JP3203196B2 - Reel 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 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
Both If you allow the rotation restraint of Rirumoa ascent without using a large pump, in view of obtaining a proper cutting performance in accordance with the no-load by controlling the vehicle speed. A second and a third object of the present invention is to make it possible to adjust a lifting speed of a reel mower.

[0005]

[Action]

The mower rotation drive valve and the mower elevating valve are each configured by an electromagnetic valve, and both electromagnetic valves are connected in series to a single pump.Furthermore, pressure oil is simultaneously supplied to both electromagnetic valves. By linking the two solenoid valves via a control device so as to prevent the operation from being restrained, the entire amount of the hydraulic oil can be supplied to one of the actuators which is selectively driven. And, since the mutual check of both valves can be easily achieved on the electric circuit,
There is no need for an external (retrofit) sensor. A bypass path that short-circuits the supply oil path and return oil path to the mower rotation drive electromagnetic valve is provided, and a part of the hydraulic oil supplied to the reel mower is provided in the bypass path by providing a flow control valve in the bypass path. The flow rate of the mower can be adjusted by adjusting the flow rate of the flow control valve. [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. 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.

[0006] The present invention described in claim 2, serial to claim 1
In the above-mentioned invention, the supply to the
For the mower elevating hydraulic circuit consisting of the oil supply path and the return oil path
The short circuit between the supply oil passage and the return oil passage
A motor that introduces part of the oil supply to the mower elevating solenoid valve
A mower elevating bypass path is provided,
The flow path is provided with a flow control valve. The invention according to claim 1
In addition to the effects that could be achieved against
Various operational effects can be obtained . [Operation] By providing a bypass which short-circuits a supply oil passage and a return oil passage to the electromagnetic valve for mower elevating and lowering, 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 rate control valve that are inexpensive as compared with the variable pump, and an appropriate elevating speed can be obtained according to the work situation.

According to a third aspect of the present invention, a mower rotation driving electromagnetic valve and a mower lifting electromagnetic valve are connected in series to a single pump, and a mower rotation driving hydraulic motor and a mower lifting hydraulic pressure are connected. The two solenoid valves are linked via a control device to prevent the hydraulic oil from being supplied to the cylinder at the same time .
Hydraulic circuit for raising and lowering the mower consisting of a supply oil passage and a return oil passage
Short-circuit the supply oil path and the return oil path
Introducing part of oil supplied to the mower lifting solenoid valve Te
A mower elevating bypass path is provided for the mower elevating
A flow control valve is provided in the bypass. [Operation] By providing a bypass which short-circuits a supply oil passage and a return oil passage to the electromagnetic valve for mower elevating and lowering, 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 rate control valve that are inexpensive as compared with the variable pump, and an appropriate elevating speed can be obtained 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. Then, the reel mower rotation drive electromagnetic valve V1 is
The reel mower drive motors M1, M2,
When supplying the pressurized oil to M2, a part of the supply oil is returned to the oil passage b.
A bypass path c for short-circuiting is provided, and a variable throttle type flow control valve 13 provided with a check valve is provided in the bypass path c so that the rotation speed of the reel motor drive motors M1, M2, M2 can be changed. It is. Further, the mower elevating hydraulic pressure for the mower elevating electromagnetic valve V2.
The supply oil passage d on the upstream side of the flow path in the circuit is provided with a bypass passage f for short-circuiting a part of supply oil to the return oil passage e when supplying pressure oil to the mower lifting hydraulic cylinders C1, C2, C2. A variable throttle type flow control valve 14 provided with a check valve is provided in the bypass passage f so that the lifting speed of the reel mower lifting hydraulic cylinders C1, C2, C2 can be changed. In the figure, reference numeral 15 denotes a first relief valve for securing the rotation drive pressure of the reel, 16 denotes a second relief valve for securing the elevating pressure of the reel, and 17 denotes a third relief valve for reducing the reel mower ground load. The set pressure of the first relief valve 15 is set to 175 kg / cm2,
The set pressure of the relief valve 16 is set to 100 kg / cm2, and the set pressure of the third relief valve 17 is set to 30 kg / cm2. In the figure, V3, V4, and V4 are switching valves that can individually stop the hydraulic motors M1, M2, and M2.
If the switching valves V3, V4, V4 are switched to the stop position ST, the pressure oil does not pass through the switching valves V3, V4, V4 and is not supplied to the hydraulic motors M1, M2, M2, and 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, turn OFF the motor and stop the mower rotation switch 2
It is determined whether or not 0 is ON (step 3). If it is not ON, an ON operation is performed, and the AND condition that the set / reset switch 18 is OFF and the mower rotation stop switch 20 is ON is satisfied. Then, the engine can be started (step 4). 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, the set / reset switch 18 is turned on and the mower forward drive switch 21 is turned off.
If N is satisfied and the AND condition that the mower lifting switch 22 has been lowered is satisfied, the reel mower is rotationally driven (step 8). (Steps 5 to 7 constitute control means capable of rotating and driving the mower only when the mower is in the descending state.) Then, the mower is raised during the mowing operation in which the mower is rotationally driven (step 9). Then, the rotation of the mower is stopped (step 10), and the timer is operated (step 11). And
When the mower is lowered after the mower is stopped,
The mower is driven to rotate again. In such a case, the time for lowering the mower is equal to the set time of the timer (10
If it is within (seconds), the mower is lowered without sounding the alarm buzzer 24, and if it is longer than the set time of the timer,
The alarm buzzer 24 is sounded (step 13) to warn the user that the mower is driven to rotate when the mower is lowered. 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

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Matsuo Tachibana 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside Kubota Sakai Works Co., Ltd. (72) Inventor Hideya Umemoto 64 Ishizukitacho, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd In-house (56) References JP-A-56-75838 (JP, U) JP-A-62-136126 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01D 34/412-34 / 90

Claims (3)

(57) [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. The two electromagnetic valves are linked via a control device so as to prevent restraint from being performed ,
Supply oil passage and return for the mower rotation drive electromagnetic valve
For the mower rotation drive hydraulic circuit consisting of
The supply oil passage and the return oil passage are short-circuited to form the mower.
A mode for introducing a part of the supply oil to the rotary drive electromagnetic valve
(1) A bypass path for rotational drive is provided, and the flow rate is
Reel mower with control valve . 2. A supply oil for a mower elevating electromagnetic valve.
For the mower lifting hydraulic circuit consisting of
The supply oil passage and the return oil passage are short-circuited to
Mode to introduce a part of the oil supply to the solenoid valve
A) a lifting / lowering bypass path is provided;
2. The reel motor according to claim 1, wherein a flow control valve is provided in the path.
A. 3. A mower rotary drive electromagnetic valve and a mower elevating electromagnetic valve are connected in series to a single pump, and pressure oil is simultaneously supplied to a mower rotary drive hydraulic motor and a mower elevating hydraulic cylinder. The two electromagnetic valves are linked via a control device so as to prevent restraint from being performed ,
Supply oil path and return oil path for the mower elevating solenoid valve
The supply oil passage for the mower elevating hydraulic circuit comprising
And the return oil path are short-circuited, and the
Mower elevating bypass to introduce part of oil supply to lube
A flow control valve in the mower elevating bypass path.
Reel mower provided.