A double balance shaft system for a large displacement single cylinder gasoline engine

Abstract

The application provides a double balance shaft system of a large-displacement single-cylinder gasoline engine, a big end (5) and a small end (6) of a connecting rod (3) are connected with a crankshaft arm (1) and a piston (4) respectively, the crankshaft arm (1) is penetrated by a crankshaft (2), a crankshaft driving gear (7) is installed on the crank of the front side of the crankshaft (2), the left side and the right side of the crankshaft assembly are respectively provided with a left balance system and a right balance system, a left driving device on the left balance system is in transmission connection with the left side of the crankshaft driving gear (7), a right driving device on the right balance system is in transmission connection with the right side of the crankshaft driving gear (7), the crankshaft driving gear (7) rotates to drive the left balance system to rotate through the left driving device and drive the right balance system to rotate through the right driving device. The application effectively balances the inertial force generated by the small end of the connecting rod and the piston part, thereby eliminating the first-order vibration of the engine, improving the comfort of driving and riding, and prolonging the overall service life of the vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the equipment on the gasoline engine, and particularly to a double balance shaft system of a large displacement single cylinder gasoline engine. BACKGROUND

[0002] As a kind of riding tool, consumers have certain requirements on the power, comfort, reliability and economy of all-terrain vehicles, and the engine is the part that most affects these performances in the riding tool. Single cylinder gasoline engine of various displacements is the main choice of current all-terrain vehicles. However, single cylinder gasoline engine as a piston internal combustion engine has inherent defects. The piston internal combustion engine converts the reciprocating linear motion of the piston in the cylinder into the rotary motion of the crankshaft through the crank connecting rod mechanism. In the process of motion, the crank, connecting rod, piston and other components will generate rotary inertia force and reciprocating inertia force. The rotary inertia force can be balanced by the crankshaft counterweight, while the reciprocating inertia force is an unbalanced free force. If no measures are taken, it will be transmitted to the vehicle frame, causing vehicle vibration and affecting the comfort of riding.

[0003] The direction of the reciprocating inertia force is along the center line of the cylinder. If the reciprocating inertia force is to be completely balanced, another inertia force of equal size and opposite direction is needed. The balance weight on the crank arm cannot completely balance the reciprocating inertia force, and the method of balance shaft needs to be used. For small and medium displacement single cylinder engines, single balance shaft can better eliminate the first order vibration of the engine, but for large displacement engines, due to the larger weight of the connecting rod small end and the piston and piston pin part, the commonly used single balance shaft system cannot meet the balance of the inertia force generated by the connecting rod small end and the piston part. SUMMARY

[0004] The present application provides a double balance shaft system of a large displacement single cylinder gasoline engine, which can effectively balance the inertia force generated by the connecting rod small end and the piston part to eliminate the first order vibration of the engine, improve the comfort of riding and prolong the overall service life of the vehicle.

[0005] The present application adopts the following technical scheme: a double balance shaft system of a large displacement single cylinder gasoline engine, the crankshaft assembly of which mainly includes a crank arm and a crankshaft, the crank arm is connected with the piston through a connecting rod, the large end of the connecting rod is connected with the crank arm, and the small end of the connecting rod is connected with the piston, the crankshaft is inserted into the crank arm, a crankshaft driving gear is installed on the crank of the front side of the crankshaft, the left side and the right side of the crankshaft assembly are respectively provided with a left balance system and a right balance system, the left balance system and the right balance system are symmetrically distributed on the two sides of the crankshaft assembly, a left driving device is arranged on the left balance system, the left side of the crankshaft driving gear is in transmission connection with the left driving device, a right driving device is arranged on the right balance system, the right side of the crankshaft driving gear is in transmission connection with the right driving device, and the crankshaft driving gear rotates to drive the left balance system to rotate through the left driving device and drive the right balance system to rotate through the right driving device.

[0006] Furthermore, the left and right balance systems are respectively configured as a left balance shaft assembly and a right balance shaft assembly. The left balance shaft assembly mainly includes a left balance shaft with a left balance arm fixed on it. The right balance shaft assembly mainly includes a right balance shaft with a right balance arm fixed on it. The left and right balance shafts are parallel to the crankshaft. The left and right balance arms are located on both sides of the crankshaft arm and are in contact with it. The left drive device is configured as a left balance shaft gear, and the right drive device is configured as a right balance shaft gear. The left balance shaft gear is press-fitted onto the left balance shaft, and the right balance shaft gear is press-fitted onto the right balance shaft. The left and right balance shaft gears are in the same plane as the crankshaft drive gear. The crankshaft drive gear meshes with the left and right balance shaft gears respectively, and the crankshaft drive gear meshes with the left and right balance shaft gears in opposite directions. When the left balance shaft gear rotates, it drives the left balance shaft to rotate, generating a reverse centrifugal force. The right balance shaft gear drives the right balance shaft to rotate, generating a reverse centrifugal force.

[0007] Furthermore, the right side of the left balance arm is located in the mounting groove I provided on the left side of the crankshaft arm, and the left side of the right balance arm is located in the mounting groove II provided on the right side of the crankshaft arm.

[0008] Furthermore, the left and right balance arms are configured as arc-shaped arms.

[0009] Furthermore, the left balance shaft and left balance arm are integrated, and the right balance shaft and right balance arm are integrated. This invention has the following beneficial effects: By adopting the above technical solution, the dual balance shaft system of this invention can effectively balance part of the inertial force generated by the crankshaft connecting rod small end and piston of a single-cylinder large-displacement engine, and can rationally utilize the internal space of the crankcase. It has a simple and compact structure, a significant effect in canceling first-order vibrations, and significantly improves the driving experience of the vehicle. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0012] Figure 2 This is an exploded view of Embodiment 1 of the present invention. Detailed Implementation

[0013] The processing embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more explicit definition of the scope of protection of the present invention.

[0014] exist Figure 1 and Figure 2 This invention provides a dual balance shaft system for a large-displacement single-cylinder gasoline engine. Its crankshaft assembly mainly includes a crankshaft arm 1 and a crankshaft 2. The crankshaft arm 1 is connected to a piston 4 via a connecting rod 3. The large end 5 of the connecting rod 3 is connected to the crankshaft arm 1, and the small end 6 of the connecting rod 3 is connected to the piston 4. The crankshaft 2 passes through the crankshaft arm 1. A crankshaft drive gear 7 is mounted on the crank at the front of the crankshaft 2. A left balance system and a right balance system are respectively provided on the left and right sides of the crankshaft assembly, symmetrically distributed on both sides. The left balance system has a left drive device, and the left side of the crankshaft drive gear 7 is connected to the left drive device. The right balance system has a right drive device, and the right side of the crankshaft drive gear 7 is connected to the right drive device. After the crankshaft drive gear 7 rotates, it drives the left balance system to rotate via the left drive device and the right balance system to rotate via the right drive device. In this embodiment, the left and right balance systems are respectively configured as a left balance shaft assembly and a right balance shaft assembly. The left balance shaft assembly mainly... The system includes a left balance shaft 8, on which a left balance arm 9 is fixed. The right balance shaft assembly mainly includes a right balance shaft 10, on which a right balance arm 11 is fixed. The left balance shaft 8 and the right balance shaft 10 are parallel to the crankshaft 2. The left balance arm 9 and the right balance arm 11 are located on both sides of the crankshaft arm 1 and are in contact with the crankshaft arm 1. The left drive device is configured as a left balance shaft gear 12, and the right drive device is configured as a right balance shaft gear 13. The left balance shaft gear 12 is press-fitted onto the left balance shaft 8, and the right balance... The crankshaft gear 13 is press-fitted onto the right balance shaft 10. The left balance shaft gear 12 and the right balance shaft gear 13 are in the same plane as the crankshaft drive gear 7. The crankshaft drive gear 7 meshes with the left balance shaft gear 12 and the right balance shaft gear 13 respectively, and the crankshaft drive gear 7 meshes with the left balance shaft gear 12 and the right balance shaft gear 13 in opposite directions. After the left balance shaft gear 12 rotates, it drives the left balance shaft 8 to rotate, generating a reverse centrifugal force. The right balance shaft gear 12 drives the right balance shaft 10 to rotate, generating a reverse centrifugal force. In this embodiment, the right side of the left balance arm 9 is located in the mounting groove I 14 provided on the left side of the crankshaft arm 1, and the left side of the right balance arm 11 is located in the mounting groove II 15 provided on the right side of the crankshaft arm 1. In this embodiment, the left balance arm 9 and the right balance arm 11 are set as arc-shaped arms. In this embodiment, the left balance shaft 8 and the left balance arm 9 are set as one piece, and the right balance shaft 10 and the right balance arm 11 are set as one piece.

[0015] The process of using this invention is as follows: When the engine generates a reciprocating inertial force on the piston 4 through the combustion pressure, it is then transmitted to the crankshaft assembly via the connecting rod 3, causing the crankshaft to rotate. The rotation of the crankshaft causes the crankshaft drive gear 7, which is pressed onto the crankshaft 2, to rotate. After the crankshaft drive gear 7 rotates, it causes the left balance shaft gear 12 and the right balance shaft gear 13, which mesh with it, to rotate in opposite directions. The left balance shaft gear 12 causes the left balance shaft 8 to rotate in opposite directions, and the right balance shaft gear 13 causes the right balance shaft 10 to rotate in opposite directions. The reverse rotation of the left balance shaft 8 and the reverse rotation of the right balance shaft 10 generate opposite centrifugal forces to balance the reciprocating inertial force that the crank itself cannot completely balance by the rotation of the counterweight.

[0016] Not limited to this, any variations or substitutions conceived without inventive effort should be included within the scope of protection of this invention. Therefore, the scope of protection of this invention should be determined by the scope defined in the claims.

Claims

1. A dual balance shaft system for a large-displacement single-cylinder gasoline engine, wherein its crankshaft assembly mainly includes a crankshaft arm (1) and a crankshaft (2), the crankshaft arm (1) is connected to a piston (4) via a connecting rod (3), the large end (5) of the connecting rod (3) is connected to the crankshaft arm (1), the small end (6) of the connecting rod (3) is connected to the piston (4), the crankshaft (2) is inserted inside the crankshaft arm (1), and a crankshaft drive gear (7) is installed on the crank on the front side of the crankshaft (2), characterized in that... The crankshaft assembly has a left balance system and a right balance system on its left and right sides, respectively. The left and right balance systems are symmetrically distributed on both sides of the crankshaft assembly. The left balance system has a left drive device, and the left side of the crankshaft drive gear (7) is connected to the left drive device. The right balance system has a right drive device, and the right side of the crankshaft drive gear (7) is connected to the right drive device. After the crankshaft drive gear (7) rotates, it drives the left balance system to rotate through the left drive device and the right balance system to rotate through the right drive device. The left and right balance systems are respectively set as a left balance shaft assembly and a right balance shaft assembly. The left balance shaft assembly mainly includes a left balance shaft (8), and a left balance arm (9) is fixed on the left balance shaft (8). The right balance shaft assembly mainly includes a right balance shaft (10), and a right balance arm (11) is fixed on the right balance shaft (10). The left balance shaft (8) and the right balance shaft (10) are connected to the crankshaft assembly. The shaft (2) is parallel, and the left balance arm (9) and the right balance arm (11) are located on both sides of the crankshaft arm (1) and in contact with the crankshaft arm (1). The left drive device is set as the left balance shaft gear (12), and the right drive device is set as the right balance shaft gear (13). The left balance shaft gear (12) is pressed on the left balance shaft (8), and the right balance shaft gear (13) is pressed on the right balance shaft (10). The left balance shaft gear (12) and the right balance shaft gear (13) are in the same plane as the crankshaft drive gear (7). The crankshaft drive gear (7) meshes with the left balance shaft gear (12) and the right balance shaft gear (13) respectively. The crankshaft drive gear (7) meshes with the left balance shaft gear (12) and the right balance shaft gear (13) in opposite directions. After the left balance shaft gear (12) rotates, it drives the left balance shaft to rotate and generates a reverse centrifugal force. The right balance shaft gear (13) drives the right balance shaft to rotate and generates a reverse centrifugal force.

2. The dual balance shaft system for a large-displacement single-cylinder gasoline engine according to claim 1, characterized in that: The right side of the left balance arm (9) is located in the mounting groove I (14) provided on the left side of the crankshaft arm (1), and the left side of the right balance arm (11) is located in the mounting groove II (15) provided on the right side of the crankshaft arm (1).

3. The dual balance shaft system for a large-displacement single-cylinder gasoline engine according to claim 1 or 2, characterized in that: The left balance arm (9) and right balance arm (11) are configured as arc-shaped arms.

4. The dual balance shaft system for a large-displacement single-cylinder gasoline engine according to claim 1, characterized in that: The left balance shaft (8) and the left balance arm (9) are integrated, and the right balance shaft (10) and the right balance arm (11) are integrated.

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