Rolling piston capable of changing sliding friction to rolling friction between piston and cylinder

[0016] The implementation of the present invention will be described in detail below in conjunction with the drawings, but they do not constitute a limitation to the present invention.

[0017] A method for changing the sliding friction between the piston and the cylinder to rolling friction. The invention adopts a rolling pin or a roller to roll on the cylinder wall.

[0018] Refer to figure 1 , figure 2 It can be seen that an embodiment of the present invention is composed of a piston body 1 and a plurality of rolling bodies 2 located around the piston body, and a connecting fixture 3 is arranged between the piston body and the rolling bodies.

[0019] The rolling element 2 is a roller, the connecting holder includes an upper piston sleeve 3-1, a lower piston sleeve 3-2, and the roller 2 is located between the upper piston sleeve 3-1 and the lower piston sleeve 3-2 Inside the groove 3-3, and partly outside the opening 3-4 between the upper piston sleeve and the lower piston sleeve, the upper piston sleeve and the lower piston sleeve are clamped on the piston body 1.

[0020] In the present invention, the upper piston sleeve 3-1 and the lower piston sleeve 3-2 each have several half-sided drum-shaped grooves 3-3 for embedding the roller 2 (or drum marble); or: the upper piston sleeve, the lower piston sleeve The groove 3-3 of the piston sleeve is closed to catch the roller 2 (drum pin), but because the outer circumference of the groove 3-3 is slightly retracted than the outer edge of the roller 2 (or drum pin), an opening 3 is formed. 4. Make the exposed part of the roller 2 (or drum-shaped marble) contact the cylinder wall. When the piston moves in the cylinder, the drum-shaped marble rolls on the cylinder wall.

[0021] An L-shaped groove can be opened on the piston body 1, and the rolling piston ring is introduced from the part of the L-shaped groove parallel to the axial direction, and the L-shaped groove is rotated and locked on the piston body 1 along the circumferential part.

[0022] Participate image 3 , Figure 4 , Figure 5 It can be seen that another embodiment of the present invention is composed of a piston body 1, an upper piston sleeve 3-1, a lower piston sleeve 3-2, and a plurality of rollers 2; the connecting fixture includes an upper piston sleeve 3-1, Lower piston sleeve 3-2.

[0023] The roller 2 is assembled on the piston body 1 with upper and lower piston sleeves 3-1 and 3-2, and the roller 2 is equipped with a ball bearing 2-1, so that the roller 2 is supported by the ball bearing 2-1 and mounted on the shaft 2. -2 Turn up. Similarly, the slight retraction of the edges of the upper and lower piston sleeves forms the exposed opening 3-4 of the roller 2 so that the roller 2 rolls on the cylinder wall.

[0024] The shape of the piston body 1 is a polygonal prism, and each side of it has grooves 1-1 that can accommodate half of the roller. After the assembly is completed, the longitudinal section of the roller 2 coincides with the side of the piston where it is located, and all rollers 2 The axis forms a regular polygon (see Figure 4 ), and on a cross section of the piston body 1.

[0025] The inner peripheries of the upper and lower piston sleeves 3-1 and 3-2 are polygonal prisms that are tightly fitted to the piston body 1, and the outer circumference is cylindrical. The inner sides of the upper and lower piston sleeves 3-1 and 3-2 are accommodated on each surface One quarter of the groove 3-3 of the roller 2 and the outer circumference of the piston sleeves 3-1 and 3-2 are slightly retracted from the outer edge of the roller 2, thereby forming an opening 3 that exposes the roller 2 to the cylinder wall -4.

[0026] The two ends of each roller 2 are embedded in the two ends of the grooves on the piston body 1 and the piston sleeves 3-1 and 3-2, and the roller body of the roller 2 is connected with the outer ring of the ball bearing 2-1, Then the roller body is supported by the ball bearing and rotates on the shaft, and the grooves on the piston body 1 and the piston sleeves 3-1 and 3-2 leave a margin corresponding to the roller body, so that the roller body is not allowed to occur in the groove. Dry friction.

[0027] Refer to Figure 6 , Figure 7 It can be seen that another embodiment of the present invention consists of a piston body and a plurality of rolling bodies located around the piston body, and a connecting fixture is arranged between the piston body and the rolling bodies. The rolling element is a rolling pin 2, and the connecting and fixing device includes a thrust concave pin 3-5, a bracket 3-6 with a spring, and a base 3-7; the inner side of the rolling pin 2 is formed by a thrust concave pin 3-8 The supporting and thrust concave pinball is installed in the shaft hole of the bracket 3-6 with spring, the bracket 3-6 with spring is fixed on the base 3-7, and the base 3-7 is integrated with the piston body 1 .

[0028] The invention opens a window on the piston body 1 to expose the contact part of the rolling pin 2 and the cylinder liner, and uses the thrust concave pin 3-5 and the spring bracket 3-6 to make the outer rolling pin 2 and the cylinder liner tightly fit.

[0029] The rolling pin 2 is a conical pin, the longitudinal section of the central axis of the pin is a rhombus with an apex angle of 60°, and the cross section is a circle. Six conical pins (the number of pins can be changed according to the specific situation) are arranged around the piston. Hexagonal shape, and there is a narrow gap between the vertices of the two marbles. Obviously, the corresponding cylinder cavity is also a regular hexagonal prism.

[0030] The upper part of the piston body 1 is a regular hexagonal prism whose sides are slightly retracted from the inner cavity of the cylinder liner. The upper part of the piston body 1 is tightly integrated with the inner cavity of the cylinder liner. This is to: firstly, reduce the leakage loss, and secondly, easily achieve the required compression ratio, and the combustion area is more concentrated and the combustion is more complete. The lower part of the piston body is a regular hexagonal prism whose surface is aligned with the central axis of the cone ball, but its six ridges are cut off and replaced by the extension of the upper six cylinders to form six narrow strips. At the boundary between the lower part of the piston and the upper part, dig six windows containing half-cone marbles (the window abdomen is aligned with the edge of the upper part of the piston). Use a suitable profiling machine to process the edge of the window into a conical surface that matches the marble. The outer edge is a rhombus (the tip is naturally drawn as a curve by a narrow strip), and the inner edge is two hyperbolic curves with the rhombus as the asymptotic line and the open ends coincide with each other.

[0031] The thrust concave pin 3-5 keeps the cone pin in contact with the inner wall of the cylinder. In the piston cavity, each cone pin is equipped with a pair of thin-waisted concave pin 3-5, which pushes the cone pin. The cylinder walls are oriented and can roll against each other.

[0032] The shaft of the thrust concave pin 3-5 is installed on the bracket 3-6 with spring, so that the concave pin on each pair of brackets clamps the cone pin, and the resultant force pushes against the inner wall of the cylinder.

[0033] The base 3-7 is set in the center of the piston cavity as a regular hexagonal prism base. There are two pairs of shaft holes on each side for installing the bracket 3-6 with spring. When the mechanism is a little worn, the bracket The springs tighten the pair of brackets to reduce the angle between each pair of brackets. (Include the angle at the beginning is 20.6°) Keep the cone-shaped billet and the cylinder wall still close.

[0034] It should be noted that for those skilled in the art, several changes or modifications can be made to the present invention without changing the principle of the present invention, which also belongs to the protection scope of the present invention.