JPS63154039A - Ac generator with pump - Google Patents

Abstract

PURPOSE:To prevent an irregular wear due to the one side contact of a spline coupling section and a noise from occurring by disposing a bearing between the other end of a rotational shaft of a pump section and one end of a rotational shaft of a generator section. CONSTITUTION:When power is transmitted to a pulley 16, the first rotational shaft 13 of a pump section 10 rotates, it is transmitted through spline coupling sections 18, 41 to the second rotational shaft 35 of a generator section 30, i.e., a pushing shaft 38 and a rotational shaft section 39 to rotate a rotor 42, thereby generating a current. The shaft 13 is supported at its one end 14 by a first bearing 12 held by the casing 11 of the section 10, and at the other end 17 by a second bearing 45 disposed between the other end 17 of the shaft 13 and the pushing shaft 38 of the shaft 37 of the section 30. Accordingly, the shaft 13 is rotated in high centering accuracy with respect to the shaft 35.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a pump-equipped alternator having a pump section and a generator section, and is used to generate negative pressure necessary for, for example, a brake booster of an automobile. This is applicable to alternators equipped with vacuum pumps.

(Prior art) The above-mentioned AC generator with a pump was disclosed in Japanese Patent Application Laid-open No. 59-44.
It is disclosed in Publication No. 947Q. The pump part of the pump-equipped alternator disclosed in the publication includes a casing, a first rotating shaft having one end receiving power,
The first bearing is held in the casing and rotatably supports one end of the first rotating shaft. and,
A male spline is formed at the other end of the first rotating shaft. Further, the generator section of the pump-equipped alternator has a housing that is engaged with the casing of the pump section, and a second rotating shaft that is rotatably supported by the housing. The axis of the second rotating shaft extends coaxially with the axis of the first rotating shaft of the pump section. A female spline is formed at one end of the second rotating shaft adjacent to the other end of the first rotating shaft. The male spline formed at the other end of the first rotating shaft engages the female spline formed at one end of the second rotating shaft, so that the power received at one end of the first rotating shaft is The signal is transmitted to the second rotating shaft.

The above-mentioned configuration in which the first rotating shaft of the pump section and the second rotating shaft of the generator section are spline-coupled to each other prevents an excessive load from being applied to the generator section, and that the brushes of the generator section are connected to the pump section. No r! i. Risk of contamination by lubricating oil can be minimized; generator parts and pump parts of different types and performance can be combined in a variety of ways; heat shielding between pump parts and generator parts; Excellent effects such as being able to enhance the sense of cutting are exhibited.

(Problem to be Solved by the Invention) However, the centering accuracy between the first and second rotating shafts is greatly influenced by the machining accuracy of the spline joint, and if the machining accuracy of the spline joint is low, Problems such as a reduction in the life of the first bearing supporting the first rotating shaft and uneven wear due to uneven contact of the spline joint may occur. Although such problems can be avoided by increasing the machining accuracy of the spline joint, another problem arises: increased costs.

An object of the present invention is to suppress the cost to a low level and achieve the above-mentioned first and second
An object of the present invention is to provide an alternator with a pump that can improve centering accuracy between rotating shafts.

(Means for Solving the Problems) According to the present invention, a second bearing is provided between the other end of the first rotating shaft of the pump section and one end of the second rotating shaft of the generator section. The above problem is solved by a configuration in which the first rotating shaft is supported by the first bearing and the second bearing.

(Function) When one end of the first rotating shaft of the pump part receives power, the first rotating shaft rotates, and the rotation is transmitted to the first rotating shaft of the generator part through the coupling part of the male spline and the female spline. The signal is transmitted to the second rotating shaft. One end of the first rotating shaft is held by a first bearing held in the casing of the pump section, and the other end of the first rotating shaft is connected to one end of the second rotating shaft of the generator section. Since the other end portions are each supported by second bearings disposed in the first rotating shaft, the first rotating shaft rotates with high centering accuracy relative to the second rotating shaft.

(Example) Hereinafter, an AC generator with a pump according to an example of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the pump-equipped alternator has a pump section 10 and a generator section 3o.

The pump section 10 has a casing 11, and a first bearing 12 is held in the casing 11. The first rotating shaft 13 has one end 14, and a pulley 16 is mounted on the one end 14 so as to rotate together with the first rotating shaft 13, such as an internal combustion engine of an automobile (not shown). It is designed to receive power from the One end 14 of the first rotating shaft 13 is supported by the first bearing 12, and a male spline 18 is formed at the other end 17 of the first rotating shaft 13.

The rotor 21 is splined to the male spline 18 of the first rotating shaft 13 so as to rotate together with the first rotating shaft 13 . As shown in FIG. 2, a plurality of vanes 22 are slidably supported on the rotor 21, and these vanes 22 are eccentric to the axis of the first rotating shaft 13. A cylindrical center It! formed inside the casing 11! A plurality of pump chambers 24 in cooperation with 123
is defined. When the first rotating shaft 13 is rotated, negative pressure is generated in the pump chamber 24 which is in the expansion stroke. In this way, the pump section 10 of the illustrated embodiment
is adapted to act as a vacuum pump section.

Returning to FIG. 1, the generator section 30 has a housing 31, and an arcuate protrusion 32 for centering is provided on the end surface of the housing 31. The end of the casing 11 of the pump section 10 is fitted inside the arcuate projection 32 for centering via a plate 33, and is coupled to the housing 31 with bolts 34. A second rotating shaft 35 having an axis extending coaxially with the axis of the first rotating shaft 13 of the pump portion 16 is connected to the housing 3.
1 and supported by a bearing 36 held at the first rotating shaft 1
3 and one end adjacent to the other end 17 of the housing 3.
The other end is rotatably supported by a bearing 3 held at 1. To explain specifically, the second
The rotating shaft 35 includes a bushing shaft 38 supported by a bearing 36, and a rotating shaft portion 39 connected to the bushing shaft 38 by splines, keys, etc. so as to rotate together with the bushing shaft 38. A female spline 41 is formed on the inner peripheral surface of the bushing shaft 38 and engages with a male spline 18 formed on the other end 17 of the first rotating shaft 13. The rotating shafts 13 and 35 of are splined to each other. The bushing shaft 38 is press-fitted into a rotor 42, and the rotor 42 is connected to the bushing shirt 1-3.
It is designed to rotate together with 8.

A second bearing 45 configured as a sliding bearing is provided between the outer peripheral surface of the other end 17 of the first rotating shaft 13 and one end of the second rotating shaft 35, that is, the inner peripheral surface of the bushing shaft 38. The first rotating shaft 13 is rotatably supported by the first bearing 12 and the second bearing 45 described above.

The casing 11 of the pump section 10 is equipped with an oil supply port 51, and the lubricating oil supplied to the oil supply port 51 passes through an axial hole 52 and a radial hole 53 formed in the first rotating shaft 13 to the rotor 21. and into the vane 22 through the axial hole 52 and the radial hole 54 to the spline connection between the first rotating shaft 13 and the bushing shaft 38 and through the axial hole 52 to the second bearing 45, respectively. It is ready to be sent. In order to prevent the lubricating oil from leaking to areas other than those mentioned above, an oil seal 56 is installed between the first bearing 12 and the casing 11, and an oil seal 57 is installed between the plate 33 and the bearing 36. , an O-ring 58 is provided between the bushing shaft 38 and the rotating shaft portion 39, respectively.

Next, the operation of the pump-equipped alternator constructed as described above will be explained. When power is transmitted from an internal combustion engine of a car (not shown) to the pulley 16 via a V-belt (not shown), the first
The rotating shaft 13 rotates, and the vanes 22 supported by the rotor 21 advance and retreat, generating negative pressure in the pump chamber 24 that is in the expansion stroke. served. The rotation of the first rotating shaft 13 is transmitted to the second rotating shaft 35 of the generator section 30, that is, the pushing shaft 38 and the rotating shaft section 39, through the joint between the male spline 18 and the female spline 41, The rotor 42 is rotated to generate electricity. The first rotating shaft 13 has one end 14 held by a first bearing 12 held in the casing 11 of the pump section 10 , and the other end 17 of the first rotating shaft 13 and the second end of the generator section 30 . Bushing shaft 3 of rotating shaft 35
Since the other end portions 17 are each supported by a second bearing 45 disposed between the first rotating shaft 35 and the second rotating shaft 35, the first rotating shaft 13 rotates with high centering accuracy with respect to the second rotating shaft 35. do.

Although the preferred embodiments of the present invention have been described above,
The invention should not be limited to this particular embodiment, but various modifications can be made.

For example, although the pump section 10 has been described as being composed of a vacuum pump section, the pump section 10 may be composed of a transfer pump section or a compression pump section.

Further, although the second bearing 45 is shown and described as a sliding bearing, the second bearing 45 may be a rolling bearing such as a ball bearing or a roller bearing.

(Effects of the Invention) The alternator with a pump according to the present invention includes a second bearing between the other end of the first rotating shaft of the pump section and one end of the second rotating shaft of the generator section. the first bearing by the second bearing and the first bearing held in the casing of the pump section.
Since the first rotating shaft is configured to support a rotating shaft of 2, the first rotating shaft has a high centering mr! with respect to the second rotating shaft. To rotate while maintaining L, to avoid uneven wear and noise due to uneven contact of the spline joint without unnecessarily increasing the machining accuracy of the spline joint, and to maintain a long life of the first bearing. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an alternator with a pump according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 10...Pump part, 11...Casing, 12...
・First bearing, 13... First rotating shaft, 14... One end, 17... Other end, 18... Male spline, 3
o... Generator section, 31... Housing, 35...
Second rotating shaft, 41...Female spline, 45...Second bearing.

Claims (4)

[Claims] (1) In a pump-equipped alternator having a pump part and a generator part, the pump part includes a casing, a first rotating shaft having one end that receives power, and a first rotating shaft held by the casing. a first bearing rotatably supporting one end of the first rotating shaft; a male spline is formed at the other end of the first rotating shaft; The part has a housing coupled to the casing of the pump part, and a second rotating shaft rotatably supported by the housing, and the axis of the second rotating shaft is parallel to the first rotating shaft. a female spline extending coaxially with the axis of the shaft, and forming a female spline at one end of the second rotation shaft adjacent to the other end of the first rotation shaft;
A male spline formed at the other end of the first rotating shaft engages with the male spline, thereby connecting the first and second rotating shafts.
rotating shafts are spline-coupled to each other, a second bearing is disposed between the other end of the first rotating shaft and one end of the second rotating shaft, and a second bearing is provided between the other end of the first rotating shaft and one end of the second rotating shaft. bearing and the second
An alternator with a pump, characterized in that the first rotating shaft is supported by a bearing. (2) The second rotating shaft includes a bushing shaft on which the female spline is formed, and a rotating shaft portion connected to the bushing shaft so as to rotate together with the bushing shaft. The alternating current generator with a pump according to item 1. (3) The alternator with a pump according to claim 1 or 2, wherein the second bearing is a sliding bearing. (4) The pump section has a cylindrical space formed in the casing eccentrically with respect to the axis of the first rotating shaft, and a cylindrical space formed in the casing so as to rotate together with the first rotating shaft. The vacuum pump section includes a mounted rotor and a plurality of vanes that are slidably supported by the rotor and cooperate with the cylindrical space to define a plurality of pump chambers. An alternator with a pump according to any one of claims 1 to 3.