JP2005256768A - Muffler support - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a muffler support more surely preventing an attachment pin from coming off without adding new parts. <P>SOLUTION: This rubber muffler support is provided with a first retention part 1 provided on a vehicle body and including a first insertion through hole 1a in which a first attachment pin having a bulge part on a tip is inserted and retained, a second retention part 2 provided on an exhaust pipe and including a second insertion through hole 2a in which a second attachment pin having a bulge part on a tip is inserted and retained and arranged separately from the first retention part 1, and a pair of connection parts 3, 3 connecting the first retention part 1 and the second retention part 2 at both sides thereof. Elastic stoppers 1b, 2b preventing the first and the second attachment pins projecting inward in a radial direction from an inner circumference surface of the first and the second insertion through holes 1a, 2a and formed to intermittently extend in a circumference direction and inserted in and retained by the first and the second insertion through holes 1a, 2a are provided on one of opening end part of the first and the second insertion through holes 1a, 2a of the first and the second retention part 1, 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a muffler support that supports an exhaust pipe mounted on a vehicle on a vehicle body.

  Conventionally, when an exhaust pipe mounted on a vehicle is mounted, the exhaust pipe is vibration-supported and supported by the vehicle body using a muffler support formed of an elastic material such as rubber. As such a muffler support, for example, one shown in FIG. 9 is known. The muffler support includes a first holding part 51 having a first insertion hole 51a, a second holding part 52 having a second insertion hole 52a and spaced from the first holding part 51, and a first holding part. It is comprised from a pair of connection parts 53 and 53 which connect the part 51 and the 2nd holding | maintenance part 52 in the both sides, and the center connection part 54 which connects the center parts of the connection parts 53 and 53. FIG.

  In the muffler support, a first mounting pin (not shown) provided on the vehicle body is inserted and held by press-fitting into the first insertion hole, and a second mounting pin (not shown) provided on the exhaust pipe is the first. It is attached by being inserted and held in the two insertion holes by press fitting. The pair of connecting portions 53 and 53 are mainly elastically deformed to absorb the vibration of the exhaust pipe and prevent the vibration from being transmitted to the vehicle body side.

  By the way, in order to prevent the first and second mounting pins inserted and held in the first and second insertion holes of the muffler support from being easily removed from the first and second insertion holes 51a and 52a, normally, It is set as the structure which has the bulging part which bulges radially outward at the front-end | tip of a part. The first and second insertion holes 51a and 52a are deformed by the weight of the exhaust pipe acting on the first and second insertion holes 51a and 52a, and the inner peripheral surfaces of the first and second insertion holes 51a and 52a. If a gap is formed between the outer peripheral surface of the first mounting pin and the first and second mounting pins, abnormal noise is generated due to slippage when the vehicle suddenly starts or suddenly brakes. Therefore, the diameters of the shaft portions of the first and second mounting pins are made larger than the diameters of the first and second insertion holes 51a and 52a so as to have a tightening allowance.

  However, if the tightening margin is set large, the bulging portion is provided at the tips of the first and second mounting pins, so that the first and second mounting pins are inserted into the first and second insertion holes 51a and 52a. When press-fitting, a great amount of labor is required, and the insertability of the first and second mounting pins is deteriorated. On the contrary, if the tightening margin is set small in order to improve the insertability of the first and second mounting pins, the first and second mounting pins 51a and 52a are inserted into the first and second mounting pins in the state of use in an actual vehicle. It becomes easy to come out of the camera and becomes a problem.

  Therefore, Patent Document 1 discloses that both ends of an arm hole (second insertion hole) through which a mounting arm (second mounting pin) provided in the exhaust pipe is inserted for the purpose of satisfying both the above-described contradiction events. A muffler support in which the diameter of the opening is made larger than the diameter of the mounting arm and the diameter of the central portion in the axial direction of the arm hole is made smaller than the diameter of the mounting arm is disclosed.

In Patent Document 2, a fixing member having an engagement piece that is ring-shaped and protrudes in the central axis direction of the ring at least at a part of the inner peripheral portion is provided with a large diameter at the tip of a bracket pipe (second mounting pin). A technique is disclosed in which the bracket pipe can be reliably prevented from coming off by being inserted into the outer periphery inside the portion (the bulging portion). However, in this case, since the fixing member is used to prevent the bracket pipe from coming off, the number of parts increases and the assembly work process also increases.
Japanese Utility Model Publication No. 2-143324 JP-A-8-28259

  The present invention has been made in view of the above circumstances, and it is an object to be solved to provide a muffler support that can more reliably prevent the mounting pin from coming off without adding new parts. It is.

  According to a first aspect of the present invention for solving the above-mentioned problem, a first holding part having a first insertion hole provided in a vehicle body and having a first attachment pin having a bulging part at the tip is inserted and held therein, and the exhaust pipe is provided. A second holding portion having a second insertion hole through which a second mounting pin having a bulging portion at the tip is inserted and held, and disposed at a distance from the first holding portion, the first holding portion and the first holding portion In a rubber muffler support provided with a pair of connecting portions that connect the two holding portions on both sides thereof, the first and second holding portions are open end portions of one of the first and second insertion holes. The first and second insertion holes are formed so as to project radially inward from the inner peripheral surfaces of the first and second insertion holes and intermittently extend in the circumferential direction, and are inserted and held in the first and second insertion holes. And an elastic stopper for preventing the second mounting pin from coming off.

  The muffler support of the present invention is used when the exhaust pipe is attached to the vehicle body. At that time, the first attachment pin provided on the vehicle body is inserted and held in the first insertion hole, and the second attachment pipe is provided on the exhaust pipe. The mounting pin is inserted and held in the second insertion hole. At this time, as for the 1st and 2nd mounting pins, the bulging part of the front-end | tip is provided in one opening edge part (the exit side opening edge part of a 1st and 2nd mounting pin) of the 1st and 2nd insertion hole. The elastic stopper is elastically deformed so as to be bent in the advancing direction, and is inserted and held in a state of protruding to the outside of the first and second insertion holes. As a result, the elastic stopper that is elastically deformed so as to be bent is pressed against the outer peripheral surfaces of the first and second mounting pins with an urging force by an elastic return action, and its tip surface is in contact with the rear surface of the bulging portion. It will be in the state of contact or opposite.

  In this state, when an external force is applied in such a direction that the first and second mounting pins are pulled out from the first and second insertion holes, the bulging portions of the first and second mounting pins are engaged with the elastic stoppers in the pulling direction. Movement is prevented. At this time, since the elastic stopper is in pressure contact with the outer peripheral surface of the first and second mounting pins with a biasing force, the first and second mounting pins are compressed by the bulging portions of the first and second mounting pins. 2 Tighten the outer peripheral surface of the mounting pin firmly. This reliably prevents the first and second mounting pins from coming out of the first and second insertion holes.

  In addition, since the elastic stopper is divided so as to be intermittently extended in the circumferential direction, and the thickness, protrusion height, and the like can be appropriately adjusted, the first and second The resistance force when elastically deforming so as to be bent when the mounting pin is inserted is small. Therefore, there is little influence on the insertability of the first and second mounting pins.

  Furthermore, since the muffler support of the present invention can be integrally formed by vulcanization molding of a rubber material, the elastic stopper can also be easily formed integrally. Therefore, when the elastic stopper is provided, the number of parts does not increase and the cost does not increase significantly.

  The elastic stopper according to the present invention has a diameter from one inner end surface of the first and second insertion holes to one opening end portion (the outlet side opening end portion of the first and second mounting pins) of the first and second insertion holes. It is provided so as to protrude inward in the direction. The protruding height of the elastic stopper is preferably 10 to 20% with respect to the diameters of the first and second insertion holes. When it is less than 10%, it becomes difficult to obtain a function as a stopper. Conversely, if it exceeds 20%, the function as a stopper increases, but it tends to adversely affect the insertability of the first and second mounting pins. The elastic stopper is provided on the inner side in the axial direction of the elastic stopper by adjoining the elastic stopper with an annular recess that extends in the circumferential direction and is recessed radially outward from the peripheral surfaces of the first and second insertion holes. The protrusion height can be substantially increased.

  Further, the elastic stopper is formed so as to be divided at several places in the circumferential direction and intermittently extend in the circumferential direction. By doing in this way, the resistance force at the time of elastically deforming so that it may bend at the time of insertion of the 1st and 2nd attachment pins is reduced, and the influence which it has on the insertability of the 1st and 2nd attachment pins decreases. Although the number of parts to be divided can be selected as appropriate, it is preferable that the divided parts are equally spaced in the circumferential direction.

  In the present invention, it is preferable that the tightening margin between the first and second mounting pins and the first and second insertion holes is in the range of 0.5 to 1.0 mm. In this case, the first and second mounting pins have a bulging portion that bulges radially outward at the tip, but the tightening margin is set not by the bulging portion but by the first and second mounting pins. The diameter of the portion inserted and held in the second insertion hole is used as a reference.

  Further, in the present invention, it extends inward in the axial direction from the opening end to the other opening side of the first and second insertion holes (inlet side of the first and second mounting pins), and gradually toward the inner side in the axial direction. A groove having a shallow depth can be provided. In this way, when the bulges at the tips of the first and second mounting pins are inserted into the first and second insertion holes, the openings of the first and second insertion holes are easily expanded by the concave grooves. Since it opens, since the pressing force at the time of the press-fitting start of the first and second mounting pins can be small, the insertability can be further improved. The concave grooves are preferably provided at equal intervals in a plurality of locations in the circumferential direction. It is preferable that the width is gradually narrowed toward the inner side in the axial direction. If it does in this way, it will become possible to insert a 1st and 2nd attachment pin (press-fit) much more smoothly.

  According to the muffler support of the present invention, the first and second holding portions are radially inward from the inner peripheral surfaces of the first and second insertion holes at one opening end of the first and second insertion holes. Since the elastic stopper that protrudes and extends intermittently in the circumferential direction is provided, it is possible to more reliably prevent the mounting pin from coming off without adding new parts.

  The first and second holding portions extend inward in the axial direction from the opening end to the other opening side of the first and second insertion holes (inlet side of the first and second mounting pins). If the first and second mounting pins are inserted into the first and second insertion holes, the pressing force at the start of press-fitting can be reduced. Therefore, the insertability of the first and second mounting pins can be further improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1
FIG. 1 is a cross-sectional view of the muffler support according to the present embodiment, which is a cross-sectional view taken along the line II of FIG. 2, and FIG. 2 is a front view of the muffler support.

  As shown in FIGS. 1 and 2, the muffler support of the present embodiment includes a first holding portion 1 having a first insertion hole 1a, a first elastic stopper 1b and a first annular recess 1c, a second insertion hole 2a, 2 The second holding part 2 which has the elastic stopper 2b and the second annular recess 2c and is arranged at a distance from the first holding part 1, and the first holding part 1 and the second holding part 2 are connected on both sides thereof. It is composed of a pair of connecting portions 3 and 3 and a central connecting portion 4 that connects the central portions of the connecting portions 3 and 3, and is formed of a rubber molded body integrally formed by vulcanization molding of a rubber material. ing.

  The first holding portion 1 is formed in a block shape, and a first insertion hole 1a through which a first mounting pin 10 (see FIG. 3) provided in the vehicle body is inserted and held is provided in the thickness direction at a substantially central portion thereof. It is penetrated by. The first insertion hole 1a has a circular cross section and a substantially constant diameter in the length direction. One open end of the first insertion hole 1a is provided with an elastic stopper 1b that protrudes radially inward from the circumferential surface of the first insertion hole 1a and intermittently extends in the circumferential direction. The elastic stopper 1b is divided into two parts by forming notches at two locations in the circumferential direction, and is formed in a semicircular arc shape. The elastic stopper 1b has a substantially constant thickness (about 2 mm) and a protruding height of about 2 mm (10 to 20% of the diameter of the first insertion hole 1a).

  On the inner side in the axial direction of the elastic stopper 1b, an annular recess 1c extending in the circumferential direction is provided adjacent to the elastic stopper 1b and is recessed radially outward from the peripheral surface of the first insertion hole 1a. The annular recess 1c has a U-shaped cross section, a depth of about 1 mm, and a width of about 2 mm.

  The first mounting pin 10 inserted and held in the first insertion hole 1a bulges radially outward at the tip of the shaft portion 10a having a diameter slightly larger than the diameter of the first insertion hole 1a. It has a portion 10b (about 1.3 times the diameter of the first insertion hole 1a). The tightening margin between the first mounting pin 10 and the first insertion hole 1a is about 0.4 to 1.0 mm.

  The second holding unit 2 is formed in the same shape as the first holding unit 1 and is arranged at a predetermined distance from the first holding unit 1. The second holding portion 2 has a second insertion hole 2a, a second elastic stopper 2b, and a second annular groove 2c that are formed exactly the same as those of the first holding portion 1. In addition, the 2nd attachment pin (not shown) penetrated and hold | maintained at the 2nd penetration hole 2a uses what was formed completely the same as the 1st attachment pin 10 (part shown by FIG. 3).

  The pair of connecting portions 3 and 3 are formed in the same arc shape, and both ends thereof are connected to the side portion of the first holding portion 1 and the side portion of the second holding portion so as to be symmetrical. Has been placed. As a result, the first holding part 1 and the second holding part 2 are connected so as to form a substantially elliptical ring in which the direction in which the first holding part 1 and the second holding part 2 face each other has a long diameter and the direction in which the pair of connecting parts 3 and 3 face each other has a short diameter. ing.

  The central connecting portion 4 is formed in a flat plate shape, and both ends are connected to the central portion of the pair of connecting portions 3 and 3, and a predetermined distance is separated between the first holding portion 1 and the second holding portion 2. Is arranged.

  The muffler support of the present embodiment configured as described above has the first mounting pin 10 provided in the vehicle body inserted and held by press-fitting into the first insertion hole 1a, and the second mounting pin provided in the exhaust pipe. (Not shown) is attached by being inserted and held in the second insertion hole 2a by press fitting.

  At this time, in the case of the first mounting pin 10, as shown in FIG. 3A, when the first mounting pin 10 is inserted from the opening on the opposite side of the first insertion hole 1a to the first elastic stopper 1b, The bulging portion 10b at the tip passes through the first elastic stopper 1b provided at the opening end on the outlet side of the first insertion hole 1a while being elastically deformed so as to be bent in the traveling direction. Since the tightening allowance between the first mounting pin 10 and the first insertion hole 1a is set to be small and the first elastic stopper 1b is divided in the circumferential direction, a large pressure input from the first mounting pin 10 is necessary. And not.

  As a result, as shown in FIG. 3B, the shaft portion 10a is inserted and held in the first insertion hole 1a with the bulging portion 10b protruding outside the first insertion hole 1a. Thus, the first elastic stopper 1b elastically deformed so as to be bent is brought into pressure contact with the outer peripheral surface of the first mounting pin 10 with the urging force due to the elastic return action, and the tip surface thereof is on the rear side of the bulging portion 10b. It will be in contact with or opposite to the surface.

  In this state, when an external force in a direction in which the first mounting pin 10 is pulled out from the first insertion hole 1a is applied, the bulging portion 10b of the first mounting pin 10 is moved to the first elastic stopper 1b as shown in FIG. And is prevented from moving in the removal direction. At this time, since the first elastic stopper 1b is in pressure contact with the outer peripheral surface of the first mounting pin 10 with a biasing force, the first elastic stopper 1b is compressed in the axial direction by the bulging portion 10b of the first mounting pin 10 and is annularly recessed 1c. It will be pushed in. Thereby, as for the 1st attachment pin 10, the axial part 10a is firmly clamp | tightened by the 1st elastic stopper 1b, and the removal | extraction from the 1st penetration hole 1a is prevented reliably.

  Even when the second mounting pin is inserted and held in the second insertion hole 2a, the second mounting pin is inserted and held in the same manner as in the case of the first mounting pin 10, and similarly, It is also possible to reliably prevent the second insertion hole 2a from coming out.

  As described above, according to the muffler support of the present embodiment, the first and second holding portions 1 and 2 are arranged at the first and second opening end portions of the first and second insertion holes 1a and 2a. Since the first and second elastic stoppers 1b and 2b project radially inward from the inner circumferential surfaces of the insertion holes 1a and 2a and intermittently extend in the circumferential direction, the first and second The second mounting pin 10 can be prevented from coming off more reliably, and the first and second mounting pins 10 can be inserted more satisfactorily.

  In the present embodiment, the first and second elastic stoppers 1b and 2b are axially inward in a circumferential direction that is recessed radially outward from the circumferential surfaces of the first and second insertion holes 1a and 2a. Since the extending first and second annular recesses 1c and 2c are provided adjacent to the first and second elastic stoppers 1b and 2b, the protruding height of the first and second elastic stoppers 1b and 2b is substantially reduced. This can be increased, which is advantageous in preventing the first and second mounting pins 10 from coming off more reliably.

  In the present embodiment, since the first mounting pin 10 and the second mounting pin have the same shape and the same size, the first insertion hole 1a and the second insertion hole 2a have the same shape and the same. When the first mounting pin 10 and the second mounting pin having different sizes and sizes are employed, the first insertion hole 1a and the second insertion hole 2a are appropriately changed in accordance with them. The

  In the present embodiment, the first and second mounting pins 10 are inserted in the same direction with respect to the first and second insertion holes 1a and 1b. The elastic stoppers 1b and 2b are provided at the opening end on the same side. However, when the first and second mounting pins 10 are configured to be inserted in opposite directions, the first elastic stopper 1b and A second elastic stopper 2b is provided at the opening end on the opposite side.

  Further, the muffler support of the present embodiment has a structure having the central connecting portion 4, but the present invention can also be applied to a muffler support having a structure not having the central connecting portion 4.

[Embodiment 2]
4 is a cross-sectional view of the muffler support according to the present embodiment, and is a cross-sectional view taken along line IV-IV in FIG. 5, FIG. 5 is a front view of the muffler support, and FIG. FIG.

  The muffler support of the present embodiment is provided on the other opening side of the first and second insertion holes 1a and 2a (the inlet side of the first and second mounting pins 10) with respect to the muffler support of the first embodiment. Grooves 1d and 2d are added. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and different points will be mainly described.

  As shown in FIGS. 4 and 6, the concave grooves 1d and 2d are provided at two locations in the circumferential direction on the other opening side of the first and second insertion holes 1a and 2a. The concave grooves 1d and 2d are U-shaped in cross section, extend inward in the axial direction from the opening end to the substantially central portion, and gradually become shallower in the axial direction, and gradually decrease in the axial direction. The width is formed to be narrow. The depth of the opening edge of the concave grooves 1d and 2d is about 1.0 to 1.5 mm.

  As shown in FIG. 7, the muffler support of the present embodiment configured as described above has a first insertion passage when, for example, the bulging portion 10b at the tip of the first mounting pin 10 is inserted into the first insertion hole 1a. Since the opening of the hole 1a is easily expanded by the concave groove 1d, the pressing force at the start of press-fitting of the first mounting pin 10 can be small. Therefore, the insertability of the first mounting pin 10 is further improved. Further, when the second mounting pin is inserted into the second insertion hole, it is the same as the case of the first mounting pin 10.

  As described above, according to the muffler support of the present embodiment, the first and second holding portions 1 and 2 are connected to the other opening side of the first and second insertion holes 1a and 2a (first and second mounting pins). Of the first and second mounting pins is further improved since the grooves 1d and 2d extend inward in the axial direction from the opening end and gradually decrease in depth in the axial direction. Can be good. Further, the concave grooves 1d and 2d are formed so that the width gradually becomes narrower inward in the axial direction, so that the insertability of the first and second mounting pins can be further improved.

  In this embodiment, the concave grooves 1d and 2d are provided at two locations in the circumferential direction, but may be provided at equal intervals in three or more locations.

It is sectional drawing of the muffler support which concerns on Embodiment 1 of this invention, Comprising: It is the II sectional view taken on the line of FIG. It is a front view of the muffler support concerning Embodiment 1 of the present invention. It is explanatory drawing which shows the state in which a mounting pin is attached to the muffler support which concerns on Embodiment 1 of this invention. It is sectional drawing of the muffler support which concerns on Embodiment 2 of this invention, Comprising: It is the IV-IV arrow directional cross-sectional view of FIG. It is a front view of the muffler support which concerns on Embodiment 2 of this invention. It is a rear view of the muffler support which concerns on Embodiment 2 of this invention. It is explanatory drawing which shows the state by which an attachment pin is inserted in the muffler support which concerns on Embodiment 2 of this invention. It is sectional drawing of the conventional muffler support, Comprising: It is the VIII-VIII arrow directional cross-sectional view of FIG. It is a front view of the conventional muffler support.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 51 ... 1st holding part 1a, 51a ... 1st insertion hole 1b ... 1st elastic stopper 1c ... 1st annular recessed part 1d ... 1st recessed groove 2, 52 ... 2nd holding part 2a, 52a ... 2nd insertion hole 2b ... 2nd elastic stopper 2c ... 2nd annular recessed part 2d ... 2nd recessed groove 3, 53 ... Connection part 4, 54 ... Central connection part 10 ... 1st attachment pin 10a ... Shaft part 10b ... Swelling part

Claims (7)

A first holding portion having a first insertion hole, which is provided in the vehicle body and through which a first mounting pin having a bulging portion at the tip is inserted and held, and a second mounting pin provided in the exhaust pipe and having a bulging portion at the tip are inserted. A second holding part having a second insertion hole to be held and arranged at a distance from the first holding part, and a pair of connections for connecting the first holding part and the second holding part on both sides thereof In a rubber muffler support provided with a part,
The first and second holding portions protrude radially inward from the inner peripheral surfaces of the first and second insertion holes at one opening end of the first and second insertion holes, and are intermittent in the circumferential direction. A muffler support comprising an elastic stopper formed so as to extend and preventing the first and second mounting pins from being inserted and held in the first and second insertion holes.   In the elastic stopper, the first and second mounting pins are inserted into the first and second insertion holes, and the bulging portions at the tips of the first and second mounting pins are the first and second insertion holes. The elastic stopper is elastically deformed so that the elastic stopper is bent by the bulged portion when inserted and held in a state of protruding to the outside, and the front end surface thereof is the rear side surface of the bulged portion of the first and second mounting pins. The muffler support according to claim 1, wherein the muffler support is configured so as to face the frame.   The muffler support according to claim 1 or 2, wherein a protruding height of the elastic stopper is 10 to 20% with respect to a diameter of the first and second insertion holes.   On the inner side in the axial direction of the elastic stopper portion, an annular concave portion extending in the circumferential direction is provided adjacent to the elastic stopper and is recessed radially outward from the inner peripheral surfaces of the first and second insertion holes. The muffler support according to claim 1.   The muffler support according to claim 1, wherein a tightening margin between the first and second mounting pins and the first and second insertion holes is 0.4 to 1.0 mm.   The first and second holding portions have concave grooves on the other opening side of the first and second insertion holes, extending inward in the axial direction from the opening end and gradually decreasing in depth in the axial direction. The muffler support according to claim 1.   The muffler support according to claim 6, wherein the groove has a width that gradually decreases inward in the axial direction.

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