JP2018067073A - Bush and pedal apparatus for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bush and a pedal apparatus for vehicles that suppress backlashes and improve assembling properties as well.SOLUTION: Resin bushes 41 and 43 comprise: a circular ring part 45; a brim part 47 that has the same axis as the circular ring part 45 and is larger than the circular ring part 45 in diameter; and a joint part 49 for connecting the circular ring part 45 and the brim part 47. The joint part 49 includes: a slope part 49A that spreads outward in the radial direction from the circular ring part 45 to the brim part 47; and an overhang part 49B that is connected to the brim part 47, bending outward in the radial direction from the slope part 49A.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a bush interposed between a boss and a collar and a vehicle pedal device including the bush.

  Conventionally, various technologies relating to a bush interposed between a boss and a collar and a vehicle pedal device including the bush have been proposed. For example, a bearing bush described in Patent Document 1 below is provided with a hollow main body having an annular curved concave inner surface and a curved convex outer surface, and radially outward from one end of the hollow main body. An annular flange, at least one first slit provided in the hollow body portion extending from one end of the hollow body portion toward the other end of the hollow body portion, and the other end of the hollow body portion At least one second slit provided in the hollow main body portion extending from the end portion toward one end of the hollow main body portion, and annularly communicated with the first slit at one end portion of the hollow main body portion At least one third slit provided in the flange part and the outer side of the annular flange part radially outward from the other end part of the hollow body part toward the one end part of the hollow body part And at least one inclined plate portion extending to Empty body portion is freely contracted by the first third slit.

  According to such a bearing bush, at least one first slit provided in the hollow body portion extending from one end portion of the hollow body portion toward the other end portion of the hollow body portion, At least one second slit provided in the hollow body portion extending from the other end portion toward one end of the hollow body portion, and communicating with the first slit at one end portion of the hollow body portion Since the hollow main body can be reduced in diameter by at least one third slit provided in the annular flange, it is determined by the dimensional tolerance between the inner diameter of the hollow main body and the outer diameter of the shaft member. The bearing clearance (backlash) can be absorbed, the operational feeling can be prevented from lowering due to radial backlash due to the bearing clearance and abnormal noise can be prevented, and it has been extended radially outward from the outer periphery of the annular flange. At least one inclined plate is hollow Since it is inclined in the direction from the other end of the part toward the one end of the hollow body part, the axial gap can be absorbed by the elastic deformation of the inclined plate part, and the operation by increasing the sliding resistance It is possible to prevent the generation of abnormal noise due to a decrease in feeling and an axial gap (backlash), thus improving the operational feeling.

Japanese Patent Laid-Open No. 2006-56944

  However, at least one inclined plate portion extending radially outward from the outer peripheral edge of the annular flange portion is inclined in a direction from the other end portion of the hollow main body portion toward one end portion of the hollow main body portion. Therefore, when the bearing bush is interposed between the boss and the collar of the vehicular pedal device, the bearing bush expands in the axial direction from both ends of the boss as it proceeds in the radial direction.

  Since the inclined plate portion in such a state is easily caught by the support plate when the boss fixed to the pedal arm is inserted between the pair of support plates, the assembling property is deteriorated.

  Therefore, the present invention has been made in view of the above-described points, and it is an object of the present invention to provide a bush and a vehicle pedal device that are capable of suppressing looseness and simultaneously improving assembly.

  In order to solve this problem, the invention according to claim 1 is a resin-made bush interposed between a boss provided on a pedal of a vehicle pedal device and a collar fitted in the boss. And an annular portion, a collar portion provided coaxially with the annular portion, an outer peripheral edge having a larger diameter than the annular portion, and a connecting portion that connects the annular portion and the flange portion, An inclined portion that spreads radially outward from the annular portion toward the flange portion, and a projecting portion that is bent from the inclined portion to the radially outer side and is continuously connected to the flange portion. Features.

  The invention according to claim 2 is the bush according to claim 1, wherein the flange portion is a wide annular plate whose inner peripheral edge has the same diameter as the annular portion, and is circular along the axis of the annular portion. A curved surface portion that extends from the ring portion and that is continuously provided on the inner peripheral edge of the collar portion is provided.

  Invention of Claim 3 is a bush of Claim 1 or Claim 2, Comprising: It is provided with the protrusion part which bent and protruded toward the ring-shaped part side in the protrusion part of a connection part. Features.

  A fourth aspect of the present invention is the bush according to any one of the first to third aspects, wherein the connecting portions are arranged at an equal pitch in the circumferential direction of the annular portion. And

  The invention according to claim 5 is the vehicle pedal device according to any one of claims 1 to 4.

  In the bush according to the first aspect and the vehicle pedal device according to the fifth aspect, the inclined portion of the connecting portion spreads outward in the radial direction from the annular portion toward the flange portion. For this reason, when a bush is interposed between the boss and the collar of the pedal device for a vehicle, the inclined portion of the connecting portion is pressed against the inner wall surface of the boss on the flange side, so the elasticity of the inclined portion in the radial direction The force works to suppress the radial play, which in turn prevents an uncomfortable feeling during pedal operation. Furthermore, since a part of the inclined portion of the connecting portion protrudes between the boss and the collar, the protruding portion and the flange portion of the connecting portion are in a state along the end wall surface of the boss. It becomes difficult to catch the buttocks and the assembling property is improved. Therefore, the bush according to claim 1 and the vehicle pedal device according to claim 5 can improve assembling performance at the same time as suppressing play.

  In the bush according to claim 2 and the vehicle pedal device according to claim 5, when the bush is interposed between the boss and the collar of the vehicle pedal device, the curved surface extends from the annular portion and is connected to the collar portion. Since the portion is interposed between the boss and the collar, the strength of the bush in the axial direction, and thus the durability of the bush during pedal operation is improved.

  In the bush according to claim 3 and the vehicle pedal device according to claim 5, when the bush is interposed between the boss and the collar of the vehicle pedal device, the protrusion provided on the protruding portion of the connecting portion is the boss. Since the elastic force of the protruding portion in the axial direction of the bush acts, the backlash in the axial direction of the bush is suppressed, thereby preventing a sense of incongruity during pedal operation.

  In the bush according to claim 4 and the vehicle pedal device according to claim 5, the connecting portions are arranged at an equal pitch in the circumferential direction of the annular portion, and the bush is interposed between the boss and the collar of the vehicle pedal device. When interposing, the directionality of the bush is lost in the radial direction and the circumferential direction, so that the assembling property is further improved.

It is a side view showing the brake pedal device of this embodiment. It is an expanded sectional view of the AA arrow part in FIG. It is a perspective view showing the bush of this embodiment. It is a figure showing the bush, Comprising: (a) is a top view, (b) is a front view, (c) is sectional drawing of the BB arrow part in the same (a). FIG. 5A is a schematic diagram showing the state of the bush assembled to the brake pedal device as indicated by arrows BB in FIG. 4A, wherein FIG. 4A is a diagram before assembly, and FIG. (C) is a view after assembly.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a bush according to the present invention and a vehicle pedal device including the bush will be described with reference to the drawings, based on the specific embodiment. In addition, regarding the bush and the vehicular pedal device, detailed descriptions of known techniques other than matters specifying the present invention may be omitted. Moreover, in each drawing used for the following description, a part of the basic configuration may be omitted, and the dimensional ratio of each drawn part is not necessarily accurate.

[1. Outline of Bush and Brake Pedal Device]
As shown in FIGS. 1 and 2, the brake pedal device 11 includes a brake pedal 13, and the brake pedal 13 is supported by a pedal bracket 15 so as to be rotatable around a substantially horizontal support axis S <b> 1 at an upper end portion. In addition, a stepped portion 17 such as a pedal seat is integrally attached to the lower end portion of the brake pedal 13. When the stepping portion 17 is depressed by the driver, the brake pedal 13 is rotated clockwise around the support axis S1 in FIG. 1 and a push rod (not shown) is connected via the connecting link 19 and the intermediate lever 21. The stepping operation force is transmitted to an output member such as a brake hydraulic pressure is generated according to the stepping operation force. The intermediate lever 21 is disposed on the pedal bracket 15 so as to be rotatable around a support axis S2 substantially parallel to the support axis S1.

  The pedal bracket 15 has a U-shape that is turned on the front side of the vehicle in a plan view as viewed from above in FIG. 1, and is formed of side plates that are substantially parallel to each other and are provided at a predetermined interval. A pair of support plates 23 and 25 are integrally provided. The brake pedal 13 is supported between the pair of support plates 23 and 25. The pair of support plates 23, 25 are provided with insertion holes 27 at positions substantially coincident with the support axis S1, and a cylindrical collar 29 is arranged between the support plates 23, 25. It is made to contact | abut to the inner surface which the support plates 23 and 25 mutually oppose substantially perpendicularly. Then, the fastening bolt 31 is inserted through the insertion hole 27 of the pair of support plates 23 and 25 and the through hole of the collar 29, and the nut 33 is screwed to the tip portion protruding from the support plate 25, whereby the pair of support plates A collar 29 is integrally fixed between the plates 23 and 25 while being pressed in the axial direction. The collar 29 has a cylindrical outer peripheral surface, and the axis of the collar 29 is the support axis S1 and substantially coincides with the center line of the insertion hole 27.

  On the other hand, a cylindrical boss 35 having a diameter larger than that of the collar 29 is integrally fixed to the upper end portion of the brake pedal 13 by welding or the like. Bushings 41 and 43 are provided. The bushes 41 and 43 have the same shape and are each integrally formed of a synthetic resin material. The bushes 41 and 43 have an annular part 45, and a flange part extending substantially perpendicularly to one end of the annular part 45. 47 is provided integrally. A connecting portion 49 is provided between the annular portion 45 and the flange portion 47. Then, the annular portion 45, the connecting portion 49, and the like are press-fitted into the through hole of the boss 35, whereby the pair of bushes 41 and 43 are integrally assembled to both end portions of the boss 35, respectively. The collar 29 is inserted into the connecting portion 49 so as to be relatively rotatable. Accordingly, the boss 35 is supported by the collar 29 so as to be rotatable around the support axis S <b> 1 via the pair of bushes 41, 43, and the pair of support plates is provided via the flanges 47 of the pair of bushes 41, 43. 23 and 25 position the boss 35 in the axial direction.

[2. Bush structure]
Next, the structure of the bushes 41 and 43 will be described. As illustrated in FIGS. 3 and 4, the bushes 41 and 43 include an annular portion 45, a flange portion 47, a connecting portion 49, and a curved surface portion 51. The thicknesses of the annular portion 45, the flange portion 47, the connecting portion 49, and the curved surface portion 51 are substantially the same.

  The inner diameter of the annular portion 45 is slightly smaller than the outer diameter of the collar 29, and the outer diameter of the annular portion 45 is slightly smaller than the inner diameter of the boss 35.

  The flange portion 47 is a wide annular plate that is coaxial with the axis SA of the annular portion 45. A connecting portion 49 or a curved surface portion 51 is provided between the flange portion 47 and the annular portion 45. That is, the flange portion 47 is provided away from the annular portion 45 in the direction of the axis SA of the annular portion 45. The outer peripheral edge 47 </ b> A of the flange portion 47 has a diameter larger than the outer diameter of the annular portion 45. The inner peripheral edge 47 </ b> B of the flange portion 47 has the same diameter as the outer diameter of the annular portion 45.

  The connecting portion 49 connects the annular portion 45 and the flange portion 47. Six connecting portions 49 are provided at equal pitches in the circumferential direction of the annular portion 45 and the flange portion 47. In the connecting portion 49, slit-shaped openings are provided on both sides of the annular portion 45 and the flange portion 47 in the circumferential direction. Accordingly, the connecting portion 49 is provided away from the curved surface portion 51 or the flange portion 47 in the circumferential direction of the annular portion 45 and the flange portion 47. The connecting portion 49 includes an inclined portion 49A, a protruding portion 49B, and a protruding portion 49C.

  The inclined portion 49A is inclined so as to spread outward in the radial direction of the annular portion 45 and the flange portion 47 from the annular portion 45 toward the inner peripheral edge 47B of the flange portion 47. Thereby, the distance from the axis SA of the annular portion 45 to the outer wall surface of the inclined portion 49A (hereinafter referred to as “same distance”) is larger than the outer diameter of the annular portion 45, and further, As it goes toward the inner peripheral edge 47B of the portion 47, it gradually increases. The distance is slightly larger than the inner diameter of the boss 35 between the vicinity of the flange 47 and the inner peripheral edge 47B of the flange 47.

  The projecting portion 49 </ b> B is provided in a state where one end thereof is bent from the inclined portion 49 </ b> A to the outer side in the radial direction of the annular portion 45 and the flange portion 47 in the vicinity of the inner peripheral edge 47 </ b> B of the flange portion 47. Further, the projecting portion 49B is provided in a state where the other end opposite to the one end is connected to the flange 47. The protruding portion 49B is provided with a protruding portion 49C that is bent and protrudes from the flange portion 47 side toward the annular portion 45 side.

  The curved surface portion 51 is a curved plate extending from the annular portion 45 along the axis SA of the annular portion 45, and is provided in a state of being connected to the inner peripheral edge 47 </ b> B of the flange portion 47. As described above, the outer diameter of the inner peripheral edge 47B of the collar portion 47 is the same as the outer diameter of the annular portion 45. Accordingly, the distance from the axis SA of the annular portion 45 to the outer wall surface of the curved surface portion 51 is the same as the distance from the axis SA of the annular portion 45 to the outer wall surface of the annular portion 45. Thereby, the curved surface part 51 and the annular part 45 form one cylindrical body. The curved surface portion 51 is formed between the two connecting portions 49. Therefore, six curved surface portions 51 are provided at an equal pitch in the circumferential direction of the annular portion 45 and the flange portion 47.

  The bushes 41 and 43 can be elastically deformed by the synthetic resin material. Furthermore, with the structure described above, the connecting portion 49 is more easily elastically deformed than the annular portion 45, the flange portion 47, and the curved surface portion 51. In FIG. 4C, only the cross sections of the annular portion 45, the flange portion 47, and the connecting portion 49 are illustrated.

[3. Bush action]
Next, the operation of the bushes 41 and 43 will be described. As shown in FIGS. 5A and 5B, when the bushes 41 and 43 are interposed between the collar 29 and the boss 35, a part 49D (lower end portion in FIG. 5) of the inclined portion 49A of the connecting portion 49 is the collar. 29 and the boss 35 are protruded. Although not shown in FIG. 5, in the curved surface portion 51 provided between the annular portion 45 and the inner peripheral edge 47 </ b> B of the flange portion 47, the bushes 41 and 43 are interposed between the collar 29 and the boss 35. Accordingly, it is interposed between the collar 29 and the boss 35. Further, due to the dimensional relationship between the annular portion 45 and the collar 29, the inner wall surface of the annular portion 45 is pressed against the outer wall surface of the collar 29 by its elastic force.

  At the same time, due to the dimensional relationship between the inclined portion 49A of the connecting portion 49 and the boss 35, the inclined portion 49A of the connecting portion 49 becomes closer to the flange 47 side by the elastic force in the radial direction of the annular portion 45 and the flange portion 47. It will be in the state pressed against the inner wall surface. That is, the inclined portion 49 </ b> A of the connecting portion 49 has a boss 35 extending inward in the radial direction of the annular portion 45 and the flange portion 47 from a state before the annular portion 45 and the flange portion 47 are expanded outward in the radial direction. It shifts to the state during the assembly pushed by the inner wall surface. Thereby, a portion 49D (lower end portion in FIG. 5) of the inclined portion 49A of the connecting portion 49 moves to the outer wall surface side of the collar 29, and along with this shift, the projecting portion 49B and the flange portion 47 of the connecting portion 49. Is along the end wall surface 35 </ b> A of the boss 35. Therefore, the protrusion 49 </ b> C provided on the protruding portion 49 </ b> B of the connecting portion 49 is in contact with the end wall surface 35 </ b> A of the boss 35.

  After that, as shown in FIG. 5C, when the support plates 23 and 25 are assembled in a state of being substantially perpendicularly contacted with the end wall surface 29 </ b> A of the collar 29, The portion 47 is pressed against the end wall surface 35 </ b> A of the boss 35 by the support plates 23 and 25. Accordingly, the protrusion 49C provided on the protruding portion 49B of the connecting portion 49 is also pressed against the end wall surface 35A of the boss 35 by the support plates 23 and 25. Therefore, the elastic force of the protrusion 49 </ b> C acts on the end wall surface 35 </ b> A of the boss 35 in the direction of the axis SA of the bushes 41 and 43.

  5B and 5C, only one of the cross sections of the bushes 41 and 43 (each of the annular portion 45, the flange portion 47, and the connecting portion 49) is drawn for easy understanding of the drawings. The cross sections of the support plates 23 and 25, the collar 29, and the boss 35 are not shaded.

[4. Others]
Incidentally, in the present embodiment, the brake pedal device 11 is an example of a “vehicle pedal device”.

[5. Summary]
As described in detail above, in the present embodiment, as the inclined portion 49A of the connecting portion 49 moves from the annular portion 45 toward the flange portion 47, the radial direction of the annular portion 45 and the flange portion 47 increases. It spreads outward. Therefore, when the bushes 41 and 43 are interposed between the boss 35 and the collar 29 of the brake pedal device 11, the inclined portion 49 </ b> A of the connecting portion 49 is pressed against the inner wall surface of the boss 35 on the flange portion 47 side. Therefore, since the elastic force of the inclined portion 49A of the connecting portion 49 acts on the inner wall surface of the boss 35 in the radial direction of the annular portion 45 and the flange portion 47, the play in the radial direction of the annular portion 45 and the flange portion 47 is suppressed. Is done. The radial direction of the annular portion 45 and the flange portion 47 is the same as the radial direction of the boss 35 and the collar 29.

  Further, a part 49D (lower end portion in FIG. 5) of the inclined portion 49A of the connecting portion 49 protrudes between the boss 35 and the collar 29, whereby the protruding portion 49B and the flange portion 47 of the connecting portion 49 are It will be in the state along 35 A of end wall surfaces. Therefore, after the bushes 41, 43 are assembled between the boss 35 of the brake pedal 13 and the collar 29, when the boss 35 of the brake pedal 13 is inserted between the support plates 23, 25, Since the protruding portion 49B and the flange portion 47 are not easily caught by the support plates 23 and 25, the assembling property is improved.

  Therefore, in the present embodiment, the bushes 41 and 43 and the brake pedal device 11 can improve the assembling property at the same time as the play is suppressed.

  In the present embodiment, when the bushes 41 and 43 are interposed between the boss 35 and the collar 29 of the brake pedal device 11, the curved surface portion 51 extending from the annular portion 45 and continuing to the flange portion 47 becomes the boss 35 and the collar 29. Intervene between. For this reason, the strength of the bushes 41 and 43 in the direction of the axis SA, and consequently the durability of the bushes 41 and 43 during pedal operation, are improved. Note that the axial direction SA of the bushes 41 and 43 substantially coincides with the axial direction of the boss 35 and the axial direction of the collar 29.

  In the present embodiment, when the bushes 41 and 43 are interposed between the boss 35 and the collar 29 of the brake pedal device 11, the projecting portion 49 </ b> B and the flange portion 47 of the connecting portion 49 are along the end wall surface 35 </ b> A of the boss 35. Furthermore, the protrusion 49C provided on the projecting portion 49B of the connecting portion 49 is in a state of being in contact with the end wall surface 35A of the boss 35. Along with this, the elastic force of the protrusion 49C acts on the end wall surface 35A of the boss 35 in the direction of the axis SA of the bushes 41 and 43, so that the backlash in the direction of the axis SA of the bushes 41 and 43 is suppressed.

  In this manner, the bushes 41 and 43 suppress the play in the radial direction and the play in the axis SA direction. Furthermore, when the stepping portion 17 of the brake pedal 13 is depressed by the driver, the boss 35 fixed to the brake pedal 13 shifts in the radial direction, thereby causing the annular portion 45 and the inclined portion of the connecting portion 49. 49A and each part of the curved surface portion 51 are compressed in the radial direction of the bushes 41 and 43. Accordingly, a portion 49D (lower end portion in FIG. 5) of the inclined portion 49A of the connecting portion 49 is in a state of further protruding from between the boss 35 and the collar 29, that is, in the axis SA direction of the bushes 41 and 43. Furthermore, it will be in the state compressed. In this way, the bushes 41 and 43 at the time of pedal operation link and suppress the backlash in the radial direction and the backlash in the direction of the axis SA to increase the feeling of rigidity. Improve the feeling of pedal operation.

  In the present embodiment, the connecting portions 49 are arranged at an equal pitch in the circumferential direction of the annular portion 45 and the flange portion 47. Therefore, when the bushes 41 and 43 are interposed between the boss 35 and the collar 29 of the brake pedal device 11, the directionality of the bushes 41 and 43 is lost in the radial direction and the circumferential direction, so that the assemblability is further improved. To do.

[6. Example of change]
In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning.
For example, the bushes 41 and 43 are used in the support shaft center S1 of the brake pedal device 11, but may be used in the support shaft center S2.

  In addition, the bushes 41 and 43 are used in the brake pedal device 11, but may be used in a vehicle pedal device such as an accelerator pedal device, for example.

11 Brake pedal device 13 Pedal 29 Collar 35 Boss 41 Bushing 43 Bushing 45 Annular part SA Axis 47 Hook 47A Outer peripheral edge 47B Inner peripheral edge 49 Connecting part 49A Inclined part 49B Protruding part 49C Projecting part 51 Curved part

Claims (5)

A resin-made bush interposed between a boss provided on a pedal of a vehicle pedal device and a collar fitted into the boss,
An annulus,
It is provided coaxially with the annular part, and an outer peripheral edge has a larger diameter than the annular part,
A connecting portion for connecting the annular portion and the flange portion;
The connecting portion is
An inclined part that spreads outward in the radial direction from the annular part toward the flange part;
A bush comprising: a bulge portion bent from the inclined portion to the outer side in the radial direction and connected to the flange portion. The flange portion is a wide annular plate whose inner peripheral edge has the same diameter as the annular portion,
2. The bush according to claim 1, further comprising a curved surface portion that extends from the annular portion along the axis of the annular portion and that is connected to an inner peripheral edge of the flange portion.   3. The bush according to claim 1, wherein the projecting portion of the connecting portion includes a protruding portion that is bent and protrudes toward the ring portion side.   The bush according to any one of claims 1 to 3, wherein the connecting portions are arranged at an equal pitch in a circumferential direction of the annular portion.   The pedal device for vehicles according to any one of claims 1 to 4.

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