JPH0135585Y2 - - Google Patents

Description

[Detailed description of the invention] This invention eliminates the need for centering work and shaft couplings due to its low horsepower, and eliminates the need for centering work and shaft couplings.
The present invention relates to a shaft fitting device for a hydraulic pump and an electric motor, which fittingly connects the rotating shafts of the hydraulic pump.

In this type of device, corrosion due to fretting occurs at the fitting portion between the shaft hole and the rotating shaft, and the hydraulic pump often becomes impossible to remove.
Conventional countermeasures have been to apply oil to the fitting portion or to plate the fitting portion, but these methods have the disadvantage that they do not provide long-term rust prevention effects.

The purpose of the present invention is to improve this problem by using oil in the pump chamber to prevent rust at the fitting part.

To explain this with reference to the illustrated embodiment, reference numeral 1 indicates an electric motor case, and reference numeral 2 indicates a hydraulic pump case. These cases 1 and 2 are connected by a fastener provided at their joint, and an electric rotating shaft 3 on the side of the electric motor case 1 and the pump rotation shaft 4 on the side of the hydraulic pump case 2 are connected to each other by fitting the pump rotation shaft 4 into a shaft hole 5 provided in the electric rotation shaft 3 so as to rotate together with a key 6.

These are the same as the conventional ones, but in the present invention, the pump rotation shaft 4 is inserted into the shaft hole 5.
a fitting recess 9 formed by recessing a fitting protrusion 8 protruding from the joint surface of the pump case 2 into the joint surface of the motor case 1; A connecting portion 10 between both cases 1 and 2 formed by fitting the two cases 1 and 2 surrounds the pump rotating shaft 4 and is sealed at one end with an oil seal 11 on the outer periphery of the electric rotating shaft 3, and at the other end. A communicating oil chamber 13 is provided that communicates with an oil chamber 12 within the pump case 2. In the figure, reference numeral 14 indicates an O-ring provided on the connecting portion 10, reference numeral 15 indicates a bearing of the electric rotating shaft 3, and reference numeral 16 indicates a bearing of the pump rotating shaft 4.

According to the embodiment of the present invention constructed as described above, the fitting portion between the shaft hole 5 and the pump rotating shaft 4 is a grease chamber 7 in the shaft hole 5 that is sealed at the end of the rotating shaft 4. Since the rotary shaft 4 is lubricated by the grease and the oil in the communication oil chamber 13 surrounding the rotary shaft 4, an effective rust prevention effect can be obtained over a long period of time.

In this way, according to the present invention, the pump rotation shaft 4
The shaft hole 5 provided in the electric rotating shaft 3 to fit the
A grease chamber 7 is provided which is sealed by the pump rotating shaft 4, and a connecting portion 10 between both cases 1 and 2 is provided with a grease chamber 7 that surrounds the pump rotating shaft 4 and is sealed at one end with an oil seal 11 on the outer periphery of the electric rotating shaft 3. , the other end is provided with a communication oil chamber 13 that communicates with the oil chamber 12 in the pump case 2, so that the front part of the fitting part between the shaft hole 5 and the pump rotating shaft 4 is connected to the grease in the grease chamber 7. In addition, the rear part thereof is lubricated by the oil in the oil chamber 13, and corrosion due to the fretting phenomenon of the fitting portion can be effectively prevented over a long period of time, and the formation of the grease chamber 7 and the oil chamber 13 is Since it is simple, it has the effect of greatly facilitating removal and assembly of the fitting portion.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of section A in FIG. 2, and FIG. 2 is a side view showing the connected state of the case. 1... Electric motor case, 2... Hydraulic pump case, 3... Electric rotating shaft, 4... Pump rotating shaft, 5
... shaft hole, 7 ... grease chamber, 10 ... connection part,
11...Oil seal, 12...Oil chamber, 13...
Communication oil room.

Claims (1)

[Scope of utility model registration request] In a shaft fitting device for a hydraulic pump and an electric motor, in which a pump rotating shaft 4 on the hydraulic pump case 2 side is fitted and connected to a shaft hole 5 provided in an electric rotating shaft 3 on the motor case 1 side, the inside of the shaft hole 5 is connected. A grease chamber 7 sealed by the pump rotating shaft 4 is provided, and a grease chamber 7 is provided in the connecting portion 10 of both cases 1 and 2, surrounding the pump rotating shaft 4 and having one end sealed with oil on the outer periphery of the electric rotating shaft 3. A shaft fitting device for a hydraulic pump and an electric motor, characterized in that a communicating oil chamber 13 is sealed with a seal 11 and the other end communicates with an oil chamber 12 in the pump case 2.