JP2010269645A - Power unit supporting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve improvement of rigidity of a mount member, reduction of vibration transmitted from a power unit via the mount member, and protection of a supporting member in a power unit supporting device. <P>SOLUTION: A lower member (13) is provided with a vertical wall part (48), which is curved upward from a bottom surface part (47) and whose upper end is joined to upper member (12), at the outer circumferential side of a cushion rubber (25). Curved part (49), which is curved to the upper side of the vertical wall part (48), is arranged in proximity to the outer circumferential part (40) in the radial direction of a washer (38). An opening part (45) is set up as a burring hole (51), which has a peripheral wall (50) protruding in the downward direction of a vehicle around the opening part (45). The peripheral wall (50) of the burring hole (51) is formed at a position that overlaps with the curved part (49). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power unit support device, and more particularly to a power unit support device that reduces vibrations transmitted from a power unit to a vehicle body.

In the case of a power unit layout consisting of a vertically mounted engine and a transmission in a vehicle, the mount type is generally arranged at the left front portion / right front portion of the vertically mounted engine and the rear end portion of the transmission. The so-called three-point pitch mount method is employed.
In such a pitch mount system, when the mount portion is laid out at the rear end portion of the transmission, a mount member (rear mount member) attached to the vehicle body is required to mount and support the rear end portion of the transmission. . As this mount member, a lightweight and compact shape is desirable while strength and rigidity are required.

Japanese Utility Model Publication No. 3-110236 The engine support device according to Japanese Patent Laid-Open No. Hei 8-192277 forms a recess in the end face of the cushion rubber that is fitted to each other across the mounting hole of the mount member to form a communication hole. A cushion rubber and a washer are fitted into a mount member in advance, positioned and attached, and a bolt is inserted through the cushion rubber and the washer. In the vehicle frame structure according to Patent Document 2, elastic support structures are provided on the front side and the rear side of the center member, respectively, and the rear side of the center member is disposed below the suspension subframe so that vibration and sound are transmitted to the vehicle body. This is to prevent this from happening.

Incidentally, in a conventional power unit support apparatus, as shown in FIG. 7, a mount member (rear mount member) 101 is attached to a right side frame 103 and a left side frame 104 as a vehicle body 102 with respective bolts 105. The mount member 101 is formed with an opening for mounting the bolt 105 at a site for attachment to the vehicle body 102. Thereby, in this part, compared with another part, rigidity becomes low and it is easy to generate | occur | produce a vibration.
In order to increase the rigidity of the mounting portion of the mount member 101, there are various means such as increasing the plate thickness of the mount member 101 or combining two plates. Inconvenience such as increase was caused.
Further, as shown in FIG. 8, there is a floating structure in which the engine vibration is not directly transmitted to the vehicle body 102, and is fastened via a lower cushion rubber 106 and an upper cushion rubber 107 between the mount member 101 and the vehicle body 102. . At this time, when the vehicle travels on a rough road, a protector 108 is added separately so as to cover the bolt 105 from below, and the bolt 105 and the lower cushion rubber 106 are protected from a stepping stone during traveling. There was a need. However, it is structurally difficult to cover the entire circumference of the bolt 105 and the lower cushion rubber 106 with a separate protector 108, and a gap is opened over substantially the entire circumference, so stepping stones, water, sand, dust, etc. Intrusion of the bolt 105 and the lower cushion rubber 106 may be allowed, or the provision of a separate protector 108 increases the number of parts and the assembly process. There was an inconvenience that increased.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a power unit support device that can improve the rigidity of the mount member, reduce vibration transmitted from the power unit to the vehicle body via the mount member, and protect the support device such as cushion rubber. is there.

  The present invention is a hollow member formed by joining an upper member member and a lower member member, and a mount member that supports a power unit is attached to the vehicle body, and mounting holes to the vehicle body are formed on both longitudinal sides of the upper member member, A pair of cushion rubbers that have communication holes that communicate with the mounting holes and that are connected to each other through the mounting holes are disposed on the upper and lower sides of the upper member member, and the mounting holes penetrate through the mounting holes. A spacer extending in the vertical direction is inserted, and an upper end portion of the spacer is brought into contact with the vehicle body, and a washer that is brought into contact with a lower end of the cushion rubber is brought into contact with a lower end of the spacer, and a bolt that penetrates the inside of the spacer is used. The washer is fixed to a lower portion of the vehicle body, and the bolt and the washer are attached to the lower member member. In the power unit support device in which the opening for assembling is formed, the lower member member is provided with a vertical wall portion curved upward from the bottom surface portion and joined at the upper end to the upper member member on the outer peripheral side of the cushion rubber, A curved portion that curves upwardly of the vertical wall portion is disposed at a position close to the radially outer peripheral portion of the washer, and the opening portion is a burring hole provided with a peripheral wall projecting downward in the vehicle around the opening portion. The peripheral wall of the burring hole is formed at a position overlapping the curved portion.

  The power unit support device of the present invention can improve the rigidity of the mount member, reduce vibration transmitted from the power unit to the vehicle body via the mount member, and protect the support device such as cushion rubber.

FIG. 1 is an enlarged cross-sectional view of a power unit support device. (Example) FIG. 2 is a plan view of the mount member. (Example) FIG. 3 is a rear view of the mount member. (Example) FIG. 4 is a bottom view of the mount member. (Example) FIG. 5 is a right side view of the mount member. (Example) FIG. 6 is a perspective view of the power unit supported by the mount member. (Example) FIG. 7 is a bottom view of the mount member attached to the vehicle body. (Conventional example) FIG. 8 is a cross-sectional view of the mounting portion of the mount member taken along line VIII-VIII in FIG. (Conventional example)

  The present invention achieves the objects of reducing the vibration transmitted from the power unit to the vehicle body via the mount member and protecting the support device such as cushion rubber by improving the rigidity of the mount member.

1 to 6 show an embodiment of the present invention.
2 to 6, reference numeral 1 denotes a vehicle body. The vehicle body 1 includes a left side frame 2 and a right side frame 3 that extend in the vehicle longitudinal direction X.
A mount member (rear mount member) 4 extending in the vehicle left-right direction (vehicle width direction) Y is attached to the left side frame 2 and the right side frame 3.
As shown in FIG. 6, a power unit 5 is installed in the vehicle body 1.
The power unit 5 includes a longitudinal engine 6 having a crankshaft extending direction along the longitudinal direction X of the vehicle, and a transmission 7 provided at the rear of the vehicle with respect to the longitudinal engine 6. He mount support (elastic support).

  As shown in FIG. 6, the mount portion 8 includes a left front mount portion 9 and a right front mount portion 10 for mounting the left and right positions of the longitudinal engine 6 positioned on the front side to the vehicle body 1 and a transmission 7 positioned on the rear side. The power unit 5 is composed of the left front mounting portion 9, the right front mounting portion 10, and the rear mounting portion 11, that is, the pitch mounting method. To mount on the vehicle body 1. The left front mount portion 9 is supported by the left side frame 2. The right front mount portion 10 is supported by the right side frame 3. The rear mount portion 11 is supported by the mount member 4.

As shown in FIGS. 1 to 4, the mount member 4 is a box type in which an upper member member 12 and a lower member member 13 are joined by a joint portion 14, and has a monaca structure in which the entire circumference is joined by welding. The front member portion 16 and the rear member portion 17 formed in a hollow shape having 15 are provided in parallel in the vehicle longitudinal direction X, and both end portions in the vehicle width direction Y are attached to the vehicle body 1 so that the rear end portion of the power unit 5 is attached. It is something to support.
As described above, the mount member 4 has a monaca structure, and the mount member 4 includes the front member portion 16 and the rear member portion 17 that are parallel to the vehicle longitudinal direction X. It is possible to ensure rigidity and strength, and it is possible to reduce the weight while suppressing the thickness of the plate, which is conventionally thick.
That is, in the conventional structure, since the rigidity of the mounting portion of the mount member 4 to the vehicle body 1 is low, the height and width of the entire upper member member 12 including the mounting portion of the mount member 4 are increased to ensure rigidity. However, in this embodiment, since the lower member member 13 is joined to the upper member member 12 over the entirety thereof, the rigidity of the mounting portion of the mount member 4 to the vehicle body 1 can be increased. For this reason, the height and width of the upper member member 12 can be reduced, thereby making it possible to reduce the weight and to suppress the drawing depth, to improve productivity, and to set the ground height of the mount member 4 high. It is possible to improve the rough road running performance of the vehicle.
As shown in FIG. 2, a flat rear mount mounting portion 18 for mounting the rear mount portion 11 for supporting the rear end portion of the power unit 5 is provided on the upper surface of the central portion of the upper member member 12. .

The mount member 4 is attached to the left side frame 2 and the right side frame 3 whose both side portions in the longitudinal direction are the vehicle body 1.
For this reason, a left front mounting hole 19 and a left rear mounting hole 20 to the left side frame 2 are formed in parallel on both sides in the longitudinal direction of the upper member member 12, and a right front mounting to the right side frame 3 is formed. The hole 21 and the right rear mounting hole 22 are formed in parallel.
A support device 23 for attaching the both longitudinal sides of the mount member 4 to the left side frame 2 and the right side frame 3 as the vehicle body 1 is provided in each of the attachment holes 19 to 22.

In this support device 23, the parts provided in the respective mounting holes 19 to 22 have the same structure. Therefore, here, the right front mounting hole 21 illustrated in FIG. 1 (hereinafter simply referred to as “mounting hole 21”). ) Only the structure of the part is described, and the description of the other part is omitted.
That is, as shown in FIG. 1, a vehicle body side hole portion 24 having a required inner diameter is formed at a position corresponding to the mounting hole 21 at a lower portion of the right side frame 3 that is the vehicle body 1. A lower cushion rubber 25 and an upper cushion rubber 26 are disposed as a pair of cushion rubbers on both upper and lower sides of the upper member member 12.
The lower cushion rubber 25 includes a lower communication hole 27 that communicates with the attachment hole 21, a central protrusion 28 that protrudes upward, an upper member attachment part 29 that is positioned lower than the central protrusion 28, and a lower notch groove. 30.
The upper cushion rubber 26 holds the upper communication hole 31 communicating with the mounting hole 21, the contact part 32 contacting the inner surface of the vehicle body side hole 24 of the vehicle body 1, and the peripheral edge of the mounting hole 21 of the upper member member 12 from above. It has a pressing part 33, an engagement groove part 34 that engages with the central protrusion 28 of the lower cushion rubber 25, and an upper notch groove 35.
The lower cushion rubber 25 and the upper cushion rubber 26 penetrate the attachment hole 21 and are connected to each other in the vertical direction.

A spacer 37 having an axial space 36 extending through the attachment hole 21 and extending in the vertical direction is inserted into the lower cushion rubber 25 and the upper cushion rubber 26. The upper end portion of the spacer 37 is in contact with the bottom surface of the right side frame 3.
A washer 38 is provided in contact with the lower end of the lower cushion rubber 25. The washer 38 has a washer hole 39 having an inner diameter smaller than that of the lower communication hole 27 and the upper communication hole 31, and is in contact with the lower end of the spacer 37. The outer peripheral portion 40 in the radial direction of the washer 38 is formed to have substantially the same diameter as the outer peripheral surface portion 41 of the lower cushion rubber 25. The washer 38 is fixed to the lower portion of the right side frame 3 by a bolt 42 that penetrates the axial space 36 inside the spacer 37. The bolt 42 is inserted into the head 43 having an outer diameter larger than the washer hole 39 of the washer 38 and the lower communication hole 27 and the upper communication hole 31, and the tip of the nut 42 is disposed in the right side frame 3 ( And a shaft portion 44 that is fastened to (not shown).

In the lower member member 13, an opening 45 for assembling a support device such as a bolt 42 and a washer 38 is formed at a location corresponding to the mounting hole 21 of the upper member member 12. As shown in FIG. 1, the opening 45 has an insertion hole 46 having an inner diameter D necessary for inserting a support device such as the lower cushion rubber 25 and the bolt 42.
That is, in a vehicle that is assumed to travel off-road, it is necessary to take measures to protect the support device from stepping stones during traveling. Therefore, in this embodiment, the mount member 4 has a monaca structure to cover the entire circumference of the lower cushion rubber 25 and protect the bolts 42 and the lower cushion rubber 25 from flying stones. Further, the contact with water, sand, dust and the like is reduced, and the corrosion resistance of the bolt 42 and the lower cushion rubber 25 is improved. Conventionally, a separate protector has been added as a countermeasure against a stepping stone. However, the mount member 4 having a monaca structure eliminates the need for such parts and can reduce costs.

The lower member 13 includes a vertical wall portion 48 that is curved upward from the bottom surface portion 47 and whose upper end is joined to the upper member member 12 on the outer peripheral side of the lower cushion rubber 25. A curved portion 49 that curves upwardly of the vertical wall portion 48 is an arc having a radius R with the center being O, and the center O is disposed at a position close to the radially outer peripheral portion 40 of the washer 38.
As described above, since the curved portion 49 that curves upward from the bottom surface portion 47 of the lower member member 13 is disposed at a position close to the radially outer peripheral portion 40 of the washer 38, the outer periphery of the opening 45 formed at the lower portion of the lower member member 13 is arranged. A relatively straight vertical wall portion 48 can communicate with the upper end portion of the lower member member 13 joined to the upper member member 12. Therefore, the vertical wall portion 48 extending upward from the bottom surface portion 47 of the lower member member 13 can be structured so as not to be deformed by opening due to the vibration of the power unit 5.

The opening 45 is a burring hole 51 provided with a peripheral wall 50 that protrudes downward in the vehicle around the opening 45. That is, the peripheral wall 50 of the burring hole 51 is formed at a position overlapping the curved portion 49.
Thus, since the opening 45 is a burring hole 51 provided with a peripheral wall 50 projecting downward in the vehicle around the opening 45 and the peripheral wall 50 of the burring hole 51 is formed at a position overlapping the curved portion 49, the burring hole The peripheral wall 50 of 51 can improve the rigidity, and the vertical wall portion 48 extending upward from the bottom surface portion 47 of the lower member member 13 can be structured so as not to be deformed by opening of the power unit 5.

Conventionally, since the opening 45 for inserting the lower cushion rubber 25 is merely a notch hole, the opening 45 is overlapped with the curved portion 49 as shown by a one-dot chain line in FIG. It cannot be formed. For this reason, since the straight portion 109 is necessary, the width of the mount member 4 is necessarily long. That is, there is a problem that the width of the mount member 4 becomes longer in the vehicle front-rear direction X (indicated by a dashed line arrow).
However, in this embodiment, the burring process is performed at a position overlapping with the curved portion 49, thereby eliminating the need for the straight portion 109 and suppressing the width of the mount member 4. Thus, the mount member 4 can be made compact and lightweight. It is. Further, the burring process in the opening 45 contributes to the improvement of the rigidity of the mount member 4 by forming the peripheral wall 50.
As a result, the vibration of the upper member member 12 can be suppressed by the lower member member 13 and the vibration transmitted from the power unit 5 to the vehicle body 1 via the mount member 4 can be reduced.

  The support device according to the present invention can be applied to various support structures.

1 body
2 Left side frame
3 Right side frame
4 Mount members
5 Power unit
6 Vertical engine
7 Transmission
8 Mount part
11 Rear side mount
12 Upper member member
13 Lower member
19-22 Mounting hole
23 Support device
25 Lower cushion rubber
26 Upper cushion rubber
37 Spacer
38 washer
40 radially outer periphery
42 volts
45 opening
46 insertion slot
47 Bottom
48 Vertical wall
49 Curved part
50 wall
51 burring hole

Claims (1)

  A hollow mount member that joins the upper member member and the lower member member and that supports the power unit is attached to the vehicle body, and attachment holes to the vehicle body are formed on both longitudinal sides of the upper member member. A pair of cushion rubbers that have communication holes that communicate with each other and that are connected to each other through the mounting hole are disposed on both upper and lower sides of the upper member member, and extend vertically through the mounting hole inside the cushion rubber. A spacer is inserted, an upper end portion of the spacer is brought into contact with the vehicle body, a washer that is brought into contact with a lower end of the cushion rubber is brought into contact with a lower end of the spacer, and the washer is moved by a bolt that penetrates the inside of the spacer. Fixed to the lower part of the vehicle body, the bolt and the washer are assembled to the lower member member In the power unit support device in which an opening is formed, the lower member member is provided with a vertical wall portion curved upward from a bottom surface portion and having an upper end joined to the upper member member on an outer peripheral side of the cushion rubber. A curved portion that is curved upward is disposed at a position close to the radially outer peripheral portion of the washer, and the opening portion is a burring hole having a peripheral wall projecting downward in the vehicle around the opening portion. A power unit support device, wherein the peripheral wall of the power unit is formed at a position overlapping the curved portion.

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