JP3113485B2 - Lawn mower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mid-mounted riding lawn mower and a front-mounted riding lawn mower, and more particularly, to transmission from a PTO shaft of a traveling body to an input shaft of a bevel case on an upper surface of a mower through a joint shaft. The present invention also relates to a lawn mower that drives a mower blade by winding a belt over an output pulley mounted on an output shaft of a bevel case and a pulley mounted on a plurality of blade shafts protruding from an upper surface of a mower cutting blade housing.

[0002]

2. Description of the Related Art A conventional lawn mower is disclosed in Japanese Utility Model Laid-Open No. 5-15722.
As shown in Japanese Unexamined Patent Publication (Kokai) No. 5-43814, the transmission is transmitted from the PTO shaft on the traveling body side to the input shaft of the bevel case via the joint shaft, and from the output pulley attached to the output shaft of the bevel case. A plurality of blade shafts are driven via a belt.

[0003]

Since the output pulley for the belt transmission is mounted on the longitudinal axis of the lower part of the bevel case, when the belt is replaced, the bevel case is moved to the support stay on the upper surface of the cutting blade housing. If the belt is not removed, the belt cannot be replaced, making it difficult to replace the belt. In addition, since the bevel case and the bearing holder are separately assembled to the cutting blade housing, noise is likely to be generated in the bevel gear mechanism in the bevel case due to instability due to an assembly error or the like. Further, since the bevel case projects upward from the rotation surface of the belt, the belt cover must be divided into left and right covers, which causes inconvenience in assembling the belt cover and increases manufacturing costs. . The connecting portion between the joint shaft and the input shaft of the bevel case, that is, the universal joint is exposed by the left and right split covers, so that the waste is easily wound around the connecting portion.

[0004] A first object of the present invention is to facilitate replacement of a belt.

A second object of the present invention is to suppress the noise of the bevel gear mechanism and to facilitate the manufacture of the bevel case and the bearing holder.

A third object of the present invention is to facilitate the manufacture of a belt cover.

[0007] A fourth object of the present invention is to suppress the wrapping of straw waste around the joint portion of the joint shaft.

[0008]

According to a first aspect of the present invention, there is provided a lawn mower including a PTO shaft extending toward a front side of the fuselage.
The power derived through the joint shaft is transmitted to the input shaft of the bevel case attached to the upper surface of the mower, and the blade is provided via a belt from the output pulley attached to the output shaft of the bevel case facing up and down. A lawn mower configured to be transmitted to a pulley mounted on a blade shaft, wherein the bevel case has an intermediate position in a vertical direction.
Provided with an introduction support for introducing the input shaft,
Blade holder on the lower part of the bearing holder
Projecting downward through the top of the jing
With the bevel cable positioned on the top side of the blade housing.
Fix the middle part of the blade to the cutting blade housing, and
Near the bottom edge near the top of the blade housing
Bevel cable between the position and the position below the upper surface.
And the upper end of the output shaft of the bevel case is projected upward from the upper surface of the bevel case, and the output pulley is mounted on the upper portion of the output shaft. Internally projecting downward from the lower surface of the bevel case, a blade is attached to the lower part of the output shaft , and the output shaft attached to the bevel case is horizontally
Located at the front of the fuselage with respect to the blade shafts
The center output shaft and the left and right blade shafts.
The imaginary line connecting the axis centers makes the apex forward and the bottom
Arrange so that a triangle located on the back side of the body is formed,
Input of the PTO axis, joint axis and bevel case
A shaft transmission mechanism comprising a shaft is connected to the rotating surface of the belt and the cutting surface.
Arranged to pass between the upper surface of the blade housing,
Triangle composed of the axis of the output shaft and the left and right blade shafts
That power has been input to the bevel case from the bottom side of the
Features.

[0009] lawnmower according to claim 2 of the present invention, claim
The method according to claim 1, wherein the joint axis and the input are provided.
A connection portion with the shaft within the rotation locus of the belt, and
Is set at a position in the vicinity of .

[0010]

The operation of the present invention according to the first aspect is as follows. Since the output pulley for the belt transmission is disposed above the bevel case, the belt can be replaced without removing the bevel case. Further, by disposing the output pulley above the bevel case, the height from the upper surface of the cutting blade housing to the upper surface of the bevel case can be reduced. Since the output shaft of the bevel case is also used as the blade shaft, the bevel case and the bearing holder for the bearing rotatably supporting the lower portion of the blade shaft can be integrally formed.

Further, by disposing an output pulley for the belt transmission device above the bevel case,
The belt transmission and the bevel case can be integrally covered with the belt cover, and the PTO of the traveling machine
By arranging the shaft transmission mechanism consisting of the shaft, the joint shaft, and the input shaft of the bevel case under the rotating surface of the belt, as in the case of arranging through the joint shaft of the shaft transmission mechanism in the belt rotation trajectory. In addition, there is no need to configure the belt cover into a left-right split type in order to avoid the joint shaft.

The operation of the present invention according to the second aspect is as follows. A shaft transmission mechanism including a PTO shaft and a joint shaft of a traveling body and an input shaft of a bevel case is disposed under a rotating surface of a belt, and a joint shaft in the shaft transmission mechanism and an input shaft of a bevel case. Is set in the rotation locus of the belt, and at a position near the locus, for example, the bending angle of the joint shaft is made smaller than when the connecting portion is set on the inner side of the locus. However, as compared with the case where it is set outside the trajectory, the belt cover can be used to cover the connecting portion where the straw dust easily winds without using a joint cover separately.

[0013]

According to the first invention, the following effects can be obtained by the above operation. That is, by disposing the input pulley above the bevel case, the belt can be easily replaced. Further, since the height from the upper surface of the cutting blade housing to the upper surface of the bevel case can be reduced, the mower is greatly increased in a mid-mounted riding lawn mower in which a mower is mounted between the front and rear wheels of the traveling body. There are advantages that can be. In the type in which the blade is attached to the output shaft of the bevel case, the bevel case is configured by integrally forming a bevel case portion in which a bevel gear mechanism is installed and a bearing holder portion for a lower bearing of the output shaft. And the case can be easily manufactured. In addition, since the bevel case and the bearing holder are integrally formed, gear noise due to turbulence can be suppressed as in the case where the bevel case and the bearing holder are separately formed and attached to the blade housing.

Further, by passing the shaft transmission mechanism under the rotating surface of the belt, a belt cover is provided so as to pass through the Johnt shaft of the shaft transmission mechanism in the rotation trajectory of the belt. Does not need to be formed in a left-right split type, and the belt cover can be easily manufactured.

According to the second aspect of the present invention , the following effects can be obtained by the above operation. Since the connecting portion of the shaft transmission mechanism on which the cutting waste and the like on the cutting blade housing are likely to wind is covered with the belt cover, winding of the straw and the like around the connecting portion can be suppressed without using a separate joint cover.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to a mid-mounted riding lawn mower. As shown in FIGS. 1 and 2, a mower M is mounted between the front and rear wheels 2, 3 of the traveling body 1 via a pair of front and rear links 4, 5 so as to be able to move up and down. PTO shaft 6 to joint shaft 7
Through the input shaft 8 of the bevel case C of the mower M.

The mower M is provided with a cutting blade housing M1.
Belt 11 is a mower of a three-blade type in which three blades b are installed, and a belt 11 extends between an output pulley 9a mounted on a central blade shaft 9 also serving as an output shaft of a bevel case C and a pulley 10a mounted on left and right blade shafts 10. From the central blade axis 9 to the left and right blade axes 10, 10
Is to be driven.

As shown in FIG. 3, the output shaft 9 also serving as the blade shaft is linked to the input shaft 8 of the bevel case C via a bevel gear mechanism B.
Is rotatably supported via a pair of upper and lower bearings b1 and b2 so as to penetrate the case C up and down, and the output pulley 9a is mounted on the vertical axis above the case C and the lower end thereof The blade b is attached to the blade. The bevel case C is a bevel case integrally formed with a gear case portion C1 containing a bevel gear mechanism B and a bearing holder portion C2 for a lower bearing b2 of the output shaft 9, and is bolted to the upper surface of the cutting blade housing M1. Have been.

As shown in FIG. 4, the left and right blade shafts 10
Is rotatably supported by the bearing holder 12 via a pair of upper and lower bearings b3 and b4, and the space between the pair of upper and lower bearings b3 and b4 is filled with grease G.

As shown in FIG. 3, the cutting blade housing M
A belt cover 13 that integrally covers the bevel case C and the belt 11 is detachably attached to the upper surface of the belt 1. As shown in FIG. 6, the attachment / detachment structure of the belt cover 13 includes a plurality of bolt insertion holes 13a at a front edge 13A of the belt cover 13 and a plurality of locking pin insertion holes 13b at a rear edge 13B of the belt cover 13. On the other hand, a plurality of brackets 14A to which nuts 14a are fixed are provided at the front of the upper surface of the cutting blade housing M1, and a plurality of locking pins 1 are provided at the rear.
The long bracket 14B to which the belt cover 4b is fixed is welded and fixed along the blade shafts 10, 9, 10 parallel direction, respectively, and the rear edge 13B of the belt cover 13 is fixed to the long bracket 1B.
4B is engaged with the locking pin 14b, and the leading edge 13A is
5, and is fixedly connected to the bracket 14A.

The bracket 14B for attaching the rear portion to the belt cover 13 is constituted by a long bracket extending along the direction in which the blade shafts 10, 9, 10 are arranged in parallel. The rigidity of the blade housing is increased. That is, the upper surface of the belt cover 13 can be prevented from warping. As shown in FIG. 6, a notch 13c for inserting the joint shaft is provided on the rear edge 13B of the belt cover 13, and a gap between the notch 13c and the joint shaft 7 is closed. A left and right split rubber hang 16 is attached.

Further, as shown in FIG. 4, a detachable rubber cap 17 is mounted on the upper surface of the belt cover 13 so as to close a hole 13d provided at a position corresponding to the left and right blade shafts 10. The left and right blade shafts 10
The grease can be supplied from above the belt cover 13 using a grease gun.

As shown in FIG. 3, the PTO of the traveling vehicle
A shaft transmission mechanism A including a shaft 6 and an input shaft 8 of a bevel gear mechanism B and a joint shaft 7 connecting both shafts 6 and 8 is disposed under the rotation surface S of the belt 11, and a bevel gear mechanism is provided. The connecting portion J between the input shaft 8 of B and the joint shaft 7, that is, the universal joint is set in the rotation locus P of the belt 11 and at a position near the locus P, and the connecting portion J in which straw chips and the like are easily wrapped. While the J is covered with the belt cover 13, the bending angle of the joint shaft 7 is made as small as possible so that efficient shaft transmission can be performed.

[Another Embodiment] The present invention can be applied to a front-mounted riding lawn mower having a mower mounted on a front portion of a traveling body.

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.

FIG. 2 is a plan view of a mower.

FIG. 3 is a longitudinal sectional view of the center of the mower.

FIG. 4 is a longitudinal sectional view of a mower end.

FIG. 5 is a rear view of the belt cover.

FIG. 6 is a perspective view of a cutting blade housing.

[Explanation of symbols]

 6 PTO shaft 7 Joint shaft 8 Input shaft 9 Output shaft 9a Output pulley 10 Pulley 11 Belt 13 Belt cover b Blade C Bevel case M Mower M1 Cutting blade housing

Claims (2)

(57) [Claims] 1. A PTO shaft extending toward the front of the fuselage.
Power derived from (6) via joint shaft (7)
To the input shaft (8) of the bevel case (C) attached to the upper surface of the mower (M), and the bevel case (C)
From an output pulley (9a) mounted on a vertical output shaft (9) of the above-mentioned through a belt (11) to a pulley (10a) mounted on a blade shaft (10) equipped with a blade (b). A lawn mower configured to be transmitted, wherein the bevel case (C) is located at an intermediate position in a vertical direction of the bevel case (C).
An introduction support for introducing the input shaft (8) is provided.
Of the bearing holder (C2) below the support
Protrude downward through the upper surface of the blade housing (M1)
And the support for introduction is on the upper surface side of the blade housing (M1).
With the bevel case (C) in the middle position,
(M1), the upper and lower of the output shaft (9)
Near the end, away from the top surface of the blade housing (M1)
Bevelke between the side position and the position below the upper surface
And the upper end of the output shaft (9) of the bevel case (C) is projected upward from the upper surface of the bevel case (C). The pulley (9a) is mounted, and the lower end of the output shaft (9) is attached to the blade housing (M).
The blade (b) is attached to the lower part of the output shaft (9) , protruding downward from the lower surface of the bevel case (C) inside 1), and the output shaft (9) attached to the bevel case (C). ) Left
Aircraft than each blade shaft (10) arranged on both right and left sides
Position the front output shaft (9) and the left and right
A virtual line segment connecting each axis with the blade axis (10) on the side
The triangle whose top is located at the front of the fuselage and whose bottom is located at the rear of the aircraft
The PTO shaft (6), the joint shaft (7) and the bevel are arranged so as to form a shape.
Shaft transmission mechanism (A) consisting of input shaft (8) of case (C)
And the rotating surface (S) of the belt (11) and the cutting blade
It is arranged so that it passes between the upper surface of the jing (M1) and
With the axis of the output shaft (9) and the left and right blade shafts (10)
Moving from the bottom side of the triangle configured Beberuke over scan (C)
Lawn mower inputting power. 2. The input shaft (7) and the joint shaft (7).
The connecting portion (J) with (8) is connected to the rotating gauge of the belt (11).
Set at a position within the trace (P) and near the locus (P)
The lawn mower according to claim 1.