JPH0547492U - water pump - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the size of water pumps. [Configuration] Spline teeth 5A on the outer peripheral surface of the end of the shaft 5
Is provided, and the spline teeth 7 are provided on the inner peripheral surface of the central hole of the impeller 7.
A is provided, the spline teeth 5A and 7A are slidably meshed in the axial direction of the shaft 5, and the sliding contact members 8A and 8B are fixedly provided at the facing portions of the first body portion 2 and the impeller 7. Sliding contact members 9A and 9B are fixedly provided at the opposing portions of the body portion 3 and the impeller 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a water pump suitable for circulating cooling water of an internal combustion engine.

[0002]

[Prior Art]

 Conventionally, as this type of water pump, for example, the one described in Japanese Utility Model Laid-Open No. 61-62300 is known.

In such a water pump, a shaft is supported by a pump body via a bearing, an impeller is press-fitted and fixed to the shaft, and the impeller is integrated with the shaft.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional water pump, since the impeller is integrated with the shaft, thrust in the direction of the rotation axis generated by the rotation of the impeller is applied to the shaft from the impeller, and the thrust is further transmitted through the shaft bearing to the pump main body. Will be accepted at. Therefore, the bearing of the shaft has to be large and strong so that it can withstand the thrust in the direction of the rotating shaft by the impeller, which causes the problem of increasing the size and cost of the water pump.

Further, since the impeller is press-fitted and fixed to the shaft, there is a possibility that the fixed position of the impeller in the axial direction of the shaft may vary. Therefore, in consideration of the burr, it is necessary to form a sufficiently large clearance between the impeller in the axial direction of the shaft and the inner wall of the pump chamber. There was a problem that it became large in the direction.

An object of the present invention is to provide a water pump which can solve the above-mentioned conventional problems and can be downsized.

[0007]

[Means for Solving the Problems]

 The water pump of the present invention is a water pump in which an impeller is connected to a shaft supported by a pump body via a bearing, and the impeller is not rotatable with respect to the shaft and is movable in the axial direction of the shaft. The pump body is provided with a restricting means for restricting a moving range of the impeller in the axial direction of the shaft.

[0008]

[Action]

 The water pump of the present invention is generated by rotation of the impeller by connecting the impeller to the shaft so as to be movable in the axial direction of the shaft and restricting the moving range of the impeller in the axial direction of the shaft on the pump body side. Avoid applying thrust to the shaft in the direction of the rotation axis. As a result, small and simple shaft bearings can be adopted, and the water pump can be made smaller and less expensive.

Further, the clearance between the impeller and the inner wall of the pump chamber in the axial direction of the shaft can be set small, and the water pump can be further downsized in the axial direction of the shaft.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 is a pump body that forms a pump chamber R therein, and a first body portion 2 and a second body portion 3 on the engine block side of an automobile are integrally connected by bolts. It has been configured. A shaft 5 is supported on the body 3 via a bearing 4, and a drive pulley (not shown) is attached to the outer end of the shaft 5 via a pulley hub 6. An impeller 7 is spline-fitted to the inner end of the shaft 5. That is, a plurality of spline teeth 5A extending in the axial direction and aligned in the circumferential direction are formed on the outer peripheral surface of the inner end of the shaft 5, and on the other hand, on the inner peripheral surface of the central hole of the impeller 7, Spline teeth 7A that mesh with the above-mentioned spline teeth 5A are formed. Therefore, the impeller 7 is coupled to the shaft 5 such that the impeller 7 cannot rotate relative to the shaft 5, and is movable along the axial direction of the shaft 5.

A pair of sliding contact members (for example: Teflon (trade name)) 8A and 8B are fixed to the facing portion of the first body portion 2 and the impeller 7 in the axial direction of the shaft 5. Similarly, a pair of sliding contact members 9A and 9B are fixed to the opposing portion of the second body portion 3 and the impeller 7 in the axial direction of the shaft 5. Therefore, the sliding contact members 8A and 9A on the pump body 1 side are in contact with the sliding contact members 8B and 9B on the impeller 7 side, thereby allowing the impeller 7 to rotate and moving the impeller 7 in the axial direction of the shaft 5. Will be regulated. In the case of this example, the respective sliding contact members 8A, 8B, 9A and 9B are formed in an annular shape, and the sliding contact members 8B and 9B are fixed to both left and right sides of the vane 7B of the impeller 7 in the figure. There is.

An inflow passage 3A for engine cooling water is formed in the body portion 3, and an outflow passage (not shown) for engine cooling water located radially outward of the impeller 7 is formed in the body portion 2. Are formed. A mechanical seal 10 is arranged between the bearing 4 and the impeller 7.

Next, the operation will be described.

By rotationally driving the impeller 7 in one direction by the shaft 5, cooling water of the engine is sucked into the pump chamber R from the inflow passage 3A and discharged from an outflow passage (not shown). The impeller 7 moves in the axial direction of the shaft 5 by the thrust in the rotation axis direction generated by the rotation. Then, when the impeller 7 moves to the right in the figure, the sliding contact member 8B makes sliding contact with the sliding contact member 8A, while when the impeller 7 moves to the left side in the drawing, the sliding contact member 9B slides. Slidingly contacts the contact member 9A.

Therefore, the thrust force of the impeller 7 in the rotational axis direction is received by the sliding contact members 8A and 9A on the pump body 1 side, and does not act on the shaft 5 and the bearing 4. Therefore, a small and simple bearing 4 can be adopted.

Further, the position of the impeller 7 in the axial direction of the shaft 5 is restricted by the two sets of sliding contact members 8A, 8B and 9A, 9B without fixing the impeller 7 to the shaft 5. By reducing the clearance between the impeller 7 and the inner wall of the pump chamber R in the axial direction of the shaft 5, the dimensions of the water pump in the axial direction of the shaft 5 can be reduced.

Further, since the impeller 7 is not press-fitted and fixed to the shaft 5, the impeller 7 having a thin wall such as resin can be adopted.

It should be noted that the shapes and positions of the sliding contact members 8A, 8B, 9A and 9B are not limited to the above-mentioned embodiments. For example, one side of the pair of sliding contact members 8A and 8B and / or one side of the pair of sliding contact members 9A and 9B are configured by a plurality of division members arranged at a predetermined interval along the circumferential direction of the impeller 7. Good. The point is that the range of movement of the impeller 7 in the axial direction of the shaft 5 can be restricted on the pump body 1 side.

[0020]

[Effect of the device]

 As described above, in the water pump of the present invention, the impeller is movably connected to the shaft in the axial direction of the shaft, and the moving range of the impeller in the axial direction of the shaft is restricted on the pump body side. Because of the structure, it is possible to avoid applying thrust to the shaft in the direction of the rotation axis, which is generated by rotation of the impeller. As a result, a small and simple shaft bearing can be adopted, and the water pump can be downsized and the cost can be reduced.

Moreover, the clearance between the impeller and the inner wall of the pump chamber in the axial direction of the shaft can be set small, and as a result, the size of the water pump in the axial direction of the shaft can be reduced to further reduce the size. Can be promoted.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Pump body 2 1st body part 3 2nd body part 4 Bearing 5 Shaft 5A Spline tooth 6 Pulley hub 7 Impeller 7A Spline tooth 7B Vane 8A, 8B, 9A, 9B Sliding contact member 10 Mechanical seal R Pump chamber

Claims (1)

[Scope of utility model registration request] 1. A water pump in which an impeller is connected to a shaft supported by a pump body via bearings, wherein the impeller is non-rotatable with respect to the shaft and is movable in the axial direction of the shaft. A water pump, wherein the pump body is provided with a restricting unit that restricts a moving range of the impeller in an axial direction of the shaft.