JPH0641005Y2 - Power take-off device with oil pump - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a power take-out with an oil pump for efficiently circulating cooling / lubricating oil of a transmission equipped with a power take-out device having a PTO shaft, that is, a power take-out shaft. Regarding the device.

[Conventional technology]

For vehicles equipped with a power take-off device having a PTO shaft, that is, a power take-off shaft, such as construction machinery, agricultural tractors, fire trucks, crane cars, construction pump cars, etc., normally use the power take-out device after stopping the vehicle. To operate, the temperature of the cooling and lubricating oil in the transmission rises significantly.

Conventionally, in order to prevent a large increase in the temperature of oil, an oil pump for forcedly circulating lubricating oil is mounted on the transmission, and the oil pump is operated by a drive system independent of the drive system of the power takeoff device. Those disclosed in Japanese Utility Model Publication No. 49-53107 are disclosed. Second one disclosed in the above publication
Outline with reference to the figure.

FIG. 2 shows a PT which is an auxiliary machine drive shaft rotated by an engine.
A drive device is shown in which an oil pump 33 is attached to one end of the O-axis, that is, the power take-off shaft 31 via an Oldham's joint 32, and the oil pump 33 is operated by using the drive system of the power take-out shaft 31.

[Problems to be solved by the invention]

However, if the transmission is equipped with an oil pump and its drive source is taken from a location different from the drive system of the power takeoff device, a separate drive system for driving the oil pump is required. Therefore, the mechanism is complicated.

Further, as shown in FIG. 2, the one in which the oil pump 33 is coaxially attached to one end of the power take-off shaft 31 has an advantage that it cannot be mechanically simplified and is easily attached. , The operation of the power take-off shaft 31 and the operation of the oil pump 33 are always linked, and the oil pump 33 can be operated even in a situation where the forced circulation of oil is not required (for example, when the oil temperature is low). On the contrary, even if only the forced circulation of oil is required, the oil pump 33 cannot be operated unless it is integrated with the power takeoff device, and the load accompanying the pump operation cannot be reduced. I have a problem.

Therefore, an object of the present invention is to solve the above-mentioned problems, in order to solve the above-mentioned problems, it is configured such that the oil pump can be operated independently of the operation of the power take-off shaft while having a mechanically simple structure. The purpose of the present invention is to provide a power take-out device with an oil pump, which is capable of minimizing the pump operating load by operating the oil pump only when the oil temperature rises.

[Means for solving problems]

The present invention is configured as follows in order to achieve the above object. That is, the present invention relates to a power take-off shaft connected to a power take-off shaft drive gear via a power disconnecting means, an oil pump connected to the power take-out shaft drive gear via an oil pump driving means, and the oil pump to the power In order to operate independently of the take-out shaft, another power disconnecting means incorporated in the oil pump driving means, and another power disconnecting means so that the power can be interrupted even while the power take-out shaft driving gear is rotating The present invention relates to a power take-out device with an oil pump, which has a synchronizing device.

Further, the power take-off device with an oil pump operates the oil pump in response to a detection signal of an oil temperature higher than a preset temperature by an oil temperature detection sensor, and thus operates the other power disconnecting means to operate the oil pump. This is to make the synchronizer function.

[Action]

With the power take-out device with an oil pump according to the present invention configured as described above, the oil pump and the power take-out shaft can be operated independently.

Therefore, when the temperature of the normal oil is high, both of them are operated at the same time, and when the oil temperature is low even when the power take-off shaft is operating, that is, when the oil temperature is below a preset temperature (for example, about 140 The problem of oil deterioration does not occur at a temperature of ℃ or below). It is possible to turn off the power connecting / disconnecting means on the oil pump side so that the oil pump does not operate.

The power connecting / disconnecting means on the oil pump side incorporates a pin-type or synchronous ring-type synchronous meshing device, i.e., a synchronizing device, so that the power can be interrupted even while the power take-off shaft drive gear is rotating. By interlocking with the detection sensor, it is possible to respond to the detection signal of the oil temperature above the preset temperature by the oil temperature detection sensor, that is, to automatically operate the oil pump for cooling only when the oil temperature rises. Become.

Alternatively, even when the power take-out device is not operated during normal traveling, the oil pump can be operated independently by simply switching the clutch normally equipped on the take-out side of the power take-out device.

By adopting the above operation mode, the power take-out device with an oil pump can be operated in a state in which the operating load of the oil pump is minimized, even though the power take-out device with an oil pump has a simple structure. Becomes

〔Example〕

Embodiments of a power take-out device with an oil pump according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view of a power take-off device with an oil pump according to the present invention. A power take-out shaft drive gear 2 is rotatably attached to a power take-out shaft 1 of the power take-out device via a bearing 29. Between the power take-out shaft 1 and the power take-out shaft drive gear 2, a power interrupting means A including a conventionally known sleeve 3 and a shift fork 4 is provided. The power take-off shaft 1 is used, for example, as a power take-out device for driving an auxiliary machine provided in an agricultural tractor, a fire truck, a crane truck, a construction pump truck, and the like.

A drive shaft 5 of an oil pump (not shown) is installed parallel to the power takeoff shaft 1, and a power takeoff shaft drive gear 2 is provided on the drive shaft 5.
An oil pump drive gear 6 that constantly meshes with is rotatably mounted via a bearing 28. The drive shaft 5 has a pump gear 7 at a position opposite to the power take-out side of the power take-out shaft 1.
Is attached. The pump gear 7 fixed to the drive shaft 5 is connected to an oil pump (not shown) via a pump gear 8. It goes without saying that a gear pump or the like can be directly attached to the pump gear 7 instead of the pump gear 7.

Between the oil pump drive gear 6 and the drive shaft 5, there is provided a power connecting / disconnecting means B incorporating a synchronizing device including a sleeve 9, a shift fork 10, a synchronizing ring 23 and the like. The shift fork 10 is connected to a hydraulic actuator 12 via a rod 11. The illustrated actuator 12 includes a piston 13 integrally fixed to the rod 11 and a cylinder 14.

Pressurized fluid such as air flows in and out of the chambers 25 and 26 before and after the piston 13 through the pipes 15 and 24. Pipe lines 15 and 24 are solenoid valves 16a,
It is connected to a fluid pressure source 18 such as an air tank via ordinary fluid circuit means such as 16b and a pressure reducing valve 17. Solenoid valves 16a, 16b
Are configured so that they can be alternately opened and closed with respect to the fluid pressure source 18 according to the switching operation of the changeover switch 19. The changeover switch 19 is connected to the oil temperature detection sensor 20 via an appropriate control means, and the oil temperature detection sensor 20 exposes its sensing portion to the cooling / lubricating oil 22 at an appropriate location in the transmission 21. , Is installed so that the oil temperature can be detected.

Next, the operation of the power take-off device with an oil pump according to the present invention will be described.

When the oil temperature is lower than a certain temperature (for example, about 140 ° C.), the solenoid valve 16a is opened to the fluid pressure source 18 by the action of the oil temperature detection sensor 20 and the control means, and the solenoid valve 1
6b is closed to the fluid pressure source 18. The pressurized fluid flows into the chamber 25 on the piston rod side of the fluid actuator 12, and moves the piston 13 leftward in the drawing. When the piston 13 moves to the left, the shift fork 10 moves to the left, the inner teeth of the sleeve 9 disengage from the meshing teeth 27 of the oil pump drive gear 6, and the power connecting / disconnecting means B is disconnected.

Therefore, when the oil temperature is about 140 ° C. or lower, regardless of whether the power take-off device A on the power take-off device side is turned on or off, in other words, whether the power take-off shaft 1 is operated or not, the oil pump ( (Not shown) is in a non-operating state. As a result, the oil pump can be deactivated when the oil pump is not needed, and therefore the pump operating load can be reduced.

When the oil temperature exceeds a certain temperature, the changeover switch 19 is switched by the signal of the control means, and the solenoid valve 16a causes the fluid pressure source 1
Closed to 8, solenoid valve 16b opens to fluid pressure source 18. As a result, the air from the air tank 18 is reduced by the pressure reducing valve 17.
Through the solenoid valve 16b to the chamber 26 via the conduit 24. At this time, the air in the chamber 25 passes through the conduit 15 and the solenoid valve 16a.
Is configured to be discharged from.

When the air is sent into the chamber 26, the piston 13 moves to the right. When the piston 13 moves to the right, the shift fork 10 and the sleeve 9 move to the right, and the sleeve 9 moves via the synchronizing ring 23 to the oil pump drive gear 6
The meshing teeth 27 are meshed with each other, and the power connection / disconnection means B is brought into a continuous state.

Therefore, the oil pump starts to operate via the pump gears 7 and 8. As a result, the cooling / lubricating oil in the transmission is forcedly circulated. Even in this case, it is clear that the operation of the oil pump and the operation or non-operation of the power takeoff shaft 1 are independent of each other.

Although the embodiments of the power take-off device with an oil pump according to the present invention have been described above, it goes without saying that the present invention is not limited to the above embodiments. That is, in the above-mentioned embodiment, the oil temperature detecting sensor, the fluid actuator, the synchronizing device and the like are used, and the power disconnecting means on the oil pump side is configured to automatically repeat the connection / disconnection according to the level of the oil temperature. However, without being limited to such a configuration, for example, the means for shifting the power connection / disconnection means on the oil pump side may be any means. Alternatively, as the power connecting / disconnecting means, any connecting / disconnecting means such as an electromagnetic clutch can be used instead of the synchronizer.

[Effect of device]

Since the power take-off device with an oil pump according to the present invention is configured as described above, it is possible to operate the oil pump independently of the operation of the power take-out shaft even though it has a simple structure. At any time, the oil pump and / or the power takeoff device can be operated, and the efficiency of the operating load, particularly the operating load of the oil pump, can be minimized.

Further, by configuring the oil pump drive shaft and the power take-off device, that is, the PTO drive shaft coaxially, it is possible to greatly improve the cooling / lubrication performance when the PTO drive shaft is driven.
Furthermore, this power take-out device with an oil pump can drive only the oil pump even during normal traveling, so that the cooling / lubrication performance can be similarly improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a power take-out device with an oil pump according to the present invention, and FIG. 2 is a sectional view showing an example of a conventional accessory drive device. 1 ... power take-out shaft, 2 ... power take-out shaft drive gear, 3, 9 ...
… Sleeve, 4,10 …… Shift fork, 5 …… Drive shaft,
6 …… Oil pump drive gear, 7,8 …… Pump gear, 12
...... Fluid actuator, 16a, 16b ...... Solenoid valve, 18 ......
Fluid pressure source, 19 ... Changeover switch, 20 ... Oil temperature detection sensor, 21 ... Transmission case, 22 ... Cooling / lubricating oil, A ... Power take-off shaft side power disconnecting means, B ...
Oil pump side power intermittent means.

Claims (2)

[Scope of utility model registration request] 1. A power take-off shaft connected to a power take-off shaft drive gear via a power disconnecting means, an oil pump connected to the power take-off shaft drive gear via an oil pump driving means, and the oil pump to the power take-out. Another power interruption means incorporated in the oil pump driving means for operating independently of the shaft, and a synchronization incorporated in the other power interruption means so that power can be interrupted even while the power take-off shaft drive gear is rotating. A power take-out device with an oil pump. 2. In order to operate the oil pump in response to an oil temperature detection signal from an oil temperature detection sensor, which is equal to or higher than a preset temperature, the other power connecting / disconnecting means is operated to operate the synchronizing device. A power take-out device with an oil pump according to claim 1, which is characterized in that: