JPS6113738Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of an oil bath type air cleaner used in general-purpose engines and the like.

[Conventional technology]

The conventional air cleaner as described above has an oil reservoir at the bottom, and a filter element is arranged above the oil reservoir, as seen in, for example, Japanese Utility Model Application Publication No. 47-38309. After the sucked air is exposed to oil in the oil reservoir, it is passed through a filter element in the axial direction to purify the air and then sucked into a vaporizer installed outside the air cleaner.

[Problem that the invention attempts to solve]

However, in such air cleaners, the filter element has a small filtration area, which can cause engine starting problems, and if the air cleaner is tilted, the oil in the oil reservoir tends to spill and flow into the carburetor, and the air cleaner The height of the air suction port is relatively low, and air containing a lot of dust is often sucked in. In particular, since the suction air is directly applied to the oil surface of the oil reservoir, the air is sucked in together with the suction air. Large debris such as dried grass and straw can enter the oil, and the oil can be absorbed by the debris, leading to premature oil deterioration or abnormal reduction.
Moreover, there was a drawback that changing the oil in the oil pan was troublesome.

The present invention eliminates the above-mentioned drawbacks of the conventional filter, increases the filtration area of the filter element, prevents large-sized dirt from entering the oil reservoir, and sufficiently removes dust through an oil bath. However, there is little oil deterioration, and even if the air cleaner is tilted, it is difficult for oil to flow into the carburetor.Furthermore, the air suction port is located high so that outside air with relatively little dust can be sucked in, and oil changes are easy. The purpose of this invention is to provide an oil bath type air cleaner that can perform

[Means for solving problems]

In order to achieve this objective, the oil bath type air cleaner of the present invention has an element case with a built-in filter element fixed under the oil pan in a removable manner, and an annular oil reservoir is formed in the oil pan. A cap and a duct component are removably tightened onto the oil pan, and the cylindrical space formed between the oil pan and the duct component and the top of the oil reservoir are drawn from the air suction port provided at the upper end of the air cleaner. Then, an air passage is formed that passes through the filter element from the inner circumferential side to the outer circumferential side and opens to the outer circumferential side of the element case.In addition, a suction air direction regulating plate that also serves as a large dust trap is installed in a radial direction, integrally with one of the oil pan and the duct component. A large number of these suction air direction regulating plates are brought into contact with the other of the oil pan and the duct component,
A cylindrical space is partitioned above the oil reservoir, and large debris is collected in the cylindrical space above the suction air direction regulating plate.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to the drawings.

In FIG. 1 showing an embodiment of the present invention, reference numeral 1 denotes an oil pan made of a transparent synthetic resin molding. The inner cylinder 3 has a part that projects downward, and the bottom 4 integrally connects the lower end of the outer cylinder 2 and the inner cylinder 3.
An oil reservoir portion 5 is formed in the lower part. The oil reservoir 5 is partitioned by a number of partition plates 6 to form an oil chamber 5a having a sector-shaped horizontal cross section, and has an uneven bottom formed by convex portions 4a and the like.
An oil-shielding cylinder 7 having a taper extending toward the outer circumference is fitted and fixed to the upper end of the inner cylinder 3. An element case 8 is disposed below the oil pan 1, and the element case 8 is formed into a substantially bottomed cylindrical shape. A cylindrical filter element 10 is sandwiched between the inner and outer portions, and the filter element 10 is disposed on the outer circumferential side of the inner cylinder 3 . An air outlet pipe 12 is connected to the peripheral wall 11 of the element case 8, and a flange portion 12d provided at the tip of the outlet pipe 12 is configured to be connected to a carburetor (not shown).
A hole 9b is provided in a recess 9a formed in the center of the bottom 9 of the element case 8, and a drain plug 13 is removably fitted into the hole 9b. Latches 14 are attached to the outer peripheral surface of the peripheral wall 11 of the element case 8 at a plurality of locations in the circumferential direction. are engaged, and by tightening the latch 14, the element case 8 and the oil pan 1 are releasably fastened. A communication port 3 is provided at the upper end of the inner cylinder 3 of the oil pan 1 to communicate the inside and outside of the oil pan 1.
a are formed at multiple locations in the circumferential direction, and communication ports 3a
A top plate 18 is provided integrally with the upper end of the upper inner cylinder 3,
An upper wall 20 of the duct component 19, which will be described later, is attached to a protrusion 18a with a square horizontal cross section provided on the top plate 18.
The square hole 20d provided in the top wall 20 is fitted into the center part of the top wall 20, and the center part of the top wall 20 is supported on the top plate 18. The top wall 22 of a cap 21, which will be described later, is supported on the top wall 20, and the tightening bolt 23 is inserted upward. From said upper walls 20, 22
The cap 21 and the duct component 19 are screwed into the protrusion 18a of the oil pan 1 through the cap 1, and the cap 21 and the duct component 19 are simultaneously tightened and removably fixed to the oil pan 1. The duct component 19 is formed into a substantially inverted bowl shape, and its peripheral wall 24 is inserted into the oil pan 1 and between the outer cylinders 3 and 2 with a gap therebetween. A cylindrical space portion 25 is formed in the cylindrical space portion 25 . As shown in FIG. 2, integrally with the peripheral wall 24 of the duct component 19, a large number of large dust trapping and suction air direction regulating plates 26 are provided radially projecting at equal angular intervals. The tip of the regulating plate 26 is brought into contact with the outer cylinder 2 to partition the lower part of the cylindrical space 25 above the oil reservoir 5. The cap 21 is formed into a substantially inverted dish shape, and an outer circumferential wall 27 hanging down from the upper wall 22 is located on the outer circumferential side of the outer cylinder 2 of the oil pan 1.
An air suction port 28 is formed between the outer cylinder 2 and the outer cylinder 2 over the entire circumference thereof. The duct component 19
Claw pieces 29 are formed on the outer circumferential portion of the upper wall 20 at a plurality of locations in the circumferential direction, and the claw pieces 29 protrude above the outer cylinder 2. In FIG. 1, reference numeral 30 is a seal ring, 31 is an element retainer, and 32 is oil in the oil reservoir 5.

Next, the operation of the air cleaner configured as above will be explained. When the engine is running, the outer peripheral wall 27 of the cap 21 and the outer cylinder 2 of the oil pan 1
Outside air is sucked in from the air suction port 28 formed around the entire circumference between the cap 21 and the outer wall 27 of the cap 21 and the outer cylinder 2 of the oil pan 1. 2, enters the cylindrical space 25 formed between the outer tube 2 and the peripheral wall 24 of the duct component 19 from below the upper wall 22 of the cap 21, and descends through this space 25. It passes between the suction air direction regulating plates 26 for capturing large debris. At this time, when this air cleaner is attached to the engine of an agricultural machine, if large-sized garbage such as dry grass or straw is sucked in with the intake air, these large-sized garbage are captured by the suction air direction regulating plate 26, and these large-sized garbage are It is stored in the upper cylindrical space 25. Therefore, large-sized debris does not enter the oil 32 in the oil reservoir 5. The air passing between the suction air direction regulating plates 26 is blown onto the oil surface of the oil reservoir 5, and dust particles in the air are attached to the oil 32 and removed. In this case, the direction of the air is regulated from above by the suction air direction regulating plate 26, and the oil reservoir section 5 is partitioned into each oil chamber 5a by the partition plate 6, making it difficult for oil to move. Part 5
Since the convex portion 4a and the like form unevenness on the bottom of the oil 32, there is little convection of the oil 32 and the oil 32 is prevented from being pushed up against the wall surface of the partition plate 6 and the oil reservoir 5, so that less oil 32 is carried away. 3 oil on top
2 deteriorates uniformly, and dust is effectively adsorbed and removed. The air that has collided with the oil 32 bypasses the lower end of the peripheral wall 24 of the duct component 19 and rises between this peripheral wall 24 and the inner cylinder 3 of the oil pan 1.
During this time, the oil particles contained in the air hit the oil shield cylinder 7 fixed to the inner cylinder 3, thereby reducing the amount of oil carried into the cylinder. Air enters the inner cylinder 3 through the communication port 3a provided at the upper end of the inner cylinder 3, descends, and flows through the inner cylinder 3.
It passes between the lower edge of the filter element 10 and the bottom 9 of the element case 8, and passes through the filter element 10 from the inside to the outside, and at this time, dust remaining in the air is captured and removed to purify the air. The purified air is supplied to the vaporizer via the air outlet pipe 12.

In the air cleaner of the above-described embodiment, the oil pan 1 is provided on the air cleaner 8 that incorporates the filter element 10, so the air suction port and the latch 14 are placed higher than in a conventional air cleaner in which the oil reservoir is located at the lower end. It can be installed in any position.

Further, the air cleaner of this embodiment can be directly connected to the carburetor, and a large elbow or the like for connection is not required, so that the air cleaner and the engine using the air cleaner can be made compact as a whole. Further, since the oil reservoir portion 5 is located at a relatively upper portion and the oil pan 1 is transparent, inspection and replacement of the oil can be easily performed. Furthermore, since the latch 14 is located high, these operations and the operation of attaching and detaching the air cleaner 8 and the oil pan 1 are easy, and the duct component 19 and the cap 21 are secured to the top plate 18 of the oil pan 1 with the tightening bolts 23. Since the oil pan 1 is tightened, it is easy to attach and detach the oil pan 1, the duct component 19, and the cap 21.
0 can be easily replaced. Note that the duct component 19 can be easily removed by holding the claw piece 29. Furthermore, even if the air cleaner 8 is attached to the engine, the filter element 10 can be cleaned by removing the drain plug 13.

3 and 4 show other embodiments of the present invention,
In this embodiment, a flat air suction port 35 is formed in a part of the outer circumferential wall 34 of the cap 33 in the tangential direction of the inner circumferential surface of the cap 33, and most of the other part of the outer circumferential wall 34 is formed on the outer cylinder 2 of the oil pan 1. In this embodiment, the cap 33 is rotated around the axis of the tightening bolt 23 by loosening the tightening bolt 23 that fastens the cap 33 and the duct component 19 to the oil pan 1. As a result, the position of the air suction port 35 may be changed to a direction where the amount of dust suction is small.
It can be changed in the circumferential direction as desired, and the sucked air can be swirled. The configuration and operation of this embodiment other than those described above are the same as those shown in FIGS. 1 and 2, so the same reference numerals are given to the parts corresponding to those in FIG. 1 and the description will be given in FIG. Omitted. In this embodiment, it is preferable to position the cap 33 by detachably engaging the claw piece 29 provided on the duct component 19 with the cap 33.

In the present invention, the suction air direction regulating plate is
It may be provided protruding from the outer cylinder of the oil pan and brought into contact with the peripheral wall of the duct component, or the suction air direction regulating plate 26 may be tilted as shown by the solid line in FIG. 2 to create a swirling flow in the suction air. Alternatively, a cyclone type separator may be constructed.

[Effect of idea]

As explained above, the oil bath type air cleaner according to the present invention has an oil pan provided on the element case, a cap and duct components are removably tightened and fixed on the oil pan, and an air suction port is provided at the upper end of the air cleaner. Because of this, the outside air suction position is higher than that of conventional ones, reducing the amount of dust sucked in. Also, the cylindrical space above the oil reservoir has a large number of large dust traps and suctions. A large number of air direction regulating plates are provided in a radial manner, and these are used to capture large debris such as dry grass and straw that are sucked in with the air, and the large debris is collected on the suction air direction regulating plates to prevent it from entering the oil reservoir. This prevents the oil from being absorbed by large debris and causing deterioration or reduction, and the suction air direction regulating plate prevents the air from removing the oil from the oil reservoir.
By restricting convection to a smaller direction, oil deterioration and reduction can be prevented, so the oil's dust removal ability can be effectively maintained over a long period of time. Because of this, the filtration area is large and the filtration capacity is large.Moreover, the oil reservoir is located far away from the carburetor, and the cylinder on the inner circumference side can be made sufficiently high, so the air cleaner can be tilted along with the engine. Even if the oil pan is located above the filter case, there is no risk of oil flowing into the carburetor from the oil reservoir, preventing deterioration of engine startability due to oil inflow, and because the oil pan is located above the filter case, disassembly is easy. This has the effect of making oil changes easier.

[Brief explanation of the drawing]

FIG. 1 is a half-cut front view showing an embodiment of the present invention;
FIG. 2 is a cross-sectional plan view of the cylindrical space, FIG. 3 is a half-cut front view showing another embodiment of the present invention, and FIG. 4 is a plan view thereof. 1...Oil pan, 2...Outer cylinder, 3...Inner cylinder,
3a...Communication port, 4...Bottom, 4a...Protrusion, 5...
...Oil reservoir section, 5a...Oil chamber, 6...Partition plate,
7...Oil shield cylinder, 8...Element case, 9...
Bottom, 9a... recess, 9b... hole, 10... filter element, 11... peripheral wall, 12... air outlet pipe, 12a... flange, 13... drain plug, 14... latch, 15... upper end flange, 1
6...Lower end flange, 17...Reinforcement ring, 18
...Top plate, 18a...Protrusion, 19...Duct component, 20...Top wall, 20a...Square hole, 21...
... Cap, 22 ... Upper wall, 23 ... Tightening bolt, 24 ... Peripheral wall, 25 ... Cylindrical space, 26 ...
...Suction air direction regulating plate that also serves as large garbage capture, 27...
...Outer peripheral wall, 28...Air suction port, 29...Claw piece,
30... Seal ring, 31... Element retainer, 32... Oil, 33... Cap, 34
...Outer wall, 35...Air suction port.

Claims (1)

[Scope of utility model registration request] An annular oil reservoir is formed in the oil pan, in which an element case with a built-in filter element is tightened and fixed in a removable manner below the oil pan.
A cap and a duct component are removably tightened and fixed on the oil pan, and an air suction port provided at the upper end of the air cleaner is connected to a cylindrical space formed between the oil pan and the duct component and above the oil reservoir. It forms an air passage that passes through the filter element from the inner circumferential side to the outer circumferential side and opens to the outer circumferential side of the element case, and is also integrated with the oil pan and one of the duct components to trap large debris and regulate the direction of suction air. A large number of plates protrude radially, and these suction air direction regulating plates are brought into contact with the other of the oil pan and the duct component to partition a cylindrical space above the oil reservoir. An oil bath type air cleaner characterized in that it is configured to collect large debris above a suction air direction regulating plate.