JPH0627780Y2 - Blow-by gas processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a processing device for purifying blow-by gas generated inside an engine without returning it to the outside and returning it to intake air again.

(Prior Art) Various devices are known for returning the purified gas to the intake pipe side again by removing the oil particles contained therein without directly discharging the blow-by gas generated inside the engine to the outside. However, since the main shaft of the separation element and the motor main shaft for driving the separation element are separate and are connected by a joint member,
Since multiple bearings are required for each shaft, the number of parts is large, and it is difficult to align both shafts during assembly.
The slight deviation is unavoidable, and the wear of the bearing on the element main shaft side due to high-speed rotation is remarkable, and frequent replacement is required. Therefore, the applicant of the present invention has proposed a device with both shafts as shown in FIG. Previously, Japanese Utility Model Sho 62-11414 (Japanese Utility Model Sho 63-119,815
No.).

That is, the intake pipe 7 connected to the inside of the engine on one side
A motor case 2 is attached to a lower wall 1a of a cylindrical element case 1 which includes a return pipe 7b connected to an air filter or an intake pipe at the center of the upper wall and a drain pipe 7c connected to an oil pan on the other side. The boss portion 1b extending into the motor case is provided in the central portion of the lower wall.
The cylindrical housing 4 is fitted and fixed to b, the coil c is attached to the outer periphery of the lower part, and the bearings 5a and 5b are press-fitted and attached at upper and lower positions in the housing 4.
The upper part of the non-circular cross section is located in the element case 1 in a and 5b.
An element main shaft 3 (hereinafter simply referred to as a main shaft) to which a separation element e made of an annular material is attached is rotatably supported, and a lower end of the main shaft 3 is provided with a cup-shaped rotary frame 6 via a bush 6a. The rotary frame 6 is provided with a magnet m facing the coil c on the inner surface of the peripheral wall of the rotary frame 6 to form a motor, and a control circuit for controlling the polarity of the motor is installed under the lower wall of the element case. By disposing the embedded substrate 8 and energizing the coil c through the substrate 8, the main shaft 3, that is, the separation element e is rotated at high speed via the rotary frame 6.

To reduce the weight of the device, the cases 1 and 2 are made of synthetic resin or aluminum, and the main shaft 3 is made of stainless steel or bearing steel. On the other hand, the housing 4 supporting the main shaft 3 is made of brass or the like. Bearing 5 made of kana metal
Slide bearings made of sintered oil-impregnated metal are used for a and 5b so that the oil accumulated in the element case 1 does not enter the drive part, and the main shaft 3 has a lower side of the separation element e. The stopper ring 9 is fixed at a position, and the rotating frame 6 attached to the lower end through a bush 6a prevents the main shaft 3 from coming out. Further, the stopper ring 9 is separated from the upper bearing 5a and between the lower bearing 5b and the bush 6a. A thin ring sheet 10 (mainly made of resin) is interposed therebetween to eliminate a gap due to dimensional variation between the upper and lower members.

(Problems to be solved by the invention) In the above device, the element main shaft and the motor main shaft are not separated, but are combined into one, so that the number of parts is small and assembly is possible without the need for troublesome shaft alignment. However, since the material of the main shaft and the cylindrical housing that supports it is different as described above, and the coefficient of thermal expansion is greater in the housing, the temperature of the housing is affected by the hot blow-by gas during use. This will stretch and press the upper stop ring and the lower bush through the sintered metal bearing, and the friction of this portion will increase, adversely affecting the rotation of the element and the rotary frame. On the other hand, if a gap is provided between the stopper and the bush in order to prevent this, vibration is generated in the vertical direction this time, which is unsatisfactory.

Therefore, this device maintains the good separation efficiency of the oil contained in the blow-by gas, allows the tubular housing to expand due to heat during use, prevents damage to the drive part, and prevents the separation element and the main shaft from rotating. An object of the present invention is to provide a blow-by gas processing device that does not cause any trouble.

(Means and Actions for Solving Problems) Based on the above object, the present invention has, as a blow-by gas processing device, a blow-by gas intake pipe on one side and a return pipe at the center of the upper wall. , A motor case is integrally provided on the lower side of the cylindrical element case equipped with an oil drain pipe at the lower part of the other side, and a cylindrical housing having upper and lower bearings is provided at the center of the motor case. A bearing supports the main shaft that extends into the element case, and the upper part of the main shaft is made of a porous annular material, and the center inside communicates with the return pipe and the upper and lower surfaces and the peripheral side surfaces are close to the inner surface of the element case. While the coil is installed on the outer periphery of the lower part of the housing, a rotary frame provided with a magnet facing the coil is installed on the lower end of the main shaft. The upper bearing installed in the housing is a sliding bearing that is free to slide on the main shaft, while the lower bearing is a rolling bearing, and the lower bearing is sandwiched between the stop means provided on the main shaft below the housing and the rotary frame. It is characterized by that.

Then, if the coil is energized and the main shaft is rotated at high speed, the separation element also rotates at high speed, the blow-by gas flowing into the element case through the intake pipe collides with the separation element and crosses it radially, at that time, The oil particles in the gas are captured by the element, the gas from which the oil has been removed is returned to the intake pipe side through the return pipe, while
The oil particles captured by the element gradually aggregate and become large, and are scattered around by the centrifugal action, flow down below the case, and are returned to the oil pan through the drain pipe.

In the meantime, even if the blow-by gas or the heat of the engine affects the cylindrical housing that supports the main shaft, the housing freely extends in the vertical direction and does not press the bearing portion.

(Embodiment) FIGS. 1 and 2 show an embodiment of the present invention, in which 11 is a cylindrical element case, and one side of which is provided with an intake pipe 17a connected to the inside of the engine,
A return pipe 17b connected to the air filter or the intake pipe is provided at the center of the upper wall, and a drain pipe 17c connected to the oil pan is provided at the lower part of the other side. The motor case 12 is attached to the lower side of the lower wall 11a and the center of the lower wall is provided. Formed boss 11
The tubular housing 14 is fitted and fixed to b, and the coil c is attached to the outer periphery of the lower portion of the housing 14 (this is such that the entire housing is covered with the boss portion 11b as described above, and the coil is provided on the boss portion. The bearings 15a and 15b may be provided on the upper and lower sides of the housing 14, and the upper portions of the bearings 15a and 15b having a non-circular cross section are placed in the element case 11 to form an annular porous material. And the upper and lower end plates (however, the upper end plate is not shown, but the central portion is adapted to communicate with the return pipe), and the upper and lower surfaces and the peripheral side surface are close to the inner surface of the element case 11 The rotatably supported main shaft 13 is attached to the lower end of the main shaft 13 by a press-fitting means such as a bush 16a, and a cup-shaped rotary frame 16 is attached to the inner surface of the rotary frame 16. Configure the motor provided Magunetsuto m facing the coil c is the element case lower wall 11
A board 18 for controlling the polarity of the motor is provided on the lower side of a.
Is provided.

However, such a configuration is substantially the same as that described above, and the materials of the cases 11, 12, the main shaft 13, and the housing 14 are also the same as those described above.

By the way, in the first example of the present invention, the cylindrical housing 1
A sliding type upper bearing 15a made of sintered oil-impregnated metal is press-fitted in the upper part of 4 to prevent oil from flowing into the drive part, while an inner ring and an outer ring are provided in the lower part where there is no risk of oil inflow. A rolling type lower bearing 15b which accommodates a required number of balls or rollers is fitted and fixed between
A main shaft 13 is rotatably supported by these bearings 15a and 15b, and a stop ring 19 is fixed to the main shaft 13 at an upper position of a lower bearing 15b, and a rotary frame 16 fixed via the stop ring 19 and a bush 16a.
The lower bearing 15b is sandwiched between and to prevent the main shaft 13 from coming out, and the stop ring 19 and the lower bearing 1
5b and between the bearing 15b and the bush 16a, a ring sheet 20 having a required thickness is provided so as to eliminate gaps due to variations in dimensions between the upper and lower members.

In use, the cases 11 and 12 are set to the required positions on the engine, the intake pipe 17a is inside the engine, the return pipe 17b is on the intake pipe side, and the drain pipe 17 is
If c is communicated with the oil pan and the coil c on the housing 14 is energized, the spindle 13 will move at high speed (3000 to 4000).
rpm), and the separation element e integrated with this rotates at high speed.

The blow-by gas generated inside the engine flows into the case 11 from the side of the element case 11 by the intake negative pressure through the intake pipe 17a, collides with the element e rotating at high speed, and crosses it in the radial direction. In the process, the oil particles contained in the gas are adhered and captured on the surface and the internal tissue of the porous material, and the oil-removed gas is returned to the intake pipe side through the central return pipe 17b. Also, the oil particles captured by the material gradually aggregate and become larger, and are scattered around by the action of centrifugal force and flow down while adhering to the wall surface of the case and drain pipe 17
It is returned to the oil pan from c.

In this case, in this embodiment, since the stopper ring 19 which is a means for preventing the main shaft 13 from coming off is provided not on the upper side of the tubular housing 14 but on the inner lower side thereof, the tubular housing 14 is not restrained from above as in the above device, The lower bearing 15b, which is in a state of freely extending upward and is attached to the lower side of the housing 14, is of a rolling type, and its outer ring has an inner ring even if axial force is exerted through the housing 14. Therefore, even if the housing 14 is affected by blow-by gas or heat of the engine during use, the housing 14 can freely extend with respect to the main shaft 13 and the main shaft 13 and the separation element are not distorted in the shaft support portion. Does not hinder the rotation of e.

3A shows a modified example in which the lower bearing 15b is elastically supported by the spring member 21 attached to the rotor 16 so as to prevent further rattling of the shaft support portion, and FIG. Instead of installing the stopper ring, an inward step portion 19 'is formed, and the inner ring portion of the lower bearing 15b is brought into contact with the step portion 19' with the ring seat 20 interposed therebetween so that the main shaft 13 is prevented from coming out together with the rotor 16. It shows another modified example that is adapted to prevent.

(Effect of the Invention) As described above, in the present invention, since the blow-by gas processing device is configured as described above, the blow-by gas flowing from the intake pipe into the element case is vigorously laterally applied to the rotating separation element. It is possible to collide and to traverse it in the radial direction, and the oil particles in the blow-by gas, regardless of their size, can be sufficiently and reliably trapped by the surface or internal structure of the separation element, and the separation element Since the main shaft and motor main shaft are formed in one unit, it is easy to assemble without the need for complicated operations such as centering, and the expansion of the cylindrical housing supporting the main shaft due to blow-by gas or the heat of the engine Acceptable, the main shaft and the separation element rotate smoothly without distortion in the bearing,
In addition, the sliding bearing in the upper part of the cylindrical housing can prevent the separated oil from flowing into the motor case,
It can be used for a long time without damaging the drive unit.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention. FIG. 2 is a plan view thereof. FIG. 3A is a cross-sectional view of a modified example of the shaft supporting portion. FIG. 11B is a sectional view of still another modification. FIG. 4A is a cross-sectional view of the blow-by gas processing device according to the previous application. The same figure (b) is a sectional view of the shaft support. In the figure, 11 …… Element case, 11a …… Lower wall 11b …… Boss part, 12 …… Motor case 13 …… Spindle, 14 …… Housing 15a …… Upper bearing, 15b …… Lower bearing 16 …… Rotating frame , 18 …… substrate 19 …… stop ring, 20 …… ring sheet

Claims (1)

[Scope of utility model registration request] 1. A blow-by gas intake pipe 17 is provided on one side.
A motor case 12 is integrally provided on the lower side of a cylindrical element case 11 having a return pipe 17b at the center of the upper wall and an oil drain pipe 17c at the lower part of the other side. Upper and lower bearings 15 in the center of
A cylindrical housing 14 in which a and 15b are mounted is provided, and the upper portion of the element case 1 is formed by the bearings 15a and 15b.
The main shaft 13 extending in 1 is supported, and on the upper part of the main shaft 13,
The return pipe 1 is made of a porous annular material and has a center inside
A separating element e having a size such that the upper and lower surfaces and the peripheral side surfaces are in close proximity to the inner surface of the element case is connected to 7b, and a coil c is arranged on the lower outer periphery of the housing 14, while the lower end of the main shaft 13 faces the coil c. A rotating frame 16 provided with a magnet m is attached, and the upper bearing 15a mounted in the housing 14 is used as a sliding bearing that is free to slide on the main shaft, while the lower bearing 15b is a rolling bearing and the lower bearing 15b is a housing. Main shaft 1 below 14
A blow-by gas processing device sandwiched between the stop means provided in No. 3 and the rotary frame 16.