Axial alignment structure for fluid pressure pump

Patent metadata

Field	Value
Publication number	US-10767657-B2
Application number	US-201815892969-A
Country	US
Kind code	B2
Filing date	Feb 9, 2018
Priority date	Mar 16, 2017
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

An axial alignment structure for a fluid pressure pump ( 100 ) includes: a first housing made of a resin; and a second housing made of a resin, in which a housing is configured in a state where the first housing and the second housing are joined to each other by thermal welding at a welding position, and a pump rotor is accommodated in the housing, and the first housing and the second housing have an axial alignment mechanism that axially aligns the first housing and the second housing such that axes of the first and second housings coincide with each other at the time of joining of the first housing and the second housing to each other by the thermal welding.

First claim

What is claimed is:

1. An axial alignment structure for a fluid pressure pump comprising:
a first housing made of a resin; and
a second housing made of a resin, wherein
a housing is configured in a state where the first housing and the second housing are joined to each other by thermal welding at a welding position, and a pump rotor is accommodated in the housing, and
the first housing and the second housing include an axial alignment mechanism that axially aligns the first housing and the second housing such that axes of the first and second housings coincide with each other at the time of joining of the first housing and the second housing to each other by the thermal welding,
the first housing includes a first abutment portion which is radially inward from an inner circumferential side of the welding position, the first abutment portion having a first annular shape that extends in an axial direction of the first housing,
the second housing includes a second abutment portion having a second annular shape that extends in an axial direction of the second housing, the second abutment portion being configured to contact the first abutment portion, and
the axial alignment mechanism is configured such that in a flat cross-section respectively along the axial direction of the first housing and the axial direction of the second housing one of the first abutment portion and the second abutment portion includes a first curved surface, and a remaining one of the first abutment portion and the second abutment portion includes a first tapered shape or a second curved surface.

2. The axial alignment structure for a fluid pressure pump according to claim 1 ,
wherein the first housing includes a first welding portion which extends in the axial direction of the first housing and is joined with the second housing at the welding position,
the second housing includes a second welding portion which comes into press contact with the first welding portion, and
the axial alignment mechanism is configured such that one of the first welding portion and the second welding portion includes a third curved surface, and a remaining one of the first welding portion and the second welding portion includes a second tapered shape or a fourth curved surface.

3. The axial alignment structure for a fluid pressure pump according to claim 1 ,
wherein the first housing includes a first pressing part to which pressing force is applied toward the welding position,
the second housing includes a second pressing part to which pressing force is applied toward the welding position,
a first pressing member including a first pressing portion configured to press the first pressing part and a second pressing member including a second pressing portion configured to press the second pressing part are provided, and
the axial alignment mechanism is configured such that one of the first pressing part and the first pressing portion includes a third curved surface and a remaining one of the first pressing part and the first pressing portion includes a second tapered shape or a fourth curved surface, and such that one of the second pressing part and the second pressing portion includes a fifth curved surface and a remaining one of the second pressing part and the second pressing portion includes a third tapered shape or a sixth curved surface.

4. An axial alignment structure for a fluid pressure pump comprising:
a first housing made of a resin; and
a second housing made of a resin, wherein
a housing is configured in a state where the first housing and the second housing are joined to each other by thermal welding at a welding position, and a pump rotor is accommodated in the housing, and
the first housing and the second housing include an axial alignment mechanism that axially aligns the first housing and the second housing such that axes of the first and second housings coincide with each other at the time of joining of the first housing and the second housing to each other by the thermal welding,
the first housing includes a first abutment portion which is radially inward from an inner circumferential side of the welding position, the first abutment portion having a first annular shape that extends in an axial direction of the first housing,
the second housing includes a second abutment portion having a second annular shape that extends in an axial direction of the second housing, the second abutment portion being configured to contact the first abutment portion,
the axial alignment mechanism is configured such that one of the first abutment portion and the second abutment portion includes a first curved surface, and a remaining one of the first abutment portion and the second abutment portion includes a first tapered shape or a second curved surface,
the first housing includes a first pressing part to which pressing force is applied toward the welding position,
the second housing includes a second pressing part to which pressing force is applied toward the welding position,
a first pressing member including a first pressing portion configured to press the first pressing part and a second pressing member including a second pressing portion configured to press the second pressing part are provided, and
the axial alignment mechanism is configured such that one of the first pressing part and the first pressing portion includes a third curved surface and a remaining one of the first pressing part and the first pressing portion includes a second tapered shape or a fourth curved surface, and such that one of the second pressing part and the second pressing portion includes a fifth curved surface and a remaining one of the second pressing part and the second pressing portion includes a third tapered shape or a sixth curved surface.

Assignees

• Aisin Seiki

Inventors

• Kumagai Hiroaki
• Ogawa Hiroomi

Classifications

• B29L2031/7496

  Pumps · CPC title

• B29C65/20

  with direct contact, e.g. using "mirror" · CPC title

• F04D29/026

  especially adapted for liquid pumps · CPC title

• B29C66/124

  Tongue and groove joints · CPC title

• B29C65/0672

  Spin welding · CPC title