JP2016022728A - Welded structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welded structure in which labor and time for production can be reduced.SOLUTION: Provided is a welded structure comprising: a first member 4a made of a resin and a second member 4b; a welded part 12 in which a first pressure-contact face 8 formed at the first member 4a and a second pressure-contact face 11 formed at the second member 4b are mutually welded in mutually pressure-contact conditions; and a first pressing part 13 on the side of the first member 4a and a second pressing part 14 on the side of the second member 4b applied with pressing force of mutually pressure-contacting the first pressure contact face 8 and the second pressure contact face 11, and at least the first pressing part 13 comprises a plurality of projecting parts 16a having pressing faces 13a in which the height H1 from the first pressure-contact face 8 is controlled.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a welded structure having a welded portion in which a first member made of resin and a second member are welded to each other.

Patent Document 1 describes an electric pump including a welding structure in which a pump chamber is formed.
The welded structure includes a resin-made casing corresponding to the first member and a separation plate corresponding to the second member, a first pressure contact surface formed on the casing, and a second pressure contact surface formed on the separation plate. And welded portions welded in pressure contact with each other.
The first pressure contact surface is formed by a tip end surface of a casing side welding projection provided in a ring shape on the casing, and the second pressure contact surface is a tip surface of a separation plate side welding projection provided in a ring shape on the separation plate. It is formed with.

The welding part, for example, supports the separation plate on the fixed base, holds the casing by the chuck member, and presses the first pressure contact surface of the casing side welding projection and the second pressure contact surface of the separation plate side welding projection with each other. The casing and the separation plate are welded in a liquid-tight manner by spin welding that rotates the casing relative to the separation plate.
In this case, the pressing force for bringing the first pressure contact surface and the second pressure contact surface into pressure contact with each other is applied in a direction in which the fixed base and the chuck member face each other.

The pressing force for bringing the first pressure contact surface and the second pressure contact surface into pressure contact with each other is such that the pressure contact surfaces are uniformly pressed over the entire region in order to ensure the welding strength between the bonded surfaces uniformly over the entire region. It is desirable to give to.
For this reason, it has the 1st press part by the side of the 1st member and the 2nd press part by the side of the 2nd member to which the pressing force which mutually presses the 1st press contact surface and the 2nd press contact surface is given.
In the conventional welded structure, the first pressing portion and the second pressing portion are subjected to a process such as cutting the first member and the second member after resin molding of a series of flat pressing surfaces formed in an annular shape. Formed.

JP 2009-221942 A

In the conventional welding structure, the first pressing portion and the second pressing portion to which a pressing force is applied are configured by a flat pressing surface formed in a series of annular shapes.
For this reason, the area | region which processes a 1st member or 2nd member after resin shaping | molding for forming a flat press surface etc. to cutting etc. is wide, and there exists a possibility that manufacture may take an effort.
This invention is made | formed in view of the said situation, Comprising: It aims at providing the welding structure which can reduce the effort of manufacture.

  A characteristic structure of the welded structure according to the present invention is that a first member and a second member made of resin, a first pressure contact surface formed on the first member, and a second pressure contact surface formed on the second member. The first pressing portion on the first member side and the second member side on which the pressing force that presses the welding portion welded in a pressure contact state with each other and the first pressure contact surface and the second pressure contact surface are applied. A second pressing portion, and at least the first pressing portion includes a plurality of convex portions each having a pressing surface whose height from the first pressure contact surface is controlled.

The welding structure of this configuration is configured to include at least the first pressing portion with a plurality of convex portions having pressing surfaces whose heights from the first pressure contact surface are controlled.
That is, each of the first pressing portion and the second pressing portion is not provided with a single pressing surface formed in series, but at least the height of the first pressing portion from the first pressure contact surface is controlled. A plurality of pressing surfaces are provided.

For this reason, in order to form a pressing surface at least in the first pressing portion, it is possible to narrow a region where the first member after resin molding is subjected to processing such as cutting.
Therefore, if it is the welding structure of this structure, the effort of manufacture can be reduced.

  Another feature of the present invention is that the welded portion is spin welded.

  With this configuration, the amount of resin welded on the first pressure contact surface and the second pressure contact surface is ensured by melting by frictional heat between the first pressure contact surface and the second pressure contact surface, and the weld strength of the welded portion is ensured. Can do.

  Another feature of the present invention lies in that the welded portion is provided in a circle around the spin axis and the plurality of convex portions are arranged at equal intervals around the spin axis.

  If it is this structure, the pressing force which mutually presses the 1st press-contact surface and the 2nd press-contact surface can be equally provided over the whole region of a circular welding part at equal intervals, and it welds over a perimeter. A welded portion with high strength reliability can be provided.

  Another feature of the present invention is that at least one of the pressing surfaces is formed at a different height from the remaining pressing surfaces.

  If it is this configuration, even if at least the first member has a shape that cannot provide a pressing surface whose height from the first pressure contact surface is controlled to the same height on all of the plurality of convex portions, It is possible to manufacture a welded structure that easily secures the welding strength between the pressure contact surfaces.

It is sectional drawing of an electric brushless water pump. It is a side view of an electric brushless water pump. It is a top view of an electric brushless water pump. It is an expanded sectional view which shows a welding part. It is a side view which shows the welding method of a pump housing and a motor housing. It is a top view which shows the welding method of a pump housing and a motor housing.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 4 show an electric brushless water pump B provided with a welding structure A according to the present embodiment.
The electric brushless water pump B is installed in a vehicle engine (not shown) to circulate cooling water for engine cooling, and includes a pump unit 1, an electric motor unit 2 that drives the pump unit 1, and an electric motor unit 2. A driver unit 3 to be controlled is provided inside the housing 4.

The housing 4 forms a pump housing 4a made of thermoplastic resin in which the pump portion 1 is accommodated, a motor housing 4b made of thermoplastic resin in which the electric motor portion 2 is accommodated, and a driver chamber 3a in which the driver portion 3 is accommodated. And an aluminum alloy lid case 4c.
The driver chamber 3a accommodates a circuit board 3b to which electronic components constituting the driver unit 3 are connected.

  In the present embodiment, the pump housing 4a corresponds to the first member, and the motor housing 4b corresponds to the second member. A case in which the pump housing 4a and the motor housing 4b are welded corresponds to the welded structure A of the present embodiment.

A pump chamber 1b for accommodating the impeller 1a is formed inside the pump housing 4a. The pump housing 4a is integrally formed with a suction cylinder portion 1c for sucking cooling water from the engine into the pump chamber 1b and a discharge cylinder portion 1d for sending cooling water from the pump chamber 1bc to the engine.
The suction cylinder portion 1c is provided coaxially with the motor rotation axis X, and the discharge cylinder portion 1d is provided along a tangential direction with respect to the suction cylinder portion 1c.

The motor housing 4b is integrally formed with a partition wall 5b that divides the interior of the housing into a rotor chamber 5a and a driver chamber 3a that rotatably accommodates the rotor 5 of the electric motor unit 2 in the direction of the motor rotation axis X.
The stator 2a of the electric motor unit 2 is insert-molded within the thickness of the motor housing 4b. The rotor 5 of the electric motor unit 2 is provided so as to be rotatable together with the impeller 1a. A rotating support shaft 5c that rotatably supports the rotor 5 together with the impeller 1a is supported across the partition wall 5b and the pump housing 4a.

  At the end of the pump housing 4 a on the motor housing side, the outer shape is concentric with the motor rotation axis X and is circular, and the pump side flange 6 is coaxial with the motor rotation axis X along the inner peripheral side of the pump side flange 6. And a concave surface portion 7 that is recessed in an annular shape.

As shown in FIG. 4, the pump-side ridge 6 a and the pump-side ridge 6 a that are concentric with the motor rotation shaft core X and formed in an annular shape are formed on the pump-side flange 6 facing the motor housing 4 b. A peripheral wall 6b formed in an annular shape surrounding the outer peripheral side with a concentric core is integrally formed.
An end face of the pump-side protrusion 6a facing the motor housing 4b forms an annular first pressure contact surface 8.

  At the end of the motor housing 4b on the pump housing side, the outer shape of the motor side flange 9 is concentric and circular with the motor rotation axis X, and the inner diameter of the motor side flange 9 is concentric with the motor rotation axis X. The convex part 10 which protrudes in a shape is formed.

  The motor side flange 9 is formed with the same outer diameter as the pump side flange 6. By fitting the convex surface portion 10 into the concave surface portion 7 so as to be relatively slidable, the pump housing 4a and the motor housing 4b are assembled in a positioning state.

As shown in FIG. 4, a motor-side protrusion 9 a that is concentric with the motor rotation shaft X and formed in an annular shape is integrally formed at a portion of the motor-side flange 9 that faces the pump housing 4 a.
The motor-side protrusion 9a is formed with the same outer diameter and inner diameter as the pump-side protrusion 6a, and the end surface of the motor-side protrusion 9a facing the pump housing 4a side forms the second pressure contact surface 11.

  The welding structure A has a pressing force that presses the first pressure contact surface 8 and the second pressure contact surface 11 to each other, and the weld portion 12 in which the first pressure contact surface 8 and the second pressure contact surface 11 are spin-welded in a pressure contact state. Is provided with a first pressing portion 13 on the pump housing 4a side and a second pressing portion 14 on the motor housing 4b side.

  5 and 6 show a method of spin welding the first pressure contact surface 8 and the second pressure contact surface 11, and grips the pump housing 4 a so as to be rotatable around a spin axis that is concentric with the motor rotation axis X. A chuck member C to be fixed and a fixing base D to fix the motor housing 4b in a non-rotating state are used.

  The fixed board | substrate D mounts and supports the 2nd press part 14 set to the flange surface opposite to the pump side flange 6 side of the motor side flange 9, and fixes the motor housing 4b non-rotatably. The flange surface set in the second pressing portion 14 is formed into a flat and continuous flat surface along a surface orthogonal to the motor rotation axis X by cutting after resin molding.

  The chuck member C presses the first pressing portion 13 set on the flange surface opposite to the motor side flange 9 side of the pump side flange 6 toward the motor housing 4b along the direction of the motor rotation axis X. Three pressing portions 15 are provided.

  The first pressing portion 13 and the second pressing portion 14 apply a pressing force that presses the first press-contact surface 8 and the second press-contact surface 11 together at the time of spin welding, for example, directing the pump housing 4a toward the motor housing 4b with the chuck member C It is provided to give by pressing.

  Then, the first pressure contact surface 8 and the second pressure contact surface 11 are melted by frictional heat generated by the rotation of the pump housing 4a in a state where the first pressure contact surface 8 and the second pressure contact surface 11 are in pressure contact with each other. A circular weld 12 is provided around the spin axis.

  The first pressing portion 13 includes a plurality of convex portions 16a and 16b protruding in the opposite direction to the side where the welded portion 12 exists, a surface opposite to the motor housing side of the pump-side flange 6 and one of the discharge cylinder portions 1d. It is formed integrally with the part. The plurality of convex portions 16a and 16b are arranged at equal intervals around the spin axis.

Each of the tips of the convex portions 16a and 16b is formed on a flat pressing surface 13a along a surface orthogonal to the motor rotation axis X by cutting after resin molding.
The pressing portion 15 included in the chuck member C simultaneously presses the pressing surfaces 13a of the two convex portions 16a and 16b adjacent in the circumferential direction.

The plurality of convex portions 16a provided on the pump side flange 6 includes a pressing surface 13a in which the height H1 from the first pressure contact surface 8 before or after welding is controlled to be a constant height.
The pressing surface 13a of the convex portion 16b provided in the discharge cylinder portion 1d has a height H2 from the first pressure contact surface 8 higher than the height H1 of the pressing surface 13a of the convex portion 16a provided in the pump side flange 6. It is managed at different heights.

  In this way, the pressing portion 15 presses the convex portions 16a and 16b whose heights are controlled. In order to press the pump portion side flange 6 in an appropriate posture, for example, the pressing portion 15 is pressed over the entire circumference of the pump portion side flange 6. There is no need to flatten the surface, and it is only necessary to flatten the surface while controlling the heights of only the convex portions 16a and 16b, so that the production efficiency of the pump-side flange 6 can be increased.

[Other Embodiments]
1. The welded structure according to the present invention has a height from the second pressure contact surface in addition to the first pressure site including a plurality of convex portions each having a pressure surface whose height from the first pressure contact surface is controlled. It may have the 2nd press part which is provided with two or more convex parts which have a press face managed.
2. The welded structure according to the present invention may have a welded portion welded by various welding means such as vibration welding, ultrasonic welding, and heat welding using a heating source.

  INDUSTRIAL APPLICABILITY The present invention can be used for welding structures for various uses other than electric water pumps and electric water pumps.

4a 1st member 4b 2nd member 8 1st press-contact surface 11 2nd press-contact surface 12 Welding part 13 1st press part 13a Press surface 14 2nd press part 16a, 16b Convex part H1 Height from 1st press-contact surface X Spin Shaft core

Claims (4)

A first member and a second member made of resin;
A weld portion in which a first pressure contact surface formed on the first member and a second pressure contact surface formed on the second member are welded to each other in a pressure contact state;
A first pressing part on the first member side and a second pressing part on the second member side to which a pressing force for pressing the first pressing surface and the second pressing surface together is provided,
A welding structure in which at least the first pressing portion includes a plurality of convex portions each having a pressing surface whose height from the first pressure contact surface is controlled.   The welded structure according to claim 1, wherein the welded portion is spin welded. The weld is provided in a circle around the spin axis,
The welding structure according to claim 2, wherein the plurality of convex portions are arranged at equal intervals around the spin axis.   The welded structure according to any one of claims 1 to 3, wherein at least one of the pressing surfaces is formed at the height different from the remaining pressing surfaces.

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