Reciprocating piston internal combustion engine

Abstract

According to the reciprocating piston internal combustion engine, an engine body is provided with an air cylinder and an auxiliary inner cavity; one end of the swing lever is pivoted with the piston connecting rod through a tail-end pivot, the other end of the swing lever is pivoted with the machine body through a fulcrum pivot, and the middle of the swing lever is pivoted with the crankshaft connecting rod through a middle pivot; the crankshaft connecting rod and the piston connecting rod are arranged on two sides of the swing lever; the crank balance block is in transmission connection between the crankshaft and the crankshaft connecting rod, so that the rotating circumference diameter is smaller than the piston stroke. Compared with a structure that a piston connecting rod of an existing internal combustion engine is directly connected with a crank balance block, the structure can reduce the compound pendulum amplitude of the piston connecting rod, reduce the lateral pressure of the piston on the cylinder and prolong the service life of the engine.

Description

Technical Field

[0001] This utility model belongs to the field of internal combustion engine structure, specifically relating to a reciprocating piston internal combustion engine. Background Technology

[0002] In existing reciprocating piston internal combustion engines, the crankshaft and piston are directly driven by the piston connecting rod.

[0003] The lever engine disclosed in patent CN109057964A adds a lever and a crankshaft connecting rod between the crankshaft and the piston connecting rod. The two ends of the lever are pivotally connected to the piston connecting rod and the crankshaft connecting rod, and the fulcrum of the lever is installed on the inner wall of the engine body. Utility Model Content

[0004] The technical problem to be solved by this invention is how to improve the crank transmission mechanism of a reciprocating piston internal combustion engine to improve transmission efficiency.

[0005] This utility model discloses a reciprocating piston internal combustion engine. The reciprocating piston internal combustion engine includes an engine body, a portion of which is configured as a cylinder, and a piston is provided in the inner cavity of the cylinder. Under the action of combustion, the piston can reciprocate in the X-axis direction.

[0006] The reciprocating piston internal combustion engine also includes:

[0007] A secondary cavity, formed by the remainder of the body, is parallel to the cylinder cavity in the X-axis direction;

[0008] A piston connecting rod, which is straight, has one end pivotally connected to the piston and the other end located in the secondary cavity;

[0009] A swing lever, basically straight, is located in the secondary cavity. One end is pivotally connected to the piston rod via a terminal pivot, and the other end is pivotally connected to the machine body via a fulcrum pivot.

[0010] A crankshaft connecting rod, in the shape of a straight bar, is positioned on either side of the piston connecting rod on either side of the swing lever. One end is pivotally connected to the middle of the swing lever via a central pivot.

[0011] A crank balance weight is used to fix the crankshaft in place, with one end pivotally connected to the other end of the crankshaft connecting rod;

[0012] In its working state, the piston sequentially drives the piston connecting rod, the swing lever, the crankshaft connecting rod, and the crank balance block. The crank balance block can drive the crankshaft to rotate, and the stroke of the piston is greater than the rotation circumference diameter of the crank balance block.

[0013] In some embodiments of this application, the X-axis direction may be configured as a vertical direction.

[0014] In some embodiments of this application, the swing lever may optionally have a first mounting groove for the piston connecting rod to be inserted and pivoted, and a second mounting groove for the crankshaft connecting rod to be inserted and pivoted.

[0015] In some embodiments of this application, the end pivot may optionally have an arcuate travel of radius R1, and the middle pivot may have an arcuate travel of radius R2, where R2 is 2 / 3 to 3 / 4 times R1.

[0016] The following beneficial effects can be obtained by implementing the technical solution of this utility model.

[0017] In the reciprocating piston internal combustion engine disclosed in this utility model, the engine body is provided with a cylinder and a secondary internal cavity; a swing lever is located in the secondary internal cavity, one end of which is pivotally connected to the piston connecting rod via a terminal pivot, and the other end is pivotally connected to the engine body via a fulcrum pivot, with the middle part pivotally connected to the crankshaft connecting rod via a central pivot; the crankshaft connecting rod and the piston connecting rod are respectively arranged on both sides of the swing lever; a crank balance block is driven between the crankshaft and the crankshaft connecting rod, so that the rotational circumference diameter is smaller than the piston stroke. Compared with the existing internal combustion engine structure where the piston connecting rod is directly connected to the crank balance block, the above structure can reduce the reciprocating amplitude of the piston connecting rod, reduce the side pressure of the piston on the cylinder, and help extend the engine service life. Attached Figure Description

[0018] The accompanying figures should be used in conjunction with the detailed implementation section.

[0019] Figure 1 This is a schematic diagram of a reciprocating piston internal combustion engine according to Embodiment 1, with the piston located at the lowest point of its stroke;

[0020] Figure 2a and Figure 2b All Figure 1 The other two schematic diagrams of the reciprocating piston internal combustion engine show the piston at the highest point of its stroke.

[0021] The labels in the attached diagrams represent:

[0022] 10- Engine body, 10a- Cylinder cavity, 10b- Secondary cavity, 10b1- Bottom oil cavity, 11- Main housing, 12- Oil pan; 20- Piston, 30- Piston connecting rod, 40- Swing lever, 41- Pivot point, 42- Pivot joint, 43- Connecting part, 50- Crankshaft connecting rod, 60- Crankshaft balance block; 81- Piston pivot, 82- End pivot, 83- Middle pivot, 84- Pivot point pivot, 88- Balance block pivot, 91- Crankshaft pin. Detailed Implementation

[0023] The embodiments are described below with reference to the accompanying drawings.

[0024] In this specification, unless otherwise specified, "one embodiment," "some embodiments," and "other embodiments" are used to distinguish different embodiments and do not refer to all embodiments in general; the accompanying drawings are schematic diagrams, not scale diagrams; the directions / positions indicated by top, bottom, center, edge, inner, outer, far, near, long, wide, vertical, horizontal, up, down, front, back, left, right, etc., are based on the viewing angle of the accompanying drawings and should not be interpreted as the component / device being located in a specific position or facing a specific direction; the sequence words such as first, second, third, etc., are used to distinguish components / devices with the same function / name and have no sequential meaning.

[0025] Example 1

[0026] A reciprocating piston internal combustion engine has been disclosed.

[0027] Please see Figure 1 , Figure 2a and Figure 2b The reciprocating piston internal combustion engine includes an engine block 10, a piston 20, a piston connecting rod 30, a swing lever 40, a crankshaft connecting rod 50, and a crankshaft balance block 60.

[0028] The machine body 10 includes a main housing 11 and an oil pan 12 assembled as one piece. The upper part of the main housing 11 is configured as a cylinder, thereby forming a cylinder cavity 10a. That is, a portion of the machine body 10 is configured as a cylinder.

[0029] A piston 20 is provided in the cylinder cavity 10a, and the piston 20 can reciprocate under the action of combustion. Figure 1 The purpose of this illustration is to show the transmission mechanism between piston 20 and crankshaft. Only the cylinder is briefly shown. The double-arrow X-axis represents the reciprocating movement direction of piston 20, and the double-arrow Y-axis is perpendicular to the X-axis.

[0030] The reciprocating piston internal combustion engine is set vertically, meaning the X-axis is vertical and the Y-axis is horizontal.

[0031] The lower part of the main housing 11 and the oil pan 12 together form a secondary inner cavity 10b. The secondary inner cavity 10b is parallel to the cylinder inner cavity 10a along the X-axis. That is, the remaining part of the engine body 10 is the cavity of the secondary inner cavity 10b.

[0032] The secondary cavity 10b is located below the cylinder cavity, corresponding to the crankcase of an existing internal combustion engine. The upper part of the secondary cavity 10b can be called the upper crankcase. The lower part of the secondary cavity 10b can be called the bottom oil cavity 10b1, which is formed by the oil pan 12 (i.e., the lower crankcase).

[0033] The piston connecting rod 30 is straight, with its upper end pivotally connected to the piston 20 via the piston pivot 81, and its lower end extending into the secondary inner cavity 10b. That is, one end of the piston connecting rod 30 is pivotally connected to the piston 20, and the other end is located in the secondary inner cavity 10b.

[0034] The piston pivot 81, as well as the end pivot 82, middle pivot 83, fulcrum pivot 84, counterweight pivot 88 and crankshaft pin 91 described below, can be a single component or belong to one of the two connected components.

[0035] The swing lever 40 is basically straight and is located in the secondary inner cavity 10b.

[0036] The swing lever 40 includes a circular plate-shaped fulcrum portion 41 and a flat plate-shaped pivot portion 42, and also includes a connecting portion 43 connecting the fulcrum portion 41 and the pivot portion 42. Figure 1 From a visual perspective, the connecting portion 43 is the thinnest, meaning its equivalent diameter is the smallest. The fulcrum portion 41 is provided with an extension extending from... Figure 1 A central through hole in the viewing direction. The upper side of the pivot portion 42 has a first mounting groove, the lower side has a second mounting groove, and each end in the long axis direction has a mounting through hole. Both mounting through holes extend into the... Figure 1 Viewing direction. The first mounting slot is for the piston connecting rod 20 to be inserted and pivoted, and the second mounting slot is for the crankshaft connecting rod 50 to be inserted and pivoted.

[0037] A pivot 84 is provided through the central through hole of the pivot part 41, and is pivotally connected to the main housing 11 through the pivot 84, so that the swing lever 40 can swing around the pivot 84 in the secondary inner cavity 10b. That is, one end of the swing lever 40 in the long axis direction is pivotally connected to the body 10 through the pivot 84.

[0038] The outer end of the pivot part 42 is fitted with a through hole through which a terminal pivot 82 is provided, and the lower end of the piston connecting rod 20 is pivotally connected via the terminal pivot 82. That is, the remaining end of the swing lever 40 in the long axis direction is pivotally connected to the swing end of the piston connecting rod 20 via the terminal pivot 82.

[0039] The inner end of the pivot part 42 is fitted with a through hole through which a central pivot 83 is inserted, and the upper end of the crankshaft connecting rod 50 is pivotally connected via the central pivot 83. The crankshaft connecting rod 50 is in the shape of a straight bar.

[0040] The crankshaft connecting rod 50 and the piston connecting rod 30 are positioned on the upper and lower sides of the swing lever 40, respectively. The upper end of the crankshaft connecting rod 50 is inserted into the second mounting groove and is pivotally connected to the middle of the swing lever 40 via the central pivot 83. That is, the crankshaft connecting rod 50 is located on the lower side of the swing connecting rod 40 and is pivotally connected to the middle of the swing lever 40 at one end.

[0041] One end of the crankshaft balance weight 60 is provided with an extension to Figure 1 A mounting through hole is provided in the viewing direction. A balance block pivot 88 passes through this mounting through hole. This end of the crankshaft balance block 60 is pivotally connected to the lower end of the crankshaft connecting rod 50 via the balance block pivot 88. That is, the crank balance block 60 is pivotally connected to the lower end of the crankshaft connecting rod 50 at one end.

[0042] The crankshaft balance weight 60 is used to fix it to the crankshaft via the crankshaft pin 91. The crankshaft is part of the drive shaft.

[0043] In the operating state of this reciprocating piston internal combustion engine, the piston 20, during its reciprocating movement, sequentially drives the piston connecting rod 30, the swing lever 40, the crankshaft connecting rod 50, and the crank balance block 60. The crank balance block 60 can drive the crankshaft to rotate counterclockwise. The end pivot 82 has an arc-shaped stroke with a radius of R1, and the middle pivot 83 has an arc-shaped stroke with a radius of R2. ２ / R １ =0.75.

[0044] The piston's stroke is greater than the diameter of the crank balance block's rotation circle (i.e., 2r). The chord length of the arc stroke of the end pivot 82 is equal to the piston 20's stroke L. The chord length of the arc stroke of the middle pivot 83 is equal to the diameter of the crank balance block 60's rotation circle (i.e., 2r).

[0045] Compared to the existing internal combustion engine structure where the piston connecting rod is directly connected to the crankshaft balance block, the above structure can reduce the re-oscillation amplitude of the piston connecting rod, reduce the side pressure of the piston on the cylinder, and help extend the engine's service life. Specifically, the arc stroke radius of the end pivot 82 is larger than that of the middle pivot 83. Under the same output power, the swing range of the piston connecting rod in the second direction is smaller than that when directly connected to the crankshaft, so the friction between the cylinder and the piston is smaller.

[0046] In other embodiments, R ２ / R １ Values ​​equal to 0.50, 0.55, 0.60, 0.63, 0.66, 0.68, 0.70, 0.72, 0.74, 0.77, or 0.80 are preferred for R. ２ / R １ =2 / 3 to 3 / 4. R ２ / R １ If it is too large, the leverage effect will be low; if it is too small, it will be difficult to match the existing crankshaft.

[0047] In other embodiments, the reciprocating piston internal combustion engine may be arranged horizontally or obliquely, i.e., the X-axis is horizontal or oblique, but the oil pan 12 must be located at the lowest point.

[0048] The above embodiments, application examples, and technical analyses are intended to introduce the technical concept and features of this utility model, enabling those skilled in the art to implement the technical solution of this utility model, and do not constitute any limitation on the protection scope of this utility model. Simple modifications and equivalent transformations to the above embodiments are all within the protection scope of this utility model.

Claims

1. A reciprocating piston internal combustion engine, comprising an engine block, a portion of which is configured as a cylinder, and a piston is provided in the cylinder cavity, wherein the piston can reciprocate in the X-axis direction under combustion action; Its features Also includes: A secondary cavity, formed by the remainder of the body, is parallel to the cylinder cavity in the X-axis direction; A piston connecting rod, which is straight, has one end pivotally connected to the piston and the other end located in the secondary cavity; A swing lever, basically straight, is located in the secondary cavity. One end is pivotally connected to the piston rod via a terminal pivot, and the other end is pivotally connected to the machine body via a fulcrum pivot. A crankshaft connecting rod, in the shape of a straight bar, is positioned on either side of the piston connecting rod on either side of the swing lever. One end is pivotally connected to the middle of the swing lever via a central pivot. A crank balance weight is used to fix the crankshaft in place, with one end pivotally connected to the other end of the crankshaft connecting rod; In its working state, the piston sequentially drives the piston connecting rod, the swing lever, the crankshaft connecting rod, and the crank balance block. The crank balance block can drive the crankshaft to rotate, and the stroke of the piston is greater than the rotation circumference diameter of the crank balance block.

2. The reciprocating piston internal combustion engine according to claim 1, characterized in that, The X-axis direction is configured as a vertical direction.

3. The reciprocating piston internal combustion engine according to claim 1, characterized in that, The swing lever has a first mounting groove for the piston connecting rod to be inserted and pivoted, and a second mounting groove for the crankshaft connecting rod to be inserted and pivoted.

4. A reciprocating piston internal combustion engine according to claim 1, characterized in that, The end pivot has an arc-shaped travel of radius R1, and the middle pivot has an arc-shaped travel of radius R2, where R2 is 2 / 3 to 3 / 4 times R1.

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