JPH0658197U - Water pump - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a water pump which is lightweight and has an inexpensive pump housing in which the positioning and centering of the shaft system are accurately maintained and liquid tightness is guaranteed. [Structure] A bearing press-fitting portion (11A), a male screw portion (11B) in which a male screw is engraved on an outer peripheral portion, a splice portion (11C) which can be fitted to the outer peripheral portion, and a positioning portion which is extended in a radial direction. A first member (11) obtained by press-molding (11D)
And a second member (12) obtained by press-molding a female screw part (12C) having a female screw threaded thereon, a fitting part (12B) fitted to the anchor part (11C), and a seal part (12A). In combination there is a pump housing (10) with a seal ring between the positioning part and the seal part.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a water pump, and more particularly to a water pump used for circulating cooling water in an internal combustion engine for vehicles.

[0002]

[Prior art]

 A conventional water pump of this type is disclosed in, for example, Japanese Utility Model Laid-Open No. 59-107999. In this example, when a metal material is pressed in order to reduce the weight of the pump housing, the main member and the sub-member are separately formed, and these members are press-fitted to each other and integrally joined to form a housing. It is an example. In addition, as shown in FIG. 2, there is also one in which only the main member on the side directly attached to the cylinder block is formed by press working. Here, 1 is an impeller of a water pump, 2 is its impeller shaft, 3 is a roller bearing, 4 is a mechanical seal, and 5 is a pulley for driving the pump. In this example, the outer cylinder 3A of the roller bearing 3 is extended to the mechanical seal 4 side, and the extending portion 3B is press-fitted and welded to the pump housing main member 6 by press molding to maintain liquid tightness. The mechanical seal 4 is held inside the extending portion 3B as well as dripping.

[0003]

[Problems to be solved by the device]

 However, in the case where the pump housing is configured by joining the main member and the sub-member formed by press working as in the above-mentioned conventional example, it is sufficient to press the sub-member into the main member in order to press them together. It is necessary to have rigidity, and the plate thickness is inevitably thick, which goes against the purpose of lightweight. Further, as in the example shown in FIG. 2, the outer cylinder extending portion 3B of the roller bearing 3 is press-fitted into the socket portion 6A of the pump housing main member 6, and welding is performed around the press-fitting end portion in order to maintain liquid tightness. In the case of what is applied, there is a risk that the shaft center of the impeller shaft 2 may be misaligned due to deformation caused by welding.

The object of the present invention is to focus on the above-mentioned conventional problems, and to make the pump housing light in weight, accurately maintaining the positioning and centering of the shaft system, and ensuring a sufficient liquid tightness. It is to provide a water pump having a plug.

[0005]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention provides a cylindrical bearing press-fitting part into which a bearing is press-fitted, a male screw part having a diameter enlarged from the bearing press-fitting part and a male screw threaded on the outer peripheral part thereof, and the male screw part. The first member, in which the diametrically expanded bellows portion that can be fitted to the outer peripheral portion and the positioning portion that is extended in the radial direction are sequentially formed by press working in the impeller axis direction, are screwed to the male screw portion. Female screw portion, a fitting portion fitted to the anchor portion, and a second member formed by press working of a seal portion extending in the radial direction, and the positioning portion. And a pump housing having a seal ring between the seal portion and the seal portion.

[0006]

[Action]

 According to the present invention, while the male screw portion of the first member is screwed with the female screw portion of the second member, the fitting portion of the second member is fitted to the anchor portion of the first member for radial positioning. Further, the sealing portion of the second member is brought into contact with the positioning portion of the first member to keep the sealing member more watertight, and axial positioning is performed to fix the above-mentioned screwing portion, thereby making it lightweight and An inexpensive pump housing can be constructed.

[0007]

【Example】

 Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In this example, the pump housing 10 is constructed by assembling two members, a first member 11 and a second member 12. In addition, both the first member 11 and the second member 12 are mainly pressed, and a cutting process including a screw process is required for a part of them, which reduces the weight of the entire pump housing 10. Can be realized.

The first member 11 constitutes a frontmost part of the pump housing 10. The first member 11 has a bearing press-fitting portion 11A into which the ball bearing 3 is press-fitted and a diameter larger than that of the bearing press-fitting portion 11A. In addition, a male threaded portion 11B whose outer peripheral portion is threaded, and an anchor portion 11C which is further expanded in diameter than the male threaded portion 11B and whose outer peripheral portion and inner peripheral portion are finished to have a predetermined diameter. A positioning portion 11D is formed further in the radial direction from the brazing portion 11C. Further, 11E is a ring groove formed in the circumferential direction of the positioning portion 11D, and a seal ring 13 for keeping the liquid tightness between the both members 11 and 12 is fitted into the ring groove 11E.

The second member 12 constitutes a pump wall near the water pump. The second member 12 is also formed mainly by press working as described above. 12A is a seal part having a surface for maintaining liquid tightness with the positioning part 11D of the first member 11, and 12B is formed so as to be narrowed from the seal part 12A in the axial direction of the impeller shaft 2. The inner peripheral part is a fitting part finished so as to be fitted to the outer peripheral part of the anchor part 11C of the first member 11. Further, 12C is a female screw portion in which a female screw is formed so as to be screwed into the above-mentioned male screw portion 11B of the first member 11.

In assembling such a pump housing 10, first, an adhesive is applied to the thread forming portions of the male screw portion 11B of the first member 11 and the female screw portion 12C of the second member 12, and both are screwed. While fitting, the fitting portion 12B of the second member 12 is fitted into the anchor portion 11C of the first member 11 while rotating. Then, in the final screwed state, the seal portion 12A of the second member 12 is brought into contact with the positioning portion 11D of the first member 11 so that the seal ring 13 maintains liquid tightness. Since the work of assembling the impeller 1, the impeller shaft 2, the mechanical seal 4, the ball bearing 3 and the like to the pump housing 10 assembled in this way is substantially different from the conventional one, the description thereof will be omitted.

In the pump housing 10 assembled as in this example, bidirectional positioning in the thrust direction is determined by the contact of the seal portion 12A with the positioning portion 11D, and the seal ring 13 provided in this portion is determined. Watertightness is secured by. In addition, for the fitting between the outer peripheral portion of the anchor portion 11C and the fitting portion 12B fitted to the fitting portion 11C, for example, a clearance fit with a clearance of about 50 to 100 μm is adopted, whereby the radial direction by screwing is increased. It is possible to suppress rattling. Furthermore, the screwing of the first member 11 and the second member ensures the strength in the thrust direction, and at the same time, the first member keeps the impeller shaft 2 at the accurate centering position via the ball bearing 3. In addition, the mechanical seal 4 can be held.

In the above-described embodiments, the drain hole and the steam hole provided in the drain chamber 7 formed between the ball bearing 3 and the mechanical seal 4 are not described, but such hole is the first member. 11 and the second member 12 are screwed later, or the bearing press-fitting portion 11A of the first member 11 is slightly extended on the male screw portion 11B side, and the first member 11 is not shown. A substantially radial hole may be formed in the extended portion of the.

[0014]

[Effect of device]

 As described above, according to the present invention, a cylindrical shaft press-fitting portion into which a bearing is press-fitted, a male screw portion having a diameter enlarged from the bearing press-fitting portion and a male screw threaded on the outer peripheral portion thereof, A first member in which a bevel portion which is expanded in diameter from the male screw portion and can be fitted to the outer peripheral portion thereof and a positioning portion which is extended in the radial direction are sequentially formed by press working in the impeller axis direction, and the male screw portion is screwed The second screw member, which is formed by press working the female screw portion that is fitted and fixed, the fitting portion that is fitted to the anchor portion, and the seal portion that is extended in the radial direction, is screwed and fitted together. In addition, since the pump housing is provided with a seal ring between the positioning portion and the seal portion, the thickness of the pump housing can be made thin, and both members can be combined as in the conventional case. Press fit It is not necessary with OMRON will be able to reduce the cost of assembling together with the weight reduction. Further, the seal ring 13 ensures sufficient water tightness between the members 11 and 12.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a conventional configuration.

[Explanation of symbols] 1 impeller 2 impeller shaft 3 ball bearing 4 mechanical seal 10 pump housing 11 first member 11A bearing press-fitting part 11B male screw part 11C mounting part 11D positioning part 11E ring groove 12 second member 12A sealing part 12B fitting Joint part 12C Female thread part 13 Seal ring

Claims (1)

[Scope of utility model registration request] 1. A cylindrical bearing press-fitting portion into which a bearing is press-fitted, a male screw portion whose diameter is enlarged from the bearing press-fitting portion and a male screw is threaded on the outer peripheral portion thereof, and an outer peripheral portion whose diameter is enlarged from the male screw portion. A first member in which a brachable portion that can be fitted to the blade and a positioning portion that extends in the radial direction are sequentially formed by press working in the impeller axis direction; a female screw portion that is screwed into the male screw portion; A fitting portion fitted to the brazing portion and a second member formed by press working a seal portion extending in the radial direction are screwed and fitted together, and a seal is provided between the positioning portion and the seal portion. A water pump having a pump housing comprising a ring.