Noise reduction engine structure

Abstract

The present invention relates to the field of engine technology, and discloses a noise-reducing engine structure, comprising an engine body, wherein the engine body comprises a housing, a crankshaft, a cylinder, a piston, and an oil pump, wherein a bearing seat is provided in the housing, the crankshaft and the bearing seat are connected via a crankshaft bearing, a bearing push bolt mechanism acting on the crankshaft bearing is installed on the housing, the main journal axis of the crankshaft and the axis of the piston are perpendicular to each other, and the two straight lines are on the same plane S1, a plane S2 is formed on the side of the oil pump close to the cylinder, and the main journal axis is on plane S2; plane S1 intersects with plane S2 to form an acute angle region β facing the cylinder, and the point of action of the bearing push bolt mechanism acting on the crankshaft bearing falls within region β, and the bearing push bolt mechanism always applies a force to the crankshaft bearing in the direction opposite to the piston. The present invention effectively avoids the formation of a gap between the crankshaft bearing and the bearing seat when the piston moves upward, thereby avoiding impact noise, thereby improving engine noise, and extending the service life of parts.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a noise-reducing engine structure. Background Art

[0002] An engine is a machine that converts other forms of energy into kinetic energy. Examples include internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, and electric motors. Internal combustion engines typically convert chemical energy into mechanical energy and are primarily composed of a cylinder block, cylinder liner, cylinder head, crankshaft, connecting rod, piston, fuel injector, and oil pump. A stroke is the process of a piston moving from top dead center to bottom dead center, or vice versa, and includes four processes: intake, compression, expansion, and exhaust. As the primary power source for automobiles, motorcycles, and other devices, the engine's reciprocating piston stroke causes irregular movement of the crankshaft during operation. This axial and radial movement causes noise, along with wear and tear, shortening the service life of components. Therefore, it's necessary to limit this irregular crankshaft movement. The existing technology uses a bearing push bolt mechanism as a mechanism in the engine to improve the crankshaft movement force and optimize the NVH performance. Although it can suppress the axial and radial movement of the crankshaft, when the piston moves from the bottom dead center to the top dead center, it will drive the crank to deflect upward. At this time, there will be a gap between the crankshaft bearing and the bearing seat. When the piston explodes downward, the crankshaft bearing will still collide with the bearing seat due to the existence of the gap, so it will still generate noise, and it will also increase the wear of the parts and affect the life of the parts. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: how to prevent the upward movement of the piston from causing a gap between the crankshaft bearing and the bearing seat while suppressing the axial and radial movement of the crankshaft, so as to solve the technical problem of high engine noise.

[0004] In order to solve the above technical problems, the present invention provides a noise reduction engine structure, comprising an engine body, the engine body comprising a housing, a crankshaft, a cylinder, a piston, and an oil pump, a bearing seat being provided in the housing, the crankshaft and the bearing seat being connected via a crankshaft bearing, and a bearing push bolt mechanism acting on the crankshaft bearing being installed on the housing;

[0005] The main journal axis of the crankshaft and the axis of the piston are perpendicular to each other, and the two straight lines are on the same plane S1;

[0006] A plane S2 is formed on the side of the oil pump close to the cylinder body, and the axis of the main journal is on the plane S2;

[0007] The plane S1 intersects the plane S2 to form an acute angle region β facing the cylinder body; the point where the bearing push bolt mechanism acts on the crankshaft bearing falls within the region β;

[0008] The bearing push bolt mechanism always applies a force to the crankshaft bearing in a direction away from the piston.

[0009] Further preferably, the bearing push bolt mechanism includes a push bolt ejector pin, a mounting hole is opened on the box wall of the box body, the mounting hole falls into the area β, and the push bolt ejector pin penetrates the mounting hole and acts on the crankshaft bearing.

[0010] Further preferably, the bearing push bolt mechanism further includes:

[0011] a bolt pusher bracket, the bolt pusher bracket being mounted on the outer wall of the box body and being placed in the area β; and

[0012] A push bolt sleeve, the push bolt sleeve is connected to the push bolt bracket, and the push bolt sleeve is inserted into the mounting hole;

[0013] Wherein, the push bolt ejector pin is inserted into the push bolt sleeve, and one end of the push bolt ejector pin extends out of the outside of the push bolt sleeve and abuts against the edge of the crankshaft bearing.

[0014] Further preferably, a push bolt spring is provided in the push bolt sleeve, one end of the push bolt spring abuts against the push bolt ejector pin, and the other end abuts against the push bolt sleeve.

[0015] Further preferably, the end of the push bolt ejector pin extending out of the outside of the push bolt sleeve is provided with an abutment surface that cooperates with the edge of the crankshaft bearing, and the abutment surface abuts against the edge of the crankshaft bearing to apply a force to the crankshaft bearing in the direction away from the piston.

[0016] Further preferably, the abutting surface is an arcuate surface that fits with the edge of the crankshaft bearing.

[0017] Further preferably, a first screw hole is provided on the outer wall of the box body, the first screw hole is provided on one side of the radial direction of the mounting hole, a second screw hole corresponding to the first screw hole is provided on the push bolt bracket, and the push bolt bracket is threadedly connected to the box body.

[0018] Further preferably, the push bolt spring is fixedly connected to the push bolt ejector pin and the push bolt sleeve respectively.

[0019] Compared with the prior art, the noise reduction engine structure provided by the present invention has the following beneficial effects:

[0020] The present invention utilizes a bearing push bolt mechanism to provide a force for the crankshaft bearing in the direction opposite to the piston. When the piston moves upward, a gap can be avoided between the crankshaft bearing and the bearing seat, thereby avoiding the impact sound generated by the crankshaft bearing and the bearing seat when the piston explodes downward, thereby achieving the effect of improving engine noise and increasing the life of parts, and at the same time, it can also play a role in suppressing axial and radial movement of the crankshaft; secondly, the bearing push bolt mechanism is set within the range of area β, which just corresponds to the ignition advance angle of the engine, which can play a good noise reduction role and further improve the engine noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a side view of the noise reduction engine structure of the present invention.

[0022] Figure 2 This invention Figure 1 Cross-sectional view of the S1 plane.

[0023] Figure 3 It is an assembly diagram of the bearing push bolt mechanism and the bearing of the present invention.

[0024] Figure 4 It is a structural schematic diagram of the bearing push bolt mechanism of the present invention.

[0025] In the figure, 100, engine body; 11, casing; 12, crankshaft; 13, oil pump; 14, cylinder block; 15, piston; 16, bearing push bolt mechanism; 17, bearing seat; 18, crankshaft bearing; 161, push bolt bracket; 162, push bolt sleeve; 163, push bolt ejector pin; 164, push bolt spring. DETAILED DESCRIPTION

[0026] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside (side)", "outside (side)", "one side (end)", "between", "intersecting", "toward", "opposite", "backward" and the like used in the present invention to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0028] Furthermore, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0029] like Figure 1 As shown, the engine body 100 of this embodiment includes a housing 11, a crankshaft 12, a cylinder block 14, a piston 15 and an oil pump 13, wherein a bearing seat 17 is provided in the housing 11, and the crankshaft 12 is connected to the bearing seat 17 through a crankshaft bearing 18.

[0030] like Figure 1 As shown, in this embodiment, a bearing push bolt mechanism 16 acting on the crankshaft bearing 18 is installed on the housing 11. The bearing push bolt mechanism 16 always applies a force to the crankshaft bearing 18 in the direction away from the piston 15. When the piston 15 moves upward, a gap can be avoided between the crankshaft bearing 18 and the bearing seat 17, thereby avoiding the impact sound generated by the crankshaft bearing 18 and the bearing seat 17 when the piston 15 explodes downward, thereby achieving the effect of improving engine noise and increasing the life of parts, and also playing a role in suppressing axial and radial movement of the crankshaft.

[0031] In the specific implementation of the present invention, please combine Figure 1-3In order to avoid the impact sound of the crankshaft bearing on the bearing seat due to the gap between the crankshaft bearing and the bearing seat when the piston explodes and moves downward, it is necessary to make the main journal axis of the crankshaft 12 and the axis of the piston 15 perpendicular to each other, and the two straight lines are on the same plane S1. The side of the oil pump 13 close to the cylinder body 14 forms a plane S2, and the main journal axis is on the plane S2. The intersection of plane S1 and plane S2 forms an acute angle area β facing the cylinder body 14, and the point of action of the bearing push bolt mechanism 16 on the crankshaft bearing 18 falls into the area β. Due to the arrangement of the oil pump 13, the box wall thickness of the box body 11 in the area β is relatively large. Therefore, placing the bearing push bolt mechanism 16 in this area can play a good protective role and effectively avoid This prevents the bearing push bolt mechanism 16 from being deformed or damaged due to excessive radial stress, thereby extending the service life of the bearing push bolt mechanism 16. Secondly, within the area β, the force exerted by the bearing push bolt mechanism 16 on the crankshaft bearing 18 is basically opposite to the direction when the piston moves upward. Therefore, within this area, the force exerted by the bearing push bolt mechanism 16 on the crankshaft bearing 18 in the direction away from the piston 15 can reach a maximum, while suppressing the axial and radial movement of the crankshaft 12, it can also effectively avoid the formation of a gap between the crankshaft bearing 18 and the bearing seat 17, thereby improving the engine noise; furthermore, setting the bearing push bolt mechanism within the range of area β just corresponds to the ignition advance angle of the engine, which can play a good noise reduction role.

[0032] Specifically, see Figure 2 When the piston 15 moves upward, the crankshaft bearing 18 will be driven by the piston 15 to approach point A of the bearing seat 17, thereby causing a gap to be generated at point B between the crankshaft bearing 18 and the bearing seat 17. However, the bearing push bolt mechanism 16 provided in the region β of this embodiment applies a force to the crankshaft bearing 18 in the direction opposite to the piston 15. Even when the piston 15 moves upward, no gap will be formed between the crankshaft bearing 18 and the bearing seat 17 at point B, thereby avoiding the impact sound generated by the crankshaft bearing 18 and the bearing seat 17 when the piston 15 explodes downward, thereby achieving the effect of improving engine noise and increasing the life of parts, and at the same time, it can also play a role in suppressing axial and radial movement of the crankshaft 12.

[0033] In some examples of the present invention, reference Figure 1 and Figure 4 The bearing push bolt mechanism 16 includes a push bolt ejector pin 163, which penetrates the mounting hole and acts on the crankshaft bearing 18. A mounting hole (not shown) is opened on the box wall of the box body 11, and the mounting hole falls into the area β, so that the bearing push bolt mechanism 16 can be in this area after installation to apply the maximum force in the direction opposite to the piston to the crankshaft bearing 18, thereby avoiding the impact sound caused by the gap between the crankshaft bearing 18 and the bearing seat 17.

[0034] like Figure 2 、 Figure 3 as well as Figure 4 As shown, the bearing push bolt mechanism 16 also includes a push bolt bracket 161 and a push bolt sleeve 162. The push bolt bracket 161 is installed on the outer wall of the box body 11, and the push bolt bracket 161 is placed in the area β. The push bolt sleeve 162 is connected to the push bolt bracket 161, and the push bolt sleeve 162 is passed through the mounting hole, wherein the push bolt push pin 163 is passed through the push bolt sleeve 162, and one end of the push bolt push pin 163 extends outward from the push bolt sleeve 162 and abuts against the edge of the crankshaft bearing; when the piston 15 moves upward, the push bolt push pin 163 applies a force in the direction opposite to the piston to the crankshaft bearing 18, and this force can generate radial and axial component forces along the crankshaft bearing 18. On the one hand, the radial component force and the upward movement of the piston 15 , so that no gap is formed between the crankshaft bearing 18 and the bearing seat 17 at point B, and the push bolt push pin 163 always abuts against the edge of the crankshaft bearing 18. Since the push bolt push pin 163 falls into the area β, when the piston 15 moves upward, the push bolt push pin 163 always applies a force in the direction opposite to the piston, thereby avoiding the crankshaft bearing 18 and the bearing seat 17 from fitting at point A, and further avoiding the impact sound caused by the gap between the crankshaft bearing 18 and the bearing seat 17 at point B when the piston 15 explodes downward, thereby achieving the effect of improving engine noise and increasing component life; on the other hand, the axial component force presses the crankshaft bearing 18, thereby limiting the axial movement of the crankshaft 12.

[0035] like Figure 4 As shown, in some examples of the present invention, in order to ensure that the push bolt push pin 163 can always abut against the edge of the crankshaft bearing 18, a push bolt spring 164 is provided in the push bolt sleeve 162, and one end of the push bolt spring 164 abuts against the push bolt push pin 163, and the other end abuts against the push bolt sleeve 162. Under the action of the push bolt spring 164, the push bolt push pin 163 always extends outward and abuts against the edge of the crankshaft bearing 18, thereby ensuring that the push bolt push pin 163 can abut against the crankshaft bearing 18 at any time point, thereby achieving the effect of improving engine noise.

[0036] As a preferred embodiment, in order to satisfy the requirement that the push pin 163 can suppress the axial and radial movement of the crankshaft 12, and also avoid the gap between the crankshaft bearing 18 and the bearing seat 17, as shown in FIG. Figure 4As shown, an abutment surface that cooperates with the edge of the crankshaft bearing 18 is provided at one end of the push bolt pin 163 extending outward from the push bolt sleeve 162, so that the abutment surface abuts against the edge of the crankshaft bearing 18 to apply a force in the direction opposite to the piston to the crankshaft bearing 18. The abutment surface acts on the chamfer of the edge of the crankshaft bearing 18. The abutment surface can be an inclined surface or an arc-shaped surface. Further preferably, since the inclined surface is point-connected to the edge of the crankshaft bearing 18, during the upward movement of the piston, the instantaneous force of the crankshaft bearing 18 on the push bolt pin 163 is very large, which can easily cause mechanical damage to the push bolt pin 163. The abutment surface adopts an arc-shaped surface, which can form surface contact with the edge of the crankshaft bearing 18, has a large contact area, and a longer service life.

[0037] In other examples of the present invention, since the crankshaft bearing 18 will also generate a reaction force on the push bolt pin 163, in order to prevent the push bolt pin 163 from falling under the reaction force, the push bolt spring 164 needs to be fixedly connected to the push bolt pin 163 and the push bolt sleeve 162 respectively, so that even if the push bolt pin 163 falls off, other parts inside the engine will not be damaged.

[0038] In other examples of the present invention, reference Figure 1 A first screw hole is provided on the outer wall of the box body 11, and a second screw hole corresponding to the first screw hole is opened on the push bolt bracket 161. The push bolt bracket 161 is threadedly connected to the box body 11. The threaded connection is convenient for disassembly and assembly, which is beneficial to the subsequent cleaning, maintenance and replacement of the bearing push bolt mechanism 16.

[0039] The working process of the present invention is: Figure 2 , because when the piston 15 moves upward, the crankshaft bearing 18 will approach point A under the drive of the piston 15, thereby causing a gap to be generated at the position of point B. Therefore, the corresponding mounting hole of the bearing push bolt mechanism 16 is fixed in area β. At this time, the push bolt push pin 163 always applies a force in the direction opposite to the piston to the crankshaft bearing 18 under the action of the push bolt spring 164. When the piston 15 moves upward, the push bolt push pin 163 always applies a force in the direction opposite to the piston to the crankshaft bearing 18. Therefore, no gap will be formed at point B between the crankshaft bearing 18 and the bearing seat 17, thereby avoiding the impact sound generated by the crankshaft bearing 18 and the bearing seat 17 when the piston 15 explodes downward, thereby reducing the noise generated by the engine.

[0040] In summary, an embodiment of the present invention provides a noise reduction engine structure, which utilizes a bearing push bolt mechanism to provide a larger force in the direction opposite to the piston for the crankshaft bearing, so that when the piston moves upward, a gap can be avoided between the crankshaft bearing and the bearing seat. Specifically, planes S1 and S2 are utilized to form an acute angle region β facing the cylinder body, and the bearing push bolt mechanism is arranged in this region and acts on the crankshaft bearing. When the piston moves upward, the bearing push bolt mechanism exerts a force in the direction opposite to the piston on the crankshaft bearing, so that no gap is formed between the crankshaft bearing and the bearing seat, thereby eliminating the impact sound generated by the crankshaft bearing and the bearing seat when the piston explodes downward, thereby achieving the effect of improving engine noise and increasing the life of parts, and at the same time, it can also play a role in suppressing axial and radial movement of the crankshaft.

[0041] The above description is only a preferred embodiment of the present invention. It should be noted that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be considered as the scope of protection of the present invention. The basic principles, main features and advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above preferred embodiments. The examples should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0042] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A noise reduction engine structure, comprising an engine body, the engine body comprising a housing, a crankshaft, a cylinder, a piston, and an oil pump, a bearing seat being provided in the housing, the crankshaft and the bearing seat being connected via a crankshaft bearing, characterized in that: The box body is provided with a bearing push bolt mechanism acting on the crankshaft bearing; The main journal axis of the crankshaft and the axis of the piston are perpendicular to each other, and the two straight lines are on the same plane S1; A plane S2 is formed on the side of the oil pump close to the cylinder body, and the axis of the main journal is on the plane S2; The plane S1 intersects the plane S2 to form an acute angle region β facing the cylinder body; the point where the bearing push bolt mechanism acts on the crankshaft bearing falls within the region β; The bearing push bolt mechanism always applies a force to the crankshaft bearing in a direction away from the piston.

2. A noise reduction engine structure according to claim 1, characterized in that: The bearing push bolt mechanism includes a push bolt ejector pin. A mounting hole is opened on the box wall of the box body. The mounting hole falls into the area β. The push bolt ejector pin penetrates the mounting hole and acts on the crankshaft bearing.

3. A noise reduction engine structure according to claim 2, characterized in that: The bearing push bolt mechanism also includes: a bolt pusher bracket, the bolt pusher bracket being mounted on the outer wall of the box body and being placed in the area β; and A push bolt sleeve, the push bolt sleeve is connected to the push bolt bracket, and the push bolt sleeve is inserted into the mounting hole; Wherein, the push bolt ejector pin is inserted into the push bolt sleeve, and one end of the push bolt ejector pin extends out of the outside of the push bolt sleeve and abuts against the edge of the crankshaft bearing.

4. The noise reduction engine structure according to claim 3, characterized in that: A push bolt spring is provided in the push bolt sleeve, one end of the push bolt spring abuts against the push bolt ejector pin, and the other end abuts against the push bolt sleeve.

5. The noise reduction engine structure according to claim 3, characterized in that: The end of the push bolt ejector pin extending outward from the push bolt sleeve is provided with an abutment surface cooperating with the edge of the crankshaft bearing, and the abutment surface abuts against the edge of the crankshaft bearing to apply a force on the crankshaft bearing in the direction away from the piston.

6. The noise reduction engine structure according to claim 5, characterized in that: The abutting surface is an arc-shaped surface that fits the edge of the crankshaft bearing.

7. The noise reduction engine structure according to claim 3, characterized in that: A first screw hole is provided on the outer wall of the box body, and the first screw hole is provided on one side of the radial direction of the mounting hole. A second screw hole corresponding to the first screw hole is provided on the push bolt bracket, and the push bolt bracket is threadedly connected to the box body.

8. The noise reduction engine structure according to claim 4, characterized in that: The push bolt spring is fixedly connected to the push bolt ejector pin and the push bolt sleeve respectively.

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