CN217927014U

CN217927014U - Engine

Info

Publication number: CN217927014U
Application number: CN202221550606.9U
Authority: CN
Inventors: 郑和瑞; 吴伟泽; 谢峰; 贺洋洋
Original assignee: Jiangsu Changfa Agricultural Equipment Co Ltd
Current assignee: Jiangsu Changfa Agricultural Equipment Co Ltd
Priority date: 2022-06-20
Filing date: 2022-06-20
Publication date: 2022-11-29
Anticipated expiration: 2032-06-20

Abstract

The utility model provides an engine, include: crankshaft gear, idler gear, first balanced shaft gear and the balanced shaft gear of second, crankshaft gear is including coaxial first gear and the second gear that sets up, and the diameter of first gear is less than the diameter of second gear, and first gear and second gear rotate under the drive of bent axle in step, and idler gear and first gear meshing, first balanced shaft gear and idler gear meshing, the ratio of the angular velocity of first gear and first balanced shaft gear is 1:1, the second balance shaft gear is meshed with the second gear, and the ratio of the angular speed of the second gear to the angular speed of the second balance shaft gear is 1: the crankshaft drives a first gear and a second gear to synchronously rotate, the first gear simultaneously drives a cam shaft gear and an idle gear to rotate, the idle gear drives a first balance shaft gear to rotate, and the second gear drives a second balance shaft gear to rotate. The utility model discloses a whole train compact structure, transmission efficiency is high, and gear figure is few, effectively reduces the volume of engine organism.

Description

Engine

Technical Field

The utility model belongs to the technical field of the engine, especially, engine with double balance axle.

Background

In the prior art, when an engine works, a great reciprocating inertia force is generated due to high-speed reciprocating motion of serial parts such as pistons and the like, which is a main source of vibration and noise generated by the engine. The reciprocating inertial force is generally balanced by providing a balancing mechanism, thereby reducing the mechanical noise and vibration of the engine. For a small engine, due to the fact that the size of the engine is small, movement space is limited, double-shaft balance is very difficult to achieve, the difficulty in arrangement of a gear transmission wheel train is greatly increased, and full balance is more difficult to achieve on the basis. The present application is therefore directed to a compact, dual-shaft balanced engine that overcomes the above-mentioned disadvantages.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an engine.

According to an aspect of the utility model, provide an engine, including organism, bent axle, with bent axle parallel arrangement's camshaft, with bent axle parallel arrangement's first balance shaft and with bent axle parallel arrangement's second balance shaft still includes:

the crankshaft gear is fixed on a crankshaft and comprises a first gear and a second gear which are coaxially arranged, the diameter of the first gear is smaller than that of the second gear, and the first gear and the second gear synchronously rotate under the driving of the crankshaft;

an idler gear in meshing engagement with the first gear;

the first balance shaft gear is fixed on the first balance shaft, the first balance shaft gear is meshed with the idle gear, and the ratio of the angular speed of the first gear to the angular speed of the first balance shaft gear is 1:1;

the second balance shaft gear is fixed on a second balance shaft, the second balance shaft gear is meshed with the second gear, and the ratio of the angular speed of the second gear to the angular speed of the second balance shaft gear is 1:1;

the crankshaft drives the first gear and the second gear to synchronously rotate, the first gear simultaneously drives the cam shaft gear and the idle gear to rotate, the idle gear drives the first balance shaft gear to rotate, and the second gear drives the second balance shaft gear to rotate.

Preferably, the first balance shaft gear and the second balance shaft gear are respectively located at two sides of the first gear in the horizontal direction, and the centers of the first balance shaft gear and the second balance shaft gear are located on the same horizontal straight line.

Preferably, the distance from the first balance shaft gear center to the first gear center is equal to the distance from the second balance shaft gear center to the second gear center.

Preferably, a line connecting the first balance shaft gear center and the second balance shaft gear center is positioned below the first gear center.

Preferably, the gear mechanism further comprises a camshaft gear fixed on the camshaft, the camshaft gear is meshed with the first gear, and the ratio of the angular speed of the first gear to the angular speed of the camshaft gear is 2:1.

preferably, the idler gear center is located below the first balance shaft gear center and the cam shaft gear center is located above the second balance shaft gear center.

Preferably, the bent axle is including being located the first tip outside the organism, the first main journal of being connected with the organism and being located the first crank in the organism, be equipped with cyclic annular boss between first tip and the first main journal, be equipped with the first keyway along bent axle axial extension on the cyclic annular boss, crank gear be equipped with the second keyway that first keyway corresponds, crank gear cover is established on the boss and is fixed a position through parallel key and first keyway and the cooperation of second keyway.

Preferably, the first main journal is provided with a first mounting hole along the axial direction of the crankshaft, the crankshaft gear is provided with a second mounting hole, and the bolt penetrates through the second mounting hole and is fixed to the first mounting hole, so that the first gear and the second gear are fixed on one side of the first main journal, which is far away from the machine body.

Preferably, the first gear and the second gear are of an integrated structure, and the first gear is located on one side of the second gear, which is far away from the machine body.

Preferably, one side of the machine body, which is close to the second balance shaft gear, is provided with a bearing fixing plate, the second balance shaft is connected with the machine body through a bearing, one end of the bearing fixing plate is fixed with the machine body through a bolt, and the other end of the bearing fixing plate is in contact with the bearing to limit and fix the bearing.

Compared with the prior art, the utility model provides an engine has following beneficial effect: the crankshaft gear adopts a duplicate gear, the duplicate gear is formed by coaxially arranging a first gear and a second gear which have different diameters, two balance shaft gears are respectively meshed with the first gear and the second gear, a cam shaft gear is meshed with the second gear, the whole gear train is compact in structure, high in transmission efficiency and small in gear number, a crank case and a rotating part movement space can be further compressed, and the size of an engine body is effectively reduced.

Drawings

The invention will be described in further detail with reference to the following drawings and embodiments:

fig. 1 is a schematic structural diagram of a gear train of an engine according to the present invention;

FIG. 2 is a side view of the engine of the present invention;

FIG. 3 is a side view of the gear chamber cover of the present invention;

fig. 4 is a cross-sectional view of an engine of the present invention;

FIG. 5 is a front view of the gear chamber cover of the present invention;

fig. 6 is a first perspective view of the engine of the present invention;

fig. 7 is a second perspective view of the engine of the present invention;

fig. 8 is a third perspective view of the engine of the present invention.

The crankshaft assembly comprises a machine body 1, a crankshaft 11, a first end portion 111, a first main journal 112, a first main journal 1121, a first mounting hole 113, a first crank 114, an annular boss 115, a first key groove 116, a second key groove 116, a camshaft 12, a first balance shaft 13, a second balance shaft 14, a crankshaft gear 15, a crankshaft gear 151, a first gear 152, a second gear 153, a second mounting hole 16, a camshaft gear 16, a first balance shaft gear 17, a second balance shaft gear 18, a second balance shaft gear 19, an idler gear 2, a cylinder head 3, an oil pan 3, a gear chamber cover 4, a bearing bush 5 and a bearing fixing plate 6.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

For the sake of simplicity, only the parts relevant to the present invention are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".

It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

In this context, it is to be understood that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.

In order to more clearly illustrate embodiments of the present invention or technical solutions in the prior art, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be obtained from these drawings without inventive effort.

Referring to fig. 1 and 4, an engine includes a body 1, a cylinder head 2 disposed on the top of the body 1, an oil pan 3 disposed on the bottom of the body 1, and a gear chamber cover 4 disposed on the side of the body 1. The crankshaft 11, the camshaft 12, the first balance shaft 13 and the second balance shaft 14 are arranged in the machine body, and the crankshaft 11, the camshaft 12, the first balance shaft 13 and the second balance shaft 14 are arranged in parallel.

A crankshaft gear 15, a camshaft gear 16 meshed with the crankshaft gear 15, an idle gear 19 meshed with the crankshaft gear 15, a first balance shaft gear 17 meshed with the idle gear 19 and a second balance shaft gear 18 meshed with the crankshaft gear 15 are arranged in a space formed by the gear chamber cover 4 and the side edge of the machine body 1.

Referring to fig. 2, 5 and 6, the crank gear 15 is fixed at one end of the crank shaft 11, the crank gear 15 includes a first gear 151 and a second gear 152 coaxially disposed with the first gear 151, a diameter of the first gear 151 is smaller than a diameter of the second gear 152, and the first gear 151 is located at a side of the second gear 152 away from the machine body 1. Preferably, the first gear 151 and the second gear 152 are dual gears of an integrally formed structure.

In other embodiments, the first gear 151 and the second gear 152 may also be formed by non-integral molding, and may be formed by combining two gears, so as to ensure that the first gear 151 and the second gear 152 rotate synchronously under the driving of the crankshaft, that is, the angular velocities of the crankshaft, the first gear 151, and the second gear 152 are the same.

Referring to fig. 4, the camshaft gear 16 is fixed to one end of the camshaft 12 and is engaged with the first gear 151, and the ratio of the angular velocity of the first gear 151 to the camshaft gear 16 is 2:1, i.e. the transmission ratio of the first gear 151 to the camshaft gear 16 is 2:1. the second balance shaft gear 18 is fixed at one end of the second balance shaft 14 and meshed with the second gear 152, and the ratio of the angular speed of the second gear 152 to that of the second balance shaft gear 18 is 1:1, i.e., the gear ratio of the second gear 152 to the second balance shaft gear 18 is 1:1, the center of the second balance shaft gear 18 is located below the center of the cam shaft gear 16.

The first balance shaft gear 17 is fixed at one end of the first balance shaft 13 and is meshed with the first gear 151 through the idle gear 19, and the ratio of the angular speed of the first gear 151 to the angular speed of the first balance shaft gear 17 is 1:1, namely, the transmission ratio of the first gear 151 to the first balance shaft gear 17 is 1:1. the first balance shaft gear 17 and the second balance shaft gear 18 are respectively positioned at two sides of the first gear 151 in the horizontal direction, the center of the first balance shaft gear 17 and the center of the second balance shaft gear 18 are positioned on the same horizontal straight line, and the connecting line of the center of the first balance shaft gear 17 and the center of the second balance shaft gear 18 is positioned below the center of the first gear 151.

The distance from the center of the first balance shaft gear 17 to the center of the first gear 151 is equal to the distance from the center of the second balance shaft gear 18 to the center of the second gear 151. In other embodiments, the line connecting the center of the first balance shaft gear 17 and the center of the second balance shaft gear 18 is not limited to be below the center of the first gear 151, and the line connecting them may be on the same straight line with the center of the first gear 151, or the line connecting them may be above the center of the first gear 151.

The center of the idle gear 19 is positioned below the central connecting line of the first balance shaft gear 17 and the second balance shaft gear 18. In other embodiments, the center of the idle gear 19 is not limited to be located below the line connecting the center of the first balance shaft gear 17 and the center of the second balance shaft gear 18.

The utility model discloses an engine during operation, bent axle 11 drives first gear 151 and second gear 152 synchronous rotation, and first gear 151 drives camshaft gear 16 and idler gear 19 simultaneously and rotates, and idler gear 19 drives first balanced shaft gear 17 and rotates, and second gear 152 drives second balanced shaft gear 18 simultaneously and rotates. The whole gear train has compact structure, high transmission efficiency and less gears, can further compress the motion space of the crank case and the rotating part, effectively reduces the volume of an engine body, and has lower height than the traditional S gear train.

Referring to fig. 4, a bearing fixing plate 6 is disposed on one side of the machine body 1 close to the second balance shaft gear 18, the second balance shaft 14 is connected to the machine body 1 through a bearing (not shown in the figure), one end of the bearing fixing plate 6 is fixed to the machine body 1 through a bolt, and the other end of the bearing fixing plate 6 contacts with the bearing, so as to axially limit and fix the bearing.

Referring to fig. 3 and 6, the crankshaft 11 includes a first end 111 located outside the machine body 1, a first main journal 112 connected to the machine body 1 through the bearing shells 5, and a first crank 113 located inside the machine body 1. The first main journal 112 is located between the first end portion 111 and the first crank 113, an annular boss 114 is arranged between the first end portion 111 and the first main journal 112, a first key groove 115 extending along the axial direction of the crankshaft 11 is arranged on the annular boss 114, the crankshaft gear 15 is provided with a second key groove 116 corresponding to the first key groove 115, and the crankshaft gear 15 is sleeved on the annular boss 114 and is matched with the first key groove 115 and the second key groove 116 through a flat key for positioning.

Referring to fig. 6 and 7, the first main journal 112 is provided with 3 first mounting

holes

1121,3 in the axial direction of the crankshaft 11, and the first mounting holes 1121 are uniformly distributed around the annular boss 114. The crank gear 15 is provided with a second mounting hole 153, and the second mounting hole 153 penetrates the first gear 151 and the second gear 152 in the axial direction, and the crank gear 15 and the crank shaft 11 can be fixed by a bolt.

Bolts are fixed to the first mounting holes 1121 through the second mounting holes 153, thereby fixing the first gear 151 and the second gear 152 at one end of the first main journal 112. The crankshaft gear 15 and the crankshaft 11 adopt the positioning mode, and compared with a traditional engine gear train, the positioning device is more convenient to produce and assemble and effectively improves the assembling efficiency.

It will be apparent to those skilled in the art that various modifications and variations can be made to the above-described exemplary embodiments of the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

1. An engine, includes organism, bent axle, with the camshaft of bent axle parallel arrangement, with the first balanced axle of bent axle parallel arrangement and with the balanced axle of bent axle parallel arrangement's second, its characterized in that still includes:

an idler gear in meshing engagement with the first gear;

a second balance shaft gear fixed to a second balance shaft, the second balance shaft gear meshing with the second gear, the ratio of the angular velocities of the second gear and the second balance shaft gear being 1:1;

2. The engine of claim 1, wherein the first balance shaft gear and the second balance shaft gear are respectively located at two sides of the first gear in the horizontal direction, and the centers of the first balance shaft gear and the second balance shaft gear are located on the same horizontal straight line.

3. The engine of claim 2, wherein the first balance shaft gear center is equidistant from the first gear center and the second balance shaft gear center is equidistant from the second gear center.

4. The engine of claim 3, wherein a line connecting the first balance shaft gear center and the second balance shaft gear center is located below the first gear center.

5. The engine of claim 1, further comprising a camshaft gear fixed to the camshaft, the camshaft gear meshing with the first gear, the ratio of the angular velocities of the first gear and camshaft gear being 2:1.

6. the engine of claim 5 wherein said idler gear center is below said first balance shaft gear center and said camshaft gear center is above said second balance shaft gear center.

7. The engine of claim 1, wherein the crankshaft comprises a first end portion located outside the engine body, a first main journal connected with the engine body and a first crank located inside the engine body, an annular boss is arranged between the first end portion and the first main journal, a first key groove extending in the axial direction of the crankshaft is formed in the annular boss, a second key groove corresponding to the first key groove is formed in the crankshaft gear, and the crankshaft gear is sleeved on the boss and is located through a flat key in cooperation with the first key groove and the second key groove.

8. The engine of claim 7, wherein the first main journal is provided with a first mounting hole along the axial direction of the crankshaft, the crankshaft gear is provided with a second mounting hole, and a bolt is fixed to the first mounting hole through the second mounting hole so as to fix the first gear and the second gear on the side of the first main journal away from the engine body.

9. The engine of claim 1, wherein the first gear and the second gear are a unitary structure, the first gear being located on a side of the second gear remote from the engine block.

10. The engine of claim 9, wherein a bearing fixing plate is arranged on one side of the engine body close to the second balance shaft gear, the second balance shaft is connected with the engine body through a bearing, one end of the bearing fixing plate is fixed with the engine body through a bolt, and the other end of the bearing fixing plate is in contact with the bearing to limit and fix the bearing.