JPH0455270Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of a gear pump.

[Conventional technology]

FIG. 3 is a sectional view showing a conventional example of a gear pump, and FIG. 4 is a sectional view taken along the line B--B in FIG. 3. Based on these drawings, a conventional structural example of this type of gear chamber pump will be explained.

In FIG. 3, 1 is a housing of a gear pump, and the housing 1 is formed with an oil chamber 2, a fluid passage 3, a gear chamber 4, a seal chamber 5, and the like.

A gear chamber 4 is formed in a part of the fluid passage 3 and incorporates a pair of gears 7 and 8 which are coupled to an internal motor shaft 6 thereof. This kind of gear pump is
Drive of the motor 9 rotates gears 7 and 8 via the motor shaft 6, and the rotational force of the gears 7 and 8 forces the oil in the passage 3 to the outlet 16 side. The gear chamber 4 and the seal chamber 5 communicate with each other through a shaft insertion hole 6a, and the motor shaft 6 inserted into the shaft insertion hole 6a is sealed by a shaft seal member 10 fitted into the seal chamber 5. ing.

However, conventionally, the housing 1 has gears 7, 8,
When gear pump parts such as the motor shaft 6 and the shaft seal member 10 are assembled, the following procedure has been used.

That is, the gear chamber 4 is opened in advance at the bottom side of the oil chamber 2, and the seal chamber 5 is opened at the bottom side of the housing 1.
When the opening is opened in a and parts are assembled,
First, the gears 7 and 8 are installed into the gear chamber 4 from above the housing 1 through the bottom of the oil chamber 2. Next, after installing the seal member 10 into the seal chamber 5 from the bottom 1a side of the housing 1, the motor shaft 6
is inserted into the shaft insertion hole 6a through the housing bottom 1a and the seal chamber 5, and the tip of the shaft 6 is assembled into the gear 7. Finally, the cover 11 was fixed to the upper opening of the gear chamber 4 with screws 12 or the like.

[Problem that the invention attempts to solve]

By the way, according to the assembly structure of the gear pump parts as described above, the gear 7,
8 and attach the cover 7, while installing the motor shaft 6 from the lower side (bottom side) of the housing 1.
In order to incorporate the housing 1 and the seal member 10,
It is necessary to repeatedly pull and assemble the parts. Therefore, when assembling the pump, it is difficult to assemble and adjust the housing while the housing is fixed, and the assembly work requires time and effort.

The present invention has been made in view of the above points, and its purpose is to provide a gear pump that can simplify the assembly work of the gear pump.

[Means for solving problems]

The above objective is achieved as follows. Below, in order to facilitate understanding of the content of this invention, the first
The description will be made by referring to the reference numerals of the embodiments shown in FIGS.

In the present invention, a gear chamber 4' is provided in a part of the fluid passage 3 formed in the housing 1, which is the pump body, and a pair of gears 7' and 8 are incorporated into this gear chamber 4'. ' is connected to the shaft 6' of the motor 9, and the rotation of the motor 9 causes a pair of gears 7',
In this gear pump, the gear chamber 4' is bored from the bottom 1a side of the housing 1, and the opening of the gear chamber 4' is connected to the bottom of the housing 1. toward the 1a side,
The housing bottom 1 is located directly below the gear chamber 4'.
A sealing chamber 5' communicating with the gear chamber 4' is formed in a part of a, and the pair of gears 7',
8 through the sealing chamber 5' and the housing bottom 1
A spacer 13 is fitted from the a side and is provided in the seal chamber 5' to block the seal chamber 5' and the gear chamber 4'.
At the same time, the shaft seal member 10 is press-fitted and fixed from the housing bottom 1a through the spacer 13, and the shaft seal member 10 is used to secure the spacer 1.
3 and gears 7', 8 (in the embodiment, the gear 8 side), and concentric shaft insertion holes 14, 15 are formed in the spacer 13 and the shaft seal member 10. 15, a motor shaft 6', one end of which is connected to one of the pair of gears 7', is inserted from the housing bottom 1a side while being sealed by the shaft seal member 10.

[Effect]

With this configuration, all the gear pump components such as the gears 7' and 8, the spacer 13, the shaft seal member 10, and the motor shaft 6' are connected to the gear chamber 4' and the seal chamber from one direction on the housing bottom 1a side. It can be inserted and assembled into a predetermined location of 5'. After assembly, the shaft seal member 10 press-fitted into the seal chamber 5' supports the gear in the gear chamber 4' and the spacer 13 in the seal chamber 5'. Therefore,
The gear, spacer 13, etc. in the gear chamber 4' will not fall.

Further, the outer periphery of the motor shaft 6' is sealed by the shaft seal member 10, thereby preventing liquid leakage from the gear chamber 4' side. Then, due to the rotation of gears 7' and 8 that are interlocked with the motor shaft 6',
The fluid in the fluid passage 3 can be pumped.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 and 2.

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, and FIG. 2 is a sectional view taken along line A-A in FIG. The same reference numerals indicate the same or common elements. Furthermore, the part marked with ' represents an improved element.

That is, in the figure, 1 is a housing, 2 is an oil chamber, 3 is a fluid passage, 4' is a gear chamber, and 5' is a seal chamber.

In this embodiment, the oil chamber bottom 2a at the upper part of the fluid passage 3 has a sufficient wall thickness, and the fluid passage 3
The upper part of the gear chamber 4' formed in a part of the housing 1 is not opened, and the gear chamber 4' is bored from the bottom side of the housing 1.

Further, the seal chamber 5' is formed by a spacer 13, which will be described later.
and a space for accommodating the seal member 10 is secured,
It is formed on the bottom side of the housing 1 in communication with the gear chamber 4'.

The spacer 13 is formed in a shape that fits the upper space of the seal chamber 5', and has a shaft insertion hole 14 formed in the center thereof through which the motor shaft 6' is inserted.

The motor shaft 6' is formed separately from the motor armature shaft and relatively thick, and has a gear cut at its tip, and this tip is used as a gear part 7'.

In this embodiment, the gear pump is assembled in the following manner.

First, open the opening 1 at the bottom of the housing 1 into the gear chamber 4'.
a. The gear 8 is rotatably mounted through the seal chamber 5', and the spacer 13 is inserted into the upper part of the seal chamber 5' so as to cover the lower opening of the gear chamber 4'.
Next, the shaft seal member 10 is press-fitted and fixed into the lower part of the seal chamber 5'. The gear 8 and the spacer 13 are supported by a press-fitted shaft seal member 10 and are prevented from falling. A shaft insertion hole 15 is formed in the center of the shaft seal member 10.
The insertion hole 14 on the spacer 13 side is set to be concentric with the spacer 13 side. Then, the housing bottom opening 1
a. The motor shaft 6' is inserted through the shaft insertion holes 15 and 14 until its gear portion 7' reaches the gear chamber 4'. Due to this shaft insertion, the gear part 7' meshes with the gear 8 in the gear chamber 4', and at the same time,
The lower outer periphery of the shaft 6' contacts the shaft seal member 10 to prevent fluid (oil) from leaking when the shaft rotates.

In the gear pump assembled in this way, when the motor shaft 6' is rotated by the motor 9, the gear part 7' at the tip of the shaft and the gear 8 meshing therewith rotate, and the oil in the fluid passage 3 is discharged. 1
Force feed to the 6th side.

According to this embodiment, the gear 4', the spacer 13, the shaft seal member 10, and the shaft 6' with the gear 7' are all moved in the same direction, that is, from the bottom 1a side of the housing 1 into the gear chamber. 4′,
Since it can be assembled into a predetermined location such as the seal chamber 5', the gear pump parts can be assembled with the housing 1 fixed. Therefore, the gear pump assembly work can be simplified.

Further, the spacer 13 and the shaft seal member 10 can sufficiently prevent liquid leakage from the gear chamber 4' side.

Furthermore, in this embodiment, since the gear portion 7' is formed integrally with the motor shaft 6', the gear portion 7' meshes with the gear 8 at the same time when the motor shaft 6' is inserted, so that the gear and the motor shaft cannot be separated. It is possible to streamline the parts assembly work compared to forming the parts separately.

[Effect of idea]

As described above, according to the present invention, gears, spacers, shaft seal members, motor shafts, etc. can be inserted and assembled into predetermined locations of the housing from the same direction, so parts can be assembled while fixing the housing. As a result, the assembly work of the gear pump can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A' in Fig. 1, Fig. 3 is a longitudinal sectional view showing a conventional example of a gear pump, and Fig. 4. is a sectional view taken along line B-B' in FIG. 3; 1 is a housing, 1a is a housing bottom, 3 is a fluid passage, 4' is a gear chamber, 5' is a seal chamber, 6' is a motor shaft, 7' and 8 are gears, 9 is a motor,
10 is a shaft seal member, 13 is a spacer, 14,1
5 is a shaft insertion hole.

Claims (1)

[Claims for Utility Model Registration] (1) A gear chamber is provided in a part of the fluid passage formed in the housing that is the pump body, a pair of gears is installed in this gear chamber, and one of the pair of gears is connected to the shaft of a motor. In the gear pump, the gear chamber is bored from the bottom side of the housing, and the gear chamber is bored from the bottom side of the housing, and the pair of gears are coupled with each other by the rotation of the motor to pump the fluid in the fluid passage. The opening of the chamber is directed toward the bottom side of the housing, and a seal chamber communicating with the gear chamber is formed in a part of the bottom of the housing directly below the gear chamber, and the pair of gears are disposed in the gear chamber. is fitted from the bottom side of the housing through the seal chamber, and a spacer is installed in the seal chamber to block the seal chamber and the gear chamber, and the shaft seal member is fitted from the bottom side of the housing through the spacer. The spacer and the gear are press-fitted and fixed, and the spacer and the gear are supported by the shaft seal member, and a concentric shaft insertion hole is formed in the spacer and the shaft seal member,
A gear pump characterized in that a motor shaft, one end of which is connected to one of the pair of gears, is inserted into these shaft insertion holes from the bottom side of the housing while being sealed by the shaft sealing member. (2) Utility Model Registration Claim 1. The gear pump according to claim 1, wherein the motor shaft and one of the pair of gears are integrally molded.