JPH0734177Y2 - Mechanical supercharger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Field of Industrial Application) The present invention is applied to a two-shaft compressor, a vehicle compressor, etc., which has a built-in oil and has a gear lubricated with the oil. It relates to a mechanical supercharger that can be used.

(Prior Art) The conventional lubrication structure for a supercharger proposed in Japanese Utility Model Laid-Open No. 63-90034 will be described with reference to FIG.
Lubricating oil 21 in 20 is a supercharger of a lubrication structure that bounces up using the rotational force of a gear 22 and supplies it to an upper bearing 23, and an upper side is opened to a bearing housing 24 that holds the bearing 23. A pocket is provided, and the oil splashed in the pocket is collected to lubricate the bearing 23.

(Problems to be solved by the invention) However, in the conventional supercharger shown in FIG.
Since 22 is only located in the gear chamber 25, the end face of the gear 22 and the radial gap remain wide as shown in FIGS. For this reason, the oil is lubricated only by the splashing of the gear 22, so that the meshing portion of the gear 22 is not sufficiently lubricated, resulting in a problem of noise such as gear meshing noise and tapping noise. There was also the problem of abnormal wear on the gears.

The present invention is to provide a mechanical supercharger capable of solving the above-mentioned conventional problems by effectively supplying the lubricating oil to the meshing portion of the gear.

[Constitution of device]

(Means for Solving the Problem) For this reason, the present invention is directed to a supercharger having a dimming gear and having lubricating oil of the gear built into a gear chamber, in which the gaps of the end faces of the timing gear and the radial gap are restricted. At the same time, the radial gap is formed so as to become gradually smaller in the rotational direction, which serves as a means for solving the problem.

Further, the present invention is such that the gap between the end faces of the timing gear is regulated by the spacer and the cover fixed to the housing, and this is a means for solving the problem.

Further, according to the present invention, the radial gap of the timing gear is gradually reduced by the inner shape of the cover, and this is a means for solving the problem.

(Operation) As the timing gear rotates, the lubricating oil is rotated by the gear and supplied to the gear meshing portion. At that time, since the gap between the gear end faces is small, the lubricating oil does not flow out to other portions. Further, since the radial clearance is gradually reduced, the flow velocity and pressure of the lubricating oil rise, and the lubricating oil can be effectively supplied to the gear meshing portion.

(Embodiment) The present invention will be described below with reference to the embodiments of the drawings. Figs. 1 and 2 show an embodiment of the present invention in which a rotor 10 is fixed to a shaft 2 which is driven to rotate by a pulley 1. A rotor 11 that meshes with the rotor 10 is fixed to a shaft 12. The shafts 2 and 12 are bearings in the rotor housing 13 and bearings in the bearing housing 7.
Each is rotatably supported by 15. A cover 6 is fixed to the bearing housing 7 with a bolt 16, and the cover 6 forms a gear chamber 5. Gears 3 and 4 are fixed to a protruding portion of the shafts 2 and 12 into the gear chamber 5 in a rotational direction by a key 17 and fixed by a nut 18. Further, 8 is a lubricating oil.

Next, the operation will be described. When the pulley 1 is rotationally driven via a belt by a drive source (not shown) (for example, a motor or an engine), the gear 4 is rotated by rotating the gear 3 via the shaft 2. In the gear chamber 5, the end surfaces of the gears 3 and 4 are sandwiched by the spacer 9 fixed to the bearing housing 7 and the cover 6 so as to maintain a minimum clearance, and as shown in FIG. Since the radial gap δ between the gears 4, 4 and the inner side of the cover 6 is gradually reduced in the gear rotation direction, the lubricating oil 8 is prevented by the gears 3, 4 as the gears 3, 4 rotate. When rotated and supplied to the meshing portion 19 of the gear, the lubricating oil 8 does not flow to other portions due to the small gap between the gear end faces. Further, since the radial clearance δ gradually decreases, the flow velocity and pressure of the lubricating oil rise, and the lubricating oil is effectively supplied to the gear meshing portion 19. FIG. 4 is an explanatory view showing a state of a radial gap between the present invention and a conventional product.

[Effect of device]

Since the present invention is configured as described in detail above,
As in the past, a separate oil pump or the like may be installed outside or inside to complicate the configuration, or the amount of lubricating oil, viscosity, etc. may be changed to cause problems such as increased gear drive resistance, heat generation and deterioration of oil. In addition, since the lubricating oil can be sufficiently supplied to the gear meshing portion with a simple structure and the amount of lubricating oil can be set to be small, problems such as heat generation and increase in drive resistance do not occur at all.

[Brief description of drawings]

FIG. 1 is a side sectional view of a mechanical supercharger showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a side sectional view showing a conventional mechanical supercharger. FIG. 4 is a diagram showing a state of a radial gap between a gear and a cover of the present invention and a conventional product, and FIG. 5 is a sectional view taken along line BB of FIG. Description of main parts of the figure 1 …… Pulley, 2,12 …… Shaft 3,4 …… Gear, 5 …… Gear chamber 6 …… Cover, 7 …… Gear housing 8 …… Lubricant, 9 …… Spacer 10 , 11 …… Rotor, 13 …… Rotor housing 14,15 …… Bearing, δ …… Radial clearance

Claims (3)

[Scope of utility model registration request] 1. A supercharger having a timing gear, the lubricating oil of the gear being contained in a gear chamber, wherein a gap between an end face of the timing gear and a radial gap is restricted,
A mechanical supercharger characterized in that the radial gap is formed so as to become gradually smaller in the rotational direction. 2. The mechanical supercharger according to claim 1, wherein the gap between the end faces of the timing gear is regulated by a spacer fixed to the housing and a cover. 3. The mechanical supercharger according to claim 1, wherein the radial gap of the timing gear is gradually reduced by the inner shape of the cover.