG. 3 is a sectional view taken along the line III-III of FIG. 1. It is a perspective view showing the state where the 1st member and the 2nd member of the boss divided into two were combined. It is a front view showing a single item of one member which forms a boss. It is the perspective view which looked at the member from the nut shape side. It is the side view which looked at the member from the nut shape side. It is the perspective view which looked at the member from the cam surface shape side. It is the side view which looked at the member from the cam surface shape side. It is a figure which shows the principle of the operation|movement by a cam surface shape, and shows the initial state which combined and arranged the 1st member and the 2nd member of a boss. FIG. 11 is a diagram showing a state in which the first member and the second member of the boss are relatively rotated and moved apart from each other from the state of FIG. 10 so that both members are fixed between the facing surfaces of the pedal arm. It is a figure which shows the detailed structure of a cam surface shape, and shows the initial state before a relative rotation. Similarly, it is a figure which shows the detailed structure of a cam surface shape, and shows a state in the middle of relative rotation. Similarly, it is a figure which shows the detailed structure of a cam surface shape, and shows the state which was positioned after relative rotation. It is a perspective view showing a state where a boss divided into two is inserted into a hollow space of a pedal arm from an insertion hole. It is a side view showing the state where a boss is inserted from an insertion hole. FIG. 6 is a side view showing a state in which a boss inserted in an insertion hole is rotated to prevent it from coming off. It is sectional drawing which shows 2nd Embodiment of the boss arrangement|positioning part which has the bush shown corresponding to FIG. It is a figure which shows 2nd Embodiment of the retaining|prevention part of the boss illustrated corresponding to FIG. 16 and FIG. FIG. 4 is a cross-sectional view of a conventional boss arrangement portion corresponding to FIG. 3.

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the present embodiment is a hollow pedal member in a foot-operated brake device equipped in the front portion of a driver's seat of a vehicle such as an automobile. It should be noted that the up/down, front/rear, left/right, etc. direction indications in the respective figures are those as viewed in the traveling direction of a vehicle such as an automobile. However, the indications individually shown are based on the indications. When the left and right parts are individually referred to when the left and right parts are present, L is attached to the left part and R is attached to the right part at the end of the reference numeral indicating the part. Attached and shown.

<About the foot-operated brake device 10>
FIG. 1 shows the overall structure of a foot-operated brake device 10. FIG. 2 is an enlarged view of the upper portion of the hollow pedal member 14 in FIG. FIG. 3 shows a cross section taken along the line III-III in FIG. The foot-operated brake device 10 is mounted on the lower part of the front part of the driver's seat of the automobile. In the foot-operated brake device 10, a hollow pedal member 14 is rotatably attached to a support bracket 12 that is integrally disposed on the vehicle body at the front of the driver's seat. As shown in FIG. 1, the support bracket 12 includes a right support bracket 12R and a left support bracket 12L. Both of the support brackets 12R and 12L are integrally attached to the vehicle body in the front part of the driver's seat in a state of being spaced apart from each other on the left and right. The hollow pedal member 14 is arranged between the right side support bracket 12R and the left side support bracket 12L.

<About the hollow pedal member 14>
The hollow pedal member 14 includes an elongated pedal arm 16, a pedal tread 18 provided at one end of the pedal arm 16, and a boss 20 provided at the other end of the pedal arm 16 (see FIGS. 2 and 3 ). ) And. As shown in FIG. 1, the elongated pedal arm 16 is arranged in the up-down direction, and is arranged in an inclined state in which the lower side is slightly offset from the upper side to the right side. The pedal tread 18 is integrally attached to the lower end of the elongated pedal arm 16, and is arranged at a position where the driver can step on it with his/her foot. The pedal tread 18 has a shape that can be easily operated, and in the present embodiment, the tread plate has a horizontally long rectangular shape. The boss 20 shown in FIG. 3 is integrally fixed and arranged on the upper end side of the elongated pedal arm 16 shown in FIGS.

In the stepping operation by the pedal tread surface 18 in the foot-operated brake device 10, the link mechanism engaged with the booster coupling engagement hole 48 formed in the middle of the pedal arm 16 shown in FIG. 2 by the rotation of the pedal arm 16. It is transmitted to a brake booster (not shown) through (not shown). Then, the brake operating hydraulic cylinder is operated to perform the brake operation.

The pedal arm 16 is formed as a form in which two L-shaped members 16R, 16L are butted to form a space S between the two members 16R, 16L, as shown in the sectional view of FIG. There is. The abutting flange portions 16Rf and 16Lf of the two members 16R and 16L are integrated by plasma welding PW. The two members 16R and 16L of the pedal arm 16 are integrated on the lower side, that is, on the driver's side in FIG. Therefore, as shown in FIG. 2, the anti-driver side on the upper side is in the open form K. Thereby, in this embodiment, the hollow shape C of the pedal arm 16 formed of a steel plate is formed.

The hollow shape C of the pedal arm 16 is formed by abutting two members 16R and 16L having a hat-shaped cross section, as shown in the schematic diagrams of FIGS. 10 and 11 for explaining the operation principle of a cam surface shape 32 described later. You may comprise. Alternatively, two members having a U-shaped cross section without the flange portions 16Rf and 16Lf in the hat-shaped cross section may be abutted against each other.

As shown in FIG. 3, the upper end of the pedal arm 16 is rotatably attached to the support bracket 12 by a bolt shaft 22 arranged so as to bridge between the right support bracket 12R and the left support bracket 12L. A cylindrical pipe 24 is fitted and disposed on the bolt shaft 22, and the length of the cylindrical pipe 24 determines the distance between the right support bracket 12R and the left support bracket 12L. The spacing between the two support brackets 12R and 12L is regulated by fastening and fixing the bolt shaft 22 and the nut 26.

<About boss 20>
The cylindrical boss 20 is rotatably fitted and disposed on the bolt shaft 22 and the cylindrical pipe 24 described above. The cylindrical boss 20 is formed so as to be divided into two in the axial direction and is fixed to the pedal arm 16. The boss 20 on the right side in FIG. 3 is the first member 20R, and the boss 20 on the left side is the second member 20L. The opposing side surfaces 16Rt and 16Lt forming the hollow portion of the pedal arm 16 in which the boss 20 is disposed are formed in parallel with each other, and the main portion of the boss 20 (a protrusion 36 described later is formed between them). Part) is positioned and fixed.

4 to 9 show a boss 20 formed in two parts. FIG. 4 is a perspective view showing a state in which the first member 20R and the second member 20L divided into two are combined. 5 to 9 are single-part views of one member forming the boss 20, FIG. 5 is a front view, FIG. 6 is a perspective view seen from the nut shape side, FIG. 7 is the same side view, and FIG. 8 is a cam shape. FIG. 9 is a perspective view seen from the side, and FIG. 9 is a side view of the same. As shown in FIG. 4, the first member 20R and the second member 20L divided into two parts of the boss 20 are formed in a substantially cylindrical shape, and one end surface of each of the two cylindrical members 20R and 20L is face-matched. Then, they are arranged in a state of being combined in the axial direction. In this embodiment, the boss 20 is made of resin, so that the weight is reduced and the molding is facilitated.

As shown in FIGS. 6 and 7, the boss 20 alone has a nut shape 28 formed on the other end surface, and as shown in FIGS. 8 and 9, the boss 20 is formed on one end surface. Has a cam surface shape 32. This cam surface shape 32 corresponds to the axial moving means 30 of the present invention, and as shown in FIG. 4, when the first member 20R and the second member 20L formed in two parts are combined, both members 20R, 20L. The function of moving both members 20R and 20L in the separating direction by the relative rotation of. A protrusion 36 is formed on the outer peripheral surface of the boss 20 so as to protrude radially outward. The protrusion 36 corresponds to the retaining portion 34 of the present invention, and has a function of preventing the first member 20R and the second member 20L inserted into the space S of the pedal arm 16 from retaining. Details of these functions are described below.

<Axial moving means 30 with cam surface shape 32>
First, the function of the cam surface shape 32 formed on the one end side surface of the boss 20 as the axial moving means 30 will be described. 10 and 11 show the principle of operation by the cam surface shape 32, FIG. 10 shows the initial state in which the first member 20R and the second member 20L are combined and arranged, and FIG. 11 shows both members 20R, 20L in the pedal arm. 16 shows a state of relative rotation for fixing between 16 opposite side surfaces 16Rt, 16Lt. As shown in FIG. 10, the cam surface shapes 32R and 32L formed on the first member 20R and the second member 20L are stepped shapes inclined in the circumferential direction, and the inclined shapes of both members 20R and 20L can be face-matched. It is formed as an arrangement form. That is, the cam surface shapes 32R and 32L of both the members 20R and 20L have the same inclined surface shape in the opposite circumferential direction. As a result, when the two members 20R and 20L are rotated relative to each other, the state shown in FIG. 10 is changed to the state shown in FIG. Moving. That is, it is displaced in the axial direction.

According to the above-described separation movement of the first member 20R and the second member 20L, the arrangement relationship in the space S between the facing side surfaces 16Rt, 16Lt of the pedal arm 16 on which the both members 20R, 20L are arranged is as follows. Like That is, as shown in FIG. 10, the space width between the facing side surfaces 16Rt, 16Lt of the pedal arm 16 is set to A, and the initial state of the boss combination width of the first member 20R and the second member 20L arranged in combination is shown. Assuming B1, A>B1 in the state of FIG. That is, there is a gap between the facing side surfaces 16Rt, 16Lt of the pedal arm 16 and the boss combination width B, and the boss 20 is in a relatively rotatable state in the space between the facing side surfaces 16Rt, 16Lt of the pedal arm 16. ..

When the first member 20R and the second member 20L are rotated relative to each other in the direction in which the cam surface shapes 32R and 32L ride on each other (direction of the arrow in FIG. 10) from the state of FIG. 10, the mutual cam surface shapes shown in FIG. The 32R and 32L are in a riding state. Assuming that the boss combination width in the state where the cam surface shapes shown in FIG. 11 ride on each other is B2, A<B2 in the state of FIG. 11. Accordingly, in this state, the other end side surfaces 33R and 33L of the first member 20R and the second member 20L, on which the nut shapes 28 on the side opposite to the side on which the cam surface shapes 32R and 32L are formed, are formed, are the other side surfaces of the pedal arm 16. The opposite side surfaces 16Rt and 16Lt are pressed and fixed.

<Regarding Positioning Means 38 by Engaging Concavo-Convex>
12 to 14 show a detailed configuration of the cam surface shape 32. This detailed configuration is a configuration in which a positioning means 38 is provided for positioning by the concave-convex engagement when the first member 20R and the second member 20L relatively rotate. FIG. 12 shows an initial state before relative rotation. FIG. 13 shows a state in which the relative rotation is in progress, and FIG. In the present embodiment, in the positioning means 38, the apex of the mountain-shaped portion formed by the inclined surface in the cam surface shape 32 described above in these figures is the convex shape 44 and is adjacent to the convex shape 44. Then, the concave shape 46 is formed.

As the cam surface shapes 32R and 32L of the first member 20R and the second member 20L move relative to each other, the cam surface shapes 32R and 32L are changed from the state shown in FIG. 12 to the state shown in FIG. 14 via the state shown in FIG. Become. In the state of FIG. 14, the convex shape 44 forming the cam surface shape 32 is engaged with the opposed concave shape 46 to be positioned. As a result, the positioning of the first members 20R and 20L when they are moved relative to each other is performed with a sense of moderation.

The depth of the concave shape 46 is lower than the inclined surface height of the cam surface shape 32 forming the convex shape 44. As a result, when the convex shape 44 is engaged with the concave shape 46, the first member 20R and the second member 20L are moved away from each other in the axial direction by the difference in height between the two. The amount of separation movement is shown as Y in FIG.

Further, as well shown in FIG. 14, in the present embodiment, the step forming the concave shape 46 is formed as a vertical step shape. Along with this, one end of the apex forming the convex shape 44 facing each other is also formed in a vertical step shape. As a result, when they move relative to each other, the vertical step shape and the vertical step shape are engaged with each other, and an engagement sound "koton" is produced. As a result, the operator can surely grasp the positioning at the positioning position. Further, the engagement of the convex shape 44 and the concave shape 46 also prevents rotation in the opposite direction.

<Regarding the retaining portion 34 (projection portion 36)>
Next, a configuration for preventing the boss 20 inserted into the space S of the opposing side surfaces 16Rt, 16Lt of the pedal arm 16 from coming off will be described. As a configuration therefor, as described above, the protrusions 36 are formed on the outer peripheral portions of the first member 20R and the second member 20L forming the boss 20, respectively. As shown in each of FIGS. 4 to 9, the protrusions 36 are formed at three positions on the outer periphery at equal intervals. The protrusion 36 is formed to extend in the axial direction. In the present embodiment, the boss 20 having the protrusion 36 is inserted into the hollow space S from the outside of the two members 16R and 16L forming the hollow space S of the pedal arm 16. ..

Therefore, as shown in FIG. 15, the insertion holes into which the first member 20R and the second member 20L of the boss 20 can be inserted into the two members 16R and 16L forming the hollow space S of the pedal arm 16. 40R and 40L are provided, respectively. Therefore, as shown in FIGS. 16 and 17, in the insertion hole 40, notch protrusion shapes 42 corresponding to the protrusions 36 formed on the first member 20R and the second member 20L of the boss 20 are arranged at equal intervals. It is formed in three places. As a result, the first member 20R and the second member 20L of the boss 20 are inserted into the hollow space S formed by the two members 16R and 16L of the pedal arm 16 through the insertion hole 40 in which the notch protrusion shape 42 is formed. Inserted in.

When the protrusion 36 passes through the notch protrusion shape 42 of the insertion hole 40, the first member 20R and the second member 20L are made rotatable relative to each other, and are shown in FIGS. 10 to 11 and 12 to 14 described above. Rotate relative to each other. With the relative rotation of the two members 20R, 20L, the positional relationship between the protrusion 36 of the boss 20 and the notch protrusion 42 of the insertion hole 40 becomes the state shown in FIG. Is in a position in which it engages with the opposite side surfaces 16Rf, 16Lf of the pedal arm 16. As a result, the first member 20R and the second member 20L of the boss 20 have a positional relationship in which they cannot be pulled out from the hollow space S. This prevents the inserted members 20R and 20L from coming off from the hollow space S. The relative rotation of the first member 20R and the second member 20L is performed by engaging a spanner with a nut shape 28 formed on the other end side of both the members 20R and 20L. As a result, both members 20R, 20L can be easily rotated relative to each other, and both members 20R, 20L can be securely crimped and fixed between the opposing side surfaces 16Rt, 16Lt of the pedal arm 16.

A protrusion 36 is formed on the outer peripheral surface of the boss 20 so as to protrude radially outward. The protrusion 36 corresponds to the retaining portion 34 of the present invention, and has a function of preventing the first member 20R and the second member 20L inserted into the space S of the pedal arm 16 from retaining.

<Assembling method of boss 20>
Next, a method of inserting and fixing the boss 20 into the space S of the pedal arm 16 will be described. First, as shown in FIG. 15, the notch protrusion shape 42 of the insertion hole 40 formed in the pedal arm 16 and the protrusion 36 formed on the boss 20 are aligned and inserted. The state is the state shown in FIG. Note that, as shown in FIG. 15, the first member 20R and the second member 20L of the boss 20 divided into two are arranged with the cam surface shapes 32 on the other end side facing each other, and inserted from the opposite direction. To be done.

The state of FIG. 4 shows a state in which the boss 20 is inserted into the space S of the pedal arm 16 and the cam surface shapes 32 of the first member 20R and the second member 20L are in close contact with each other. This state is the state shown in FIGS.

From the above state, the first member 20R and the second member 20L of the boss 20 are relatively rotated. The relative rotation is performed by engaging a spanner with the nut shape 28 formed on each of the members 20R and 20L. As a result, the first member 20R and the second member 20L of the boss 20 axially move in the separating direction due to the cam surface shapes 32 of each other. This state is the state shown in FIGS. 10 to 11 and the state shown in FIGS. 12 to 14. In the state of relative rotation of FIG. 11 and FIG. 14, the other end surface of the boss 20, in the case of FIG. 14, the other end surface of the protrusion 36 formed on the boss 20 in the case of FIG. The boss 20 is fixed to the pedal arm 16 by pressure-bonding to the inner surface of the formed space S, that is, the opposite side surfaces 16Rt and 16Lt. This state is the state shown in FIG. Therefore, in the state shown in FIG. 3, the pedal arm 16 and the boss 20 are integrally rotatable with respect to the support bracket 12. The rotation of the pedal arm 16 with respect to the support bracket 12 is performed by rotation about the bolt shaft 22 fixed to the support bracket 12.

<Operation and effect of this embodiment>
In the above-described embodiment, the boss 20 and the pedal arm 16 are integrally fixed to each other without welding as in the conventional case. In the case of integrally fixing by welding, there is a certain limit from the viewpoint of welding in order to reduce the thickness of the steel plate that forms the pedal arm 16 by melting. However, in the present embodiment, the pedal arm 16 is fixed without welding, so that the thickness of the steel plate forming the pedal arm 16 can be reduced within a range in which strength is allowed, and the pedal arm 16 can be reduced in weight. Can be planned.

In addition, by forming the boss 20 with resin, the weight of the hollow pedal member 14 can be further reduced.

<Second embodiment in which boss 20 is arranged on bolt shaft 22>
FIG. 18 shows the second embodiment in a state corresponding to FIG. In the second embodiment, a bush 50 is arranged between the boss 20 and a cylindrical pipe 24 fitted and arranged on the bolt shaft 22. The bush 50 is arranged on the inner periphery of the first member 20R and the second member 20L of the boss 20 on the side of the nut shape 28, and the end surfaces on the sides facing the left and right support brackets 12R and 12L are formed in the flange portion. There is. As a result, the rotary sliding of the boss 20 with respect to the cylindrical pipe 24 is performed more smoothly.

<Second embodiment of retaining portion 34>
FIG. 19 shows a second embodiment of the retaining portion 34, which is illustrated corresponding to FIGS. 16 and 17. The configuration of the retaining portion 34 of the above-described embodiment is a configuration in which three protrusions 36 are provided on the outer peripheral surfaces of the first member 20R and the second member 20L of the boss, but in the second embodiment, this is an ellipse. It has a shape 52. In the second embodiment, the insertion hole 54 formed in the pedal arm 16 corresponding to the elliptical shape 52 is also formed into the corresponding elliptical shape. As a result, the boss 20 is inserted into the space S of the pedal arm 16 through the elliptical insertion hole 52, and the relative rotation of the boss causes the positional relationship of the boss 20 with respect to the elliptical shape 52 to be in a state indicated by a virtual line. It is possible to prevent the boss 20 from coming off.

<Other embodiments>
Although the specific embodiment of the present invention has been described above, the present invention can be implemented in various other modes.

For example, the above embodiment is the case of the hollow pedal member 14 used in the foot-operated brake device 10 applied to a vehicle such as an automobile, but in the present invention, the pedal arm 16 is formed in a hollow shape, and the hollow portion has a cylindrical shape. The configuration in which the boss 20 is arranged can be widely applied to other uses.

Further, in the above-described embodiment, the insertion holes 40 of the boss 20 are provided on the facing side surfaces 16Rt and 16Lt of the pedal arm 16. However, when the boss 20 is installed from the open form K forming the hollow space, the insertion hole 40 is not always necessary.

Further, in the above embodiment, the first member 20R and the second member 20L of the boss 20 are provided with the retaining portions 34 for the protrusions 36. However, if the insertion holes 40 of the boss 20 are not provided on the opposite side surfaces 16Rt, 16Lt of the pedal arm 16, the retaining portion 34 is not necessary.

Further, in the above-described embodiment, three protrusions 36 serving as the retaining portions 34 are provided on the outer circumference of the boss 20. However, the number of protrusions 36 may be any number. In the case of a plurality, it is preferable to arrange them at equal intervals.

Further, the axial moving means 30 in the above embodiment is the cam surface shape 32 formed between the first member 20R and the second member 20L of the boss 20. However, any mechanism may be used as long as the first member 20R and the second member 20L rotate relative to each other so that the two members 20R and 20L can move axially away from each other.

Further, in the above embodiment, the positioning means 38 when the first member 20R and the second member 20L of the boss 20 are rotated relative to each other is concave and convex engagement, but the positioning means 38 may be positioned by other means. For example, the first member 20R and the second member 20L may be positioned by a fixed pressure due to relative rotation.

Further, in the above-described embodiment, the cylindrical pipe 24 is arranged at the axial center of the boss 20, but the cylindrical pipe 24 may not be arranged. However, it is preferable to dispose from the viewpoint of smoothly rotating the boss 20.

Further, in the above-described embodiment, the nut shape 28 that can be used by a tool such as a spanner is used as the configuration for rotating the first member 20R and the second member 20L of the boss 20. However, the configuration may be such that it can be rotated by another tool. For example, the shape may be such that it can be rotated by a tool such as a driver.

Further, in the above embodiment, both the first member 20R and the second member 20L of the boss 20 are made of resin, but other materials such as iron-based material may be used. However, it is desirable to use a material that can reduce the weight as in the present embodiment.

<Effect of each invention described in "Means for solving problems">
Finally, the operational effects of the above-described embodiments corresponding to the respective inventions in the above-mentioned "means for solving the problem" will be additionally described.

First, according to the first aspect of the present invention, since the elongated pedal arm is a hollow steel plate, the weight can be reduced as compared with the solid pedal arm. Furthermore, since the boss and the pedal arm are integrated without welding, the steel plate forming the pedal arm can be made thinner without causing the melting edge of the steel plate unlike the conventional case. The weight can be reduced.

In particular, according to the first aspect of the present invention, the boss and the pedal arm are integrated without welding, that is, the hollow cylindrical pedal arm is disposed between the opposed side surfaces of the pedal arm. The first moving member and the second moving member have axial movement means. Specifically, the boss is crimped and fixed between the opposing side surfaces of the pedal arm by a mechanism in which the axial moving means moves the first member and the second member in the separating direction by the relative rotation of the first member and the second member. To do. Accordingly, the boss can be fixed to the pedal arm by a simple operation of relatively rotating the first member and the second member.

Next, according to the second invention, the first member and the second member forming the boss are inserted into the hollow space from the outside of the pedal arm through the insertion hole formed in the pedal arm. This allows the boss to be easily installed in the pedal arm.

Further, according to the second aspect of the invention, the relative positional relationship of the pedal arm with respect to the opposite side surface of the first and second members of the boss after the both members are inserted through the insertion holes is relatively rotated. A slip-off preventing portion capable of engaging with the facing side surface and preventing slipping out. The insertion hole has a shape that allows the retaining portion to communicate with each other. Accordingly, the relative rotation after the insertion of the first member and the second member can reliably prevent the first member and the second member from coming off after the insertion into the pedal arm.

Next, according to the third invention, the axial moving means is constituted by a cam surface shape formed between the first member and the second member of the boss. Accordingly, by rotating at least one of the first member and the second member, both members can be brought into a state of being displaced in the axial separation direction.

Next, according to the fourth aspect of the present invention, the positioning means by the concave and convex engagement is formed in a cam surface shape at a predetermined relative rotational position of the first member and the second member of the boss. This allows the first member and the second member to be positioned at a predetermined relative rotation position.

Next, according to the fifth aspect of the invention, the cylindrical pipe is disposed so as to pass through the axial center of the first member and the second member of the boss divided into two. Accordingly, the first member and the second member of the boss can be easily arranged using the cylindrical pipe as a guide member.

Next, according to the sixth aspect of the present invention, a nut shape is formed at the ends of the first member and the second member that form the boss, the ends protruding from the pedal arm. Accordingly, the first member and the second member can be easily rotated by a tool such as a spanner.

Next, according to the seventh aspect, both the first member and the second member forming the boss are made of resin. As a result, the weight of the boss can be reduced.

10 Foot-operated brake device 12 Support bracket 12R Right side support bracket 12L Left side support bracket 14 Hollow pedal member 16 Pedal arm 18 Pedal tread surface 20 Boss 20R First member 20L Second member 22 Bolt shaft 24 Cylindrical pipe 26 Nut 28 Nut shape 30 Axial direction Moving means 32 Cam surface shapes 33R, 33L Other end side surface 34 Retaining portion 36 Protrusion portion 38 Positioning means 40 Insertion hole 42 Notch protrusion shape 44 Convex shape 46 Recessed shape 48 Booster coupling engagement hole 50 Bush 52 Elliptical shape 54 Insertion hole C Hollow shape K Open form S Space PW Plasma welding

Claims (7)

An elongated pedal arm formed of a steel plate in the form of a hollow, a pedal tread surface provided on one end side of the pedal arm, and a pedal bracket rotatably supported on a support bracket on the other end side of the pedal arm. A hollow pedal member having a cylindrical boss and
A pair of opposed side surfaces forming a hollow portion where the boss is disposed on the other end side of the pedal arm are formed in parallel, and a cylindrical boss is axially divided into two parts between the opposed side surfaces. The first member and the second member of the boss divided into two parts are provided with an axial direction moving means that moves in the separating direction by the relative rotation of both members. A hollow pedal member in which the boss is integrally fixed to the pedal arm by moving the member in the separating direction. The hollow pedal member according to claim 1, wherein
An insertion hole for inserting the first member and the second member of the two-divided boss into the hollow space is formed on the opposite side surface of the pedal arm where the boss is disposed. On the other hand, after the both members are inserted into the first member and the second member of the boss, the relative positional relationship with respect to the facing side surface is also changed with the relative rotation of the both members to engage with the facing side surface. A hollow pedal member in which a retaining portion capable of preventing retaining is formed, and the insertion hole is formed in a shape into which the retaining portion can also be inserted. The hollow pedal member according to claim 1 or 2, wherein
The axial moving means is a hollow pedal member having a cam surface shape capable of axially displacing the two members formed between the first member and the second member of the boss divided into two. The hollow pedal member according to claim 3,
A hollow pedal member, wherein the cam surface shape is provided with positioning means by concave and convex engagement at a predetermined relative rotational position of the first member and the second member. The hollow pedal member according to any one of claims 1 to 4,
A hollow pedal member having a cylindrical pipe penetrating through the first member and the second member of the boss divided into two. The hollow pedal member according to any one of claims 1 to 5, wherein
A hollow pedal member in which a nut shape is formed at an end portion of the first member and the second member forming the boss, the end portion protruding from the pedal arm. The hollow pedal member according to any one of claims 1 to 6,
A hollow pedal member in which the first member and the second member forming the boss are both made of resin.

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