JPH0490931A - Axle warming up device for work vehicle - Google Patents

Abstract

PURPOSE:To conduct warming up in a short time without traveling at the axle warming up device for a wheel loader or the like, by conducting warming up through operation of lubrication oil warming up heaters by means of an outside power source, and at the same time arranging so that the travel of a vehicle is prohibited during warming up. CONSTITUTION:Heaters 6 are operated by means of a power source outside a vehicle through a socket 34, and axle oil within axles 4 is warmed up. And at this time, electric power is also fed to a warming up display lamp 51, and when it is lighted, a line l1 is earthed due to the connection of a connector 32b, and parking lockout relay 23, 25 earths 23b, 25b are also electrified. Accordingly, switch portions 23a, 25a become OFF, and a solenoid valve 24 is kept at a neutral position even if a lever 21a is shifted to an advance side or a retreat side regardless of the operation condition of a parking lever 26a, and the travel prohibiting state is kept.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to an axle warm-up device used in a working vehicle, such as a wheel loader, which travels by transmitting power from a prime mover to the wheels via an axle.

B. Conventional technology Conventionally, HST (Hydro-5tatic T
A wheel loader employing a transmission system is known. This drives a hydraulic motor (not shown) with oil discharged from a variable displacement hydraulic pump (H5T pump) driven by the engine (prime mover), and the rotation of the hydraulic motor is transmitted to the wheels via the transmission, propeller shaft, and axle. It transmits information to drive.

Here, the axle is equipped with a differential gear unit, a planetary gear unit, etc. for power transmission, but in order to drive this type of gear unit smoothly, lubricant is usually kept inside the axle casing. (axle oil) is filled. However, in cold regions, for example, the viscosity of this axle oil is high, which increases the resistance when the gear unit operates, resulting in horsepower loss and the problem that the speed cannot be increased as intended. Conventionally, the axle oil has been warmed up by stirring the axle oil using the differential gear or the planetary gear device before starting the work.

C1 Problems to be Solved by the Invention However, in order to stir the axle oil using the above-mentioned gear device or the like, there is a problem in that it is necessary to run the vehicle, which is inconvenient and takes a long time.

An object of the present invention is to provide an axle warm-up device for a work vehicle that can warm up axle oil in a relatively short time without driving the vehicle.

00Means to solve problems This will be explained in conjunction with FIG. 1 showing one embodiment.

The present invention is applied to an axle warm-up device for a work vehicle that warms up the lubricating oil 10 in the axle 4 that transmits the power of the prime mover 1 (FIG. 2) to the vehicle Tlm5. The vehicle is equipped with a heater 6 that warms up the lubricating oil using a power source from outside the vehicle, and a prohibition means 100 that prohibits the vehicle from running when the heater 6 is operating, thereby solving the above-mentioned problems.

E0 action The heater 6 is operated by a power source from outside the vehicle to warm up the axle oil. This allows the vehicle to be warmed up in a short time without running the vehicle.

Further, when the heater 6 is operating, the inhibiting means 100
Since the vehicle is prohibited from running, the vehicle does not move undesirably during warm-up, and damage to cables and connectors connecting the heater 6 and the external power source can be prevented.

In the above-mentioned sections and section E, which describe the present invention in detail, figures of embodiments are used to make the present invention easier to understand, but the present invention is not limited to the embodiments.

F. Embodiment An embodiment in which the present invention is applied to an axle warm-up device for a wheel loader will be described with reference to FIGS. 1 to 5.

Figure 2 shows the side view of the wheel loader, and Figure 3 shows its a-a
It is a figure seen from a line.

The wheel loader of this embodiment employs the H8T system as described above, in which a variable capacity hydraulic pump (not shown) is activated by the power of the engine (prime mover) 1, and the oil discharged from this hydraulic pump drives the hydraulic motor ( (not shown) is moved, and the rotation of the hydraulic motor is transmitted to the propeller shaft 3 via the transmission 2. The rotation of the propeller shaft 3 rotates the axle S through the front and rear axles 4, thereby causing the vehicle to travel.

As shown in FIG. 4, the axle 4 includes a differential gear unit 4b and a pair of left and right drive shafts 4c in a casing 4a, and the rotation of the propeller shaft 3 is transmitted to the pair of drives via the differential gear unit 4b. The shaft 4c is rotated, and the rotation of the drive shaft 4c is transmitted to the axle 5 via a planetary gear device and the shaft (not shown). Further, the casing 4a is filled with lubricating oil (axle oil), as shown in FIG. 5, in order to smoothly move the differential gear unit 4b and the planetary gear system.

Reference numeral 6 denotes a heater for warming up the axle oil 10, and its heat generating portion 6a penetrates the casing 4a and is immersed in the axle oil 1o, and in this state, the threaded portion 6b is immersed in the axle oil 1o.
is screwed and fixed to the wall surface of the casing 4a.

FIG. 1 shows the electrical circuit of the wheel loader described above. Reference numeral 21 is a forward/reverse changeover switch, and when a lever 21a is operated, a movable contact 21b connected to the battery BT is activated.
The 6 contacts F can be switched to contacts F, N, and R.
It is connected to the solenoid section 22f of the solenoid valve 22 and the switch section 23a of the parking lockout relay 23.
It is connected to the solenoid section 24f of the electromagnetic valve 24 via the solenoid section 24f. Similarly, the terminal R is connected to the solenoid section 2 of the solenoid valve 22.
2r, and is also connected to the solenoid section 24r of the solenoid valve 24 via the switch section 25a of the parking lockout relay 25. Here, the solenoid valve 22.
By switching 24, the tilting direction of the H3T pump is determined, and the forward and backward movement of the vehicle is determined.

The battery BT is also connected to the parking switch 26 via contacts 23b and 25b of the parking lockout relay 23.25. The parking switch 26 is turned on by operating the lever 26a, and is turned off when the lever 26a is released. Parking lockout relay 23.2
The switch parts 23a and 25a of No. 5 have contacts 23b and 25b.
It is configured to turn off when conductive, and turn on when not conductive.

On the other hand, the contacts 23b and 25b of the parking lockout relay 23 and 25 are connected to the line Q1 and the connector 31.
Connector 32 exposed to the outside of the vehicle via a and 31b
connected to a. Also, the line Q2 connecting the connectors 31b and 32a has a line Q3. The front and rear heaters 6 described above are connected via Q4, and
A warm-up indicator lamp 51 is connected to line Q2 via connectors 31a and 31b. 32b is the cable 33
A connector connected to one end of the connector 32.
It is possible to connect to a. A socket 34 is attached to the other end of the cable 33, and this socket 34 is connected to a power source outside the vehicle. Then, connect the connector 32b to the connector 3
2a, line Q1 connects to connectors 31a, 31
b, 32a.

32b to ground. In addition, 41 is a back lamp,
42 is a back buzzer.

In the configuration of the above embodiment, the connector 31a.

31b, 32a, 32b and parking lockout relay 23.25 constitute inhibiting means 100.

Next, the operation of the wheel loader configured as described above during traveling will be described.

Assume that the parking lever 26a is not operated and the switch 26 is turned off. When this switch 26 is turned off, the contacts 23b and 25b of the parking lockout relay 23.25 are not electrically connected, and the switch portions 23a and 2
5a is on.

For example, if the lever 21a is operated in the forward direction in this state,
The movable contact 21b comes into contact with the contact F, which causes the solenoid valve 2
The second solenoid portion 22f is excited by the battery BT, and the solenoid valve 22 is switched to the forward position. Also, at this time, since the switch parts 23a and 25a are on, the solenoid part 24f of the solenoid valve 24 is energized by the forward operation, and the solenoid valve 24 is switched to the forward position. By switching both the solenoid valves 22 and 24 to the forward position, the above 1-
(The ST pump (not shown) discharges a predetermined amount of pressure oil in a predetermined tilting direction, which causes the hydraulic motor to rotate in a predetermined direction.The rotation of the hydraulic motor is controlled by the transmission 2. propeller shaft as described above. 3 and axle 4 to the axle 5, and the vehicle moves forward.

When the lever 21a is switched to the reverse side (contact R), both the electromagnetic valves 22 and 24 are switched to the reverse side, and the vehicle moves backward in the same manner as described above. At this time, the back lamp 41 and the back buzzer 42 are powered by the battery BT and operate.

On the other hand, when the parking lever 26a is operated and the switch 26 is turned on, the parking lockout relay 2
3.25 contacts 23b and 25b are electrically connected and the switch part 2
3a and 25a are turned off, so even if the forward/reverse switch 21 is switched to the forward or reverse side, the solenoid portion 24f or 24r of the solenoid valve 24 is not energized, and the solenoid valve 24 remains in the neutral position (solenoid valve 22 is switched). Therefore, the discharge amount of the HST pump is zero and the vehicle does not run. As described above, in this embodiment, since the vehicle is prohibited from running when the parking lever 26 is operated, it is possible to prevent the vehicle from moving undesirably while the vehicle is stopped.

Next, the warm-up operation of the axle oil 10 mentioned above will be explained.

For example, in a cold region, the axle oil 1o is warmed up the night before the wheel loader is used for work. When the connector 32b is first connected to the connector 32a and then the socket 34 is connected to an external power source (not shown), the cable 33. Connectors 32a, 32b and line Q2. ．． Q
3. Power is supplied to the front and rear heaters 6 through Q4, respectively.
Warming up of the axle oil 10 is started. At this time, the warm-up indicator lamp 51 is also supplied with power and lights up to indicate that the warm-up is in progress. Furthermore, since the line Q1 is grounded by connecting the connector 32b, the contacts 23b and 25b of the parking rolex out relays 23 and 25 are energized and the switch portions 23a and 25a are turned off. Therefore, regardless of the operating state of the parking lever 26a, the lever 21a
Even if the solenoid valve 24 is switched to the forward or reverse side, the solenoid valve 24 remains in the neutral position and the vehicle does not run.

According to the above embodiment, since the heater 6 operated by an external power source is used, the axle oil can be warmed up in a short time without running the vehicle. This warm-up lowers the viscosity of the axle oil and reduces the resistance when the gear unit operates, so the vehicle can be moved smoothly and work can be done even in cold regions, improving work efficiency. Furthermore, since the parking lockout relays 23 and 25 are also used to prohibit the vehicle from running during warm-up, undesired vehicle running may occur due to the cable 33 and connector 32a connecting the heater 6 and the external power source. , 32b, etc. will not be damaged.

In addition, in the above, parking lockout relay 23.2
5 is used to configure the prohibition means, however, the configuration of the prohibition means is not limited to this. Further, although the wheel loader employing the H3T system has been described, it is also possible to employ a wheel loader employing other traveling systems. Further, the present invention is not limited to wheel loaders, but can also be applied to, for example, wheeled hydraulic excavators and other work vehicles as long as the driving force of an engine is transmitted to wheels via an axle.

G1 Effects of the Invention According to the present invention, the axle oil is warmed up by a heater operated by an external power source of the vehicle, and the vehicle is prohibited from running while the heater is operating. It is convenient because it can be warmed up by using other methods, and it can be warmed up in an extremely short time compared to conventional methods using stirring. Furthermore, since the vehicle is prevented from running undesirably during warm-up, damage to the cables and connectors connecting the heater and the power source can be prevented.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, and FIG. 1 is a diagram showing a circuit configuration of a warm-up device according to the present invention. Figure 2 is a side view of the wheel loader, Figure 3 is its a-a
FIG. 4 is a plan sectional view showing details of the axle, and FIG. 5 is a view taken along line bb. 1: Engine 2: Transmission 3: Propeller shaft 4: Axle 5: Wheels
6: Heater 10: Axle oil 21: Forward/forward switch 22.
24: Solenoid valve 23. 25: Barking lockout relay 31a, 3
1b, 32a, 32b: Connector 33: Cable
34: Socket 100: Prohibited means

Claims (1)

[Claims] A warming device for warming up lubricating oil in an axle that transmits power from a prime mover to wheels, comprising: a heater for warming up the lubricating oil using a power source from outside the vehicle; 1. An axle warm-up device for a work vehicle, comprising: a prohibition means for prohibiting the vehicle from running when the vehicle is in use.