JP3580583B2 - Riding lawn mower - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a riding lawn mower, and more particularly, to integrally form a steering step, a seat mounting portion, and right and left rear wheel fenders to form a seat mounting frame, and pivot a front end side of the seat mounting frame to a body frame. The present invention relates to a riding lawn mower which is supported and connected and a rear end side of which is connected to a vehicle body frame via a pair of left and right suspension mechanisms.
[0002]
[Prior art]
As shown in Japanese Patent Application Laid-Open No. 6-245621, a conventional riding lawn mower is configured such that a front end side of a seat mounting frame integrally configured with a steering step, a seat mounting portion, and right and left rear wheel fenders is mounted on a vehicle body. The rear end is connected to the vehicle body frame via a pair of left and right suspension mechanisms in which a coil spring or the like is externally fitted to the rod.
[0003]
[Problems to be solved by the invention]
Due to the long stroke of the suspension mechanism, the working vehicle can absorb vibrations from the wheels due to unevenness of the ground better than when the suspension is absorbed by a seat suspension such as a spring provided below the seat. Also, as shown in Japanese Patent Application Laid-Open No. 2-208132, a mower with a mower's gauge wheel is lifted, that is, a lawn with the gauge wheel, compared with a case where the rear wheel is supported via a suspension mechanism. During mowing work with the gauge wheel floating for reasons such as not wanting to damage the body frame, the body frame does not move up and down due to the suspension action of the suspension mechanism, and the ground height of the mower mounted on the body frame changes. Although it has the advantage of avoiding uneven cutting height, the suspension mechanism has a long stroke, Due to the play of the joints, the seat mounting frame easily rolls with respect to the body frame, and the seat mounting frame shifts laterally with respect to the body frame during sudden turning of the aircraft or when working along contour lines on slopes. There is an inconvenience.
[0004]
Therefore, as means for solving the above drawbacks, it is conceivable to increase the supporting strength of the suspension mechanism to suppress the lateral displacement of the seat mounting frame, but in such a case, the supporting structure of the suspension mechanism is large. Become.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to suppress the roll and lateral displacement of a seat mounting frame without increasing the size of a suspension mechanism.
[0006]
[Means for Solving the Problems]
The technical means of the present invention according to claim 1, wherein a steering step, a seat mounting portion, and left and right rear wheel fenders are integrally formed to form a seat mounting frame, and the seat mounting portion is movable vertically. In a riding lawn mower in which the front end side of the mounting frame is attached to the body frame and the rear end side is connected to the body frame via a pair of left and right suspension mechanisms,
On the back side of the seat mounting frame, provided is a roll restricting means for restricting horizontal roll of the seat mounting frame,
The lateral movement is controlled by contacting the fixed part on the vehicle body frame side with the fixed part on the vehicle body frame side while allowing the relative movement in the vertical direction while maintaining the engagement state with the fixed part. That is, it is constituted by the engaging portion for regulating .
[0007]
The technical means of the present invention according to claim 2 is that the engaging portion on the back side of the seat mounting frame is formed of a U-shaped metal fitting which is open downward in rear view, and the fixed portion on the body frame side is attached to the lower part of the body frame. And a projection provided on the upper part of the mower lifting link mounting bracket .
[0008]
[Action]
According to the first aspect of the present invention, the vibration from the wheels caused by the unevenness of the ground can be absorbed through the suspension mechanism at the rear end of the seat mounting frame. When the centrifugal force acts, the engaging portion on the back side of the seat mounting frame comes into contact with the fixed portion on the vehicle body frame side from the side, so that the seat mounting frame is restrained from rolling or shifting.
[0009]
According to the second aspect of the present invention, it is possible to prevent the seat mounting frame from swaying or shifting using the mower lifting link mounting bracket.
[0010]
【The invention's effect】
According to the first aspect of the present invention, it is possible to suppress the lateral swing and the lateral displacement of the seat mounting frame without increasing the size of the suspension mechanism.
[0011]
According to the second aspect of the present invention, by using the link mounting bracket, a simple and inexpensive structure in which a U-shaped bracket is provided on the back side of the seat mounting frame can prevent the seat mounting frame from rolling or shifting. Can be suppressed.
[0012]
【Example】
FIG. 1 shows a mid-mount type riding lawn mower. In this riding lawn mower, an engine 4 is mounted on a front portion of a body frame 3 having a pair of left and right steering front wheels 1 and a pair of left and right driving rear wheels 2. A steering handle 5 and a driver's seat 6 are provided behind the vehicle, and a mower M is mounted on a lower portion of the body frame 3 between the front and rear wheels 1 and 2 via a link mechanism R so as to be movable up and down. is there.
[0013]
The link mechanism R includes a long link 7 extending in the longitudinal direction of the fuselage, a balance arm 8 connected to an intermediate portion of the long link 7, and a vertical link 9 connecting the balance arm 8 and the mower M. The rear end of the long link 7 is configured to be able to move up and down via a link mechanism 11 operated by a mower elevating lever 10, and a connecting hole between the balance arm 8 and the vertical link 9 is formed by a long hole 9a. A suspension work mode in which the upper end of the long hole 9a is supported by the balance arm 8 and the gauge wheel Ma of the mower M is lifted from the ground, and the balance arm 8 is positioned in the middle of the long hole 9a. It is possible to select a floating work mode in which the mower M is grounded with the gauge wheel Ma and mowing work is performed.
[0014]
As shown in FIG. 3, the steering step 12, the seat mounting portion 13, and the left and right rear wheel fenders 14 and 14 are formed from a single sheet metal to form a seat mounting frame A, and the front end side of the seat mounting frame A is formed. The rear end side is connected to the vehicle body frame 3 via a pair of left and right suspension mechanisms 15, 15 of a gas spring type while being engaged with and connected to the fixing pin a of the vehicle body frame 3 via the bracket b.
[0015]
The fixing pin a for the seat mounting frame A is set near the pedals so that the distance between the steering step 12 and the shift pedal 16 or the brake pedal 17 does not change due to the vertical movement of the seat mounting frame A.
[0016]
The seat mounting frame A is formed by drawing, has reinforcing ribs 12a, and has a back plate 18 welded and fixed to the back surface to increase rigidity. A bracket 20 having a U-shape in front view is provided. On the other hand, a link mechanism mounting bracket 19 as a fixed portion provided on the vehicle body frame 3 side, that is, a link mechanism mounting bracket 19 that pivotally supports the relay arm 11a of the link mechanism 11 around the fulcrum X, A convex portion 19a is provided for engaging and coupling with the U-shaped bracket 20 on the side of the seat mounting frame A. The lateral displacement of the seat mounting frame A with respect to the vehicle body frame 3 is regulated by the contact between the two. It is configured as follows. That is, the protruding portion 19a formed on the link mechanism mounting bracket 19 as the fixing portion and the U-shaped bracket 20 as the engaging portion constitute the roll restraining means .
[0017]
[Another Example] As shown in FIG. 5, in engaging and connecting the engaging portion on the seat mounting frame A side and the fixed portion on the vehicle body frame side, a downwardly protruding plate as an engaging portion on the back side of the seat mounting frame A. 20 may be provided, and the projection 19a of the link mechanism mounting bracket on the vehicle body frame side may be provided with a slit to engage and connect.
[Brief description of the drawings]
FIG. 1 is a side view of the entire riding lawn mower. FIG. 2 is a vertical side view of a seat mounting frame. FIG. 3 is a plan view of the same. FIG. 4 is a vertical rear view of a seat mounting frame. FIG. Rear view [Explanation of symbols]
3 Body frame 12 Steering step 13 Seat mounting part 14 Rear wheel fender 15 Suspension mechanism 19 Fixing part 20 Engaging part A Seat mounting frame

Claims (2)

The steering step (12), the seat mounting portion (13), and the left and right rear wheel fenders (14) and (14) are integrally formed to form a seat mounting frame (A), and the seat mounting portion (13) is provided. The front end side of the seat attachment frame (A) is attached to the body frame (3) so as to be vertically movable, and the rear end side is attached to the body frame (3) via a pair of left and right suspension mechanisms (15), (15). In the connected riding lawn mower,
On the back side of the seat mounting frame (A), there is provided a roll restricting means for restricting horizontal roll of the seat mounting frame (A),
The lateral movement restricting means is moved in the left-right direction while allowing the relative movement in the up-down direction while maintaining the engagement state with the fixing part (19) on the body frame (3) side and the fixing part (19). Is a riding lawn mower comprising an engaging portion (20) regulated by contact with the fixing portion (19) . 2. The riding lawn mower according to claim 1, wherein the engagement portion (20) on the back side of the seat mounting frame (3) is formed of a U-shaped metal fitting that is open downward from the rear view, and is fixed on the body frame (3) side. A riding lawn mower, comprising a convex portion (19a) provided on an upper portion of a mower lifting link mounting bracket (19) mounted on a lower portion of a vehicle body frame (3).

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