Self-adaptive height piston

Abstract

The invention discloses a self-adaptive height piston, and relates to the technical field of engine pistons, the self-adaptive height piston comprises a piston top and a piston skirt, a butt joint shaft extends from one side, opposite to the piston part, of the piston top, a positioning section is arranged at the end, close to the piston skirt, of the butt joint shaft, and the butt joint shaft can be matched with the end face of the piston skirt. The butt joint shaft is connected with the positioning section through the butt joint shaft, the positioning section extends into the piston skirt portion, the butt joint shaft can axially slide in the end face of the piston skirt portion, a locking piece is detachably arranged on the periphery of the positioning section, and the locking piece is used for limiting relative displacement between the piston skirt portion and the piston top. The piston is prevented from driving the crankshaft to move, so that the net power of the engine is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine piston, in particular to a self-adaptive height piston. BACKGROUND

[0002] The four-stroke engine commonly used in internal combustion engine, intake stroke-compression stroke-power stroke-exhaust stroke, in addition to the power stroke, the other three strokes do negative work. In the intake stroke, the piston moves upward to expand the space in the cylinder, so that the gas pressure in the cylinder is smaller, and the negative pressure formed generates a certain pulling force on the piston. In the exhaust stroke and compression stroke, the piston moves downward to compress the gas in the cylinder, so that the gas pressure in the cylinder is larger, and the pressure formed in the cylinder holds the piston to prevent the piston from moving further downward. The intake stroke, exhaust stroke and compression stroke of the piston all cause changes in the gas pressure in the cylinder, and the stress generated in the process is opposite to the direction of movement of the piston, which hinders the movement of the piston, thereby increasing the energy consumed by the three strokes and reducing the output efficiency of the engine.

[0003] From the above, it is urgent for those skilled in the art to develop a piston that can compensate for the changes in gas pressure during the intake stroke, exhaust stroke and compression stroke to improve the output efficiency of the engine. SUMMARY

[0004] The purpose of the present application is to provide a self-adaptive height piston to solve the technical problem that the change in gas pressure during the intake stroke, exhaust stroke and compression stroke of the engine hinders the movement of the piston and reduces the output power of the engine.

[0005] To achieve the above-mentioned purpose, the present application provides a self-adaptive height piston, comprising:

[0006] The piston top and the piston skirt, the opposite side of the piston top and the piston skirt extends a butt joint shaft, the end of the butt joint shaft close to the piston skirt is provided with a positioning section, the butt joint shaft can cooperate with the end face of the piston skirt, so that the positioning section extends into the piston skirt, and the butt joint shaft can slide axially in the end face of the piston skirt, and the outer periphery of the positioning section is detachably provided with a locking piece, which is used to limit the relative displacement between the piston skirt and the piston top.

[0007] Preferably, the end faces of the piston top and the piston skirt are respectively provided with a butt joint groove and a butt joint boss, when the positioning section extends into the piston skirt, the butt joint boss extends into the butt joint groove, the butt joint boss is provided with a butt joint hole, the butt joint shaft is arranged in the butt joint hole, and the butt joint groove, the butt joint boss, the butt joint hole and the butt joint shaft together limit the relative movement direction of the piston skirt and the piston top.

[0008] Preferably, the groove depth of the abutment groove is greater than the length of the abutment boss, a cavity is formed between the abutment groove and the abutment boss after the piston top and the piston skirt are completely abutted, the cavity is provided with an elastic member, the elastic member is sleeved on the outer periphery of the abutment shaft, and the elastic member is connected with the piston top and the piston skirt respectively.

[0009] Preferably, the connecting part of the abutment shaft and the positioning section is provided with a mounting groove, the mounting groove is a ring groove and is coaxially arranged with the abutment shaft, the mounting groove is used for clamping a check ring, and the check ring is used to prevent the locking member from being separated.

[0010] Preferably, the port edge of the abutment groove, the top edge of the abutment boss, and the connecting edge of the abutment boss and the piston skirt are all provided with chamfers.

[0011] Preferably, the outer wall of the piston top is provided with a plurality of sealing grooves, each sealing groove is used for arranging a sealing ring, and each sealing ring abuts against the inner wall of the cylinder sleeve, so that the piston top and the cylinder sleeve form a sealed chamber.

[0012] Preferably, the outer walls of the abutment shaft and the abutment boss are both provided with oil storage grooves, and each oil storage groove is filled with lubricating grease.

[0013] Preferably, the width of the check ring is greater than the depth of the mounting groove, so that the outer edge of the check ring extends out of the mounting groove, when the piston top and the piston skirt move to the maximum distance in the direction away from each other, the check ring is clamped between the locking member and the end surface of the piston skirt, and the check ring is used to buffer the impact between the locking member and the piston skirt.

[0014] Preferably, the outer periphery of the positioning section is provided with threads, the locking member is a nut, and the positioning section is threadedly connected with the locking member.

[0015] Preferably, the piston top, the piston skirt, the abutment shaft, and the abutment hole are coaxially arranged.

[0016] In the light of the prior art, the adaptive height piston provided by the present application comprises a piston top and a piston skirt, a butt joint shaft is extended on the side wall of the piston top and the piston skirt opposite to each other, the end faces of the piston top and the piston skirt can be attached to each other, the butt joint shaft passes through the end face of the piston skirt, and the butt joint shaft can slide in the end face of the piston skirt, a positioning section is arranged at the end of the butt joint shaft, the positioning section passes through the end face of the piston skirt together with the butt joint shaft, is located in the inner cavity of the piston skirt, and a locking piece is detachably arranged on the outer periphery of the positioning section, when the butt joint shaft slides in the piston skirt by a certain distance, the locking piece abuts against the end face of the inner cavity of the piston skirt, so as to limit the relative sliding distance between the piston skirt and the piston top, when the present application is in the intake stroke in the cylinder sleeve, the adaptive height piston moves downward in the cylinder sleeve, the adaptive height piston reduces the air pressure in the cylinder sleeve, a negative pressure is formed to pull the piston top to hinder the piston top from moving downward, at the same time, the pulling force generated by the negative pressure makes the piston top move upward, so as to reduce the size of the inner cavity of the cylinder sleeve, to a certain extent, the air negative pressure in the cylinder and the resistance received by the adaptive height piston in the intake process are reduced, when the adaptive height piston is in the exhaust stroke and the compression stroke in the cylinder sleeve, the adaptive height piston compresses the air in the cylinder, the high pressure gas generated by the compression hinders the adaptive height piston from moving upward, at the same time, the high pressure gas holds the piston skirt downward, so as to increase the space in the cylinder sleeve, to reduce the resistance generated by the air pressure in the exhaust stroke and the compression stroke.

[0017] The present application sets the piston skirt and the piston top as components capable of sliding relative to each other, so as to relieve the resistance of the piston caused by the air pressure change in the intake stroke, the exhaust stroke and the compression stroke, to improve the output efficiency of the engine. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by the drawings provided by the person skilled in the art without any creative effort.

[0019] Figure 1 The cross-sectional view of the adaptive height piston provided by the embodiment of the present application;

[0020] Figure 2 The cross-sectional view of the adaptive height piston in the intake stroke state provided by the embodiment of the present application;

[0021] Figure 3 The cross-sectional view of the adaptive height piston in the exhaust stroke and the compression stroke provided by the embodiment of the present application.

[0022] Wherein, 1-piston top; 11-abutment groove; 12-abutment shaft; 13-mounting groove; 2-piston skirt; 21-abutment boss; 22-abutment hole; 3-locking piece; 4-retainer; 5-sealing groove; 6-elastic piece. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without any creative work fall within the protection scope of the present application.

[0024] In order for those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0025] The present application provides a self-adaptive height piston, please refer to the drawings of the specification Figure 1 With the drawings Figure 2 The self-adaptive height piston comprises a piston top 1 and a piston skirt 2, an abutment shaft 12 extends on the side wall opposite to the piston top 1 and the piston skirt 2, the end faces of the piston top 1 and the piston skirt 2 can be mutually attached, the abutment shaft 12 on the piston top 1 passes through the end face of the piston skirt 2, and the abutment shaft 12 can slide in the end face of the piston skirt 2, a positioning section is arranged at one end of the abutment shaft 12 close to the piston skirt 2, the positioning section passes through the end face of the piston skirt 2 together with the abutment shaft 12, so that it is located in the inner cavity of the piston skirt 2, and a locking piece 3 is detachably arranged on the outer periphery of the positioning section, when the abutment shaft 12 slides a certain distance in the piston skirt 2, the locking piece 3 abuts against the end face of the inner cavity of the piston skirt 2, the locking piece 3 connects the piston skirt 2 and the piston top 1 and limits the relative sliding distance between the two.

[0026] When the engine of the application is running, the intake stroke of the engine makes the adaptive height piston (referred to as the adjusting piston) move downward, and at the beginning of the intake stroke, the adjusting piston is located at the top of the cylinder sleeve, at which time the cylinder is at normal air pressure, and the piston top 1 slides downward under the influence of its own gravity and is attached to the end face of the piston skirt 2. Subsequently, the adjusting piston sucks in external gas during the downward movement, the space in the cylinder sleeve cavity increases, and the negative pressure formed exerts a pulling force on the adjusting piston, causing the piston top 1 to move upward, thereby reducing the negative pressure in the cavity and reducing the resistance of the adjusting piston. When the engine performs the exhaust stroke and the compression stroke, the adjusting piston moves upward, and in this process, the gas in the cylinder sleeve is compressed, and the high-pressure gas exerts a pushing force on the piston top 1 to prevent the piston from moving upward. At the same time, the pushing force of the high-pressure gas makes the piston top 1 move downward, increases the space in the cylinder sleeve cavity, and reduces the air pressure to a certain extent, thereby reducing the pushing force on the adjusting piston. The present application sets the piston top 1 and the piston skirt 2 as two parts that can move axially relative to each other, so that the adjusting piston can adjust the overall height after being affected by the change in air pressure, thereby relieving the resistance generated after the change in cavity volume, and improving the output efficiency of the engine.

[0027] Please continue to refer to the description of the drawings Figure 1 The end faces of the piston top 1 and the piston skirt 2 are respectively provided with a butt joint groove 11 and a butt joint boss 21, which can be fitted with each other. Preferably, the butt joint shaft 12 is arranged on the bottom surface of the butt joint groove 11, and the butt joint groove 11 and the butt joint shaft 12 are coaxially arranged. Correspondingly, the butt joint boss 21 is arranged on the upper end face of the piston skirt 2, and a butt joint hole 22 is arranged along the height direction of the butt joint boss 21, which extends to the inner cavity of the piston skirt 2 and is coaxially arranged with the piston skirt 2. Preferably, the length of the butt joint shaft 12 is greater than the depth of the butt joint hole 22, and when the piston top 1 and the piston skirt 2 are matched, the positioning section at the end of the butt joint shaft 12 protrudes from the lower port of the butt joint hole 22, so that the positioning section has enough space to arrange the locking member 3. Further, the diameters of the butt joint groove 11 and the butt joint boss 21, and the butt joint shaft 12 and the butt joint hole 22 are the same. After the piston top 1 and the piston skirt 2 are butted, the side walls of the butt joint groove 11 and the butt joint boss 21, and the butt joint shaft 12 and the butt joint hole 22 are attached to each other. The above components limit the radial freedom of the piston top 1 and the piston skirt 2, and also limit the sliding direction of the piston top 1 and the piston skirt 2.

[0028] Preferably, the groove depth of the docking groove 11 is greater than the height of the docking boss 21, when the piston top 1 and the piston skirt 2 are mutually docked, the docking boss 21 is fully inserted into the docking groove 11, the bottom surface of the docking groove 11 is spaced from the top of the docking boss 21, that is, the two form a cavity, preferably, the cavity is provided with an elastic element 6, the elastic element 6 is sleeved on the outer periphery of the docking shaft 12 and coaxially arranged, the length of the elastic element 6 in the natural state is greater than the height of the cavity after the docking groove 11 and the docking boss 21 are fully docked, the elastic element 6 lifts the piston top 1 by a distance, in the intake stroke of the engine, the negative pressure gas formed forms a negative pressure gas and pulls the piston top 1, the elastic element 6 is stretched, when the adjusting piston moves to the lowest end of the cylinder liner, the air fills the cavity, the elastic element 6 resets the piston top 1, in the subsequent compression and exhaust strokes, the adjusting piston moves upward, the high-pressure air formed by compression exerts a thrust force on the piston top 1, the piston top 1 slides downward, at the same time, the elastic element 6 is compressed, the elastic element 6 lifts the piston top 1 by a distance, so that the piston top 1 has enough distance to move downward in the compression and exhaust strokes, preventing the piston top 1 from falling onto the top surface of the piston skirt 2, without additional space to relieve the pressure exerted by the air, in addition, the elastic element 6 makes the relative movement between the piston top 1 and the piston skirt 2 more gentle, avoiding collision between the piston top 1 and the piston skirt 2, causing damage to the parts.

[0029] Further, in the case of full docking of the docking groove 11 and the docking boss 21, the distance between the locking element 3 on the positioning section and the end face of the inner cavity of the piston skirt 2 is less than the height of the docking boss 21, if the distance is greater than the height of the boss, the piston top 1 and the piston skirt 2 may be separated from the docking groove 11 after relative movement, and knocking may occur when the docking boss 21 and the docking groove 11 are matched.

[0030] Preferably, an installation groove 13 is arranged at the connection between the docking shaft 12 and the positioning section, the installation groove 13 is a ring groove and is coaxially arranged with the docking shaft 12, the installation groove 13 is used to clamp the check ring 4, the check ring 4 is made of carbon spring steel, in addition, the width of the check ring 4 is greater than the depth of the installation groove 13, after the check ring 4 is clamped into the installation groove 13, the outer edge portion of the check ring 4 extends to the outside of the installation groove 13, preferably, the positioning section is a threaded section, the locking element 3 is a nut, the locking element 3 is threadedly connected to the outer periphery of the positioning section, during installation of the locking element 3, it is continuously screwed, after the locking element 3 and the check ring abut, it is further screwed to increase the pressure between the locking element 3 and the check ring 4, which makes the connection between the locking element 3 and the positioning section firm, in addition, the check ring 4 is also used to slow down the impact between the locking element 3 and the inner wall of the piston skirt 2, preventing damage to the parts.

[0031] Preferably, the port edge of the docking groove 11, the top edge of the docking boss 21, and the connecting edge of the docking boss 21 and the piston skirt 2 are each provided with a chamfer, and each chamfer is specifically a round chamfer. The chamfer makes the docking process of the docking groove 11 and the docking boss 21 more gentle, and the stress distribution at the edge of the component is uniform, thereby improving the mechanical strength of the component.

[0032] Please refer to the accompanying drawings Figure 2 A plurality of sealing grooves 5 are arranged on the outer wall of the piston top 1, and each sealing groove 5 is used to arrange a sealing ring. Each sealing ring abuts against the inner wall of the cylinder sleeve, so that the piston top 1 and the cylinder sleeve form a sealed chamber. In addition, the docking shaft 12 and the outer wall of the docking boss 21 are each provided with an oil storage groove, and each oil storage groove is filled with lubricating grease. The lubricating oil is used to reduce the friction between the piston top 1 and the piston skirt 2, and to reduce the mechanical loss of the components.

[0033] In the present application, the piston skirt and the piston top are arranged as components capable of sliding relative to each other, so that the piston skirt can relieve the resistance of the present application caused by the change of air pressure in the intake stroke, the exhaust stroke, and the compression stroke, thereby improving the output efficiency of the engine.

[0034] It should be noted that in the present specification, the relationship terms such as first and second are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between the entities.

[0035] The principles and implementation modes of the present application are described by using specific examples in the present specification, and the above description of the examples is only used to help understand the method of the present application and its core idea. It should be pointed out that, for those skilled in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. An adaptive height piston, characterized in that, include: A piston top (1) and a piston skirt (2) are provided. A docking shaft (12) extends from the side of the piston top (1) opposite to the piston skirt (2). A positioning section is provided at the end of the docking shaft (12) near the piston skirt (2). The docking shaft (12) can cooperate with the end face of the piston skirt (2) so that the positioning section extends into the piston skirt (2). The docking shaft (12) can slide axially within the end face of the piston skirt (2). A locking member (3) is detachably provided on the outer periphery of the positioning section. The locking member (3) is used to limit the relative displacement between the piston skirt (2) and the piston top (1).

2. The adaptive height piston according to claim 1, characterized in that, The piston top (1) and the piston skirt (2) are respectively provided with a docking groove (11) and a docking boss (21) on their opposite end faces. When the positioning section extends into the piston skirt (2), the docking boss (21) extends into the docking groove (11). The docking boss (21) is provided with a docking hole (22). The docking shaft (12) passes through the docking hole (22). The docking groove (11), the docking boss (21), the docking hole (22), and the docking shaft (12) together define the relative movement direction of the piston skirt (2) and the piston top (1).

3. The adaptive height piston according to claim 2, characterized in that, The depth of the docking groove (11) is greater than the length of the docking boss (21). After the piston top (1) and the piston skirt (2) are fully docked, a cavity is formed between the docking groove (11) and the docking boss (21). An elastic element (6) is provided in the cavity. The elastic element (6) is sleeved on the outer periphery of the docking shaft (12), and the elastic element (6) is connected to the piston top (1) and the piston skirt (2) respectively.

4. The adaptive height piston according to claim 3, characterized in that, The connection between the docking shaft (12) and the positioning section is provided with an installation groove (13). The installation groove (13) is a ring groove and is coaxially arranged with the docking shaft (12). The installation groove (13) is used to engage the retaining ring (4). The retaining ring (4) is used to prevent the locking member (3) from disengaging.

5. The adaptive height piston according to claim 4, characterized in that, The port edge of the docking groove (11), the top edge of the docking boss (21), and the connecting edge between the docking boss (21) and the piston skirt (2) are all chamfered.

6. The adaptive height piston according to claim 5, characterized in that, The outer wall of the piston top (1) is provided with several sealing grooves (5), and each sealing groove (5) is used to set a sealing ring. Each sealing ring abuts against the inner wall of the cylinder liner, so that the piston top (1) and the cylinder liner form a sealed chamber.

7. The adaptive height piston according to claim 3, characterized in that, Both the docking shaft (12) and the docking boss (21) have oil storage grooves on their outer walls, and each oil storage groove is filled with lubricating grease.

8. The adaptive height piston according to claim 4, characterized in that, The width of the retaining ring (4) is greater than the depth of the mounting groove (13), so that the outer edge of the retaining ring (4) extends outside the mounting groove (13). When the piston top (1) and the piston skirt (2) move to the maximum distance in opposite directions, the retaining ring (4) is clamped between the end face of the locking member (3) and the piston skirt (2). The retaining ring (4) is used to buffer the collision between the locking member (3) and the piston skirt (2).

9. The adaptive height piston according to claim 1, characterized in that, The positioning section is threaded on its outer periphery, and the locking member (3) is a nut. The positioning section is threadedly connected to the locking member (3).

10. The adaptive height piston according to claim 4, characterized in that, The piston top (1), piston skirt (2), docking shaft (12), and docking hole (22) are all coaxially arranged.

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