JP2007002738A - Air cleaner installing device for engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance support rigidity of an air cleaner to an engine, in an installation device to the engine of the air cleaner for cleaning and introducing outside air to a general purpose engine. <P>SOLUTION: The air cleaner AC is arranged in parallel on one side of the engine E. A lower part of its cleaner cover body 10 is integrally joined to and supported by the engine E together with a carburetor 4 by a pair of connecting bolts 22 and 23. A reinforcing vertical wall part 37 of the cleaner cover body 10 opposed with clearance to the engine E, is integrally joined to and supported by the engine E by the other one connecting bolt 24. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mounting device for an engine, particularly an air cleaner for cleaning and guiding outside air to a general-purpose engine.

2. Description of the Related Art Conventionally, in a general-purpose engine, an air cleaner for sucking outside air to clean it and then guiding it to the engine is known to be integrally supported by a fastening member such as a bolt on one side of a cylinder portion of the engine. (See Patent Document 1).
Japanese Utility Model Publication No.59-62263

  However, in general engines, outside air cleaned by an air cleaner is mixed with fuel in a carburetor supported by the engine, and then the mixture is supplied to the engine. It is supported by the engine in an overhanging state at a position away from the engine via the carburetor, and there is a problem that it is difficult to secure the support rigidity of the air cleaner, and in order to further improve the performance of the air cleaner, the cleaner chamber volume is increased. If it is increased, the cleaner cover becomes larger and the above problem becomes more prominent.As a result, when the air cleaner is fastened to the engine, the air cleaner may be fastened to the engine after removing the cleaner cover. There is also a problem that the efficiency of fastening work is reduced.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a novel engine air cleaner mounting device capable of solving the above-mentioned problems.

In order to achieve the above object, the invention of claim 1 is an apparatus for mounting an air cleaner for cleaning an intake outside air to guide the engine to the engine,
The air cleaner is arranged in parallel with one side of the engine, and the lower part of the cleaner cover body that constitutes the outer shell of the air cleaner is integrally coupled and supported by a pair of fastening members together with the carburetor on the engine, The reinforcing vertical wall portion of the cleaner cover body facing each other is characterized by being integrally coupled and supported to the engine by another one fastening member.

In order to achieve the above object, the invention of claim 2 is an apparatus for mounting an air cleaner for cleaning an intake outside air and guiding it to the engine.
The air cleaner is arranged in parallel with one side of the engine, and the cleaner cover body forming the outer shell of the air cleaner is cleaned with the upper cover provided with the cleaner element unit for cleaning the introduced outside air. A lower cover body that forms an intake duct that guides outside air to the engine is integrally connected. The lower cover body defines an upper cover body and a lower cover body on an upper surface of the lower cover body, and an upper portion of the lower cover body. Reinforcing partition walls are integrally formed,
The lower cover body is integrally coupled and supported by a pair of fastening members together with a carburetor on the engine, and a reinforcing vertical wall portion near the partition wall on the upper portion of the lower cover body is another one on the engine. It is characterized by being integrally coupled and supported by a fastening member.

  Furthermore, in order to achieve the above object, the invention of claim 3 is the invention according to claim 2, wherein a boss portion having a hollow cylindrical hole extending toward the engine is integrated with the reinforcing vertical wall portion of the lower cover body. Another fastening member that is formed and fixed to the engine passes through the hollow cylindrical hole of the lower cover body and is fixed thereto.

  Furthermore, in order to achieve the object, the invention according to claim 4 is the one according to claim 1, 2, or 3, wherein each of the pair of fastening members and the other fastening member is a connecting bolt, Their central axes are substantially parallel, and any of these connecting bolts can be operated from the outside of the cleaner cover body.

  According to the invention of each claim, it is possible to fasten and support the air cleaner to the engine at three points. In particular, the cleaner cover body is fastened to the engine by using the high rigidity reinforcing vertical wall of the cleaner cover body. As a result, the support rigidity of the air cleaner to the engine can be increased.

  In particular, according to the invention of claim 3, the reinforcing vertical wall portion of the cleaner cover body facing the engine with a gap therebetween can be brought close to the engine and fastened to the engine, and the air cleaner to the engine can be fastened. Support rigidity can be further increased.

  Further, in particular, according to the invention of claim 4, the fastening directions of the three connecting bolts are the same, and they can be fastened from the outside of the cleaner cover body, and the air cleaner is fastened to the engine. Easy to operate.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on examples of the present invention illustrated in the accompanying drawings.

  In this embodiment, the sealing device of the present invention is applied to a general-purpose engine unit. FIG. 1 is a front view of the general-purpose engine unit having the air cleaner structure of the present invention, and FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 2, FIG. 4 is a sectional view taken along line 4-4 in FIG. 3, and FIG. 5 is a sectional view taken along line 5-5 in FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 3, FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 5, FIG. 8 is an exploded perspective view of the air cleaner, and FIG. FIG. 10 is an enlarged plan view of the seal packing taken along line -9, FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. 9, and FIG. 11 is an enlarged view of a virtual line enclosing portion in FIG.

  1 and 2, a general-purpose engine E serving as a power source for various working machines in the general-purpose engine unit is a four-cycle engine, and includes a crankcase 2 that supports a crankshaft 1 that is disposed in a horizontal direction, A cylinder portion 3 projecting obliquely upward from the case 2, a fuel tank T supported by the cylinder portion 3 is disposed directly above the crankcase 2, and a carburetor is disposed on one side of the cylinder portion 3. 4 is attached, and an air cleaner AC connected to the carburetor 4 and an exhaust muffler M connected to the other side of the cylinder part 3 are arranged directly above the cylinder part 3 so that they are arranged on the side of the fuel tank T. Placed in.

  Next, the structure of the air cleaner AC according to the present invention will be described in detail with reference to FIGS.

  The air cleaner AC is arranged in parallel with one side of the cylinder part 3 of the engine E, and is firmly supported at three points by the cylinder part 3 by three fastening members 22, 23, and 24 described below.

  As shown most clearly in FIG. 3, the cleaner cover body 10 that is the outer shell of the air cleaner AC is made of synthetic resin, and is configured by integrally joining the upper cover body 11 and the lower cover body 12. . The upper cover 11 is formed in a cap shape with the lower surface opened. Further, the lower cover body 12 is formed in a sealed shape including an intake duct 13 formed in an elbow shape that is long in the vertical direction and a partition wall 14 that closes the upper surface of the opening. The upper surface of the cover body 12 is detachably fitted and connected.

  As shown in FIGS. 3, 4, and 8, a rectangular tube-shaped ventilation passage 17 is integrally provided in the middle portion of the partition wall 14 so as to project into the upper cover body 11. The inside of the upper cover body 11 and the inside of the lower cover body 12 are communicated with each other. A support bolt 18 extending in the vertical direction is fixed to the upper portion of the intake duct 13 of the lower cover body 12. The support bolt 18 passes through the intake passage 17 and vertically passes through the upper cover body 11, and a screw portion at the upper end of the support bolt 18 passes through a mounting hole 19 provided in the upper wall of the upper cover body and extends outward. The upper cover body 11 is detachably fixed onto the partition wall 14 of the lower cover body 12 by screwing the nut 20 therethrough.

  An exhaust port 16 of the air cleaner AC is opened at the lower end of the lower cover body 12, that is, the lower end of the intake duct 13, and this exhaust port 16 is connected to the upstream end of the vaporizer 4 (see FIG. 6). As will be described later, the air cleaner AC has a lower cover body 12 fixed and supported on the cylinder portion 3 of the engine E with high rigidity.

  Next, this support structure will be described in detail with reference to FIGS.

  The air cleaner AC has its lower cover body 12 supported by the cylinder portion 3 of the engine E at three points. Specifically, as shown in FIGS. 3 and 6, the lower end portion of the lower cover body 12 is attached to the cylinder portion 3 of the engine E at two points together with the carburetor 4 by two connecting bolts 22 and 23 as fastening members. As shown in FIGS. 3, 5, and 7, the upper end portion of the lower cover body 12, i.e., the portion close to the partition wall 14 is connected to the engine by another connecting bolt 24 as a fastening member. The cylinder part 3 of E is supported directly at one point with a gap.

  As shown in FIG. 6, the downstream side of the carburetor 4 is connected to the cylinder head portion 3 </ b> H of the cylinder portion 3 of the engine E via a gasket 25, and a packing 26 is connected to the upstream side of the carburetor 4. A lower end portion of the lower cover body 12 is integrally connected with being sandwiched. The lower end portion of the lower cover 12 is fixed by two connecting bolts 22 and 23 that pass through the bolt holes 27 and 28 provided in the lower cover body 12 and the vaporizer 4 and are screwed to the cylinder head portion 3H of the cylinder portion 3. Is done. A metal sleeve 29 is fitted in the bolt hole 27 of the lower cover 12 so that the rigid resin lower cover body 12 is not deformed even when the connecting bolts 22 and 23 are tightened. The intake duct 13 formed in the lower cover body 12 of the air cleaner AC is communicated with the intake port Ep of the engine E through the intake passage 30 of the carburetor 4, and the clean intake air in the air cleaner AC is normally supplied to the carburetor. After being mixed with fuel at 4, it is guided to the intake port Ep.

  In FIG. 6, reference numerals 32 and 33 denote a choke valve and a throttle valve that can be opened and closed in the intake passage 30 of the carburetor 4.

  As shown in FIGS. 3 and 5, one side of the lower cover body 12 of the air cleaner AC faces the side surface of the cylinder portion 3 of the engine E with a gap, and faces the partition wall 14 of the lower cover body 12. The near upper portion of the vertical wall portion 37 is reinforced by the partition wall 14 and a cylindrical boss portion 38 is integrally formed to have high rigidity. The boss portion 18 is integrally formed with a long bottomed hollow cylindrical hole 39 extending inward of the lower cover body 12, that is, toward the cylinder portion 3 of the engine E. Bolt holes 40 are provided through the back wall. A bolt screw hole 41 is provided on the wall surface of the cylinder head portion 3H of the cylinder portion 3 facing the bolt hole 40, and the bolt hole 40 and the bolt screw hole 41 are on the same axis as shown in FIG. . A connecting bolt (stud bolt) 24 as a fastening member is screwed into the bolt screw hole 41. The connecting bolt 24 passes through the screw hole 40 of the lower cover body 12, and then the screw portion protrudes into the hollow cylindrical hole 39, and the nut 42 is screwed to the screw portion, whereby the vertical length of the lower cover body 12 is increased. The wall portion 37 is fixed to the cylinder head portion 3 </ b> H of the cylinder portion 3 with the one connecting bolt 24. Accordingly, the upper portion of the lower cover body 12 has a highly rigid vertical wall portion 37 (close to the partition wall 14 and reinforced by the boss portion 38), and the engine is supported by the single connecting bolt 24 as a fastening member. It is firmly fixed to the cylinder part 3 of E. Further, the nut 42 is in the hollow cylindrical hole 39 and does not fall off due to interference with other objects.

  As shown in FIG. 5, the center axis lines 22l and 23l of the two connection bolts 22 and 23 and the center axis line 24l of the stud bolt 24 are substantially parallel to each other and have the same fastening direction. Since these three connecting bolts 22, 23, 24 can all be tightened / relaxed from the outside of the air cleaner AC, the operation of the air cleaner AC to the cylinder portion 3 of the engine E is easy.

  As described above, the air cleaner AC is supported and fixed at three points to the cylinder portion 3 of the engine E by the lower cover body 12 by the three fastening members, that is, the three connecting bolts 22, 23, 24. The support rigidity can be greatly increased. Further, the boss portion 38 is provided with a deep hollow cylindrical hole 39 toward the cylinder portion 3, and the tightening distance by the connecting bolt 24 is shortened. Therefore, the air cleaner AC is connected to the cylinder which is the mounting portion on the engine side. It can approach the part 3 and can be fixedly supported there, and the support rigidity can be further increased.

  As shown in FIGS. 3 and 8, a cleaner element unit Ue described later is detachably accommodated in the upper cover body 11 of the air cleaner AC.

  A suction port 50 for taking in outside air is opened on the partition wall 14 of the lower cover body 12, that is, on one side of the upper wall of the lower cover body 12 (right side in FIGS. 3 and 4). As shown in FIG. 4, the suction port 50 is formed as a long hole that is long in a direction orthogonal to a center line cc passing through the center 50 c and the center 12 c of the lower cover body 12, and the center thereof. It has the expansion part 50a which spreads toward the center 12c side of the lower cover body 12 with respect to 50c, and is formed in a large area as a whole. As shown in FIG. 3, a square cylinder-shaped intake cylinder 51 that extends into the upper cover body 11 is integrally connected to the suction port 50. The intake cylinder 51 is formed in a chimney shape that is gradually throttled from the inlet on the inlet 50 side toward the outlet at the upper end.

  A shielding wall 53 is integrally suspended along the outer opening edge of the suction port 50 on the side away from the cleaner element unit Ue. As shown in FIG. 4, the shielding wall 53 extends in a direction away from the suction port 50 so as to cover the suction port 50, and is then bent and curved so as to cover both longitudinal ends of the suction port 50. The cover body 11 is connected to the lower part of the inner surface. Therefore, the shielding wall 53 covers the substantially half of the suction port 50 on the side away from the cleaner element unit Ue. In addition, the lower end of the skirt wall 11 a in the vicinity of the suction port 50 of the upper cover body 11 extends downward from the suction port 50, and the extended portion faces the shielding wall 53 and is parallel to the shielding wall 53. The lower end thereof is set at substantially the same level as the lower end of the shielding wall 53. And as shown in FIG. 3, the said shielding wall 53 and the skirt wall 11a of the upper cover body 11 form the double wall which mutually faces under the outer opening edge of the suction inlet 50, and between these A gap 54 opened downward is formed.

By the way, the general-purpose engine working machine is generally used outdoors, and when using in rainy weather, naturally, raindrops that fall on the upper cover 11 of the air cleaner AC are allowed to fall on the skirt wall 11a from the upper surface of the upper cover body 11. It is considered that it reaches the lower edge of the air and is sucked into the air cleaner AC through the suction port 50. This embodiment is provided with a structure that actively prevents raindrops from entering the air cleaner AC. In other words,
(1) The lower end of the skirt wall 11a close to the suction port 50 extends downward from the level of the suction port 50.
It is possible to prevent the raindrops from being drawn to the suction port 50 due to the intake negative pressure.

(2) By forming a double wall with the shielding wall 53 and the skirt wall 11a of the upper cover body 11 that covers the suction port 50 and extends below the suction port 50,
According to the above (1), the raindrops attracted to the suction port 50 bypass the lower edge of the skirt wall 11a and flow into the gap 54. Here, the raindrops collide with the shielding wall 53 and fall. Accordingly, it is possible to more reliably prevent raindrops from being sucked into the suction port 50.

Further, (3) the suction port 50 is provided with a widened portion 5a that expands toward the center 11c side of the upper cover body 11 with respect to the center 50c, and the intake cylinder 51 connected to the suction port 50 includes: By gradually squeezing from the entrance to the exit,
The intake negative pressure becomes weak in the vicinity of the intake port 50, and the flow velocity of the intake air there is slowed down, and the effect of preventing the raindrops from being absorbed into the air cleaner AC by the above (1) and (2) is assisted.

  A cleaner element unit Ue is accommodated and supported in the upper cover body 11 of the cleaner cover body 10. As shown in FIGS. 3 and 8, the cleaner element unit Ue is formed in an oval cylindrical shape as a whole, and is formed in an oval cylindrical shape in which a paper cleaner 62 and a urethane cleaner 61 are stacked to open the upper and lower surfaces. And an upper plate 63 and a lower plate 64 made of a metal plate, which are attached to the open upper and lower surfaces of the cleaner element 60 so as to close them. A mounting hole 66 into which a rubber bush 65 is fitted is provided at the center of the upper plate 63, and a rectangular tube-shaped ventilation passage 17 protruding from the partition wall 14 is provided at the center of the lower plate 64. A fitting hole 67 that is detachably fitted is opened.

  As shown in FIG. 3, the cleaner element unit Ue is seated on the partition wall 14 with the seal packing 68 interposed therebetween, with the fitting hole 67 of the lower plate 64 fitted into the outer peripheral surface of the ventilation passage 17. The support bolt 18 passing through the ventilation passage 17 and vertically passing through the cleaner element has a threaded portion at the upper end protruding through the rubber bush 65 of the mounting hole 66 and projecting outside, and a nut 69 is screwed into the projecting end. By tightening, the cleaner element unit Ue is detachably fixedly supported on the partition wall 14 of the lower cover body 12 via the seal packing 68.

  Thus, the cleaner element unit Ue divides the inside of the upper cover body 11 into an unclean chamber Cd on the outside and a clean chamber Cc on the inside. According to the operation of the engine E, outside air is sucked in. After entering the unclean chamber Cd through the port 50 and filtered through the cleaner element 60, the clean chamber Cc is entered, and is led from the ventilation passage 17 to the vaporizer 4 through the intake duct 13.

  Thus, a seal packing 68 made of rubber packing is sandwiched between the upper surface of the partition wall 14 and the lower surface of the lower plate 64 of the cleaner element unit Ue. The seal packing 68 hermetically seals between the unclean chamber Cd and the clean chamber Cc to prevent unclean outside air from being directly sucked into the clean chamber Cc. As shown in FIGS. 9, 10, and 11, the seal packing 68 is formed in a square endless shape, and is fitted to the outer peripheral surface of the root portion of the rectangular tube-like intake passage 17. At the intermediate portion in the width direction of the upper seal surface 71 and the lower seal surface 73 of the seal packing 68, lower lip pieces 72 and 74 are integrally projected on the upper side of the triangular shape. The cleaner element unit Ue is in close contact with the lower surface of the lower plate 64, and the lower lip piece 74 is in close contact with the upper surface of the partition wall 14. In addition, a plurality of retaining protrusions 75 as retaining members are provided integrally and projecting inward on the inner peripheral surface of the seal packing 68 at intervals in the circumferential direction. The base portion of the outer peripheral surface of the intake passage 17 is closely engaged by the frictional force therebetween, and the cleaner element unit Ue is connected to the intake passage in order to perform maintenance such as replacement or cleaning of the cleaner element unit Ue. When the seal packing 68 is removed from the air inlet 17, the seal packing 68 remains attached to the cleaner element unit Ue so that it does not slip out of the intake passage 17. Therefore, the assembly of the seal packing 68 to the intake cylinder 17 is not forgotten or lost.

  As mentioned above, although one Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention.

  For example, in the above-described embodiment, the case where the connecting bolt is used as the fastening member has been described. However, another fastening member having the same effect may be used instead of the connecting bolt.

Front view of a general-purpose engine unit equipped with an air cleaner mounting device for an engine of the present invention 2 arrow view of FIG. Enlarged cross-sectional view along line 3-3 in FIG. Sectional view along line 4-4 in FIG. Sectional drawing which follows the 5-5 line of FIG. Sectional drawing which follows the 6-6 line of FIG. Sectional view along line 7-7 in FIG. Exploded perspective view of air cleaner Enlarged plan view of seal 1 packing along line 9-9 in FIG. Sectional drawing which follows the 10-10 line of FIG. Enlarged view of the imaginary line enclosure in FIG.

Explanation of symbols

4 Vaporizer 10 Cleaner cover body 11 Upper cover body 12 Lower cover body 13 Intake duct 14 Partition 22 Fastening member (connection bolt)
22l Center axis 23 Fastening member (connection bolt)
23l Center axis 24 Fastening member (connection bolt)
24l Center axis 37 Vertical wall 38 Boss 39 Hollow cylindrical hole E Engine Ue Cleaner element unit

Claims (4)

An apparatus for mounting an air cleaner for purifying the intake outside air to guide the engine (E) to the engine,
The air cleaner (AC) is arranged in parallel with one side of the engine (E), and the lower part of the cleaner cover body (10) constituting the outer shell is attached to the engine (E) together with the carburetor (4). The reinforcing vertical wall portion (37) of the cleaner cover body (10) which is integrally coupled and supported by the pair of fastening members (22, 23) and faces the engine (E) with a gap therebetween is another fastening. An air cleaner mounting device for an engine, which is integrally coupled and supported to the engine (E) by a member (24). An apparatus for mounting an air cleaner for purifying the intake outside air to guide the engine (E) to the engine,
The air cleaner (AC) is arranged in parallel with one side of the engine (E), and the cleaner cover body (10) that forms the outer shell of the air cleaner (AC) is a cleaner element that cleans the introduced outside air. An upper cover (11) provided with the unit (Ue) and a lower cover body (12) formed with an intake duct (13) for guiding the cleaned outside air to the engine (E) are integrally connected, The lower cover body (12) is integrally formed with a partition wall (14) for partitioning the upper cover body (11) and the lower cover body (12) and reinforcing the upper portion of the lower cover body (12) on the upper surface thereof. And
A lower portion of the lower cover body (12) is integrally coupled to the engine (E) by a pair of fastening members (22, 23) together with the carburetor (4), and an upper portion of the lower cover body (12). An engine air cleaner mounting characterized in that the reinforcing vertical wall portion (37) close to the partition wall (14) is integrally coupled and supported to the engine (E) by another fastening member (24). apparatus.   A boss portion (38) having a hollow cylindrical hole (39) extending toward the engine (E) is integrally formed on the reinforcing vertical wall portion (37) of the lower cover body (12). The engine according to claim 2, wherein the other fastening member (24) to be fixed passes through the hollow cylindrical hole (39) of the lower cover body (12) and is fixed thereto. Air cleaner mounting device.   Both of the pair of fastening members (22, 23) and the other one fastening member (24) are connection bolts, and their central axes (221, 23l, 24l) are substantially parallel and connected to each other. 4. The engine air cleaner mounting device according to claim 1, wherein any of the bolts (22, 23, 24) can be operated from the outside of the cleaner cover body (10).

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