JPH09156535A - Subsidiary frame support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a subsidiary frame support structure in which a subsidiary frame can be rigidly connected to a body to restrict horizontal oscillation of the subsidiary frame to the body by only assembling a separately prepared part onto the subsidiary frame on a vehicle assembling line. SOLUTION: Flat seat surfaces 21a, 21b, and a through hole 20 are formed on bottom parts of recessed places 2a, 2b provided on a subsidiary frame 1, a first spacer 6 comprising a small diameter cylinder part 6a to be inserted into the through hole 20 and a large diameter cylinder part 34 provided with a placement surface 63 to be placed on the seat surface 21a of the recessed place 2a, and a second spacer 7 to be engaged with an outer circumference of the small diameter cylinder part 6a are formed, the small diameter cylinder part 6a is inserted into the through hole 20, a bolt 5b is inserted into a through hole 61 formed in the first spacer 6, the second spacer 7 is inserted into a bolt 5b with play, the second spacer 7 is engaged with the small diameter cylinder part 6a, and a nut 51b is tightened to the bolt 5b, thereby the subsidiary frame 1 is fixed to a body 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a support structure for supporting a subframe on which an engine unit is mounted on a body.

[0002]

2. Description of the Related Art Generally, a sub-frame of this type to be assembled to a body is constructed by joining a pair of upper and lower frame members formed in a hat-shaped cross-section in a closed cross-section as shown in Japanese Utility Model Laid-Open No. 1-138866. Then, each of these frame members is provided with an upper recess and a lower recess that are recessed in a direction in which they approach each other, while a through hole is provided at the center of these both recesses, and a distance piece having a bolt insertion hole, A pair of mount rubbers to be fitted around the distance piece are provided, and the mount rubbers are fitted into the recesses so as to sandwich the frame material, and the bolts to be inserted into the distance piece are tightened. Thus, the sub-frame is elastically supported on the body via the mount rubber, and the drive vibration of the engine is suppressed from being transmitted to the body side.

By the way, in the above sub-frame supporting structure, the sub-frame is elastically supported to the body through the mount rubber. When the vehicle suddenly turns or suddenly starts, the mount rubber bends due to an inertial force acting on the engine unit or an input from a suspension, and the sub-frame moves forward or backward or left and right with respect to the body together with the engine unit. There is a problem that the vehicle swings and the running stability of the vehicle is impaired.

Therefore, in order to solve the above problems, the applicant of the present invention comprises a cylindrical boss portion A and a spacer body portion B integrally formed at one end of the cylindrical boss portion A, as shown in FIG. A cylindrical spacer D formed by forming a bolt insertion hole C from the spacer body B to the cylindrical boss A is provided, and the cylindrical boss A is inserted into the through hole F of the subframe E. , The tubular spacer D is fixed to the recess of the sub-frame E by welding, and the tubular spacer D is inserted into the bolt G through the insertion hole C to obtain the bolt G.
A support structure for the subframe has been proposed in which the subframe E is fixed to the body I through the tubular spacer D by tightening the nut H into the body I. (Japanese Patent Application No. 6-174321)

[0005]

However, with the structure described above, it is difficult to weld the cylindrical spacer D to the subframe E in the middle of the assembly line for assembling the subframe E to the body side. Since,
The cylindrical spacer D must be fixed to the subframe E by welding in advance.

Therefore, in the case of the structure described above, for example, when manufacturing two types of vehicles, that is, a general specification and a sports specification with severe driving conditions, they are not fixed to the subframe to which the cylindrical spacer is fixed before assembly on the assembly line. It is necessary to prepare the subframe in advance, and there is a problem that the number of parts increases correspondingly.

Further, in the case where the tubular spacer D is preliminarily fixed by welding as described above, as shown in FIG. 5, a gap J is formed at the overlapping portion between the tubular spacer D and the sub-frame E, so that the sub When the frame E is painted, the cylindrical spacer D that defines the gap J and the sub-frame E
There is also a problem in that the cylindrical spacer D must be provided with an air bleeding hole K at the time of coating so that the overlapping surface can be surely coated.

The present invention has been developed in view of the above circumstances, and it is an object of the present invention to assemble a subframe on a vehicle assembly line by simply assembling a separately prepared component into the subframe. (EN) A support structure for a subframe, which can be rigidly connected to the subframe and can suppress the subframe from swinging in the horizontal direction with respect to the body.

[0009]

In order to achieve the above object, the present invention is directed to a pair of upper and lower frame members 11 and 12 joined in a closed cross-section, and an upper recess 2a and a lower recess which are recessed in a direction in which they approach each other. A recess 2b is provided, and both recesses 2a
In the support structure of the subframe, the subframe 1 having the through hole 20 at the bottom of b is supported by the body 10 through the bolt 5b protruding from the body 10.
Flat seating surfaces 21a and 21b on the bottoms of the recesses 2a and 2b
And a small-diameter cylindrical portion 6 that is inserted into the through hole 20 while forming the
a and a large-diameter cylindrical portion 6b having a mounting surface 63 that can be mounted on the seat surface 21a of the upper recess 2a, and the bolt 5b is inserted from the large-diameter cylindrical portion 6b into the small-diameter cylindrical portion 6a. Hole 61
And a contact surface 71 for contacting the seat surface 21b of the lower recess 2b, and the small-diameter cylindrical portion 6a.
A cylindrical second spacer 7 that can be fitted to the outer periphery of
The small-diameter cylindrical portion 6a of the first spacer 6 is inserted into the through hole 20, and the mounting surface 63 of the large-diameter cylindrical portion 6b is mounted on the seat surface 21a of the upper recess 2a. 6, the second spacer 7 is loosely inserted into the insertion end portion of the bolt, and the second spacer 7 is fitted into the small-diameter cylindrical portion 6a. The subframe 1 is fixed to the body 10 through the first spacer 6 and the second spacer 7 by tightening the nut 51b into the body 10.

[0010]

According to the present invention, on the vehicle assembly line, the small-diameter cylindrical portion 6a of the first spacer 6 is inserted into the through hole 20 of the sub-frame 1, and the mounting surface 6 of the large-diameter cylindrical portion 6b is inserted.
3 is placed on the seat surface 21a of the upper recess 2a, the bolt 5b protruding from the body is inserted into the insertion hole 61 of the first spacer 6, and the second spacer is attached to the insertion end of the bolt 5b. 7 is loosely inserted, and the second spacer 7 is inserted into the small-diameter cylindrical portion 6
The sub-frame 1 can be rigidly connected to the body 10 through the first spacer 6 and the second spacer 7 by fitting the nut 51b to the bolt 5b and fitting the bolt 5a to the vehicle. It is possible to prevent the sub-frame 1 from swinging back and forth or left and right with respect to the body b at the time of a sudden turn or a sudden start.

Further, according to the present invention, since the first spacer 6 is mounted on the flat seating surface 21a of the upper recess 2a via the mounting surface 63, the first spacer 6 is arranged.
Can be stably set in the upper recess 2a, and the small-diameter cylindrical portion 6a of the first spacer 6 can be inserted into the through hole 20.
Since the first spacer 6 is inserted into the upper recess 2a, the first spacer 6 does not inadvertently separate from the upper recess 2a, and therefore the subframe can be smoothly assembled to the body as a whole.

Further, according to the present invention, both the spacers 6
7 does not have to be welded to the subframe 1 in advance,
Therefore, for example, even in the case of manufacturing two types of vehicles, a general type and a sporting type with severe driving conditions, it is sufficient to prepare one type of sub-frame, and each spacer has the same structure as the conventional type when painting. Since it is not necessary to provide an air vent hole, the manufacturing cost is reduced accordingly.

[0013]

3 and 4 schematically show a state in which an engine unit E is mounted on a subframe 1 supported by a front body 10 of an automobile.
The sub-frame 1 includes a front frame portion 1a, a rear frame portion 1b, and a pair of left and right side frame portions 1c connecting both sides of the frame portions 1a and 1b in the length direction.
And the front frame portion 1a and the rear frame portion 1b
Center frame part 1d installed between middle parts in the length direction
And each of the members constituting the sub-frame 1 is a pair of upper and lower frame members 1 having a hat-shaped cross section.
1 and 12 are joined so as to have a closed cross section, and the engine unit E is mounted on the subframe 1 via a plurality of mount members M.

Further, the both frame members 11 and 12 constituting the front frame portion 1a and the rear frame portion 1b.
The upper and lower recesses 2a and the lower recesses 2b, which are recessed toward each other, are provided at both ends in the longitudinal direction of the, and flat seat surfaces 21a and 21b are formed on the bottoms of these recesses 2a and 2b. , A circular through hole 20 in the center of the seat surface 21a, 21b
Is formed.

By the way, when the above sub-frame 1 is applied to a vehicle having general specifications, as shown in FIG.
Normally, the distance piece 3 having a bolt insertion hole is inserted into the through hole 20, and the distance piece 3
The rubber upper and lower mount rubbers 4a and 4b are inserted into the outer peripheries of both ends of the above, and the mount rubbers 4a and 4b are set in the respective recesses 2a and 2b, and then the bolt 5a attached to the body 10 side, Insert it into the distance piece 3,
The sub-frame 1 is elastically supported by the body 10 via the upper and lower mount rubbers 4a and 4b by screwing the nut 51a into the insertion end portion. In FIG. 2, 31 is a washer.

In the embodiment shown in FIG. 1, however, the sub-frame 1 having the above-mentioned structure is applied to, for example, a sports type vehicle, in which a separately formed metal first spacer 6 and By using the second spacer 7,
The sub-frame 1 is supported by the body 1.

Specifically, the first spacer 6 comprises a cylindrical small-diameter cylindrical portion 6a and a large-diameter cylindrical portion 6b integrally formed at the shaft end of the small-diameter cylindrical portion 6a. 6a
Since the insertion hole 61 of the bolt 5b protruding from the body 10 is formed in the large-diameter cylindrical portion 6b, the small-diameter cylindrical portion 6a can be inserted into the through hole 20, and The inner peripheral surface of the insertion hole 61 on the side of the diameter cylindrical portion 6b is made into a mortar-shaped guide surface 61a that expands upward, and the lower surface of the large diameter cylindrical portion 6b has a seat surface of the upper recess 2a. 21a is provided with a flat mounting surface 63 that can be mounted.

The small-diameter cylindrical portion 6a is composed of the first spacer 6
Is set in the upper recess 6a, and the large-diameter cylindrical portion 6b is
The lower end of the small-diameter cylindrical portion 6a is made to project into the lower recess 2b by a predetermined length when the mounting surface 63 is mounted on the seat surface 21a. Thus, the first spacer 6 is prevented from being accidentally detached from the upper recess 6a when the subframe is assembled.

On the other hand, the second spacer 7 is formed in a cylindrical shape that can be fitted to the outer circumference of the small diameter cylindrical portion 6a, and has a flat end which is in contact with the seat surface 21b of the lower recess 2b at the shaft end. A contact surface 71 and a flat receiving surface 72 that receives the collar portion 54 of the nut 51b are provided.

The bolt 5b shown in FIG. 1 bulges outward in the radial direction in the middle of the length direction to provide a bulge portion 52 for locking a washer 53, which will be described later, and to the upper end side of the bolt 5a. By inserting a wide washer 53 into the above, the washer 53 is received by the bulging portion 52, and the upper end side of the bolt 5 is screwed to the nut 50 fixed to the body 10, The bolt 5 is fixed to the body 10.

Before assembling the subframe 1 to the body 10, the subframe 1 is coated and the first and second spacers 6 and 7 are plated. Therefore, it is not necessary to form air vent holes in the spacers 6 and 7 as in the conventional case.

Then, the subframe 1 is replaced with the first subframe.
In order to support the body 1 using the spacers 6 and the second spacers 7, first, the small-diameter cylindrical portion 6a of the first spacer 6 is inserted into the through hole 20 from above the sub-frame 1 so that the large-diameter The mounting surface 63 of the tubular portion 6b is connected to the upper recess 2a.
The first spacer 6 is set in the upper recess 2a by placing the first spacer 6 on the seat surface 21a.

Then, after the bolt 5b is inserted into the insertion hole 61 of the first spacer 6, the second spacer 7 is loosely inserted into the insertion end portion of the bolt 5b, and the second spacer 7 is The nut 51b is screwed to the free end of the bolt 5b while being fitted to the outer periphery of the small diameter cylindrical portion 6a protruding into the lower recess 2b. Thus, as the nut 51b is tightened, the collar portion 54 of the nut 51b contacts the receiving surface 72 of the second spacer 7, and the seat surface 21b of the lower recess 2b contacts the second spacer 7. The surfaces 71 are in pressure contact with each other, the mounting surface 63 of the first spacer 6 is on the seat surface of the upper recess 2 a, and the upper end surface of the first spacer 6 is on the body 10 via the washer 53.
The sub-frame 1 is fixed to the body 10 as shown in FIG.

By the way, at the time of the above work, since the mortar-shaped guide surface 61a is formed on the inner peripheral surface of the upper portion of the insertion hole 61, the diameter of which is increased upward. 5b can be easily inserted,
Further, since the first spacer 6 is mounted on the flat seating surface 21a of the upper recess 2a through the mounting surface 63, the first spacer 6 can be stably placed in the upper recess 2a. Can be set to the small diameter cylinder portion 6 of the first spacer 6
Since a penetrates the through hole 20 and the free end thereof projects into the lower recess 2b, there is no problem that the first spacer 6 is inadvertently separated from the upper recess 2a.
Therefore, the work of assembling the subframe to the body can be performed smoothly.

Thus, the sub-frame 1 supported as described above is rigidly connected to the body 10 via the first and second spacers 6 and 7, so that when the vehicle turns suddenly or suddenly starts. At this time, the sub-frame 1 does not swing back and forth or left and right with respect to the body 10, so that the running stability of the vehicle is maintained.

[0026]

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view of a sub-frame that is supported by a body via first and second spacers and a supporting portion of the body.

FIG. 2 is an enlarged cross-sectional view of a sub-frame supported by a body via a pair of mount rubbers and a supporting portion of the body.

FIG. 3 is a schematic side view of a subframe.

FIG. 4 is a schematic plan view of a subframe.

FIG. 5 is an enlarged cross-sectional view of a conventional supporting portion between a subframe and a body.

[Explanation of symbols]

1 Sub-frame 63 Mounting Surface 11/12 Frame Material 7 Second Spacer 2a Upper Recess 71 Contact Surface 2b Lower Recess 10 Body 20 Through Hole 5b Bolt 21a Seat 51b Nut 21b Seat 6 First Spacer 6a Small Diameter Tube Part 6b Large-diameter cylindrical part 61 Insertion hole

Claims (1)

[Claims] 1. A pair of upper and lower frame members (11) and (12) joined in a closed cross-section, the frame members (1)
1) (12) is provided with an upper recess (2a) and a lower recess (2b) which are recessed toward each other, and a through hole (20) is provided at the bottom of both recesses (2a) (2b). The subframe (1) is supported by the body (10) via bolts (5b) projecting from the body (10).
a) A flat seating surface (21a) (21b) is formed on the bottom of (2b), while a small diameter cylindrical portion (6a) inserted into the through hole (20) and a seating surface of the upper recess (2a). And a large-diameter tubular portion (6b) having a placement surface (63) that can be placed on (21a).
a) is provided with a first spacer (6) having an insertion hole (61) for the bolt (5b), and an abutment surface (71) abutting against a seat surface (21b) of the lower recess (2b), A tubular second spacer (7) that can be fitted to the outer periphery of the small diameter tubular portion (6a) is formed, and the small diameter tubular portion (6a) of the first spacer (6) is provided in the through hole (20). Then, the mounting surface (63) of the large-diameter cylindrical portion (6b) is mounted on the seat surface (21a) of the upper recess (2a), and the insertion hole (61) of the first spacer (6) is inserted. ), The second spacer (7) is loosely inserted into the insertion end of the bolt, and the second spacer (7) is fitted into the small-diameter tubular portion (6a). Then, by tightening the nut (51b) into the bolt (5b), the sub frame is inserted through the first spacer (6) and the second spacer (7). The support structure of a sub-frame, characterized in that beam (1) was to be fixed to said body (10).