JPH10164954A - Reel mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain rotation when a reel mower is elevated without using an externally attached (posteriorly attached) mower elevation state detection sensor or without using a large-sized pump. SOLUTION: A solenoid valve V1 for rotationally driving a mower and the solenoid valve V2 for elevating and lowering the mower are serially connected to a single pump P and both solenoid valves V1 and V2 are connected through a controller S so as to restrain and obstruct the simultaneous supply of pressure oil to hydraulic motors M1 and M2 for rotationally driving the mower and hydraulic cylinders C1 and C2 for elevating and lowering the mower.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel mower which is driven to rotate via a hydraulic motor.

[0002]

2. Description of the Related Art In a conventional reel mower, as shown in FIG. 7, pressure oil from a pump P is supplied to a reel mower lifting / lowering cylinder C1, C2 via a flow dividing valve F and hydraulic motors M2, M1, M2 for driving the reel mower rotation. And lift cylinders C1, C2 through manually operated valves VA, VB provided in each supply path.
C2 and the hydraulic motors M2, M1 and M2 can be operated independently, and a lift cylinder C2 of the reel mower is used as a means for avoiding the danger of the reel mower being rotationally driven when the reel mower is in the up state. A mower lifting state detection sensor S comprising a limit switch for detecting that the lifting operation has been performed is provided. On the other hand, a hydraulic oil supply to the reel mower driving hydraulic motors M2, M1, M2 is provided below the flow path of the reel mower rotation operation valve VB. Is provided, and based on the rise detection result of the sensor S, the solenoid on-off valve VC is operated via a control device, so that the hydraulic oil to the motor is released when the mower is in the up state. The motor is configured to be short-circuited to prevent the mower from being rotationally driven.

[0003]

Since the mower elevating operation and the mower rotating operation can be operated independently, respectively, when the reel mower is lifted, an external (retrofit) is required to make the reel mower unrotatable. It is necessary to activate the mower rising state detection sensor. Also, since the pressure oil from the pump is diverted to the mower elevating circuit and the mower rotation drive circuit via the diverting valve, the operating oil also flows to the other actuator that is not used, and the large capacity large pump has There is the disadvantage of requiring a pump. Furthermore, since pressure oil is supplied using a constant displacement pump, which is cheaper than a variable pump, the rotation of the reel mower is constant, and in order to obtain appropriate cutting performance according to the load, the vehicle speed must be controlled. In addition, there is an inconvenience that the elevating speed of the reel mower cannot be adjusted.

A first object of the present invention is to provide an external (retrofitting) device.
Without using the mower rising state detection sensor of
Another object of the present invention is to make it possible to perform rotation check when the reel mower is raised without using a large pump. A second object of the present invention is to obtain an appropriate cutting performance according to a load without controlling the vehicle speed. A third object of the present invention is to make it possible to adjust the lifting speed of the reel mower.

[0005]

According to the first aspect of the present invention, an electromagnetic valve for driving a mower rotation and an electromagnetic valve for elevating and lowering a mower are connected in series to a single pump.
The two electromagnetic valves are linked via a control device so as to prevent the hydraulic oil for mower rotation drive and the hydraulic cylinder for mower lifting and lowering from being simultaneously supplied with hydraulic oil. [Operation] The mower rotation drive valve and the mower elevating valve are each constituted by an electromagnetic valve, and both electromagnetic valves are connected in series to a single pump. By controlling the two electromagnetic valves via a control device so as to prevent the supply of hydraulic fluid from being supplied, the entire amount of the hydraulic oil can be supplied to one of the actuators that is selectively driven. In addition, since mutual control of both valves can be easily performed on the electric circuit, there is no need for an external (retrofit) sensor. [Effect] According to the first aspect of the present invention, it is possible to reduce the size of the pump, and to prevent the rotation drive when the mower is raised without using an external (retrofit) sensor. As in the case of using an external sensor, it is possible to avoid a situation where the sensor comes into contact with and damages another object.

According to a second aspect of the present invention, a bypass path is provided for short-circuiting a supply oil path and a return oil path to the electromagnetic valve for mower rotation drive, and a flow control valve is provided in the bypass path. [Operation] Bypassing a part of the hydraulic oil supplied to the reel mower by providing a bypass path for short-circuiting the supply oil path and the return oil path to the electromagnetic valve for the mower rotation drive and providing a flow control valve in the bypass path. The air can be released through a flow control valve provided in the path, and the rotational speed of the mower can be adjusted by adjusting the flow rate of the flow control valve. [Effect] As a result of the above configuration, appropriate rotation can be obtained according to load conditions such as plant height and grass amount without controlling the vehicle speed.

According to a third aspect of the present invention, there is provided a bypass for short-circuiting a supply oil passage and a return oil passage to the electromagnetic valve for raising and lowering the mower, and a flow control valve is provided in the bypass. [Operation] By providing a bypass which short-circuits a supply oil path and a return oil path to the mower elevating electromagnetic valve, and by providing a flow control valve in the bypass, a part of the hydraulic oil supplied to the reel mower can be bypassed. Can be released through a flow control valve provided in the air conditioner, and by adjusting the flow rate of the flow control valve, the elevating speed of the mower can be adjusted. [Effect] As a result of the above configuration, it is possible to adjust the elevating speed of the mower by using a constant displacement pump and a flow control valve which are inexpensive as compared with the variable pump, and it is possible to obtain an appropriate elevating speed according to the work situation.

[0008]

FIG. 1 shows an entire front-mounted riding lawn mower equipped with a reel mower at the front of the fuselage. This riding lawn mower is a four-wheel drive type rear wheel steering type, and has a front wheel 1. A steering handle 4 at a front portion of a body frame 3 having a rear wheel 2, a driving seat 5 at an intermediate portion,
An engine 6 is provided at the rear, and a center reel mower 7 and a pair of left and right side reel mowers 8, 8 are provided at the front of the traveling machine so as to be able to move up and down.

As shown in FIGS. 2 and 3, a center reel mower 7 disposed at the left and right center of the fuselage, and a pair of left and right side reel mowers 8 disposed at both left and right sides of the fuselage.
The rotary cutters 7A, 8A, 8A are rotationally driven via hydraulic motors M1, M2, M2 attached to the side surfaces of the cutter case, and the center reel mower 7 and a pair of left and right side reel mowers 8, 8 is driven up and down through lift arms 9, 10, and 10 driven up and down by hydraulic cylinders C1, C2, and C2.

Next, a hydraulic circuit for the reel mower will be described. As shown in FIG. 4, an electromagnetic valve V1 for driving the reel mower to rotate and a reel mower for raising and lowering the reel mower are provided for a constant displacement pump P driven by the engine E. An electromagnetic valve V2 is connected in series, and a hydraulic motor M for driving the center mower and a pair of left and right side mowers is provided below the flow path of the electromagnetic valve V1 for rotating the reel mower.
1, M2 and M2 are connected in series. The center mower and the left and right side mower elevating hydraulic cylinders C1, C2, C2 are connected in parallel to the lower side of the flow path of the reel mower elevating electromagnetic valve V2, and the elevating hydraulic cylinder C1 is connected to the reel mower elevating electromagnetic valve V2. , C
2, two check valves 11 and 12 for preventing the reel mower from lowering are provided in the oil passage to C2. The one check valve 12 is a pilot-type check valve, and when the reel mower is lowered, the valve 12 is opened by the pilot pressure so that the weight of the reel mower can be lowered. When supplying pressure oil to the reel motor driving motors M1, M2, and M2, a part of the supply oil is returned to the supply oil path b on the upper side of the flow path of the electromagnetic valve V1 for reel mower rotation drive. A bypass path c for short-circuiting is provided, and a variable throttle type flow control valve 13 having a check valve is provided in the bypass path c.
The rotation speeds for M1, M2 and M2 can be changed. The mower elevating hydraulic cylinder C is provided in the supply oil passage d on the upstream side of the flow path of the mower elevating electromagnetic valve V2.
At the time of supply of pressure oil to 1, C2 and C2, a bypass path f for short-circuiting a part of supply oil to a return oil path e is provided, and a variable throttle type flow control valve 14 having a check valve is provided in the bypass path f. And the hydraulic cylinder C for lifting and lowering the reel mower.
The lifting speed with respect to C1, C2 and C2 can be changed. In the figure, reference numeral 15 denotes a first relief valve for securing the rotation driving pressure of the reel, 16 denotes a second relief valve for securing the elevating pressure of the reel, and 17 denotes a third relief for reducing the reel mower grounding load.
A set pressure of the first relief valve 15 at 175 kg / cm ² , a set pressure of the second relief valve 16 at 100 kg / cm ² ,
Is set to 30 kg / cm ² . In the figure, V
Reference numerals 3, V4 and V4 denote switching valves which can individually stop the hydraulic motors M1, M2 and M2.
When V4 and V4 are switched to the stop position ST, the pressure oil passes through the switching valves V3, V4 and V4 and the hydraulic motor M
1, M2, M2, the hydraulic motors M1, M2,
M2 is stopped.

As shown in FIG. 5, the solenoid valve V1 for rotating and driving the reel mower and the solenoid valve V2 for raising and lowering the reel mower are operated via a control device S comprising a microcomputer. Signals of an engine key switch 18, a set / reset switch 19 including a toggle switch, a mower rotation stop switch 20, a mower forward drive switch 21, a mower up / down switch 22, and a mower reverse drive switch 23 are input to S. The reel motor rotation electromagnetic valve V1, the reel mower lifting electromagnetic valve V2, and the alarm buzzer 24 can be operated by signals from the switches 18 to 23. The control device S is provided with control means A capable of rotating and driving the mower only when the mower is in the lowered state.

Next, the control means A for driving the reel mower will be described with reference to the flowchart of FIG. 6. In order to drive the reel mower, a double action operation must be performed. That is,
When the engine is started, the mower rotation stop switch 20 must be operated as a first action operation, and when the reel mower is driven, the reel mower up / down switch 22 must be operated as a second action operation. It is configured so that double action operation is possible. More specifically, when the reel mower is driven, after the key switch 18 of the engine is turned on (step 1), it is determined whether or not the set / reset switch 19 of the control device is off (reset) (step 1). 2) If it is not OFF, it is turned OFF, and it is determined whether or not the mower rotation stop switch 20 is ON (step 3).
If not, turn on the switch, set / reset switch 18 is off, and mower rotation stop switch 20
The engine can be started (step 4) when the AND condition of ON is satisfied. Next, the set / reset switch 18 is turned on (set) (step 5), the mower forward drive switch 21 is turned on (step 6), and the mower up / down switch 22 is turned down (step 7). Then, when the set / reset switch 18 is ON, the mower forward drive switch 21 is ON, and the AND condition that the mower up / down switch 22 is operated to descend is satisfied, the reel mower is driven to rotate (step 8). ) Is done. (Steps 5 to 7 constitute control means capable of rotating and driving the mower only when the mower is in the descending state.) Then, during the mowing operation in which the mower is rotationally driven, the mower is raised (step 9).
Then, the rotation of the mower is stopped (step 10), and the timer is operated (step 11). When the mower is lowered after the mower is stopped, the mower is driven to rotate again. In such a case, if the time for lowering the mower is within the set time (10 seconds) of the timer, the mower is lowered without sounding the alarm buzzer 24 without any alarm. Is sounded (step 13), and when the mower is lowered, it is warned that the motor will be driven to rotate. The alarm buzzer 24 is stopped when the mower is lowered.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the same.

FIG. 3 is a side view of a reel mower.

FIG. 4 is a hydraulic circuit diagram

FIG. 5 is a block diagram.

FIG. 6 is a flowchart.

FIG. 7 is a conventional hydraulic circuit diagram.

[Explanation of symbols]

 13, 14 Flow control valves C1, C2 Mower lifting hydraulic cylinder M1, M2 Mower rotation driving hydraulic motor P pump S controller V1 Mower rotation driving electromagnetic valve V2 Mower lifting electromagnetic valve a, d Supply oil passage b, e Return oil passage c, f Bypass passage

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Matsuo Tachibana 64 Ishizukitamachi, Sakai City, Osaka Prefecture Inside Kubota Sakai Factory (72) Inventor Hideya Umemoto 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. Inside

Claims (3)

[Claims] 1. A mower rotation driving electromagnetic valve and a mower lifting electromagnetic valve are connected in series to a single pump, and pressure oil is simultaneously supplied to a mower rotation driving hydraulic motor and a mower lifting hydraulic cylinder. A reel mower that links both solenoid valves via a control device so as to prevent restraint from being performed. 2. A bypass path for short-circuiting a supply oil path and a return oil path to the mower rotation drive electromagnetic valve, and a flow control valve is provided in the bypass path.
Reel mower described in. 3. The reel mower according to claim 1, wherein a bypass path for short-circuiting a supply oil path and a return oil path to the mower elevating electromagnetic valve is provided, and a flow control valve is provided in the bypass path. .