Universal double-cylinder engine

Abstract

The utility model discloses a general double-cylinder engine which comprises a left cylinder head and a right cylinder head, a carburetor, an air inlet manifold and an air inlet pipe are arranged between the left cylinder head and the right cylinder head, an air inlet elbow is arranged between the carburetor and the air inlet manifold, the air inlet pipe, the carburetor and the air inlet elbow are connected through at least two first double-end bolts, and the carburetor and the air inlet elbow are connected through at least two second double-end bolts. The sealing gasket between the carburetor and the air inlet pipe and the sealing gasket between the carburetor and the air inlet bent pipe are both provided with through holes matched with the first double-end bolt. According to the scheme, the problem that in the prior art, a general double-cylinder engine is prone to poor air inlet is solved.

Description

Technical Field

[0001] The utility model relates to a fuel engine, in particular to a universal double-cylinder engine. Background Art

[0002] Chinese patent document CN209083441U discloses a universal gasoline engine, including an engine body with a cylinder head A and a cylinder head B, a carburetor is arranged between the cylinder head A and the cylinder head B, an air guide cover is arranged on one side of the engine body, and a cylindrical air filter is horizontally arranged above the air guide cover. The air filter is connected to the inlet end of the carburetor through an intake hose and an intake pipe, and the outlet end of the carburetor is respectively connected to the cylinder head A and the cylinder head B through an intake manifold located between the cylinder head A and the cylinder head B and close to the air filter.

[0003] In the prior art, cylinder head A and cylinder head B are arranged in a V shape, one end of the carburetor needs to be connected to the intake pipe, and the other end needs to be connected to the intake manifold, and there are other parts around. During assembly, the intake manifold needs to be installed and fixed on the engine body first, and then the carburetor is connected to the intake manifold, and finally the intake pipe is connected to the carburetor. In actual operation, the installation surfaces of the intake pipe, carburetor and intake manifold are aligned first, and then a single-head long screw is used to pass through the intake pipe, carburetor and intake manifold in sequence to connect and fix the three. There are sealing gaskets between the intake pipe and the carburetor and between the carburetor and the intake manifold. In actual assembly, when the intake pipe, carburetor and intake manifold are aligned first, the sealing gasket located between the joint surfaces is easy to fall off, resulting in poor intake of the intake system. Utility Model Content

[0004] The utility model aims to provide a universal twin-cylinder engine to solve the problem of poor air intake in the universal twin-cylinder engine in the prior art.

[0005] In order to achieve the above-mentioned purpose, the basic scheme of the utility model provides a universal two-cylinder engine, including a left cylinder head and a right cylinder head, a carburetor, an intake manifold and an intake pipe are arranged between the left cylinder head and the right cylinder head, an intake elbow is arranged between the carburetor and the intake manifold, the intake pipe, the carburetor and the intake elbow are connected by at least two first stud bolts, and the sealing gasket between the carburetor and the intake pipe and the sealing gasket between the carburetor and the intake elbow are both provided with through holes matching the first stud bolts.

[0006] Preferably, the intake elbow is connected to the intake manifold via at least two second stud bolts, and a through hole cooperating with the second stud bolts is provided on the sealing gasket between the intake elbow and the intake manifold.

[0007] Preferably, the mounting hole on the intake elbow that cooperates with the second stud bolt is a U-shaped hole, and the opening direction of the U-shaped hole is parallel to the axial direction of the first stud bolt and faces away from the carburetor.

[0008] Preferably, a connecting bolt is further provided between the intake elbow and the intake manifold, and a through hole cooperating with the connecting bolt is provided on the intake elbow.

[0009] Preferably, the solenoid valve at the bottom of the carburetor is arranged toward the intake manifold and is located below the intake manifold.

[0010] Preferably, a heat insulation plate is provided between the intake elbow and the intake manifold.

[0011] The utility model has the following beneficial effects:

[0012] 1. During assembly, first connect the two first stud bolts to the intake elbow, then sleeve the sealing gasket between the carburetor and the intake elbow on the first stud bolts through the through holes, so that the sealing gasket is supported and positioned by the first stud bolts, and then sequentially connect the carburetor, the sealing gasket between the carburetor and the intake pipe, and the intake pipe to the first stud bolts. The sealing gasket is supported and positioned by installing the first stud bolts. Compared with the prior art of assembling using single-headed bolts, this avoids the situation in which the sealing gasket shifts and causes sealing failure, thereby solving the problem of poor air intake in the intake system.

[0013] 2. The sealing gasket between the intake elbow and the intake manifold is supported and positioned by the second stud bolt, thereby avoiding the phenomenon of displacement of the sealing gasket between the intake elbow and the intake manifold, which is beneficial to further improve the reliability of the intake system.

[0014] 3. By providing a U-shaped hole on the intake elbow, the intake elbow can move along the axial direction of the first stud bolt and be clamped on the second stud bolt, so that there are multiple options for the assembly direction of the intake elbow, which is beneficial to the assembly operation.

[0015] 4. By setting the connecting bolts, the intake elbow can be better limited and fixed to reduce the connection risk caused by the setting of the U-shaped hole, thereby improving the structural stability of the intake system.

[0016] 5. The solenoid valve of the carburetor is set below the intake manifold, so as to make full use of the space and make the structure of the engine intake system more compact.

[0017] 6. The heat insulation plate is set to block the heat transfer between the intake manifold and the intake elbow, thereby reducing the impact of heat on the carburetor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a schematic diagram of a general twin-cylinder engine embodiment of the utility model;

[0019] Figure 2 for Figure 1 Assembly explosion diagram of the intake pipe, carburetor, intake elbow and intake manifold;

[0020] Figure 3 for Figure 2 A cross-sectional view along the axial direction of the first stud bolt and the second stud bolt;

[0021] Figure 4 for Figure 2 A cross-sectional view along the axis of the connecting bolt;

[0022] Figure 5 for Figure 1 Top view of the middle intake elbow. DETAILED DESCRIPTION

[0023] The following is further described in detail through specific implementation methods:

[0024] The figure marks in the drawings of the specification include: crankcase 1, right cylinder head 2, left cylinder head 3, intake manifold 4, heat insulation plate 5, intake elbow 6, carburetor 7, intake pipe 8, second stud bolt 9, second nut 10, connecting bolt 11, first stud bolt 12, sealing gasket A13, first nut 14, solenoid valve 15, sealing gasket B16, mounting hole 17.

[0025] The embodiment is basically as shown in the attached Figures 1 to 5 As shown: a universal twin-cylinder engine, comprising a crankcase 1, a left cylinder head 3 and a right cylinder head 2 are arranged on the top of the crankcase 1, and the left cylinder head 3 and the right cylinder head 2 are arranged in a V shape. A carburetor 7, an intake manifold 4 and an intake pipe 8 are arranged between the left cylinder head 3 and the right cylinder head 2, and the carburetor 7 is located between the intake pipe 8 and the intake manifold 4. An intake elbow 6 is arranged between the carburetor 7 and the intake manifold 4, and the intake pipe 8, the carburetor 7 and the intake elbow 6 are connected by at least two first stud bolts 12. In this embodiment, four first stud bolts 12 are arranged and distributed at the four corners of the rectangle. In this embodiment, the intake elbow 6 is provided with a threaded hole matched with the first stud bolt 12, so that one end of the first stud bolt 12 is threadedly connected with the intake elbow 6, and the carburetor 7 and the intake pipe 8 are both provided with through holes for the first stud bolt 12 to pass through, and the first stud bolt 12 is threadedly connected with the first nut 14 at one end away from the intake elbow 6. The sealing gasket between the carburetor 7 and the intake pipe 8 and the sealing gasket A13 between the carburetor 7 and the intake elbow 6 are both provided with through holes matched with the first stud bolt 12. The solenoid valve 15 at the bottom of the carburetor 7 is arranged toward the intake manifold 4 and is located below the intake manifold 4.

[0026] The intake elbow 6 is connected to the intake manifold 4 by at least two second stud bolts 9. In this embodiment, two second stud bolts 9 are provided, and the two second stud bolts 9 are located at one end of the intake elbow 6 away from the carburetor 7. In this embodiment, a threaded hole matching with the second stud bolt 9 is provided on the intake manifold 4, and a mounting hole 17 for the second stud bolt 9 to pass through is provided on the intake elbow 6. The second nut 10 is threadedly connected to one end of the second stud bolt 9 away from the intake manifold 4. A through hole matching with the second stud bolt 9 is provided on the sealing gasket B16 between the intake elbow 6 and the intake manifold 4.

[0027] In this embodiment, the mounting hole 17 on the intake elbow 6 that matches the second stud bolt 9 is a U-shaped hole, the opening direction of the U-shaped hole is parallel to the axial direction of the first stud bolt 12 and faces away from the carburetor 7. A connecting bolt 11 is also provided between the intake elbow 6 and the intake manifold 4, and a through hole that matches the connecting bolt 11 is provided on the intake elbow 6. The connecting bolt 11 and the two second stud bolts 9 are distributed at the three corners of the triangle. A heat shield 5 is provided between the intake elbow 6 and the intake manifold 4.

[0028] The specific implementation process is as follows: during assembly, first, the intake manifold 4 is connected and fixed to the left cylinder head 3 and the right cylinder head 2, two second stud bolts 9 are connected to the intake manifold 4, and the sealing gasket B16 and the heat insulation plate 5 between the intake elbow 6 and the intake manifold 4 are installed on the second stud bolts 9; secondly, the first stud bolt 12 is connected to the intake elbow 6, and the sealing gasket A13 between the carburetor 7 and the intake elbow 6 is sleeved on the first stud bolt 12, and the carburetor 7 is installed on the first stud bolt 12. The sealing gasket between the pipes 8 is sleeved on the first stud bolt 12, and finally the intake pipe 8 is installed on the first stud bolt 12, and then the first nut 14 is used to make the intake pipe 8, the carburetor 7 and the intake elbow 6 fit and fix each other; finally, the intake elbow 6 is clamped on the second stud bolt 9 along the axial direction of the first stud bolt 12, and the second stud bolt 9 is clamped into the U-shaped hole, and then the second nut 10 is used to fit and fix the intake elbow 6, the heat insulation board 5 and the intake manifold 4, and the intake elbow 6 is connected and fixed to the intake manifold 4 using the connecting bolt 11. During the whole assembly process, the sealing gaskets between the carburetor 7 and the intake pipe 8, the carburetor 7 and the intake elbow 6, and the intake elbow 6 and the intake manifold 4 are all supported and positioned by the first stud bolt 12 and the second stud bolt 9, so as to avoid the problem of poor intake of the intake system caused by displacement of the sealing gasket during assembly.

[0029] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A general two-cylinder engine, comprising a left cylinder head and a right cylinder head, wherein a carburetor, an intake manifold and an intake pipe are arranged between the left cylinder head and the right cylinder head, characterized in that: An intake elbow is arranged between the carburetor and the intake manifold. The intake pipe, carburetor and intake elbow are connected by at least two first stud bolts. The sealing gasket between the carburetor and the intake pipe and the sealing gasket between the carburetor and the intake elbow are both provided with through holes that cooperate with the first stud bolts.

2. A universal twin-cylinder engine according to claim 1, characterized in that: The intake elbow is connected to the intake manifold via at least two second stud bolts, and a through hole matching the second stud bolts is provided on the sealing gasket between the intake elbow and the intake manifold.

3. A universal twin-cylinder engine according to claim 2, characterized in that: The mounting hole on the intake elbow that matches the second stud bolt is a U-shaped hole, and the opening direction of the U-shaped hole is parallel to the axial direction of the first stud bolt and faces away from the carburetor.

4. A universal twin-cylinder engine according to claim 3, characterized in that: A connecting bolt is also arranged between the intake elbow and the intake manifold, and a through hole matching with the connecting bolt is arranged on the intake elbow.

5. A universal twin-cylinder engine according to claim 4, characterized in that: The solenoid valve at the bottom of the carburetor is arranged toward the intake manifold and is located below the intake manifold.

6. A universal twin-cylinder engine according to claim 5, characterized in that: A heat insulation plate is arranged between the intake elbow and the intake manifold.

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