JPH0532169A - Steering rack mounting structure - Google Patents

Abstract

PURPOSE:To provide a steering rack mounting structure which enables the steering rack to be located in a position lower and ahead more than in any conventional arrangement. CONSTITUTION:A steering rack 11 is installed on a sub-frame 17 located below a bracket 19 and between the rear wall 5a of transmission 5 and a rear mount member 18, which enables shifting the steering rack 11 to a position lower and ahead more than in any conventional arrangement. This enhances the steering efficiency and the sense of steering and also favors such traits as stability in high speed straight running and the cornering characteristics.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering rack mounting structure.

[0002]

2. Description of the Related Art A conventional steering rack mounting structure is disclosed in "Toyota Celica Repair Manual" pages 8-49 issued by Toyota Motor Corporation in September 1989, or as shown in FIG. 3, for example. It has been known.

Reference numeral 1 is a first cross member, 2 is a sub-frame, both of which are structural members having both ends attached to left and right front side members (not shown). 3 is a center member, the front part of which is attached to the first cross member 1 and the rear part of which is attached to the sub-frame 2. An engine 4 and a transmission 5 integrated with the engine 4 are installed on the center member 3. The engine 4 and the transmission 5 are attached to the vehicle body by a plurality of mounting members. For example, the front side of the engine 4 is attached to the front mount member 22 on the center member 3. In addition, a bracket 6 is provided on the lower portion of the rear wall 5a of the transmission 5.
Is provided and the rear end of the bracket 6 is attached to the rear mount member 7 fixed on the center member 3.

A dash lower panel 8 for partitioning the engine room E and the vehicle interior space R is provided above the sub-frame 2. The lower part of the dash lower panel 8 is inclined toward the vehicle interior space R side. It is a part 8a. The lower part of the inclined portion 8a is a so-called dead space D, and no special equipment or equipment is arranged.

Further, at the lower end (above the inclined portion 8a) of the vertical wall portion of the dash lower panel 8, the gusset 9 is provided.
Is fixed, and a steering rack 11 is attached to this gusset 9 via a fixing metal fitting 10. A vibration isolator 12 is interposed between the steering rack 11 and the fixture 10. Reference numeral 13 denotes a steering gear, which is engaged with the steering rack 11,
The operating force from the steering wheel 14 is transmitted to the steering rack 11. In addition, S is a wheel center (center of the tire T), and 15 is a radiator.

[0006]

However, in such a conventional technique, the position of the steering rack 11 is relatively high, which is disadvantageous in terms of high-speed straight running stability and turning performance.

Further, since the distance L ₁ between the wheel center S and the steering rack 11 is large, the bending angle of a tie rod (not shown) attached to the end of the steering rack 11 becomes large, and the steering efficiency and steering feeling are degraded. May be caused.

Further, since the distance L ₁ is large, it is difficult to move the dash lower panel 8 forward to expand the vehicle interior space R.

In order to solve such a problem, even if the position of the steering rack 11 is moved downward and forward, the steering rack 11 will interfere with the rear mount member 7 and the like with the conventional structure. It is impossible to do so.

The present invention has been made by paying attention to such a conventional technique, and provides a mounting structure for a steering rack which allows the steering rack to be positioned lower and forward than the conventional structure.

[0011]

In order to achieve the above object, the steering rack mounting structure according to the present invention has a rear mount member fixed immediately after a rear wall of a transmission integrated with an engine. A sub frame is provided, and a bracket is extended rearward from an upper portion of the transmission rear wall, and a rear end of the bracket is attached to the rear mount member, and the bracket is provided between the transmission rear wall and the rear mount member. A steering rack is mounted on a sub-frame located below the bracket.

[0012]

Since the steering rack is mounted on the sub-frame located between the rear wall of the transmission and the rear mount member and below the bracket, the position of the steering rack is moved downward and forward as compared with the conventional case.
That is, the bracket is extended rearward from the upper portion of the rear wall of the transmission, and a small space is formed below the bracket and between the rear wall and the rear mount member. It was done. Even if the rear mount member, the steering rack, etc. are centrally arranged just behind the rear wall in this way, this part corresponds to a dead space part due to the inclined part below the dash lower panel, which causes a space problem. There is no.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to FIGS. The same parts as those in the prior art will be designated by the same reference numerals, and overlapping description will be omitted.

The center member 16 according to this embodiment is shorter than the conventional one, and the position of the sub-frame 17 is also moved forward accordingly, and is located just behind the rear wall 5a of the transmission 5. .. Further, a rear mount member 18 having a height higher than that of a conventional one is fixed to a rear portion of the sub-frame 17, and the rear mount member 18 extends rearward from an upper portion of the rear wall 5a as compared with a conventional one. The bracket 19 in the closed state is attached.

The engine 4 in this embodiment is horizontally arranged in the engine room E, and the engine 4
A shaft 21 is provided rearward from the transmission 5 and the transfer 20 that are integrated with each other to form a four-wheel drive (4WD). And this engine 4
The front side of the front mount member 2 on the center member 16
2, the left transmission 5 is mounted on the side mount member 24 of the left front side member 23, and the right side of the engine 4 is mounted on the side mount member 26 of the right front side member 25, and, as a result, The arrangement of the mount members 22, 24, 26, 18 for supporting the engine 4 and the transmission 5 including the rear mount member 18 described above is
The so-called "cross arrangement" is provided, and a reliable support structure is achieved. Further, both ends of the sub-frame 17 and the front part of the center member 16 are attached by a soft mount M via an insulator so that vibration from the tire T is not transmitted to the vehicle body.

Then, the fixing bracket 2 is mounted on the sub-frame 17.
The steering rack 11 is attached by 7.
Is. An insulator 12 is interposed between the steering rack 11 and the fixing bracket 27 as in the conventional case to further secure the vibration damping performance. As shown in FIG. 1, the steering rack 11 includes the rear wall 5a of the transmission 5 and the rear mount member 1.
8 is attached to the dash lower panel 28 while passing below the bracket 19, and the position thereof is lower and forward than in the conventional case where the dash lower panel 28 is attached.

A transfer ring gear 31 is arranged on the transfer 20 and the transmission 5
The driving force obtained from the above is transmitted to the transfer ring gear 31 via a chain belt (not shown). A transfer pinion gear 32 is meshed with the transfer ring gear 31, and the shaft 21 fixed to the transfer pinion gear 32 is connected to a pinion shaft 36 via flanges 33, 34 and a joint 35.
Here, the ground height of the center line H ₂ of the pinion shaft 36 connected to the transfer pinion gear 32 is greater than the ground height of the differential gear center line H ₁ located at the center of the transfer ring gear 31, by the distance α.
Both lines H ₁ and H ₂ are set to be offset so that they are only on the upper side.

Therefore, as compared with the conventional case, the wheel center S
And the distance L ₂ between the steering rack 11 and
As a result, the angle formed by the steering rack 11 and the tie rod 29 (the tie rod bending angle) θ ₁ becomes smaller and the angle θ ₂ formed by the knuckle arm 30 and the tie rod 29 becomes larger accordingly, so that the steering efficiency and steering feeling are improved. To do.

Further, the steering rack 1 is different from the conventional one.
Since the position of 1 is lowered, it is also advantageous in terms of high-speed straight running stability and turning performance.

Further, as described above, since the distance L ₂ between the wheel center S and the steering rack 11 is small, the dash lower panel 28 of this embodiment is moved forward by that amount as compared with the conventional dash lower panel 8. Therefore, the vehicle interior space R is expanded. Even when the dash lower panel 28 is moved forward as described above, the steering rack 11 and the rear mount member 18 are located in the space D, which is a dead space in the past, at the inclined portion 28a below the dash lower panel 28, and therefore the dash is performed. There is no risk that the lower panel 28 will interfere with the rear mount member 18 or the like.

In addition, since the steering rack 11 is directly mounted on the sub-frame 17, the mounting rigidity of the steering rack 11 is high, the steering feeling is improved, and sound vibration countermeasures (vibration and vibration noise are suppressed). ) Is also excellent.

[0022]

The mounting structure of the steering rack according to the present invention has the contents described above.
Since the steering rack is mounted on the sub-frame located between the rear wall of the transmission and the rear mount member and below the bracket, the position of the steering rack can be moved downward and forward as compared with the conventional case.
Therefore, the steering efficiency and steering feeling are improved, and
It is also advantageous in terms of high-speed straight running stability and turning performance.

Further, by moving the position of the steering rack forward, the dash lower panel is moved forward,
It is also possible to expand the vehicle interior space.

Further, since the steering rack is directly mounted on the sub-frame, the mounting rigidity of the radiator rack is increased, the steering feeling is improved, and sound vibration countermeasures (vibration and suppression of vibration noise) are excellent.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a mounting structure of a steering rack according to an embodiment of the present invention.

FIG. 2 is a plan view seen from a DA direction shown by an arrow in FIG.

FIG. 3 is a schematic side view showing a conventional steering rack mounting structure.

[Explanation of symbols]

 5 Transmission 5a Rear wall of transmission 11 Steering rack 17 Subframe 18 Rear mount member 19 Bracket E Engine room R Vehicle interior space

Claims (1)

Claim: What is claimed is: 1. A subframe, to which a rear mount member is fixed, is provided immediately after a rear wall of a transmission that is integrated with an engine, and a bracket is provided rearward from an upper portion of the rear wall of the transmission. A rear end of the bracket is attached to the rear mount member, and a steering rack is attached on a sub-frame located between the rear wall of the transmission and the rear mount member and below the bracket. Characteristic steering rack mounting structure.