JPH01277691A - Hydraulic device - Google Patents

Abstract

PURPOSE:To prolong the service life of a shaft end and a joint so sharply by installing a liquid passage being interconnected to the suction side of a hydraulic pump and a connecting chamber sealed from the atmosphere. CONSTITUTION:An output shaft 5 of a motor 2 is supported by a bearing 7 in a cylindrical part 6, and in an opening of this cylindrical part 6, there is provided with a seal 8 which prevents a fluid from penetrating into the motor 2 from the outside. In a contact surface between the cylindrical part 6 and a front cover 10, there is provided with an O-ring 24 which intercepts a connecting chamber 23 from the outside atmosphere. Since this connecting chamber 23 is interconnected to a suction port of a pump 3 by a liquid passage 32, the inside of this connecting chamber 23 comes to negative pressure during operation. If the operations is stopped, the liquid flows into the connecting chamber 23 in a vacuum state by way of the liquid passage 32.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydraulic device that combines a prime mover and a hydraulic pump.

[Prior Art] In a hydraulic system that combines a prime mover and a hydraulic pump, when an Oldham joint or a sleeve joint is used for the shaft joint that connects the output shaft of the prime mover and the input shaft of the pump, it is difficult to lubricate the joint. The method used is to fill or apply grease.

[Problems to be solved by the invention] In the conventional lubrication method described above, since the grease has a high viscosity,
There is a problem in that when the - is scattered due to the rotation of the joint, it does not return to the contact surface and lubrication is likely to run out. This tendency is particularly noticeable when rotating at high speeds.
Damage accidents due to lack of lubrication were likely to occur.

To prevent this, it is necessary to replace and refill the grease at appropriate intervals, but this requires disassembling the hydraulic device, which is very time-consuming.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a hydraulic device having the following structure.

That is, the hydraulic device according to the present invention is a hydraulic device in which the output shaft of a prime mover and the input shaft of a hydraulic pump are connected, and a seal is provided on the output shaft side of the prime mover to prevent liquid from entering the prime mover. The connection between the output shaft of the prime mover and the input shaft of the hydraulic pump is placed in a connection chamber that is sealed from the outside atmosphere with a seal, and a liquid is connected to the suction side of the hydraulic pump and the connection chamber. It is characterized by the formation of a passageway.

[Operation] When the hydraulic pump is rotated by the prime mover, the connection chamber is communicated with the suction side of the pump through the liquid passage, so the inside of the connection chamber isolated from the atmosphere becomes negative pressure. When the operation is stopped, hydraulic oil flows into the negative pressure connection chamber through the liquid passage and adheres to the joint of the shaft coupling, lubricating the joint.

When the pump is operated for 1n degrees, the hydraulic oil in the connection chamber is sucked to the suction side of the pump, but when the operation is stopped, the above-mentioned process is repeated to lubricate the hydraulic oil.

[Example] The embodiments shown in the drawings will be described below.

Hydraulic device with! is formed by combining a motor 2, which is a prime mover, and a hydraulic pump 3 of the tooth pump type.

The output shaft 5 of the motor 2 is supported by a bearing 7 of a cylindrical portion 6, and its end portion is located at the opening of the cylindrical portion 6. Kono Saku I
A seal 8 is provided at the eye to prevent liquid from entering the motor 2 from the outside.

The hydraulic pump 3 includes a casing body 9 and a front cover 1.
A drive gear 12 and a driven gear 13 are housed in a meshed state in a pump chamber 11 formed inside the pump chamber 10, and a reduced diameter tip portion 14a of a gear shaft 14 on the side of the drive gear 12, which is an input shaft.
is fitted into and connected to the recess 5a of the output shaft 5 of the motor 2. The rear part of the gear shaft 14, which is an input shaft, is supported in a bearing hole 16 of the casing body 9. Also, driven gear +
The gear shaft 17 of No. 3 is supported in bearing holes 18 and 19 provided in the front cover IO and the casing body 9. 2 in the diagram
0 is a sleeve bearing.

A connection chamber 23 in which a connection portion 22 between the output shaft 5 and the input shaft 14 is located is formed inside the cylindrical portion 6 and the front cover IO, and a connection chamber 23 is formed on the contact surface between the cylindrical portion 6 and the front cover 10. An O-ring 24 is provided which isolates it from the outside atmosphere. Similarly, casing body 9 and front cover I
An O-ring 24 is also provided on the O contact surface. Also,
In front and behind both gears 12 and 13, there is a side plate 2 through which the gear shaft is inserted.
7, 28 are provided, and these side plates and front cover lO
Alternatively, an O-ring 24 is also provided on the contact surface with the casing body 9.

This hydraulic device 1 includes a liquid passage 32, which is not shown by a chain line in FIG.
is provided.

When the hydraulic device 1 is in operation, the pump 3 is rotated by the motor 2, and the liquid sucked in from the suction port is discharged from the discharge port. Since the connection chamber 23 communicates with the suction port of the pump 3 through the liquid passage 32, the pressure inside the connection chamber 23 becomes negative during operation. When the operation is stopped, liquid (hydraulic oil) flows through the liquid passage 32 into the negative pressure connection chamber 23 due to the atmospheric pressure of the liquid holding reservoir (not shown) that communicates with the suction port 30 of the pump 3. Inflow. This liquid does not enter the connecting chamber-cup, but enters up to the shaft connecting portion 22, and the operating shaft is attached to the connecting surface of both shafts. This hydraulic oil lubricates the connecting portion 22.

When the operation is restarted, the hydraulic oil in the connection chamber 23 passes through the liquid passage 32 again and is sucked into the suction side of the gear, but when the operation is stopped, the hydraulic oil flows back through the above-mentioned repetition, and lubrication is performed.

Figures 4 and below show different embodiments. In this example, a liquid passage 40 whose one end communicates with the connection chamber 23 has four through holes that communicate with the core of the gear shaft (input shaft) 14 of the drive gear I2. The bearing hole 16 at the rear end of the input shaft communicates with the suction port 30 via a liquid passage 41. In this example, a seal 43 is also provided between the input shaft 14 of the pump and the front cover 10 to prevent liquid from entering.

Also in this example, the pressure inside the connection chamber 23 becomes negative during operation, and when the engine is stopped, hydraulic oil flows into the connection chamber 23 through the liquid passages 40, 41, so that effective lubrication is performed.

In particular, in this example, due to the action of the seal 43, the hydraulic oil that has entered the -degree connection chamber does not decrease below the level of the liquid passage of the input shaft 14, so the connection parts of both shafts are always submerged in oil, and during operation. Lubrication is also possible inside.

As a further different embodiment, as shown in FIG. 6, a vibrator 45 is installed at the outlet of the liquid path 32 of the embodiment shown in FIG.
It is more effective if the opening is located near the connecting part 22.

[Effects of the Invention] As is clear from the above description, the hydraulic device according to the present invention can effectively lubricate the connection between the output shaft of the prime mover and the input shaft of the pump, and the shaft end It has become possible to significantly extend the life of joints and joints. Unlike conventional devices, this hydraulic device does not require disassembly for greasing, making maintenance less time-consuming.

[Brief explanation of the drawing]

1, 2, and 3 show one embodiment of the present invention.
A partially sectional front view, a partially omitted external view, and a view taken along the line A-A in FIG. FIG. 6 is a sectional view of a main part of a further different embodiment. 1... Hydraulic device 2... Prime mover 2゛ 3...
・Hydraulic pump 22... Connection part 23...
Connection chamber 30... Suction rj 32, 40.41.
...Distribution path patent applicant Shikishimajiru Seisakusho Co., Ltd. Agent Patent attorney Hiroshi Sugawara Figure 3 Figure 6

Claims (1)

[Claims] (1) In a hydraulic device that includes a prime mover and a hydraulic pump and connects the output shaft of the prime mover and the input shaft of the hydraulic pump, a seal is installed on the output shaft side of the prime mover to prevent liquid from entering the prime mover. The connection between the output shaft of the prime mover and the input shaft of the hydraulic pump is placed in a connection chamber that is sealed from the outside atmosphere with a seal, and a liquid A hydraulic device characterized by forming a passage.