JPH0775425A - Riding type lawn mower - Google Patents

Abstract

PURPOSE:To reduce the noises of a bevel gear and the resonant sound of a cutting blade housing by specifying the attaching position and attaching state of a bevel gear case and driving blade shafts from the input shaft of a motor through a belt transmission device for blades. CONSTITUTION:A bevel gear case 5 is fixed to a bracket 9 vertically disposed on a cutting blade housing (m), and a driving force is transmitted from the output shaft of the bevel gear case to the input shaft 7a of a motor through a belt transmission device 6. Plural blade shafts are driven with the input shaft of a mower through a belt transmission device for the blades to lower the rotation number of the bevel gear.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riding lawn mower, and more specifically, it is transmitted from a PTO shaft of a traveling machine body to an input shaft of a bevel gear case on an upper surface of a cutting blade housing through a transmission shaft which is flexible and extendable. The present invention relates to a riding lawn mower that drives a blade.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Utility Model Laid-Open No. 5-43814, a bevel gear case is attached to the center of the upper surface of a cutting blade housing.

[0003]

Since a bevel gear that is driven to rotate at high speed is arranged at the center of the upper surface of the cutting blade housing of sheet metal, if the noise is large due to resonance with gear noise and slight vibration of the upper surface of the cutting blade housing. There was an inconvenience to say.

Therefore, as a means for solving the above-mentioned drawbacks,
It may be possible to support the bevel gear case via a vibration-proof rubber, but there is a problem that the output shaft of the bevel gear shakes due to the relative vibration of the bevel gear case with respect to the cutting blade housing.

It is an object of the present invention to reduce noise without causing inconvenience such as swinging of the output shaft of the bevel gear.

[0006]

The characteristic structure of the present invention for attaining the above object is that the bevel gear case is fixedly connected to a bracket that is erected over the corners of the upper surface of the cutting blade housing and the peripheral side wall. , The output shaft of the bevel gear case is transmitted to the input shaft of the mower via the belt transmission device, and further the plurality of blade shafts can be driven from the input shaft of the mower via the blade belt transmission device. is there.

[0007]

[Function] Since the output shaft of the bevel gear is configured to be transmitted to the input shaft of the mower through the belt transmission device,
By increasing the speed of the belt transmission, the rotation of the bevel gear can be reduced, and the gear noise of the bevel gear can be reduced.

By disposing the bevel gear case at the corner of the cutting blade housing where vibration is unlikely to occur, that is, at the corner between the upper surface of the cutting blade housing and the peripheral side wall, noise due to resonance can be suppressed.

Further, since the bevel gear case is attached without interposing the anti-vibration rubber, the output shaft of the bevel gear does not shake and the transmission belt of the belt transmission device does not wear unevenly.

[0010]

As a result of the above construction, gear noise of the bevel gear on the upper surface of the cutting blade housing and resonance noise with the cutting blade housing can be suppressed, and noise when driving the cutting blade can be reduced as a whole.

[0011]

Embodiments of the present invention will be described below with reference to a mid-mount type riding lawn mower.

FIG. 1 shows the entire riding lawn mower. This riding lawn mower is a front wheel steering type and a hydraulic cylinder between front and rear wheels 1 and 2 of a rear wheel drive type traveling body A. Via a link mechanism R driven up and down by the mower M
Is provided so that it can be raised and lowered.

The power transmission structure to the mower M is such that an input shaft 5 of a bevel gear case 5 having a bevel gear mounted therein is mounted on a PTO shaft 3 at the rear of the machine body through a transmission shaft 4 which can be bent and extended and expanded and contracted.
a to the blade shaft 7a of the mower M, which also serves as the input shaft of the mower M, from the output shaft 5b of the bevel gear case 5 to the input shaft thereof, as shown in FIG. The blade belt transmission device 8 is wound around the blade shaft 7a and the plurality of blade shafts 7b to drive the cutting blade.

The bevel gear case 5 is fixedly connected via a bolt to a pair of left and right brackets 9 standing upright over the corners of the upper surface ma of the cutting blade housing m made of sheet metal and the peripheral side wall mb.

The speed increasing belt transmission 6 is configured so that the pulley mounted on the output shaft 5b of the bevel gear case 5 has a larger diameter than the pulley mounted on the input blade shaft 7a and can be driven at a higher speed. .

[Other Embodiments] In the above embodiment, the blade shaft is also used as the input shaft of the mower, but a dedicated input shaft separate from the blade shaft may be used.

The riding lawn mower may be a front-mounting type lawn mower that is transmitted from the front PTO shaft at the front of the machine body to the input shaft of the bevel gear case on the upper surface of the cutting blade housing via a transmission shaft that can be flexed, extended and retracted. Good.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

1] Overall side view

FIG. 2 is a plan view of mower.

[Explanation of symbols]

 3 PTO shaft 5 bevel gear case 5a bevel gear input shaft 6 belt transmission device 7a mower input shaft 7b blade shaft 8 blade belt transmission device 9 bracket A traveling machine body m cutting blade housing ma cutting blade housing upper surface mb cutting blade housing peripheral wall

Claims (1)

[Claims] 1. An input shaft (5a) of a bevel gear case (5) on an upper surface of a cutting blade housing (m) via a transmission shaft (4) which is flexible and extendable from a PTO shaft (3) of a traveling machine body (A).
A bevel gear case (5) is erected over a corner between an upper surface (ma) of a cutting blade housing (m) and a peripheral side wall (mb). While being fixedly connected to the bracket (9), it is transmitted from the output shaft (5b) of the bevel gear case (5) to the input shaft (7a) of the mower (M) through the belt transmission device (6), and further the mower is transmitted. A riding lawn mower configured so that a plurality of blade shafts (7b) can be driven from an input shaft (7a) of (M) via a belt transmission device for blades (8).