JP2002331844A - Propeller shaft structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the supporting rigidity and the assembling property when a propeller shaft having a center support is fixed to an engine mount bracket. SOLUTION: In a structure of a vehicle propeller shaft in which an engine, a transmission and a transfer parallel to each other are mounted on a vehicle, a front propeller shaft for transmitting the driving force is provided on the front side, a rear propeller shaft for transmitting the driving force is provided on the rear side, a center support for supporting a middle part is provided on the front propeller shaft, and the center support is fixed to a mount bracket to support the engine by a side frame of a chassis, the center support is fixed to a lower part of the mount bracket via first and second fitting members holding the lower part of the outer circumference of the center support, and the center support is fixed to an upper part of the mount bracket via a third fitting member provided at the position separate from each fitting member upwardly in the perpendicular direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propeller shaft structure for a vehicle, and more particularly to a propeller shaft for a vehicle for improving support rigidity and assembling property when a propeller shaft with a center support is fixed to an engine mount bracket. It is about structure.

[0002]

2. Description of the Related Art A four-wheel drive vehicle is equipped with an engine, a transmission, and a transfer. The transfer includes a front propeller shaft that transmits driving force to a front side and a rear propeller shaft that transmits driving force to a rear side. The connection is provided.

[0003] As a propeller shaft structure of a vehicle, there is one disclosed in Japanese Patent Application Laid-Open No. 9-109708.
The propeller shaft structure of the vehicle disclosed in this publication,
A narrow portion is formed between the screw hole of the support member and the end of the flange portion in the vehicle width direction, and when a collision input acts on the propeller shaft, it is transmitted from the contact portion to the support member, and stress concentrates on the narrow portion. Occurs and the propeller shaft separates from the vehicle body and becomes bendable between the joint members. Let me.

[0004] There is also one disclosed in JP-A-2000-79827. The propeller shaft support structure disclosed in this publication is provided with a propeller shaft between a transmission mounted on a vehicle and a differential, a center support for holding the propeller shaft halfway, and mounting the center support on a vehicle body. In the propeller shaft support structure that fixes the bracket to the vehicle body side with the fixture,
On the vehicle body mounting bracket, a long mounting long groove is formed in the front-rear direction of the vehicle to be mounted on the mounting tool mounted on the vehicle body side,
It allows one worker to assemble the propeller shaft and prevents movement of the center support.

[0005] Further, there is one disclosed in JP-A-2000-153717. The power train structure of an automobile disclosed in this publication includes a power train structure of an automobile in which a propeller shaft is disposed so as to intersect a mount bracket of an engine mount structure that elastically supports an engine on a vehicle body. Is provided with a shaft through hole through which the propeller shaft penetrates, to prevent the propeller shaft from buffering with the engine mount structure and to improve the rigidity of the engine mount structure even if it is made compact vertically.

[0006] Furthermore, there is a technology disclosed in Japanese Patent Application Laid-Open No. 2000-289479. The propeller shaft structure of a vehicle disclosed in this publication is provided with a horizontally mounted engine, a transmission, and a transfer mounted thereon,
A front propeller shaft that transmits driving force is provided on the front side, and a rear propeller shaft that transmits driving force is provided on the rear side.In a propeller shaft structure of a vehicle, a mount bracket that supports the engine on the side frame of the chassis is provided. , A support member that supports the front propeller shaft is provided, and the support member is attached to the mount bracket. This can be dealt with simply by changing the shape of the mount bracket, eliminating the need for using a conventional stay and reducing the number of parts. The cost can be reduced, and there is no need to secure a space for disposing the conventional stay.

[0007] Then, there is one disclosed in JP-A-2000-291623. A propeller shaft structure of a vehicle disclosed in this publication is a propeller shaft structure of a vehicle provided with a transmission connected to an engine mounted on the vehicle and provided with a propeller shaft for transmitting a driving force of the transmission to a differential. , The first side of the transmission side to connect the propeller shaft to the transmission side and the differential side via three joints.
The shaft portion and the second shaft portion on the side of the differential unit are provided in two parts to increase the resonance speed of the propeller shaft, thereby improving the sound and vibration characteristics of the propeller shaft.

[0008]

By the way, in the conventional propeller shaft structure of a vehicle, the two-split type propeller shaft has a constant velocity joint at an intermediate portion, and a flange yoke portion at both ends and an intermediate joint ( (Center support) is generally fastened and fixed.

FIG. 8 shows a propeller shaft structure of a vehicle to be used this time. In FIG. 8, reference numeral 102 denotes a four-wheel drive vehicle, 104 denotes a chassis, 106 denotes front wheels, and 108 denotes a rear wheel. And this chassis 10
The chassis 104 has a body main body (not shown) constituting an upper appearance mounted on the chassis 4, and the chassis 104 includes two first and second side frames 110 extending in the front-rear direction at left and right portions of the four-wheel drive vehicle 102. 112 and a subframe (not shown).

On the front side of the four-wheel drive vehicle 102, left and right first and second mount brackets 114, 1
A vertically mounted engine 118 is mounted via the engine 16 and the transmission 118 is mounted on the engine 118.
0 and the transfer 122, and the transfer 12
2 is supported by the third mount bracket 124.

At this time, a front differential 126 is provided between the front wheels 106, 106 and the rear wheels 10
A rear differential 128 is provided between the positions 8 and 108.

As shown in FIG. 8, a front propeller shaft 130 connecting the transfer 122 and the front differential 126 is provided for transmitting the driving force to the front side of the four-wheel drive vehicle 102.
In order to transmit the driving force to the rear side of the wheel drive vehicle 102, a rear propeller shaft 132 that connects the transmission 120 and the rear differential 128 is provided.

Further, the front propeller shaft 13
The center support 134 is provided on the first mount bracket 114 that supports the left side of the engine 118.

At this time, the front propeller shaft 130 has a first front propeller shaft 130-1 communicating with the transfer 122 side, and a front differential 126
Front propeller shaft 130-2 to contact side
The center support 134 supports the portion behind the connecting portion of the first and second front propeller shafts 130-1 and 130-2, that is, the middle of the first front propeller shaft 130-1.

The engine 118 is, as shown in FIG.
Left and right first and second mount brackets 114 and 116 are supported in an inclined state, and the left first mount bracket 114 is connected to the frame side left mount bracket 136 connected to the first side frame 110 and a first mount rubber. A member 138 and an engine-side left mount bracket 140 communicating with the engine 118 are provided. The right second mount bracket 116 is connected to the frame-side right mount bracket 142 communicating with the second side frame 112 and a second mount rubber member. 144 and an engine-side right mount bracket 146 that communicates with the engine 118.

Then, the first mount rubber member 138
The center support 134 is attached to the engine-side left mounting bracket 140 located between the engine and the engine 118.

This center support 134 is shown in FIG.
As shown in (a) and (b), a mounting bracket portion (also simply referred to as “mounting bracket”) 134-1 and a support outer ring portion 134 disposed on an inner peripheral surface portion of the mounting bracket portion 134-1. -2, a rubber mount part 134-3 disposed on the inner peripheral surface of the support outer ring part 134-2,
A support inner ring portion 134-4 disposed at an inner peripheral surface portion of the rubber mount portion 134-3; and a support inner ring portion 134-4.
And a bearing portion 134-5 disposed on the inner peripheral surface of the bearing.

The mounting bracket 134-1 of the center support 134 is formed in an inverted U-shape as shown in FIG. 10B, and the first and second mounting arms 134-1a extend outward. , 134-1b are formed with mounting holes (not shown).

Further, as shown in FIG. 9, the engine-side left mounting bracket 140 includes a bracket body 140-1 extending from the engine side to the frame-side left mounting bracket 136, and two brackets for mounting the center support 134. Arm portions 140-2 and 140-3. The arms 140-2 and 140-3 are, as shown in FIG.
The bracket body 140-1 is formed so as to protrude from both sides toward the center support side of the intermediate portion from the lower side.

Reference numeral 148 denotes arms 140-2 and 140-3 of the engine-side left mount bracket 140.
Mounting bracket 134-1 of center support 134
Mounting bolts for mounting the first and second mounting arms 134-1a and 134-1b.

Then, the front propeller shaft 130
Is located between the transfer 122 and the front differential 126, and the center support 134 is fastened to the engine-side left mounting bracket 140 with two mounting bolts 148.

The engine-side left mount bracket 140 has a role of fixing the engine 118 to the first side frame 110 of the chassis 104 via the first mount rubber member 138 at the end.
The engine vibration is directly picked up because the engine vibrations are fastened to the 18 side in a state of high rigidity (also referred to as “rigid connection”).
0 may vibrate violently, and the center support 134 rigidly connected to the engine-side left mount bracket 140 may cause similar vibration.

In particular, since the fixed portion of the center support 134 is on the lower side, as shown in FIGS. 10 (a) and 10 (b),
There is an inconvenience that the center support 134 may be broken due to the occurrence of tilting vibration in the front-rear direction.

As shown in FIG. 11, the front propeller shaft 130 is attached to the four-wheel drive vehicle 102 with four points on the front side, four points on the rear side, and two points on the intermediate part. In order to perform the mounting work by one worker, a member having a temporary holding function such as a jig or a temporary holding stay is separately required, and welding is performed only for the mounting work. There is a problem that the cost increases, and the improvement has been desired.

[0025]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention provides a vertically mounted engine, a transmission and a transfer mounted on a vehicle and transmits a driving force to a front side. A propeller shaft is provided, a rear propeller shaft for transmitting a driving force to the rear side is provided, and a center support for supporting an intermediate portion is provided for the front propeller shaft, and the center support is provided for supporting the engine on a side frame of a chassis. In the structure of the propeller shaft of the vehicle fixed to the mount bracket, the center support is fixed to the lower portion of the mount bracket via first and second mounting members provided to sandwich the lower portion of the outer periphery of the center support. A third mounting portion provided at a position vertically separated from the member upward Through, characterized in that fixing the center support to the mounting bracket upper.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION
A total of 3 points including two points at both ends of the mounting bracket of the center support and one point of the third fixed surface at a position apart from the two points.
While supporting the center support at the tightening points,
By installing the fixing surface of the center support in the direction to suppress the vibration of the center support, the mounting strength of the center support is improved compared to the conventional center support that can be tightened at two points,
In the conventional center support, the problem that the center support vibrates around a line connecting two points as an axis and leads to breakage is solved.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 4 show a first embodiment of the present invention. In the first embodiment, the parts performing the same functions as those of the above-described prior art are denoted by reference numerals “10”.
"0" is subtracted and used.

1 to 4, reference numeral 30 denotes a front propeller shaft, reference numeral 34 denotes a center support, and reference numeral 40 denotes an engine-side left mount bracket.

The center support 34 supports an intermediate portion of the front propeller shaft 30 and a mounting bracket 34-1 having the center support 34 provided on the outer periphery.
, An engine (not shown) is supported by the engine-side left mount bracket 40, which is a mount bracket for supporting a side frame (not shown) of a chassis (not shown).

At this time, as shown in FIGS. 1 and 2, the center support 34 includes a mounting bracket 34-1 and a support outer ring portion 34-disposed on an inner peripheral surface of the mounting bracket 34-1. 2, a rubber mount portion 34-3 disposed at an inner peripheral surface portion of the support outer ring portion 34-2, and a support inner ring portion 34- disposed at an inner peripheral surface portion of the rubber mount portion 34-3. 4 and a bearing part 34-5 disposed on the inner peripheral surface of the support inner ring part 34-4.

As shown in FIGS. 1 and 2, the mounting bracket 34-1 of the center support 34 is formed in an inverted U-shape, and the first and second mounting arms 34 extending outward.
-1a and 34-1b are provided with mounting holes 34-6, respectively.

Further, as shown in FIGS. 3 and 4, the engine-side left mount bracket 40 includes a bracket body 40-1 extending from the engine side to the frame-side left mount bracket side (not shown), and the center support. 34
And two arm portions 40-2 and 40-3 for attaching the arm. As shown in FIGS. 3 and 4, the arms 40-2 and 40-3 are formed to protrude from both sides of the lower part of the bracket body 40-1 to the center support side of the intermediate portion.

Reference numeral 48 denotes first and second mounting arms 34-1a and 34-1a of the mounting bracket 34-1 of the center support 34 on the arms 40-2 and 40-3 of the engine-side left mounting bracket 40. -1b.

The front propeller shaft 30 is located between a transfer (not shown) and a front differential (not shown).
The first and second mounting arms 34-1a and 34-1b are fastened to the engine-side left mount bracket 40 with two mounting bolts 48.

At this time, as shown in FIGS. 1 and 2, the outer periphery of the center support 34 has first and second mounting arms 3.
A third mounting member 52 formed in a U-shape is provided at a position vertically apart from 4-1a and 34-1b, and the third mounting member 52 is provided with a pair of support walls 54 arranged in parallel. ,
One end of 56 is connected to the center support 34, and is fixed to the engine-side left mount bracket 40 as a mount bracket via a third fixing surface 58 connecting the other ends of the support walls 54, 56. Configuration.

More specifically, as shown in FIGS. 1 and 2, the outer periphery of the center support 34 and the center support 34
The third mounting member 52 is fixed by welding so that the third mounting member 52 is in contact with the upper position of the third mounting member.

At this time, as shown in FIGS. 1 and 2, the third mounting member 52 is provided with a bolt 60 projecting from the third fixing surface 58.

As shown in FIGS. 3 and 4, in the contact surface on the engine-side left mount bracket 40 side facing the third fixing surface 58, that is, on the bracket main body 40-1 of the engine-side left mount bracket 40. An elongated hole 64 is formed and provided in a vertical surface 62 located on the rear side and orthogonal to the front propeller shaft 30.

Reference numeral 66 denotes a nut that engages with the bolt 60 formed on the third fixed surface 58.

Next, the operation will be described.

When attaching the center support 34 to the engine-side left mount bracket 40, the third fixing surface 5
8 can be temporarily held when the front propeller shaft 30 is assembled by fitting the bolts 60 protruding from the front propeller shaft 8 into the elongated holes 64 formed in the vertical surface 62 of the bracket body 40-1 of the engine-side left mount bracket 40. it can.

Then, after the front propeller shaft 30 is temporarily held, the mounting bracket 3 of the center support 34 is mounted.
4-1, the first and second mounting arms 34-1a and 34-1b are fastened to the engine-side left mounting bracket 40 with two mounting bolts 48, and the first and second mounting arms 34-1a and 34-1b are fastened to the bolt 60 formed on the third fixing surface 58. The nut 66 is fastened.

Thus, the first and second mounting arms 34-1 of the mounting bracket 34-1 of the center support 34.
The center support 34 is supported at a total of three tightening points including two points a and 34-1b and one point of the bolt 60 formed on the third fixing surface 58 at a position separated from the two points, By installing the third fixing surface 58 in the direction of suppressing the vibration of the center support 34, the mounting strength of the center support 34 can be improved as compared with the conventional center support that can be tightened at two points. In this case, it is possible to solve the problem that the center support vibrates around the line connecting the two points and causes breakage, which is practically advantageous.

Further, the contact surface on the engine-side left mount bracket 40 side facing the third fixing surface 58, that is, the bracket main body 40-1 of the engine-side left mount bracket 40, is located on the rear side and front. By forming an elongated hole 64 in the vertical surface 62 perpendicular to the propeller shaft 30, the bolt 60 protruding from the third fixing surface 58 can be used for the bracket body 40-of the engine-side left mounting bracket 40. If it fits into the long hole 64 formed in the first vertical surface 62, the third hole provided for improving the strength is formed.
Bolt 60, which is a tightening point of the front propeller shaft 30, can function as a temporary holding member when the front propeller shaft 30 is assembled.
The assembly workability can be improved, a dedicated temporary holding member is not required, the number of parts can be reduced, and an inexpensive structure can be achieved.

Further, in the bracket body 40-1 of the engine-side left mount bracket 40, an elongated hole 64 is formed in a vertical surface 62 located on the rear side and orthogonal to the front propeller shaft 30. This facilitates the insertion of the bolt 60, which is the third tightening point, and enables fine adjustment of the tightening position of the bolt 60 when supporting the center support 34 at a total of three tightening points. This is possible and practically advantageous.

FIG. 5 shows a second embodiment of the present invention. In the second embodiment, parts that perform the same functions as those in the first embodiment will be described with the same reference numerals.

In the first embodiment, the third mounting member 52 is fixed by welding so as to be in contact with the outer periphery of the center support 34 and the upper position of the center support 34. Is characterized in that the third mounting member 72 is provided not at the upper position of the center support 34 but at a lateral offset from the upper position.

That is, when the third mounting member 72 is provided, as shown in FIG.
The center support 34 is fixed by welding so as to contact at a position offset laterally from the upper position, that is, at a position close to the second mounting arm 34-1b of the mounting bracket 34-1 of the center support 34. It is.

Further, a bolt 76 is provided so as to protrude from the third fixing surface 74 of the third mounting member 72, and the engine-side left mount bracket 40 facing the third fixing surface 74.
5, that is, a vertical surface 78 located on the rear side and orthogonal to the front propeller shaft 30 in the bracket body 40-1 of the engine-side left mount bracket 40, as shown in FIG. An elongated hole 80 is formed and provided.

In the second embodiment, the position at which the third mounting member 72 is provided is defined by the upper position of the center support 34 and the second mounting arm 34-1b of the mounting bracket 34-1 of the center support 34. Although it was set at the intermediate position, assembly workability and center support 3 when functioning for temporary holding
The position can be set in consideration of the mounting strength of No. 4.

This is effective in a situation where the third mounting member 72 cannot be provided on the outer periphery of the center support 34 and at a position in contact with the upper portion of the center support 34 in terms of layout. Bolt 76, which is the tightening point of the front propeller shaft 30,
Can be functioned as a temporary holding member at the time of assembling, the assembling workability can be improved, and a dedicated temporary holding member becomes unnecessary, the number of parts can be reduced, and an inexpensive structure can be obtained.

It should be noted that the present invention is not limited to the above-described embodiment, and various application modifications are possible.

For example, in the first embodiment of the present invention, the outer periphery of the Santa support 34 and the center support 3
Although the third mounting member 52 is provided at an upper position of the center support 3, the bracket main body 40-1 of the engine-side left mount bracket 40 is formed in a throttle shape to form the center support 3.
It is also possible to adopt a special configuration in which the vibration suppressing member 82 for suppressing the vibration of the fourth is provided.

That is, in the bracket body 40-1 of the engine-side left mount bracket 40, FIG.
As shown in FIG. 7, for example, the front side wall portion 84 is formed in a vertical state, and the rear side wall portion 86 is provided so as to be tapered upward, that is, inclined so as to have a drawing shape, and the inclined rear side wall portion 86 is formed. The vibration suppressing member 8
The upper end of the center support 34 is brought into contact with an intermediate portion of the rear side wall 86 to suppress vibration of the center support 34.

When the center support 34 is inserted from below the bracket body 40-1 of the engine-side left mount bracket 40, the center support 34
The upper end of the center support 34 is brought into contact with an intermediate portion of the rear side wall portion 86 and is fastened by a mounting bolt (not shown), whereby the vibration of the center support 34 can be suppressed, and the problem that the center support vibrates and is damaged can be solved. .

At this time, if the engine-side left mount bracket 40 and the center support 34 do not overlap at the time of mounting, the bracket body 40-1 of the engine-side left mount bracket 40 is moved from the bracket body 40-1 to the center support side. It is also possible to provide an extending arm, and to provide the vibration suppressing member 82 to this arm.

In this modification, the inclined rear side wall portion 86 functions as the vibration suppressing member 82. However, both the front side wall portion 84 and the rear side wall portion 86 are inclined to reduce the vibration It is also possible to function as the member 82.

Further, it is also possible to adopt a special structure in which a vibration suppressing member 92 protruding toward the center support 34 is provided inside the bracket body 40-1 of the engine-side left mount bracket 40.

That is, as shown in FIG. 7, the bracket body 40-1 of the engine-side left mount bracket 40.
First and second projecting pieces 94-1, 9 projecting inward
4-2, and the first and second protruding pieces 94-1, 9 are provided.
4-2 functions as the vibration suppressing member 92.

When the center support 34 is inserted from below the bracket body 40-1 of the engine-side left mount bracket 40, the center support 34
Are positioned between the first and second projecting pieces 94-1 and 94-2, and are fastened by mounting bolts (not shown), whereby vibration of the center support 34 can be suppressed, and the center support vibrates. The problem of breakage can be solved.

[0062]

As described in detail above, according to the present invention, the engine, the transmission and the transfer in the vertically installed state are mounted on the vehicle, and the front propeller shaft for transmitting the driving force to the front side is provided. A rear propeller shaft that transmits driving force is provided on the rear side, a center support is provided on the front propeller shaft to support the middle part, and this center support is fixed to a mount bracket that supports the engine on the side frame of the chassis. In the structure of the propeller shaft, the first, which is provided by sandwiching the lower portion of the outer periphery of the center support,
Since the center support is fixed to the lower part of the mount bracket via the second mounting member and the center support is fixed to the upper part of the mount bracket via the third mounting member provided at a position vertically separated from each mounting member, The center support is supported at a total of three fastening points: two points at both ends of the mounting bracket of the center support and one point on a third fixing surface at a position apart from the two points, and a third fixing point. By installing the surface in the direction that suppresses the vibration of the center support, the mounting strength of the center support can be improved compared to the conventional center support that can be tightened at two points,
In the conventional center support, the disadvantage that the center support vibrates around a line connecting two points and causes breakage can be eliminated, which is practically advantageous.

[Brief description of the drawings]

FIG. 1 is a plan view of a center support showing a first embodiment of the present invention.

FIG. 2 is a front view of a center support.

FIG. 3 is a cutaway front view of a main part with a center support attached to an engine-side left mount bracket.

FIG. 4 is a schematic perspective view showing a state where a center support is attached to an engine-side left mount bracket.

FIG. 5 is a front view of a cutaway view of a main part of a second embodiment of the present invention, with a center support attached to an engine-side left mount bracket.

FIG. 6 is an enlarged sectional view of a main part of a first embodiment of the present invention, in which a center support is engaged with an engine-side left mount bracket.

FIG. 7 is an enlarged sectional view of a main part of a second embodiment of the present invention, in which a center support is engaged with an engine-side left mount bracket.

FIG. 8 is a plan view showing a schematic configuration of a four-wheel drive vehicle showing the prior art of the present invention.

FIG. 9 is an enlarged sectional view taken along line 9-9 in FIG. 8;

10A and 10B show a center support, in which FIG. 10A is a side view of the center support showing a falling vibration state, and FIG. 10B is a front view of the center support.

FIG. 11 is an explanatory view showing an assembled state of a front propeller shaft to a four-wheel drive vehicle.

[Explanation of symbols]

 Reference Signs List 30 front propeller shaft 34 center support 34-1 mounting bracket 34-2 support outer ring part 34-3 rubber mount part 34-4 support inner ring part 34-5 bearing part 34-6 mounting hole part 34-1a first mounting arm Part 34-1b Second mounting arm part 36 Frame side left mounting bracket 40 Engine side left mounting bracket 40-1 Bracket body part 40-2, 40-3 Arm part 48 Mounting bolt 52 Third mounting member 54 First fixing surface 56 Second fixing surface 58 Third fixing surface 60 Bolt 62 Vertical surface 64 Slot 66 Nut

Claims (2)

[Claims] An engine, a transmission, and a transfer in a vertically installed state are mounted on a vehicle, provided with a front propeller shaft for transmitting driving force on a front side, and a rear propeller shaft for transmitting driving force on a rear side. A front support shaft provided with a center support for supporting an intermediate portion, and the center support fixed to a mount bracket for supporting the engine on a side frame of a chassis; A third mounting member fixed to the lower portion of the mount bracket via first and second mounting members sandwiching the lower portion, and provided at a position vertically separated from the mounting members;
A propeller shaft structure for a vehicle, wherein the center support is fixed to an upper portion of the mount bracket via a mounting member. 2. A bolt is protrudingly provided on a third fixing surface provided on the center support, and an elongated hole is formed on an abutting surface on the side of the mounting bracket, and the bolt is provided with the bolt. The propeller shaft structure for a vehicle according to claim 1, wherein the propeller shaft is fitted into an elongated hole and temporarily held when the propeller shaft is assembled.