JP3321508B2 - Vehicle frame structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a pair of left and right main frames extending in the front-rear direction, a control seat disposed above both main frames, and a fall protection member provided behind the control seat. The present invention relates to a frame structure of an upright vehicle.

[0002]

2. Description of the Related Art Conventionally, in a vehicle frame structure of this type, for example, Japanese Patent Application No.
As shown in No. 2725, a fall protection member is provided at the upper end of a rectangular frame member erected on a pair of left and right main frames, and a control seat and a fender are supported on another support member provided on the main frame. In this case, the pilot seat, the fall protection member, and the fender are connected to support and attach the pilot seat and the like to the body.

[0003]

However, in the above-mentioned conventional structure, the fall protection member, the pilot seat and the fender are individually supported and mounted on the main frame. Since a large number of supporting frame members and supporting members must be prepared, and only the main frame is used as a strength member, for example, in order to sufficiently withstand the impact load received from the fall protection member, The durability of the mainframe had to be extremely high, and the cost of the mainframe was increased due to the increase in the weight and the complexity of the reinforcement structure due to the enhancement of the durability. .

The present invention has been made in view of the above-mentioned circumstances, and uses a durable member other than the main frame as a strength member of a frame structure of an airframe to reduce the cost of the vehicle frame structure. The purpose is to provide.

[0005]

According to the present invention, in order to achieve the above object, a pair of left and right main frames are provided along a front-rear direction, and a control seat is disposed above both main frames. and a frame structure of a vehicle which is erected a fall protection member to the rear of the control seat, connects the front ends of both main frames in mission-case,
Power from the engine mounted on the rear of the aircraft via the transmission shaft
The transmitted hydrostatic continuously variable transmission is
It is integrally connected to the rear end and is located on the side of the hydrostatic continuously variable transmission.
A pair of left and right frame boards are provided along
The front end of the plate is connected to the case of the hydrostatic continuously variable transmission.
And the middle part in the front-back direction of both frame boards
After refraction molding at a position behind the hydrostatic continuously variable transmission
The ends are connected to a pair of left and right main frames,
Connect the fall protection member and the fender to the support frame,
This connecting frame is attached to the upper end of a pair of left and right frame members.
It is characterized by being connected and fixed . The operation and effect of this characteristic configuration are as follows.

[0006]

In other words, in addition to the pair of left and right main frames, the transmission case and the case of the hydrostatic continuously variable transmission connected to the main frame are used as strength members to form a pair of right and left frames having a simple structure. The driver's seat, the fall protection member, and the fender are connected to the main frame and the transmission case, etc., via the plate and the support frame. In addition, even if the durability of the main frame itself is set low, the durability of the entire frame structure of the body can be maintained high.

[0007]

As a result, the structure and weight of the main frame can be simplified and the number of frame members erected on the main frame can be reduced, so that the manufacturing cost can be reduced. .

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a riding lawn mower as an example of a vehicle. This riding lawn mower has a pair of left and right front wheels 1,1.
A boarding operation unit 4 is provided at the front of the body 3 movably supported by the rear wheels 2, 2, a driving unit 5 is provided at the rear of the body 3, and a front mower 6 is provided at a lower front part of the body. Make up.

As shown in FIGS. 1 to 3, the power from the engine E of the driving unit 5 is supplied to a hydrostatic continuously variable transmission (hereinafter abbreviated as HST) 7 disposed below the riding operation unit 4. The output from the HST 7 is input to a transmission case 9 disposed in front of the HST 7, and the transmission case 9 transmits a differential case for the rear wheels 2 and 2 and a differential case for the front wheels 1 and 1. The driving power is transmitted to 10. The transmission case 9 is connected to the differential case 10 by bolts, and the HST case 11 is connected to the rear of the transmission case 9 by bolts 18.

The body 3 is provided with a pair of left and right main frames 12, 12 which are long in front and rear. The main frames 12, 12 are bolted to the rear end of the transmission case 9, which is disposed at the center in the lateral direction of the vehicle body, with bolts 14, 14 via cylindrical spacers 13, 13. It is connected from the side. The main frame 1
Reference numerals 2 and 12 are formed of U-shaped frame members when viewed from the front.

Further, as shown in FIG. 2 to FIG.
The frame plate members 16, 16 fastened by bolts 15, 15 to the left and right lateral side surfaces of the case 11 of the T 7 from the lateral outside, and the rear end side thereof are the inner side surface portions 12 of the main frames 12, 12.
A, 12A are connected from outside by bolts 17, 17. The frame plate 16 includes connecting stays 19, 19 fastened by the bolts 18, 18 to the left and right ends of the rear surface of the thick flange portion 11a to be connected to the transmission case 9 of the case 11 of the HST 7. It is provided by welding in a holding shape. Further, the frame plates 16, 16
The bent portion 16 is a sheet metal material extending above the bolt connection portion to the HST 7 and the main frame 12 and bent near the bolt connection portion to the main frame 12.
a is provided to provide a reinforcing structure at the bending portion 16a. A support frame 20, which has a downward L-shape in a front view, is welded to the upper side 16b of the frame plate 16. The support frame 20 is set so that its longitudinal direction is along the front-rear direction, and the support frame 20
At the front of the vehicle, a fender 21 for the front wheel 1 and a driver seat 22 of the boarding driver 4 are fastened and connected by bolts 23. On the other hand, at the rear of the support frame 20, left and right base ends 24A, 2A of the arched fall protection member 24 are provided.
4 </ b> A and the fender 21 for the front wheel 1 are fastened and connected by bolts 25. As shown in FIG. 3, the fall protection member 24 is formed by bending a metal square pipe member into an arch shape, and connecting the base end of the square pipe member to the base end portions 24A, 24A having an L shape in a front view. Connected by welding. The pair of left and right base ends 24A, 24A are welded by reinforcing a plate 24B. Further, as shown in FIG. 4, the bending portions 16a, 16a of the two frame plate members 16, 16 are provided.
The reinforcing plate 42 is fastened and connected by bolts 26 and 27 in a state where the reinforcing plate 42 is installed on the left and right fenders 21 and 21, respectively.

As shown in FIG. 1, an operation pedal 29 for shifting the speed of the HST 7 is installed on a step portion 28 provided in the boarding operation portion 4 in a pivotally supported state so as to swing back and forth. As shown in FIGS. 5 and 6, the distal end of the push / pull rod 30 linked to the operation pedal 29 is integrally swung around a trunnion shaft 31 projecting laterally of the HST 7 and the axis P thereof. The arm 32 is linked. Then, a cam follower 34 that cams with a V-shaped cam surface 33a of a V-shaped cam plate 33 that swings integrally with the arm 32 and the trunnion shaft 31 is attached to the transmission case 9 by a horizontal axis Q.
Neutral position holding arm 35 swingably supported around it
So that the cam follower 34 is moved and biased toward the trunnion shaft 31 so as to be biased toward the neutral position holding arm 35.
Are elastically urged by a spring 36. With this configuration, when the operation pedal 29 is not depressed, the HST 7 is automatically held at the neutral position. Incidentally, as shown in FIG.
A state in which the swing support around the shaft center P is not performed by only the cantilever support of the case 11 of the HST 7 but the arm 32 and the V-shaped cam plate 33 are integrally welded and integrally rotated with the trunnion shaft 31. The distal end of the cylindrical boss 37 that is fitted to the outside is rotatably supported by a support rod 39. That is, the V
A cylindrical boss 37 integral with the U-shaped cam plate 33 is disposed between the frame plate 16 and the right main frame 12 through a hole 16 c formed in the right-hand frame plate 16. In a state in which a support rod body 39 that is rotatably and internally supported in a concave portion 38 at the tip of the boss 37 is passed through an opening 12 a opened in the main frame 12, a mounting plate 40 to which the support rod body 39 is welded is attached. Bolt 4 on frame 12
It is fastened and fixed at 1mm.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is an overall side view showing a riding lawn mower.

FIG. 2 is a longitudinal sectional side view showing a main part.

FIG. 3 is a longitudinal rear view showing a main part.

FIG. 4 is a perspective view showing a main part.

FIG. 5 is a cross-sectional plan view showing a shift operation unit of the hydrostatic continuously variable transmission.

FIG. 6 is a longitudinal sectional side view schematically showing a shift operation portion of the hydrostatic continuously variable transmission.

[Explanation of symbols]

 Reference Signs List 7 hydrostatic continuously variable transmission 9 transmission case 12 main frame 16 frame plate 20 support frame 21 fender 22 pilot seat 24 fall protection member

Continued on the front page (56) References JP-A 2-136747 (JP, U) JP-A 2-77156 (JP, U) JP-A 61-24227 (JP, U) JP-A 62-111281 (JP , U) Japanese Utility Model 2-68275 (JP, U) Japanese Utility Model 2-68274 (JP, U) Japanese Utility Model 63-171283 (JP, U) Japanese Utility Model 57-181676 (JP, U) Japanese Utility Model 1-1114385 (JP, U) Japanese Utility Model 60-124733 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 21/18 B62D 25/16

Claims (1)

(57) [Claims] 1. A vehicle comprising a pair of left and right main frames (12), (12) extending in the front-rear direction, a control seat (22) disposed above both main frames (12), (12), and , a frame structure of a vehicle which is erected a fall protection member (24) behind the control seat (22), the both main frames (12), Mi <br/> the front end (12) Connected to the car case (9) and mounted on the rear of the fuselage.
Power is transmitted from the engine (E) via the transmission shaft (8).
Static transmission type transmission (7) is mounted on the transmission case.
(9) It is integrally connected to the rear end , and the left and right sides are arranged along the side of the hydrostatic continuously variable transmission (7).
A pair of frame plate members (16) and (16) are provided.
The front ends of the frame plates (16), (16) are
Coupled to the case (11) of the step transmission (7)
In addition, in the front-back direction of both frame plate materials (16), (16)
Set the middle part behind the hydrostatic continuously variable transmission (7).
The rear end of the main frame is bent by refraction molding.
(12), (12), the cockpit (22), the overturn protection member (24), and
And the fender (21) to the support frame (20),
The connecting frame (20) is connected to the pair of left and right frame portions.
A frame structure of a vehicle fixedly connected to upper ends of members (16) and (16) .