JP2016053393A - Bearing portion structure and flanged bush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent slipping off of a pair of flanged bushes disposed between a supporting member and a boss in a process of assembling work.SOLUTION: Locking claws 50 disposed on tips of both cylindrical portions 46 are locked in locking grooves 52 formed on tips of cylindrical portions 46 respectively at mating sides by relative rotation around a central line O, of a pair of flanged bushes 42 and 44 inserted into through holes of a boss 40, thus separation of the pair of flanged bushes 42 and 44 in the axial direction is prevented, and slipping-off of the flanged bushes 42 and 44 can be prevented in combination with engagement of flange portions 48 with the end portion of the boss 40. Thus the assembling work can be simplified, productivity can be improved, and degradation of quality caused by falling can be prevented.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a bearing portion structure, and more particularly to improvement of a bush with a hook disposed between a support member and a boss.

  A pair of hooked bushes each having a flange provided at one end of the cylindrical portion are disposed on the outer peripheral side of the support member having the cylindrical outer peripheral surface in an attitude facing each other, and the rotating member is interposed via the pair of hooked bushes. There is known a bearing structure in which a boss is supported so as to be rotatable about an axis. The bearing part structure described in Patent Document 1 is an example, and relates to a bearing part structure of a vehicle pedal.

JP-A-5-338519

  However, in such a conventional bearing portion structure, for example, with a pair of hooked bushes arranged on the boss, a support member is inserted into the through hole of the pair of hooked bushes, or a support member is inserted. When it is later assembled to a pedal bracket or the like, the bushed bush may come off, and workability may be poor and productivity may be reduced, or quality may be deteriorated due to dropping. In such a bearing part structure, a predetermined play (gap) is generally provided in the radial direction in consideration of a dimensional error due to processing variation of each part. There is a possibility of falling out in the process.

  The present invention has been made against the background of the above circumstances, and its object is to prevent the pair of hooked bushes disposed between the support member and the boss from falling off during the assembly work. There is to do.

  In order to achieve such an object, according to the first aspect of the present invention, a pair of hooked bushes each having a flange portion provided at one end portion of the cylindrical portion are arranged on the outer peripheral side of a support member having a cylindrical outer peripheral surface. In the bearing portion structure in which the boss of the rotating member is supported to be rotatable about the axis through the pair of flanged bushes, (a) the cylindrical portion of any one of the pair of flanged bushes A locking claw extending in the circumferential direction is provided at the tip, and (b) the tip of the other cylindrical portion of the pair of hooked bushes is around the center line O with respect to the one hooked bush. (C) the locking claws are locked in the locking grooves, thereby providing a pair of hooks. It is characterized in that the attached bushes are prevented from being separated axially from each other. .

  According to a second aspect of the present invention, in the bearing portion structure according to the first aspect, (a) the pair of hooked bushes each include the locking claw and the locking groove, and have the same shape as each other. (B) The locking claw has an L-shape protruding in the axial direction and extending in the circumferential direction, and an inner groove portion of the L-shape functions as the locking groove. .

According to a third aspect of the present invention, in the bearing portion structure according to the first or second aspect of the invention, (a) in the state where the locking claw is in contact with the end surface of the cylindrical portion of the other hooked bush, The pair of hooked bushes are rotated relative to each other around the center line O in order to engage with the engaging groove, so that a space is formed on the rear side of the engaging claw around the center line O as an oil reservoir. (B) The cylindrical portion of the pair of flanged bushes is provided with a slit in the axial direction so as to communicate with the space.
The space is a substantially closed space formed by a pair of hooked bushes between the outer peripheral surface of the support member and the inner peripheral surface of the boss in the assembled state.

  According to a fourth aspect of the present invention, in the bearing portion structure according to any one of the first to third aspects, a notch is provided on an outer peripheral edge of the flange portion of the bush with a flange.

  According to a fifth aspect of the present invention, in the bearing structure according to any one of the first to fourth aspects, the pair of hooked bushes are relatively rotated around a center line O in the locking claw and the locking groove. A stopper claw that is locked to each other so as to prevent relative rotation in the opposite direction when locked to each other is provided.

  The sixth invention relates to a bush with a hook, and is a bush with a hook used in the bearing structure of any one of the first to fifth inventions.

  In such a bearing portion structure, when the pair of hooked bushes are relatively rotated around the center line O, the locking claw provided at the tip of the cylindrical portion of one hooked bushing is Locked in the locking groove provided at the tip of the cylindrical part of the bush, and the pair of hooked bushes are prevented from being separated from each other in the axial direction, so these hook parts engage with the end of the boss. Combined with being made to prevent the hooked bush from coming off. As a result, the assembling work is facilitated, the productivity is improved, and quality deterioration due to dropping is improved.

  In the second invention, each of the pair of bushed bushes has a locking claw and a locking groove and has the same shape. Therefore, it is not necessary to distinguish between the two, and handling is easy and productivity is further improved.

  In the third invention, a pair of hooked bushes are relatively rotated around the center line O in order to lock the locking claws in the locking grooves, thereby forming a space on the rear side of the locking claws. The space can be used as an oil reservoir or a grease reservoir. In addition, since the cylindrical portion of the bush with a bush is provided with a slit in the axial direction so as to communicate with the space, the bearing sliding portion on the inner peripheral side and / or the outer peripheral side of the cylindrical portion is provided with oil or grease. Can be properly lubricated.

  In the fourth aspect of the invention, since the notch is provided in the outer peripheral edge of the flange portion of the flanged bush, when the pair of flanged bushes are relatively rotated around the center line O and the locking claws are locked in the locking grooves. In addition, the notch functions as a non-slip, and the relative rotation is facilitated, and the productivity is further improved.

  In the fifth invention, when the pair of hooked bushes are relatively rotated around the center line O and the locking claws are locked in the locking grooves, the bushes are locked to each other so as to prevent relative rotation in the reverse direction. Since the stopper claw is provided, the locking state between the locking claw and the locking groove is appropriately maintained, and the fall off of the bush with a hook is further appropriately prevented.

  The sixth invention relates to a bush with a flange used in the bearing structure of the first to fifth inventions, and substantially the same operational effects as the first to fifth inventions can be obtained.

1 is a left side view illustrating a schematic configuration of a brake pedal device to which the present invention is applied. FIG. 2 is an enlarged cross-sectional view taken along a line II-II in FIG. 1, that is, a bearing portion of a brake pedal. FIG. 3 is a side view of a pair of hooked bushes used in the bearing portion of FIG. 2 as viewed from a direction perpendicular to the center line O. It is a perspective view which shows the bush with a hook of the left side of FIG. 3 independently. FIG. 5 is a three-side view of the bush with bushing of FIG. 4. FIG. 2 is a cross-sectional view illustrating a procedure for assembling a pair of hooked bushes to a boss in the embodiment of FIG. 1. It is the perspective view which abbreviate | omitted the boss | hub in the bush insertion process of (a) of FIG. It is the perspective view which abbreviate | omitted the boss | hub in the bush rotation process of (b) of FIG. It is a figure explaining the other Example of this invention, and is sectional drawing corresponding to FIG.

  The present invention is preferably applied to a bearing structure of a support portion of a vehicle pedal such as a brake pedal, a clutch pedal, an accelerator pedal, etc., but in a vehicle pedal device that outputs a pedal operating force via an intermediate lever, It can also be applied to the bearing structure of the intermediate lever. These vehicle pedals and intermediate levers correspond to rotating members in which bosses are integrally provided. The boss is a cylindrical member that is integrally fixed to a bearing portion of a vehicle pedal or an intermediate lever. It is also possible to apply to a bearing part structure of a rotating member other than the vehicle pedal device.

  The support member is integrally disposed substantially horizontally, for example, on a pedal bracket. For example, the pedal bracket includes a pair of support plates that are substantially parallel to each other, and both end portions of the support member are integrally fixed to the pair of support plates. The pair of support plates are constituted by a pair of side plates that are substantially parallel to each other, for example, of pedal brackets having a U-shaped cross section, but may be constituted separately. The support member is, for example, a cylindrical collar, and is disposed in a state in which both ends in the axial direction thereof are in contact with the inner side surfaces of the pair of support plates substantially perpendicularly, and a pair of fastening members is inserted through the interior of the collar. A stepped cylindrical support member (such as a stepped bolt) that regulates the distance between a pair of support plates is adopted, with the stepped portion being in contact with the support plate. You can also.

  The bush with a flange is provided with a flange portion having a disk shape or the like that extends substantially perpendicularly to one end of a cylindrical portion, and is integrally formed of a resin material or a metal material having a predetermined elasticity. The cylindrical portion is assembled so as to be inserted into the through hole of the boss until the collar portion substantially comes into contact with the end portion of the boss. For example, the cylindrical portion of the bushed bush is inserted with a predetermined play in the through hole of the boss, and a predetermined play is also provided between the cylindrical outer peripheral surface of the support member and the cylindrical portion as necessary. It is done.

  In the second invention, the pair of hooked bushes have the same shape, and each has an L-shaped locking claw protruding in the axial direction and extending in the circumferential direction, and the groove portion on the inner side of the L-shape. Is used as the locking groove, however, when the first invention is implemented, the pair of hooked bushes may include locking claws or locking grooves having different shapes. Various modes are possible, such as a locking claw (screw thread) and a locking groove (thread groove) that are screwed together like a screw. For example, a plurality of the locking claws are provided at equiangular intervals around the center line O, but only one may be used.

  In the third invention, the locking claw is relatively rotated in a state of being brought into contact with the end surface of the cylindrical portion of the other hooked bush, so that, for example, a substantially rectangular or parallelogram is closed on the rear side of the locking claw. However, in other embodiments of the present invention, it is not always necessary to bring the locking claw into contact with the cylindrical portion of the other hooked bush, and the slit communicating with the space may be omitted. Instead of the slit, a groove may be provided on the inner peripheral surface and / or the outer peripheral surface of the cylindrical portion. The slit may be parallel to the center line O, but may be twisted or inclined around the center line O. Moreover, although a slit can also be provided so that it may open to the edge part by the side of a collar, you may stop in the middle of an axial direction. When a plurality of locking claws are provided around the center line O, a plurality of spaces are formed corresponding to the locking claws, and a plurality of slits can be provided corresponding to the plurality of spaces. Only one slit may be provided regardless of the number.

  In the fourth invention, a notch is provided in the outer peripheral edge of the flange portion of the bush with a flange, but the cutout may be omitted when implementing other inventions. The cutout can have various forms such as a V-shaped, quadrangular, or semicircular cross section. For example, a large number (three or more) of notches are preferably provided around the center line O at equal angular intervals.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified for explanation, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

  FIG. 1 is a left side view showing a brake pedal device 10 for a service brake of a vehicle to which the present invention is applied, and FIG. 2 is an enlarged sectional view taken along the line II-II in FIG. The brake pedal device 10 includes a brake pedal 12, and the brake pedal 12 is supported by a pedal bracket 14 so as to be rotatable about a substantially horizontal support axis S1 at an upper end portion. A step portion 16 such as a pedal seat is integrally attached to the lower end portion. When the stepping portion 16 is depressed by the driver, the brake pedal 12 is rotated clockwise around the support axis S1 in FIG. 1, and a push rod (not shown) is connected via the connecting link 17 and the intermediate lever 18. 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 18 is disposed on the pedal bracket 14 so as to be rotatable around a support axis S2 substantially parallel to the support axis S1. The brake pedal device 10 corresponds to a vehicle pedal device, and the brake pedal 12 is a vehicle pedal and corresponds to a rotating member.

  The pedal bracket 14 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 20 and 22 are integrally provided. The brake pedal 12 is supported between the pair of support plates 20 and 22. The pair of support plates 20 and 22 are provided with insertion holes 24 at positions substantially coinciding with the support axis S 1, and a cylindrical collar 26 is disposed between the support plates 20 and 22. It is made to contact | abut to the inner surface which the support plates 20 and 22 mutually oppose substantially perpendicularly. Then, the fastening bolt 28 is inserted through the insertion hole 24 of the pair of support plates 20 and 22 and the through hole of the collar 26, and the nut 30 is screwed to the tip portion protruding from the support plate 20, whereby a pair of support is supported. A collar 26 is integrally fixed between the plates 20 and 22 in a state of being clamped in the axial direction. The collar 26 corresponds to a support member having a cylindrical outer peripheral surface, and the axis of the collar 26 is a support axis S <b> 1 and substantially coincides with the center line of the insertion hole 24.

  On the other hand, a cylindrical boss 40 having a diameter larger than that of the collar 26 is integrally fixed to the upper end of the brake pedal 12 by welding or the like. A bushing 42, 44 is provided. The bushed bushes 42 and 44 have the same shape and are integrally formed of a synthetic resin material, and have a cylindrical portion 46, and a large diameter that extends substantially perpendicularly to one end of the cylindrical portion 46 toward the outer peripheral side. The disc-shaped collar portion 48 is integrally provided. When the cylindrical portion 46 is inserted into the through hole of the boss 40 with play, the pair of hooked bushes 42 and 44 are assembled to both end portions of the boss 40, respectively, and the inside of the cylindrical portion 46 is disposed inside the cylindrical portion 46. The collar 26 is inserted so as to be relatively rotatable. As a result, the boss 40 is supported by the collar 26 so as to be rotatable around the support axis S1 via the pair of flanged bushes 42, 44, and via the flange portions 48 of the pair of flanged bushes 42, 44. The axial position of the boss 40 is positioned by the pair of support plates 20 and 22.

  3 is a side view of the pair of hooked bushes 42 and 44 used in the bearing portion of FIG. 2 as viewed from the direction perpendicular to the center line O, and FIG. 4 is a perspective view showing one hooked bush 42 alone. FIG. 5 and FIG. 5 are three views of the bushed bush 42. 5A is a plan view seen from the cylindrical portion 46 side, FIG. 5B is a side view seen from below (a), and FIG. 5C is a side view seen from the right side of FIG. Corresponds to 3. As is apparent from these drawings, a pair of locking claws 50 are provided at the tip of the cylindrical portion 46 of the flanged bush 42 in a symmetrical position with respect to the center line O. The locking claw 50 has an L-shape protruding in the axial direction from the end surface 53 of the cylindrical portion 46 and extending in the circumferential direction, and the groove portion inside the L-shape functions as a locking groove 52. The locking claw 50 of the other hooked bush 44 is locked. The end face 53 is provided at a substantially right angle to the center line O, and the pair of locking claws 50 extend in the same direction around the center line O, specifically, in the counterclockwise direction when viewed from the flange portion 48 side. It is provided as follows.

  FIG. 6 (a) shows a state in which the pair of hooked bushes 42 and 44 face each other, and the locking claws 50 are inserted into the through holes of the boss 40 with a phase shifted around the center line O so that they are staggered. It is the state that was done. The pair of locking claws 50 are provided around the center line O at a predetermined interval, and the mating locking claw 50 can be inserted between the pair of locking claws 50. Each is brought into substantially contact with the end face 53 of the counterpart cylindrical portion 46. Then, in this state, as shown in (b), when it is relatively rotated around the center line O, both the locking claws 50 are respectively fitted in the other-side locking grooves 52, and the relative movement in the axial direction is prevented. And are integrally coupled. Although the locking claw 50 and the locking groove 52 may have play, in this embodiment, the locking claw 50 and the locking groove 52 are tightly fitted and held in a coupled state. This tight fitting is a tight allowance that can be manually fitted by an operator. 7 and 8 are views corresponding to (a) and (b) of FIG. 6, respectively, and are perspective views in which the boss 40 is omitted. By combining the pair of hooked bushes 42 and 44 in this way, the hook parts 48 are brought into contact with the end of the boss 40, and the hooked bushes 42 and 44 in the process of assembling are combined. 44 is prevented from falling off the boss 40. Thereby, after that, the collar 26 can be inserted into the through holes of the bushed bushes 42 and 44 and assembled to the pedal bracket 14 easily.

  As shown in FIG. 6 (b) and FIG. 8, when the pair of hooked bushes 42 and 44 are coupled, the rear end of the locking claw 50 around the center line O as apparent from the side view of FIG. A substantially parallelogram space 54 is formed on the side. The space 54 is formed in a substantially sealed state between the outer peripheral surface of the collar 26 and the inner peripheral surface of the boss 40 and can be used as an oil reservoir or a grease reservoir. A slit 56 is provided in the axial direction on the rear side of the locking claw 50 around the center line O so as to communicate with the space 54, and oil or grease in the space 54 extends in the axial direction along the slit 56. By flowing, the bearing sliding portion on the inner peripheral side and / or outer peripheral side of the cylindrical portion 46 is appropriately lubricated with oil or grease. The slit 56 is provided in a direction inclined with respect to the center line O along the inclination of the rear portion side of the locking claw 50 or twisted around the center line O, and reaches the end portion on the flange portion 48 side. Thus, the sliding portion of the collar portion 48 is appropriately lubricated. Only one slit 56 is provided on the rear side of one of the pair of locking claws 50. In addition, a large number of notches 58 are provided on the outer peripheral edge of the flange portion 48, respectively, and function as a slip stopper when the bushed bushes 42 and 44 are coupled by rotating relative to each other. In this embodiment, the notch 58 has a quadrangular cross section and is provided around the center line O at approximately equal angular intervals.

  In such a bearing structure of the brake pedal 12 of this embodiment, the pair of flanged bushes 42 and 44 inserted into the through holes of the boss 40 are rotated relative to each other around the center line O, whereby both cylinders are formed. A locking claw 50 provided at the tip of the portion 46 is locked in a locking groove 52 provided at the tip of the opposite cylindrical portion 46, and the pair of hooked bushes 42, 44 are separated from each other in the axial direction. Therefore, the hooked bushes 42 and 44 are prevented from falling off in combination with the engagement of the flange portions 48 with the end portions of the bosses 40. As a result, the assembling work is facilitated, the productivity is improved, and quality deterioration due to dropping is improved. In particular, in this embodiment, the locking claw 50 is tightly fitted into the locking groove 52 and integrally coupled, so that the boss 40 can be prevented from coming off properly.

  Further, since the pair of hooked bushes 42 and 44 are both provided with the locking claw 50 and the locking groove 52 and have the same shape, it is not necessary to distinguish between them, and the handling is easy and the productivity is further improved. .

  Further, in order to lock the locking claw 50 in the locking groove 52, the pair of hooked bushes 42, 44 are center lines in a state where the locking claw 50 is substantially in contact with the end surface 53 of the counterpart cylindrical portion 46. By being relatively rotated around O, a substantially closed space 54 is formed on the rear side of the locking claw 50, and the space 54 can be used as an oil reservoir or a grease reservoir. Since the cylindrical portion 46 of the bushed bushes 42 and 44 is provided with a slit 56 in the axial direction so as to communicate with the space 54, bearing sliding on the inner peripheral side and / or outer peripheral side of the cylindrical portion 46 is possible. The part can be properly lubricated with oil or grease. In the present embodiment, since the slit 56 reaches the flange portion 48, the sliding portion of the flange portion 48 is also appropriately lubricated.

  In addition, since a large number of notches 58 are provided on the outer peripheral edge of the flange portion 48 of the flanged bushes 42 and 44, the pair of flanged bushes 42 and 44 are relatively rotated around the center line O so that the locking claws 50 are moved. When the locking groove 52 is locked, the notch 58 functions as a non-slip, and the relative rotation is facilitated to further improve the productivity.

  Although illustration and detailed description are omitted, in this embodiment, the bearing portion structure in which the intermediate lever 18 is attached to the pedal bracket 14 so as to be rotatable around the support axis S2 is also the same as the bearing portion structure of the brake pedal 12 described above. It is constituted similarly.

  Next, another embodiment of the present invention will be described. In the following embodiments, parts that are substantially the same as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 9 is a cross-sectional view corresponding to FIG. 6. In the L-shaped locking claw 50, the groove width of the groove portion (locking groove 52) decreases from the distal end toward the proximal end in the circumferential direction. A stopper claw 60 is provided to protrude to the front. Then, when the pair of hooked bushes 42 and 44 are rotated relative to each other around the center line O and the locking claws 50 are inserted into the locking grooves 52 on the other side and locked together, (b) As shown, when the stopper claws 60 are engaged with each other, the locking claws 50 are elastically deformed. When the stopper claws 60 are further rotated and the stopper claws 60 get over each other as shown in (c), the stopper claws 60 are locked so that they cannot rotate in the reverse rotation direction. As a result, relative rotation in the reverse direction around the center line O is prevented, and the locking state between the locking claw 50 and the locking groove 52 is appropriately maintained, and the hooked bushes 42 and 44 are prevented from falling off. More appropriately prevented.

  As mentioned above, although the Example of this invention was described in detail based on drawing, these are one embodiment to the last, and this invention is implemented in the aspect which added the various change and improvement based on the knowledge of those skilled in the art. be able to.

  12: Brake pedal (turning member) 18: Turning lever (turning member) 26: Collar (supporting member) 40: Boss 42, 44: Bush with hook 46: Cylindrical portion 48: Hook 50: Locking claw 52 : Stop groove 53: End face 54: Space 56: Slit 58: Notch 60: Stopper claw S1, S2: Support axis O: Bush centerline

Claims (6)

A pair of hooked bushes each provided with a flange on one end of the cylindrical portion are disposed on the outer peripheral side of the support member having the cylindrical outer peripheral surface in a posture facing each other, and the rotating member is interposed via the pair of hooked bushes. In the bearing part structure in which the boss of
One end of the cylindrical portion of the pair of hooked bushes is provided with a locking claw extending in the circumferential direction,
A locking groove in which the locking claw is locked at the tip of the other cylindrical portion of the pair of hooked bushes by being relatively rotated around a center line O with respect to the one hooked bush. Is provided,
The bearing portion structure, wherein the pair of hooked bushes are prevented from being separated from each other in the axial direction by the locking claw being locked in the locking groove. Each of the pair of bushed bushes includes the locking claw and the locking groove, and has the same shape as each other.
The locking claw has an L shape that protrudes in the axial direction and extends in the circumferential direction, and an inner groove portion of the L shape functions as the locking groove. The bearing structure described. The pair of hooked bushes around the center line O in order to lock the locking claws in the locking groove in a state where the locking claws are in contact with the end surface of the cylindrical portion of the other hooked bush. By being relatively rotated, a space is formed on the rear side of the locking claw around the center line O and can be used as an oil reservoir,
The bearing part structure according to claim 1 or 2, wherein a slit is provided in the cylindrical part of the pair of flanged bushes in an axial direction so as to communicate with the space. The notch is provided in the outer periphery of the said collar part of the said bush with a flange. The bearing part structure of any one of Claims 1-3 characterized by the above-mentioned. When the pair of hooked bushes are relatively rotated around the center line O and locked to each other, the locking claws and the locking groove are locked to each other so as to prevent relative rotation in the reverse direction. The bearing part structure according to any one of claims 1 to 4, wherein a stopper claw is provided.   A bush with a hook used in the bearing part structure according to any one of claims 1 to 5.