JPH0513958Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to a lubrication structure for lubricating a bearing inside a supercharger installed in an intake system of an internal combustion engine.

(Prior art) As a supercharger that constitutes the intake system of an internal combustion engine and is installed in the intake system for the purpose of increasing the amount of air charged and increasing the output of the engine, there is a supercharger as shown in Fig. 4, for example. There is.

That is, in FIG. 4, the casing 5 of the supercharger
A driving shaft 52 and a driven shaft 53 are provided in the interior of the shaft 1, and these are connected to bearings 54, 63 and 55, 6.
4, each is rotatably installed.

A rotor 56 is fixed to the drive shaft 52, and a rotor 57 is fixed to the driven shaft 53. The rotors 56 and 57 are configured to rotate synchronously while meshing with each other, so that the air sucked in from the suction port can be supplied under pressure to the outside through the discharge port on the opposite side.

In order to rotate the rotors 56 and 57 synchronously, a pair of timing gears 58 and 59 are installed at the right end of the drive shaft 52 and the right end of the driven shaft 53 in the drawing. Oil chambers 66 and 61 for sealing lubricating oil are respectively formed inside a rear cover 60 that covers the rear part of the casing 51 and a front cover 65 that covers the front part of the casing 51. Each bearing 54, 55, 63, 6 due to oil O in 66, 61
4 lubrication is achieved.

In addition, both sides of the bearing 64 and the bearing 54,
An oil seal 62 is provided inside each of the parts 55 and 63 to prevent oil from flowing out.

An oil splasher plate 70 is provided on the left side of the bearing 64. This oil splasher plate 70 is connected to the drive shaft 52.
It is fixed between the nut 71 and the inner race of the bearing 64 by a nut 71 screwed into the bearing 64 .

An oil seal 62 is provided on the left side of the nut 71, and is connected to the drive shaft 52 and the front cover 6.
There is a seal between 5 and 5.

The left end portion of the drive shaft 52 has a small diameter, and the step portion 52a and the clutch plate 7 are formed to have a small diameter.
A return spring 72 is interposed between the clutch plate 73 and the right end portion of the clutch plate 73 to bias the clutch plate 73 leftward.

(Problems with conventional technology) By the way, in such a conventional structure,
Stepped portion 52a that holds return spring 72
In order to provide the drive shaft 52, the diameter of the drive shaft 52 had to be reduced, which caused the problem that the strength of this portion was weakened.

(Means for solving the problem) Therefore, in this invention, in view of the above problems,
A seal holding surface for holding an oil seal is provided on the outer periphery of a nut that fixes the oil splatter plate, and a spring holding surface capable of holding a return spring is further provided at the left end of this nut. It is something to do.

(Function) By using a nut to hold the spring, there is no need to reduce the diameter of the drive shaft.

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

In FIG. 1, 1 indicates a drive shaft, which is rotatably supported by bearings 2 and 3 provided near one end (right side in the figure) and the other end (left side in the figure). There is. A driven shaft 4 is provided above the drive shaft 1, and both ends of the driven shaft 4 are rotatably supported by bearings 5 and 6. A plurality of rotors 7 and 8 are fixed on the side circumferential surfaces of the drive shaft 1 and the driven shaft 4, respectively, and these rotors compress and feed air while rotating synchronously by timing gears 9 and 10, which will be described later. It is becoming possible to do so.

A lower timing gear 10 and an upper timing gear 9 are attached to the right end portions of the drive shaft 1 and driven shaft 4 by bolts 11 and 12, respectively. The upper timing gear 9 and the lower timing gear 10 are meshed with each other, and the drive shaft 1
When the rotors 7 and 8 rotate, the rotation is transmitted from the lower timing gear 10 to the driven shaft 4 via the upper timing gear 9, so that the rotors 7 and 8 rotate synchronously.

The rotors 7 and 8 are housed inside a main body case 13. Further, the bearings 2 and 5 are fixed to the front side wall 13a of the main body case 13. An oil seal 33 and an oil seal 29 are provided on both sides of the bearing 2, and an oil seal 34 is provided on the right side of the bearing 5.

The right end of the main body case 13 is covered by a rear side wall 14, and a rear cover 15 is provided outside of this (on the right side in the figure). The rear cover 15 is configured to house the upper timing gear 9 and the lower timing gear 10 therein, and is also configured to form a rear oil chamber 16 with the rear side wall 14.

The bearings 3 and 6 are fixed to a rear side wall 14, and an oil seal 17 is provided between the rear side wall 14 and the drive shaft 1 and driven shaft 4.
18 is interposed.

Next, a front cover 1 is provided on the left side of the front side wall 13a.
9 is provided. This front cover 19 is oil-tightly fixed and forms a front oil chamber 20 with the front side wall 13a.

An inner race of a bearing 21 is fixed to the outer peripheral surface of the left end of the front cover 19, and a clutch body 22 is fixed to the outer race of the bearing 21. A coil 23 is provided inside the clutch body 22, and this coil 2
3 is excited, the clutch body 22 generates magnetic force. In addition, coil 2
3 is fixed to the front cover 19 by a support plate 31.

A clutch plate 24 formed in the shape of a disk is provided adjacent to the left side of the coil 23. This clutch plate 24 is a clutch mounting plate 2 spline-fitted to the left end of the drive shaft 1 so as to be movable from side to side as shown in the figure.
It is fixed to 5. The clutch mounting plate 25 is biased toward the left in the figure by a return spring 27 whose one end is supported by a nut 26, which will be described later.

An oil splasher plate 28 is provided on the left side of the bearing 2 that supports the vicinity of the other end of the drive shaft 1.

The oil splasher plate 28 is formed into a disk shape with a plurality of scraping blades on the outer periphery, and is connected to the inner race between the nut 26 and the bearing 2 by means of a nut 26 screwed onto the drive shaft 1. It is fixed between.

Reference numeral 30 denotes an oil pocket provided adjacent to the bearing 5, and is configured to collect oil scooped up by the oil splasher plate 28 in an oil reservoir portion bent into a substantially L-shape. has been done. (This allows bearing 5
lubricity is improved. ) The main body case 13 has oil passages 35, 35.
is provided. This is the rear oil chamber 16
This is for communicating between the front oil chamber 20 and the front oil chamber 20.
In this example, two are provided in the upper and lower parts of the main body case 13 in the horizontal direction. Incidentally, the oil passage 35 provided in the upper part is the bypass passage 35a, 35.
The rear oil chamber 16 communicates with the upper part of the front oil chamber 20 via b.

Subsequently, the main parts of this embodiment will be explained.

The nut 26 has a hexagonal nut body 26c as shown in FIGS. 2 and 3, and the nut body 26c is formed on the left side of this.
A cylindrical seal holding surface 26a having a smaller diameter than 6c is integrally formed, and a tapered spring holding surface 26b is provided to the left of this.

This nut 26 is screwed onto a male thread 1a formed on the left side of the drive shaft 1, and holds the oil splasher plate 28 between it and the left end of the inner plate of the bearing 2. There is.

An oil seal 29 is interposed between the seal holding surface 26a and the front cover 19, and a return spring 27 can be held between the right end of the clutch mounting plate 25 and the spring holding surface 26b. .

Subsequently, the action and effect will be explained.

A drive belt (not shown) for transmitting power from a drive source is placed around the outer periphery of the clutch body 22, and the clutch body 22 is thereby rotated.

When current is supplied to the coil 23 in this state,
The clutch plate 24 is moved to the clutch body 2 by electromagnetic force.
2, the rotation of the clutch body 22 is transmitted to the drive shaft 1 and starts rotating.

When the drive shaft 1 starts rotating, the rotor 7 rotates and the rotation is transmitted to the driven shaft 4 via the lower timing gear 10 and the upper timing gear 9, and the rotor 8 rotates synchronously with the rotor 7.

Due to the synchronous rotation of the rotors 7 and 8, air is compressed and fed.

On the other hand, a predetermined amount of oil is sealed in the rear oil chamber 16 in advance, and when the lower timing gear 10 rotates, the oil in the rear oil chamber 16 is splashed up to lubricate the bearings 3 and 6. .

Similarly, on the front oil chamber 20 side, the drive shaft 1
As the oil splatter plate 2 rotates,
8 rotates and splashes up the oil sealed in the front oil chamber 20, so that the bearings 2 and 5 are lubricated.

By the way, in the past, in order to support the return spring 72, there was a problem in that a portion of the drive shaft 1 had to be chamfered to make the diameter thinner.
However, in this example, the diameter of a part of the nut 26 is reduced to form a seal holding surface 26a for holding one end of the oil seal 29, and a tapered spring is formed on the left end surface. Since the holding surface 26b is formed, there is no need to chamfer a portion of the drive shaft 1 to make the diameter thinner, and there is no lack of strength.

(Effects of the invention) As explained above, according to the invention, a seal holding surface for holding an oil seal is provided on the outer periphery of the nut that fixes the oil splatter plate, which improves oil leakage from the drive shaft. In addition, since the end of this nut is provided with a spring holding surface that can hold the return spring, there is no need to form a step on the drive shaft to hold the return spring. The feature is that sufficient rigidity of the drive shaft can be ensured.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an example of the overall configuration of the supercharger, Fig. 2 is a plan view showing the nut, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is a conventional example. FIG. 1... Drive shaft, 2, 3, 5, 6... Bearing, 13... Body case, 16... Rear oil chamber, 20... Front oil chamber, 26... Nut, 2
6a...Seal holding surface, 26b...Spring holding surface, 27...Return spring, 28...Oil splasher plate, 29...Oil seal.

Claims (1)

[Scope of utility model registration request] A driven shaft rotatably supported at both ends by bearings and having a plurality of rotors fixed on the side circumferential surface, and a driven shaft rotatably supported by bearings at one end and the vicinity of the other end and the side circumferential surface. A drive shaft having a plurality of rotors fixed thereto, a timing gear fixed to one end of the drive shaft and a driven shaft, respectively, and the bearing formed at the bottom of the main body case supporting the bearing. A front oil chamber and a rear oil chamber for storing lubricating oil; an oil splasher plate provided adjacent to a bearing that supports the drive shaft near the other end; and the oil splasher plate. A type of overdrive consisting of a nut for fixing the plate, a clutch for turning on and off the power transmitted from the drive source to the drive shaft, and an oil seal for preventing oil leakage from the drive shaft. In the feeder, a seal holding surface for holding the oil seal is formed on the outer peripheral surface of the nut,
A lubrication structure for a supercharger, characterized in that a spring holding surface for biasing the clutch is formed on an end surface of the nut.