JPH10152060A - Steering device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the rigidity of a housing which stores a power transmission device between a steering wheel and a transmission. SOLUTION: A gate-shaped frame which involves a top plate part and a pair of leg plate parts 15R, 15L hanging from both ends of the top plate part is formed on the top surface of the housing 10 which stores a power transmission device positioned between an engine and a transmission and interlockingly- connecting both of them. A steering wheel column 5 which stores a steering wheel shaft 20 in it is fitted at the top surface of the top plate part, and a conversion device which is connected to the steering wheel shaft and converts the rotational movement of the steering wheel shaft into the revolving movement of steering wheels is fitted at the bottom surface of the top plate part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reinforces a housing for covering a power transmission device such as a main clutch and a damper between an engine and a transmission, and further includes a handle column accommodating a handle shaft and a rotational movement of the handle shaft. The present invention relates to a technique for rationally arranging a conversion device for converting a steering wheel into a turning motion.

[0002]

2. Description of the Related Art Conventionally, a lower portion of a cylindrical handle column in which a handle shaft is rotatably housed is fixed to a support bracket, and the rotation of the handle shaft is converted to hydraulic oil according to the amount of rotation on the lower surface of the support bracket. A technique for supporting a steering unit in which the upper surface of a control unit that feeds oil to a hydraulic cylinder provided on a steered wheel is fixed is known. For example, Japanese Patent Application Laid-Open No. 7-10014 discloses a technique.

[0003]

In the above prior art, the support bracket for fixing the lower portion of the handle column and the upper surface of the control unit has a plate-like shape and extends from a panel frame provided inside the dashboard. Therefore, it is cantilevered, has low rigidity, and the upper part of the handle column is also supported and fixed by the panel frame, so the support position tends to be biased to the upper part, poor stability, easy to generate vibration In addition, the supporting member is not used for the reinforcing member of the clutch housing.

[0004]

Means for Solving the Problems The present invention is configured as follows to solve the above-mentioned problems. That is, on the upper surface of the housing that houses the power transmission device interposed between the engine and the transmission and interlocking the two,
An upper plate portion and a portal frame having a pair of leg plate portions hanging down from both ends of the upper plate portion are formed, and a handle column containing a handle shaft therein is provided on the upper surface of the upper plate portion. A conversion device is mounted on the lower surface of the upper plate portion and connected to the handle shaft to convert a rotational motion of the handle shaft into a turning motion of the steering wheel. The conversion device is converted into a telescopic motion of the power steering. Control valve type,
A mounting flange provided at the base of the handle column,
The conversion device is fastened to the case portion of the conversion device via the portal frame.

[0005]

Next, examples will be described. FIG. 1 is a side view of a tractor to which the handle column mounting structure of the present invention is applied, FIG. 2 is a side sectional view of a handle column mounting portion,
FIG. 3 is a side cross-sectional view of the mounting portion at the top of the handle column, and FIG.
FIG. 5 is an exploded perspective view of a handle column, a gate frame, and a conversion device with respect to a housing, FIG. 5 is a hydraulic circuit diagram of a power steering, and FIG. 6 is a side view showing another embodiment of a handle column mounting portion.

In FIG. 1, an engine E is mounted in a bonnet 2 on an engine frame 1 in front of a tractor, a dashboard 3 is disposed at a rear portion of the bonnet 2, and a handle 4 is mounted on the dashboard 3. Are located. The handle 4 is, as shown in FIG.
The upper portion of the handle shaft 20 is rotatably supported via a bearing on the upper portion of a handle column 5 formed in a pipe shape, and the upper portion of the handle column 5 is mounted on an instrument panel 26 on the dashboard 3. Support part 2 erected on the upper surface
7 is fixed. The lower end of the handle shaft 20 is connected to a control shaft 21 of the control unit 16 through a coupling 25 as shown in FIG.

A seat 6 is disposed behind the handle 4, and a transmission case 7 containing a transmission is disposed below the seat 6. A transmission case 7 is provided between an input shaft of the transmission case 7 and an output shaft of the engine E. Is provided with a main clutch constituting a power transmission device, and the main clutch is housed in a clutch housing H located between a rear portion of the engine E and a front portion of the transmission case 7. The housing H has a drum-shaped housing portion 9 and a mid-housing portion 10 connected to each other.

A front wheel 12 is supported below the engine frame 1, and the front wheel 12 is driven to rotate left and right by a power steering cylinder 13 provided on a front axle case. A rear wheel 14 is supported on both sides of the transmission case 7 via a rear axle case.
The power from the engine E is shifted by the transmission case 7 to drive the front wheels 12 and the rear wheels 14.
A step 11 is provided at substantially the center of the side of the mid-housing section 10 in the vertical direction, and a step 11 is provided to increase the rigidity of a continuous portion between the front section of the mid-housing section 10 and the rear section of the drum-shaped housing section 9. The portal form 15 of the invention is arranged.

As shown in FIGS. 2 and 4, the portal frame 15 has an upper plate portion 15U and leg plate portions 15L suspended from both sides thereof.
・ It is made of 15R and has a gate shape when viewed from the front. The front end surfaces of the leg plate portions 15L and 15R are formed along the outer surface shape of the drum housing portion 9 to form extended portions 15La and 15Ra extending in the direction of the engine mounting flange portion 9a, and can be attached by, for example, welding. On the other hand, the leg plate portions 15L and 15R are also skirt portions 15a and 15 which are diagonally outwardly and downwardly expanded according to the shape of the upper surface of the mid housing portion 10.
a is formed so that it can be attached to the upper surface of the mid housing part 10 by, for example, welding.

Therefore, the leg portions 15L and 15L of the gate form 15
In R, by attaching by welding or the like a portion that comes into contact with each of the drum-shaped housing portion 9 and the mid-housing portion 10, the three members reinforce each other to increase the rigidity of the clutch housing H as a whole, and the portal frame 15 itself Is firmly fixed, so that the parts to be attached to the portal form 15 are also stably installed. Xa · X shown in FIG.
b · Xc indicates a welded portion between the drum-shaped housing portion 9 and the mid-housing portion 10 to the portal form 15. Also,
A reinforcing plate 17 is provided laterally over each of the front portions of the leg portions 15L and 15R, or the reinforcing plate 17 is integrally formed with the portal frame 15. In the front loader operation, a high stress acts on the engine mounting flange portion 9a of the drum-shaped housing portion 9, but the leg plate portion 15L of the portal frame 15
The extended portions 15La and 15Ra of 15R serve as reinforcing ribs to relieve high stress and prevent deformation of the drum-shaped housing portion 9.

The upper plate portion 15U is formed so as to be inclined downward and backward so as to match the mounting angle of the handle 4.
A through hole 15c for connecting the handle shaft 20 and the control shaft 21 of the control unit 16 is opened at the center of the upper plate portion 15U, and the handle column 5 and the control unit 16 are mounted around the through hole 15c. Bolt insertion holes 15d and 15e are provided.

That is, in order to attach the handle column 5 to the portal frame 15, a lower end of the handle column 5 is integrally provided with a square mounting flange 5a in a plan view, and four corners of the mounting flange 5a are provided with the upper plate. 15U bolt insertion hole 1
Bolt insertion hole 5b according to the position of 5d
.5b are open. .. Are welded and fixed to the lower surface of the upper plate portion 15U where the bolt insertion holes 15d are located, and the mounting flange 5a is mounted on the upper surface of the upper plate portion 15U to secure the bolt. 23
・ 23 ...

Further, the bolt insertion hole 1 of the upper plate portion 15U is provided.
5e, 15e...
are opened at the top of the control unit 16, and the bolt insertion holes 15e.
Screw holes 16a, 16a,.
・ Is open. Therefore, with the mounting flange 5a attached to the upper plate 15U, the screw holes 16a, 16a... Of the control unit 16 are aligned with the positions of the bolt insertion holes 15e, 15e. The mounting flange 5a, the upper plate 15U, and the control unit 16 are fastened and fixed together by bolts 24.

The control unit 16 is a control valve type converter for converting the rotational movement of the steering wheel 4 into the turning movement of the front wheel 12 via a double-acting hydraulic cylinder 13. Will be described. As shown in FIG. 5, the control unit 16 is a rotary type directional control valve 30.
And a metering pump 31 and a check valve 32. The direction switching valve 30 is a 6-port 3-position switching valve,
0 is provided. Pump port P is control unit 1
6 is connected to a hydraulic pump 33 via a hydraulic pipe 34 (FIG. 2), and a tank port T is opened on the outer surface of the control unit 16 to provide an oil reservoir via a hydraulic pipe 35 and an oil cooler 38. Connected, pump port P
A check valve 32 is interposed between the oil tank and the tank port T.

The output ports LR on the secondary side are opened to the outer surface of the control unit 16 to open hydraulic piping 36.
The output ports 40 and 41 are connected to the power steering cylinder 13 via the 37 and the suction and discharge ports of the metering pump 31. The direction switching valve 30 is biased to a neutral position by springs 42 and 42 and is switched to a left and right operating position in conjunction with the control shaft 21.
Is connected to the direction switching valve 30 on the opposite side of the control shaft 21. The portal form 15
An opening 15b is provided in one of the leg plate portions 15, and each of the pipe joints at the ends of the pipes 34, 35, 36, and 37 is connected to the port P, T, L, and R through the opening 15b.

In such a configuration, when the handle 4 is rotated, the control shaft 21 is rotated via the handle shaft 20 and the coupling 25, and with this rotation, the direction switching valve 30 is moved from the neutral position to the left and right operating positions. And the pressure oil from the hydraulic pump 33 is sent to any oil chamber of the hydraulic cylinder 13 via the metering pump 31 to expand or contract. as a result,
The knuckle arm (not shown) connected to the piston rod of the hydraulic cylinder 13 is turned, and the front wheel 12 makes a turning movement. Then, since the rotation amount of the metering pump 31 is transmitted to the direction switching valve 30 via the feedback system 39, the metering pump 31 returns to the neutral position, and the power steering cylinder 13 expands and contracts by the amount of turning the handle 4, and the expansion and contraction position Is maintained, and the turning angle of the front wheel 12 is also maintained.

As shown in FIG. 6, instead of the control unit 16 as a hydraulic conversion device, a gear box 44 as a mechanical conversion device is used, and the upper plate portion 15U of the portal form 15 is used. It may be attached to the lower surface of.
In this case, the handle shaft 20 is connected to an input shaft (not shown) of the gear box 44 through the upper plate 15U, and a worm gear, a sector gear, or the like is housed in the gear box 44. The output shaft 47 of the leg plate 15
The pitman arm 45 is fixed to the tip of the pitman arm 45, and a link 46 is connected to the pitman arm 45, and the other end of the link 46 is connected to the knuckle arm of the front wheel 12 so as to be mechanical. Alternatively, the rotation of the steering wheel 4 may be changed to the turning motion of the front wheel 12.

The vibration of the engine E is propagated from the housing H to the portal frame 15 to vibrate the handle 4 from the handle shaft 20. If the vibration is unpleasant, the vibration isolating structure shown in FIG. 7 is applied. Can be avoided.
That is, the vibration isolating structure is provided between the upper surface of the upper plate portion 15U of the gate frame 15 and the lower surface of the mounting flange 5a of the handle column 5, and the upper surface of the mounting flange 5a and the bolts 23.
Elastic plates 50, 50 each made of a rubber material or the like are laid between the heads 24. Then, the collar 5 is attached to the bolt 24 for attaching the control unit 16 to the portal form 15.
1 and the bolt insertion hole 5c of the mounting flange 5a,
The inner diameter of the bolt insertion hole 15e of the upper plate portion 15U is
Of the mounting flange 5a and the elastic plate 5
0.50 is fastened and fixed to the upper plate 15U via the collar 51.

[0019]

As described above, the present invention has the following advantages. That is, since the gate form is configured as in claim 1 or 2, the rigidity of the portal form itself is high due to its shape, and the housing is reinforced. The conversion device can be provided and supported in the space, and a support member for the conversion device can be eliminated, and the handle column can be firmly supported from the base on the upper surface of the portal form.

[0020] Further, with the construction as claimed in claim 3, the mounting bolts of the converter can be tightened from above, and the work of assembling the converter can be facilitated. The number of places to tighten the mounting flange of the handle column increases, so the tightening force is improved, and the area of the mounting surface of the mounting flange is increased, so that sufficient strength of the mounting part when excessive force is applied to the handle is secured. be able to.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor to which a handle column mounting configuration according to the present invention is applied.

FIG. 2 is a side sectional view of a mounting portion of the handle column.

FIG. 3 is a side cross-sectional view of a mounting portion at an upper portion of a handle column.

FIG. 4 is an exploded perspective view of a handle column, a gate frame, and a conversion device with respect to a housing.

FIG. 5 is a hydraulic circuit diagram of the power steering.

FIG. 6 is a side view showing another embodiment of the mounting portion of the handle column.

FIG. 7 is a side sectional view of a mounting portion of the handle column to which the vibration-proof structure is applied.

[Explanation of symbols]

 E Engine H Housing 5 Handle column 9 Drum-shaped housing part 10 Mid housing part 15 Gate form 15U Upper plate part 15L / 15R Leg plate part 16 Control unit 20 Handle shaft

Claims (3)

[Claims] 1. An upper plate, and a pair of leg plates suspended from both ends of the upper plate on an upper surface of a housing that houses a power transmission device interposed between the engine and the transmission and interlocking the two. And forming a portal frame having a handle column attached to the upper surface of the upper plate portion, in which a handle shaft is housed, and a lower surface of the upper plate portion,
A steering operation device for a vehicle, further comprising a converter connected to the handle shaft for converting a rotational motion of the handle shaft into a turning motion of a steering wheel. 2. An upper plate, and a pair of leg plates hanging from both ends of the upper plate, the upper plate being interposed between an engine and a transmission and containing a power transmission device for interlocking the two. And forming a portal frame having a handle column attached to the upper surface of the upper plate portion, in which a handle shaft is housed, and a lower surface of the upper plate portion,
A steering control device for a vehicle, further comprising a control valve type conversion device connected to the handle shaft for converting a rotational motion of the handle shaft into a telescopic motion of a power steering interlocked with a steering wheel. . 3. The steering of a vehicle according to claim 1, wherein a mounting flange portion provided at a base portion of the handle column is fastened to a case portion of the conversion device via the portal frame. Operating device.