General engine unit
By placing the fuel tank and air filter box side by side above the engine, configuring a collection box, and using fins to guide air, the problems of fuel leakage and high cost in general-purpose engine sets are solved, achieving the effects of efficient air intake and low-cost storage of evaporated fuel.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HONDA MOTOR CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-07-03
AI Technical Summary
In existing general-purpose engine sets, using adsorbent tanks to store evaporated fuel is costly, while using ordinary containers instead of tanks is difficult to effectively prevent fuel leakage.
A fuel tank and an air filter box are arranged side by side above the engine. A collection box is configured to store evaporated fuel and is connected through a fuel pipe. The collection box is set along the edge of the air intake of the air filter box. It uses fins to guide air, enhances intake efficiency, and maintains negative pressure inside the collection box during operation.
It effectively suppresses fuel pipe cooling, improves intake efficiency, prevents evaporative fuel leakage, reduces costs, and maintains the structural strength and functionality of the collection box.
Smart Images
Figure CN224452936U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a general-purpose engine set, and more particularly to a general-purpose engine set with a collection box that temporarily stores evaporated fuel generated inside the fuel tank. Background Technology
[0002] Previously, a general-purpose engine set was known, which consisted of an engine, a fuel tank, and an air filter housing as a single unit, and was used as a power source for working machinery, etc.
[0003] Patent Document 1 discloses a universal engine assembly having a tank for temporarily storing condensed vaporized fuel, so as to deliver the vaporized fuel generated inside the fuel tank to the engine via an air filter box.
[0004] Prior art patent document 1: Japanese Patent Application Publication No. 2008-208789 Utility Model Content
[0005] [The problem that the utility model aims to solve]
[0006] Here, canisters filled with adsorbent to absorb evaporated fuel have the advantage that fuel is less likely to leak to the outside even if the general-purpose engine set is tilted significantly; however, they are costly. On the other hand, in order to reduce costs, various efforts are needed to ensure that collection boxes, which are ordinary containers, can be used instead of canisters to prevent fuel leakage and to make them function well.
[0007] The purpose of this invention is to provide a universal engine set that can solve the problems of the prior art and enable the collection box for temporary fuel storage to function well.
[0008] [Technical means to solve the problem]
[0009] To achieve the aforementioned objective, the general-purpose engine assembly (1) of this utility model is constructed by arranging a fuel tank (2) and an air filter box (10) side by side in the horizontal direction above the engine (E). Its first feature is that it includes: a collection box (50) disposed near the aforementioned air filter box (10) and storing the evaporated fuel generated inside the aforementioned fuel tank (2); and a fuel pipe (6) for delivering the aforementioned evaporated fuel from the aforementioned fuel tank (2) to the aforementioned collection box (50); and the aforementioned collection box (50) is disposed above the aforementioned engine (E) and between the aforementioned fuel tank (2) and the aforementioned air filter box (10).
[0010] Furthermore, the second feature is that an air intake (18) is provided at the lower part of the aforementioned air filter box (10), and the aforementioned collection box (50) is arranged along the edge (18b) of the aforementioned air intake (18).
[0011] Furthermore, the third feature is that a connecting portion (54) for connecting one end of the aforementioned fuel pipe (6) is provided on the aforementioned collection box (50), and a rib (52) extending in a direction perpendicular to the intake direction line (18a) of the aforementioned intake port (18) is provided near the aforementioned connecting portion (54), and the aforementioned intake direction line (18a) is arranged within the width of the aforementioned rib (52) when viewed from the connection direction of the aforementioned fuel pipe (6).
[0012] Furthermore, the fourth feature is that, when viewed from a direction perpendicular to the aforementioned air intake direction line (18a), at least a portion of the aforementioned air intake port (18) is disposed within the width of the aforementioned rib (52), and the aforementioned rib (52) overlaps with the aforementioned air intake port (18) on the aforementioned air intake direction line (18a).
[0013] Furthermore, the fifth feature is that the aforementioned collection box (50) is configured such that the wall portion (55) disposed along the aforementioned edge (18b) is thicker than the other wall portions.
[0014] Furthermore, the sixth feature is that the aforementioned collection box (50) is directly installed on the bottom wall (17) of the aforementioned air filter box (10).
[0015] Furthermore, the seventh feature is that the interior of the aforementioned collection box (50) is under negative pressure during the operation of the aforementioned engine (E).
[0016] (Effects of the utility model)
[0017] Based on the first feature, the length of the fuel pipe can be kept short, and the fuel pipe can be positioned above the engine. Thus, the heat from the engine is used to heat the fuel pipe, thereby preventing the evaporating fuel inside the fuel pipe from cooling and liquefying.
[0018] According to the second feature, by arranging a collection box along the edge of the air intake of the air filter box, the collection box itself can be used as a guide to efficiently guide air to the air intake.
[0019] According to the third feature, the ribs can protect the connection part and can guide the air in contact with the ribs to the air inlet to improve the air intake efficiency.
[0020] Based on the fourth feature, the effect of guiding air to the intake port using ribs can be improved.
[0021] According to the fifth feature, the cooling of the air directed to the intake port by the evaporated fuel in the collection box can be prevented. In addition, by increasing the wall thickness only in the part that is in contact with the air directed to the intake port, the support strength of the connection can be improved while suppressing the increase in the weight of the collection box.
[0022] According to the sixth feature, the effect of guiding air to the intake port using the collection box can be improved.
[0023] According to the seventh feature, it can prevent the evaporated fuel discharged from the collection box from flowing to the outside, and effectively send the evaporated fuel inside the collection box to the air filter box. Attached Figure Description
[0024] Figure 1 This is a front view of a general-purpose engine assembly according to one embodiment of the present invention.
[0025] Figure 2 This is a rear view of the general-purpose engine assembly.
[0026] Figure 3 This is a top view of a general-purpose engine assembly.
[0027] Figure 4 This is a left-side view of the general-purpose engine assembly.
[0028] Figure 5 From Figure 1 A front view of the general-purpose engine assembly after the air filter box cover has been removed.
[0029] Figure 6 yes Figure 1 A magnified view of a portion of the image.
[0030] Figure 7 yes Figure 1 Sectional view along line VII-VII.
[0031] Figure 8 It is a three-dimensional view showing the shape of the ribs.
[0032] Figure 9 yes Figure 7 IX-IX line cross-section.
[0033] Figure 10 This is a perspective view showing the internal state of the collection box when the general-purpose engine set causes the recoil starter to tilt downwards.
[0034] Figure 11 It is a perspective view showing the internal state of the collection box when the cylinder head of the general engine unit is tilted downwards.
[0035] Figure 12 It is a perspective view showing the internal state of the collection box when the output shaft of the general-purpose engine is tilted downwards.
[0036] Figure 13 This is a perspective view showing the internal state of the collection box when the control unit of the general-purpose engine pack is tilted downwards.
[0037] Figure Labels
[0038] 1 General-purpose engine set
[0039] 2 fuel tanks
[0040] 6. Feed pipe (fuel pipe)
[0041] 10 Air Filter Box
[0042] 17. Bottom wall of the air filter box
[0043] 18 air intakes
[0044] Inhalation direction line of 18a intake port
[0045] 18b intake edge
[0046] 50 collection boxes
[0047] 52 ribs
[0048] 54 Connecting parts
[0049] 55 wall section
[0050] E engine
[0051] F fuel Detailed Implementation
[0052] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Figure 1 This is a front view of a general-purpose engine pack 1 according to one embodiment of the present invention. Furthermore, Figure 2 This is a rear view of General Motors Unit 1. Figure 3 This is a top view of General Motors Unit 1. Figure 4 This is a left-side view of General Motors Unit 1.
[0053] The general-purpose engine set 1, used as a power source for working machinery, is configured such that a fuel tank 2, an air filter box 10, and a muffler 20 are integrally mounted on top of an engine E, which is a four-stroke single-cylinder internal combustion engine. A recoil starter 40 for starting the engine E is located at the front of the crankcase 41 of the engine E. The recoil starter 40 houses a pulley (not shown) around which a rope member connected to a handle 42 is wound. The user rotates the crankshaft (not shown) connected to the pulley by pulling the handle 42 upwards.
[0054] On the right side of the crankcase 41, a control unit 30 equipped with operating switches 31 and 32 is provided. On the left side of the crankcase 41, a cylinder 43 is fixed, which reciprocates to house the piston of the engine E. On the upper part of the cylinder 43, a cylinder head 44 housing the intake and exhaust mechanisms is fixed. An exhaust pipe 21, connected to the lower part of the muffler 20, is connected to the rear part of the cylinder head 44. An intake pipe 12, connected to the lower part of the air filter box 10, is connected to the front part of the cylinder head 44. At the rear of the crankcase 41, an output shaft 45, which rotates synchronously with the crankshaft, protrudes.
[0055] Below the filler cap 3 of the fuel tank 2, a guide 4 is provided to guide fuel to the fuel pump. A feed pipe 5 is connected to the guide 4 to guide the evaporated fuel generated inside the fuel tank 2 to the bottom of the fuel tank 2. The front end of the feed pipe 5 is connected to a feed pipe 6, which serves as a fuel pipe. At the front end of the feed pipe 6, a collection box 50, serving as a container for storing condensed evaporated fuel, is connected. The collection box 50 is installed at the bottom of the air filter housing 10, and a discharge hose 51 is connected to the lower part of the collection box 50.
[0056] Figure 5 From Figure 1 A front view of the general-purpose engine pack 1 after the cover component 14 of the air filter box 10 has been removed. Furthermore, Figure 6 yes Figure 1 A partially enlarged view. The same symbols as described above denote the same or equivalent parts. The air filter element 13 is disposed on the upper part of the bottom wall 17 of the air filter housing 10. An air intake 18 with an air intake direction line 18a oriented vertically is provided on the bottom wall 17. A cylindrical air intake guide 19 extending upwards is connected to the edge of the air intake 18.
[0057] The evaporated fuel generated inside the fuel tank 2 is guided to the collection tank 50 via the feed pipe 5 and the feed tube 6. In the general-purpose engine set 1 of this embodiment, the collection tank 50, which stores the fuel F generated by the condensation of the evaporated fuel, is located above the engine E and between the fuel tank 2 and the air filter box 10. Therefore, the length of the feed tube 6 can be kept short, and the feed tube 6 can be positioned above the engine E. As a result, the heat from the engine E is used to heat the feed tube 6, thereby preventing the evaporated fuel inside the feed tube 6 from cooling and liquefying.
[0058] Figure 7 yes Figure 1 The cross-sectional view along line VII-VII. Furthermore... Figure 8This is a perspective view showing the shape of the rib 52. The same symbols as described above denote the same or equivalent parts. The collection box 50 has a shape where its front-to-back dimension is larger than its left-to-right dimension. On the right side of the collection box 50, a cylindrical connecting part 54 for connecting one end of the feeding pipe 6 is provided. The connecting part 54 is positioned slightly below the center of the vertical dimension of the collection box 50.
[0059] A curved plate-shaped rib 52 is provided in front of the connecting portion 54, extending in a direction perpendicular to the intake direction line 18a of the intake port 18. In this embodiment, at least a portion of the rib 52 is configured to overlap with the intake port 18 when viewed from the direction of the intake direction line 18a. Thus, the rib 52 protects the connecting portion 54 and guides air in contact with the rib 52 to the intake port 18, thereby improving intake efficiency. Furthermore, at least a portion of the intake port 18 is arranged within the width of the rib 52 when viewed from a direction perpendicular to the intake direction line 18a, and the rib 52 overlaps with the intake port 18 on the intake direction line 18a, and the intake direction line 18a is arranged within the width of the rib 52 when viewed from the connection direction of the fuel pipe 6. This further enhances the effect of guiding air to the intake port 18 using the rib 52.
[0060] Figure 9 yes Figure 7 The cross-sectional view along line IX-IX. The same symbols as described above denote the same or equivalent parts. At the lower end of the collection box 50, a discharge pipe 53 is provided, connecting to the discharge pipe 51. Furthermore, on the bottom wall 17 of the air filter box 10 on which the collection box 50 is installed, a cylindrical outlet member 15 is provided, which has an outlet hole 16 for guiding the evaporated fuel temporarily stored in the collection box 50 into the interior of the air filter box 10.
[0061] In the general-purpose engine set 1 of this embodiment, the air filter box 10 is connected to the collection box 50, and during the operation of the engine E, the inside of the collection box 50 is under negative pressure. For example, it can be configured to be -77.2 Pa at an engine speed of 3600 rpm and -0.1 Pa at an engine speed of 1400 rpm. This allows for the efficient delivery of evaporated fuel from the collection box 50 to the air filter box 10.
[0062] The air intake 18 of the air filter housing 10 is formed on the right side of the bottom wall 17. Furthermore, the collection box 50 is directly mounted on the lower part of the bottom wall 17 along the edge 18b of the air intake 18. Thus, the collection box 50 itself can be used as a guide to efficiently direct air to the air intake 18. In addition, the wall portion 55 of the collection box 50 arranged along the edge 18b of the air intake 18 is thicker than other wall portions. This prevents the air guiding the evaporating fuel stored in the collection box 50 to the air intake 18 from cooling. Furthermore, by increasing the wall thickness only in the portion 55 that comes into contact with the air guided to the air intake 18, the support strength of the connecting portion 54 can be improved while suppressing an increase in the weight of the collection box 50.
[0063] Figure 10 This is a perspective view showing the internal state of the collection box 50 when the recoil starter 40 of the general-purpose engine set 1 is tilted downwards. Furthermore, Figure 11 This is a perspective view showing the internal state of the collection box 50 when the cylinder head 44 of the general-purpose engine pack 1 is tilted downwards. Figure 12 This is a perspective view showing the internal state of the collection box 50 when the output shaft 45 of the general-purpose engine unit 1 is tilted downwards. Figure 13 This is a perspective view showing the internal state of the collection box 50 when the control unit 30 of the general-purpose engine pack 1 is tilted downwards. The same symbols as described above indicate the same or equivalent parts.
[0064] In the general-purpose engine set 1 of this embodiment, in addition to the shape or capacity of the collection box 50, the positions of the outlet member 16, the connection part 54 connecting to the feed pipe 6, and the discharge pipe 53 connecting to the discharge pipe 51 are also provided so that the leakage of stored fuel F to the outside of the collection box 50 can be suppressed no matter which direction it is tilted. Therefore, even when the collection box 50, which is a general-purpose container, is used instead of the tank, the collection box 50 can function well and the cost can be reduced.
[0065] The general-purpose engine set, the type of engine, the shape or structure of the fuel tank or air filter box, the length or wiring method of the feed pipe or feed tube, the shape or structure of the collection box, the shape or structure of the ribs, etc., are not limited to the above embodiments and can be modified in various ways.
Claims
1. A general-purpose engine unit (1) which is configured by arranging a fuel tank (2) and an air cleaner tank (10) side by side in a horizontal direction above an engine (E), characterized in that, have: A collection box (50) is disposed near the aforementioned air filter box (10) and stores the evaporated fuel generated inside the aforementioned fuel tank (2); and, The fuel pipe (6) delivers the aforementioned evaporated fuel from the aforementioned fuel tank (2) to the aforementioned collection tank (50); and, The aforementioned collection box (50) is located above the aforementioned engine (E) and between the aforementioned fuel tank (2) and the aforementioned air filter box (10).
2. The general engine set according to claim 1, wherein, An air intake (18) is provided at the lower part of the aforementioned air filter box (10). The aforementioned collection box (50) is disposed along the edge (18b) of the aforementioned air intake (18).
3. The universal engine set according to claim 2, wherein The aforementioned collection box (50) is provided with a connecting part (54) that connects to one end of the aforementioned fuel pipe (6). Near the aforementioned connecting portion (54), a rib (52) extending in a direction perpendicular to the suction direction line (18a) of the aforementioned suction port (18) is provided. The aforementioned intake direction line (18a) is positioned within the width of the aforementioned rib (52) when viewed from the connection direction of the aforementioned fuel pipe (6).
4. The general engine set according to claim 3, wherein, Viewed from a direction perpendicular to the aforementioned air intake direction line (18a), at least a portion of the aforementioned air intake port (18) is disposed within the width of the aforementioned rib (52), and the aforementioned rib (52) overlaps with the aforementioned air intake port (18) on the aforementioned air intake direction line (18a).
5. The universal engine set according to claim 2, wherein The aforementioned collection box (50) is configured such that the wall portion (55) arranged along the aforementioned edge (18b) is thicker than the other wall portions.
6. The general engine set according to claim 3, wherein, The aforementioned collection box (50) is directly installed on the bottom wall (17) of the aforementioned air filter box (10).
7. The general engine set according to claim 1 or 2, wherein The general-purpose engine set is configured such that the interior of the aforementioned collection box (50) is under negative pressure during the operation of the aforementioned engine (E).