JPH0767433A - Blade shaft attaching structure of mower - Google Patents

Abstract

PURPOSE:To obtain structure suppressing vibration of a mower deck by inserting an elastic body into space between a bearing of a blade shaft and a mower deck and connecting plural blade shafts by a rigid connecting member in a state where the distance between shafts is kept constant and a state where a bearing 18 is inserted. CONSTITUTION:In a blade shaft attaching structure of a mower attaching plural blade shafts 8 having a blade 3 for lawn mowing and a pulley to a mower deck 1 and hanging a transmission belt 5 around plural pulleys 4, an elastic bodies 12 for insulating vibration are inserted into space between a bearing 9 of the blade shaft 8 and the mower deck 1 and plural blade shafts 8 are connected by a rigid connecting member 17 in a state where the distance between these shafts is kept constant and a state where a bearing 18 is inserted into space between the blade shaft 8 and the rigid connecting member 17. Thereby, vibration of the mower deck due to a mower driving system is suppressed and occurrence of noise from the mower deck caused by vibration of the motor driving system is sufficiently suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mower blade shaft mounting structure in which a plurality of blade shafts having lawn mowing blades and pulleys are mounted on a mower deck, and a transmission belt is wound around the plurality of pulleys.

[0002]

2. Description of the Related Art Conventionally, a bearing for a blade shaft has been fixed to a mower deck.

[0003]

However, the mower deck resonates with the vibration of the mower drive system, and the noise due to the mower deck tends to be large, and there is room for improvement in terms of quietness. An object of the present invention is to effectively suppress the vibration of the mower deck caused by the mower drive system, sufficiently reduce noise, and prevent defective driving of the blade due to the noise.

[0004]

SUMMARY OF THE INVENTION A characteristic feature of the present invention is that in a mower in which a plurality of blade shafts having lawn mowing blades and pulleys are mounted on a mower deck, and a transmission belt is wound over the plurality of pulleys, the bearings of the blade shafts are provided. An anti-vibration elastic body is interposed between the blade shaft and the mower deck, and a plurality of blade shafts are rigidly connected with each other while maintaining a constant distance between them, and between the blade shafts and the rigid connection member. This is because the bearings are connected to each other with the bearings interposed.

[0005]

In other words, by installing the vibration-proof elastic body between the bearing of the blade shaft and the mower deck, the resonance of the mower deck with respect to the vibration of the mower drive system is sufficiently suppressed and the noise from the mower deck is effectively suppressed. Can be made smaller. Furthermore, if a vibration-proof elastic body is simply interposed between the bearing and the mower deck, the elastic shaft is deformed to change the axial distance between the blade shafts, causing the transmission belt wound over a plurality of pulleys to slip and However, according to the present invention, a plurality of blade shafts are connected to each other by a rigid connecting member so as to maintain a constant axial distance between the blade shafts, and Since the bearing is interposed between the connecting members to make the rotation of the blade shaft smooth, it is possible to reliably prevent defective driving of the blade due to slip of the transmission belt.

[0006]

As a result, it is possible to provide a mower having excellent quietness, which can sufficiently suppress the noise generation from the mower deck due to the vibration of the mower drive system, while favorably realizing the blade drive by the transmission belt. It was

[0007]

EXAMPLE As shown in FIG. 1, three lawn mowing blades 3 are arranged in parallel along a mowing lawn discharge path 2 inside a mower deck 1 having an opening at the bottom, and these blades 3 are attached to the lower end side. The pulley 4 is attached to the upper end of each of the three blade shafts 8, the transmission belt 5 is wound around these three pulleys 4, and the tension pulley 6 acts on the transmission belt 5.
The input shaft 7 that is interlocked with the central blade 3 is configured to transmit power from a PTO shaft such as a tractor,
A mower is formed to mow the turf as the blade 3 is driven and rotated, and discharges the turf to the outside of the mower deck 1 from the outlet 2a at one end of the turf discharge path 2.

As shown in FIG. 2, an anti-vibration rubber 12 is provided between a bearing 9 of a blade shaft 8 having a central blade 3 attached thereto and a mower deck 1 to cause resonance of the mower deck 1 with respect to vibration of the mower drive system. It is configured to reduce the generated noise. A bevel gear 13 that interlocks the input shaft 7 and the blade shaft 8 is housed in a case 14, and the case 14 is attached to the mower deck 1 with a bracket 15 and a vibration-proof rubber 16.
When the bevel gear 13 is attached to the blade shaft 8, the gap between the bevel gear 13 and the retaining clip 19 allows the blade shaft 8 and the bevel gear 13 to move up and down relative to each other. Blade shaft 8
The case 14 can be moved up and down relatively.

As shown in FIG. 3, an anti-vibration rubber 12 is interposed between the bearing 9 of the blade shaft 8 to which the left and right blades 3 are attached and the mower deck 1 to cause resonance of the mower deck 1 with respect to vibration of the mower drive system. It is configured to reduce the generated noise.

As shown in FIGS. 2 to 4, a plurality of blade shafts 8 are connected by a rigid connecting member 17 and a bearing 18 is interposed between the blade shaft 8 and the rigid connecting member 17, The distance between the three blade shafts 8 is kept constant, and the drive failure of the blades 3 due to the slip of the transmission belt 5 is prevented regardless of the deformation of the vibration isolating rubber 12.

As shown in FIGS. 5 and 6, a pair of left and right idler rollers 20 are provided at the rear portion of the mower deck 1 so that obstacles on the ground can be easily overcome, and the roller support stay 21 is replaced. Idling roller 20
Is configured to switch between the use position and the storage position,
When the mower is detached from the tractor and stored, the mower deck 1 is stably supported by the idle roller 20 and can be placed in a narrow place.

[Other Embodiments] The type and form of the vibration isolating means interposed between the bearing 9 of the blade shaft 8 and the mower deck 1 can be appropriately changed, and these means are collectively referred to as the vibration isolating elastic body 12. The specific structure for connecting the plurality of blade shafts 8 so that the distance between the shafts is constant can be changed as appropriate, and these connecting means are collectively referred to as a rigid connecting member 17.

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]

FIG. 1 is an overall plan view of mower.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a view taken along the line BB of FIG.

FIG. 4 is a plan view of a rigid connecting member.

FIG. 5: Side view of mower

FIG. 6 is a side view showing a storage state of the mower.

[Explanation of symbols]

 1 mower deck 3 blade 4 pulley 8 blade shaft 9 bearing 12 vibration-proof elastic body 17 rigid connecting member 18 bearing

Claims (1)

[Claims] 1. A lawn mowing blade (3) and a pulley (4)
A plurality of blade axes (8) having a mower deck (1)
In a mower in which a transmission belt (5) is wound around a plurality of pulleys (4), a vibration-proof elastic body (a) is provided between the bearing (9) of the blade shaft (8) and the mower deck (1). 12), and a plurality of blade shafts (8) are rigidly connected to each other by a rigid connecting member (17) while maintaining a constant distance between the blade shafts (8) and the blade shafts (8). A mower blade shaft mounting structure in which a bearing (18) is connected between members (17).