JPH074897U - Water pump structure - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a structure of a water pump in which the reduction in the axial dimension of the water pump does not lead to the expansion of the housing dimension. [Structure] Since the pulley sheet 2 is composed of a mounting boss 2a for the rotating shaft 3 and a flange 2b eccentric from the mounting boss 2a to the impeller 6 side, the pulley 4 is mounted on the flange 2b of the pulley sheet 2. Even when mounted with the bolt 5, there is no bolt protrusion in the direction of the rotating shaft 3.
Further, since the flange portion 2b of the pulley sheet 2 is notched in the axial center direction except for the pulley mounting bolt hole 10, the notched portion 9 attaches the housing 7 to the cylinder block 8. Interference with the work axis of can be avoided. Therefore, it is possible to provide a water pump that saves space without expanding the housing 7 in the radial direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a water pump attached to an engine, and particularly to a space-saving structure of a water pump for an engine which is arranged in a limited space such as an automobile engine.

[0002]

[Prior art]

 FIG. 2A shows a sectional view of a water pump 20 of an automobile engine having a conventional structure. 2A, a pulley 23 is fixed to a pulley seat 22 attached to one end of the rotary shaft 21 by a bolt 24, and the rotary shaft 21 is rotationally driven by a driving force applied to the pulley 23 from a belt (not shown). . This rotary shaft 21 is mounted by a bearing 26a provided in a housing 26, and the housing 26 is bolted to a cylinder block 25 using a mounting hole 27 so that the other end of the rotary shaft 21 can be secured. The impeller 28 fixed to the cylinder block 25 is arranged in the water jacket of the cylinder block 25, and the impeller 28 is rotated by the rotational drive of the rotary shaft 21 to function as a water pump.

[0003]

[Problems to be solved by the device]

 Due to the structure of the engine, the water pump, which obtains the driving force by the belt conduction of the rotation of the engine crankshaft, is located at the front of the cylinder block. Therefore, space saving of the water pump is also an important issue for engines installed in limited spaces such as automobile engines. However, as shown in the above conventional structure, the water pump 20 has a structure in which the impeller 28, the mechanical seal 29, the bearing 30, and the pulley seat 22 are stacked in the rotational axis direction. Will be killed. Therefore, in order to reduce the axial dimension, as shown in FIG. 2B, the pulley seat 31 is enlarged in the radial direction, and the flange portion 31a of the bolt hole portion for attaching the pulley is larger than the diameter of the housing 26. It is conceivable that the bolt 24 for attaching the pulley 35 to the pulley seat 31 is formed so as to be formed so as to be eccentric to the impeller 28 side on the circumference so as not to project. However, when the outer diameter of the pulley seat 31 is increased as described above, the flange portion 31a of the pulley seat 31 interferes with the working axis of the mounting hole 27 of the housing 26 to the cylinder block 25, so that the outside of the housing 26 is closed. The diameter must be increased, and space saving will fail in another direction. Therefore, an object of the present invention is to provide a structure of a water pump in which a reduction in the axial dimension of the water pump does not lead to an increase in the housing dimension.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the means adopted by the present invention is that a pulley seat of a pulley for rotating the rotary shaft is attached to the other end of the rotary shaft with the impeller of the water pump attached to one end, and the rotary shaft is attached to the rotary shaft. In a water pump structure in which a supporting housing is fixed by bolts, the pulley seat is composed of a mounting boss portion for the rotating shaft and a flange portion eccentric from the mounting boss portion to the impeller side. The structure of the water pump is characterized in that the portion except the pulley mounting bolt hole portion is cut out in the axial center direction.

[0005]

[Action]

 According to the present invention, since the pulley sheet is composed of the boss portion for mounting on the rotating shaft and the flange portion eccentric to the impeller side from the mounting boss portion, the pulley is mounted on the flange portion of the pulley sheet by the bolt. The bolt does not protrude in the direction of the rotation axis even when In addition, since the portion of the pulley seat, excluding the pulley mounting bolt hole portion, is cut out in the axial center direction, the cutout portion prevents interference of the housing mounting hole with the work shaft. . Therefore, it is possible to provide a water pump that saves space without expanding the housing in the radial direction.

[0006]

【Example】

 Embodiments embodying the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. It should be noted that the following embodiments are examples of embodying the present invention and do not limit the technical scope of the present invention. FIG. 1 is a front view (a) of the water pump according to the embodiment of the present invention and a sectional view (b) taken along the line AA of the water pump. In FIG. 1, the water pump 1 is configured by attaching an impeller 6 to one end of a rotary shaft 3 supported by a housing 7 and a pulley seat 2 to the other end. The water pump 1 is fixed to the cylinder block 8 by bolting using mounting holes 9, 9 ... Formed in the housing 7. A pulley 4 is attached to the pulley sheet 2 with bolts 5 as shown in FIG. As shown in the drawing, the pulley sheet 2 is configured to include a boss portion 2a attached to the rotary shaft 3 and a flange portion 2a eccentric to the impeller 6 side with respect to the boss portion 2a. The outer diameter of the portion 2a is larger than that of the conventional structure shown in FIG. Further, the flange portion 2b is formed in a shape in which other portions except the bolt hole portions 10a, 10a, 10a in which the pulley mounting bolt holes 10, 10, 10 are formed are notched in the radial direction. With the above configuration, the bolt 5 for attaching the pulley 4 to the pulley seat 2 does not project from the end portion of the water pump 1, and it is possible to prevent the dimensional expansion in the direction of the rotating shaft 3. Further, since the flange portion 2b of the pulley seat 2 is provided with a notch, when the water pump 1 is attached to the cylinder block 8, the work shaft of the attachment holes 9, 9 ... When the pulley seat 2 is rotated so that the notch part comes, it is possible to carry out the installation work without hindering the work of inserting the work tool (for example, driver or wrench) into the installation holes 9, 9. it can. Therefore, even if the outer diameter of the pulley seat 2 is increased, it is not necessary to increase the outer diameter dimension of the housing 7, and the water pump 1 that realizes space saving can be configured.

[0007]

[Effect of device]

 As described above, according to the present invention, the pulley seat is composed of the boss portion for mounting on the rotary shaft and the flange portion eccentric to the impeller side from the mounting boss portion. Even when the pulley is attached with bolts, there is no bolt protrusion in the direction of the rotation axis. In addition, since the portion of the pulley seat other than the pulley mounting bolt hole portion is cut out in the axial center direction, the cutout portion serves as a working axis for the mounting hole to the cylinder block of the housing. Interference can be avoided. Therefore, it is possible to provide a water pump that saves space without expanding the housing in the radial direction.

[Brief description of drawings]

FIG. 1 is a front view (a) showing a configuration of a water pump according to an embodiment of the present invention and a sectional view (b) taken along the line AA of the figure.

FIG. 2 is a sectional view showing a configuration of a water pump according to a conventional example.

[Explanation of symbols]

 1 …… Water pump 2 …… Pulley sheet 2a …… Boss portion 2b …… Flange portion 3 …… Rotary shaft 4 …… Pulley 5 …… Bolt 6 …… Impeller 7 …… Housing 8 …… Cylinder block 9 …… Installation Hole 10 …… Bolt hole for pulley installation 10a …… Bolt hole part

Claims (1)

[Scope of utility model registration request] 1. A rotary shaft having a water pump impeller attached to one end thereof and a pulley sheet of a pulley for rotationally driving the rotary shaft attached to the other end thereof, and a housing for axially supporting the rotary shaft fixed by bolts. In the structure of a water pump, the pulley seat is composed of a boss portion for mounting on the rotary shaft and a flange portion eccentric to the impeller side from the mounting boss portion, and a pulley mounting bolt hole portion of the flange portion is formed. The structure of the water pump is characterized in that the removed part is cut out in the axial center direction.