CN110052995A - A kind of auxiliary thumbnail and piston ring tool - Google Patents

Abstract

The invention discloses an auxiliary thumb nail and a piston ring disassembly and assembly tool. The auxiliary thumb nail is composed of a thumb clamping surface, a force application surface and a working surface; the thumb clamping surface is a cylindrical surface; the second end of the thumb clamping surface is fixedly connected with the first end of the force application surface; the second end of the force application surface is fixedly connected; The end is fixedly connected with the first end of the working surface; the working surface and the axis of the thumb clamping surface form a specific angle; the distance from the first end of the working surface to the first end of the force-applying surface is a specific value; the first end of the working surface and the thumb The distance of the center line of the card position is a specific value. The invention provides a flexible manual scraping tool, which avoids damage caused by direct force applied by fingernails, and improves the force of scraping by pressing and exerting force with the thumb; the scraping process can be accurately positioned, the force can be applied accurately, and it is flexible and convenient . Provided is a piston ring disassembly and assembly tool composed of two auxiliary thumb nails, which can be used for disassembly and assembly of various piston rings with a cylinder diameter of less than 120 mm, and improves the efficiency of piston ring disassembly and assembly.

Description

An auxiliary thumb nail and piston ring disassembly and assembly tool

technical field

The invention relates to the field of internal combustion engine maintenance, in particular to an auxiliary thumb nail and a piston ring disassembly and assembly tool.

Background technique

During engine maintenance, disassembly and installation of piston rings is a common maintenance content. At present, piston ring disassembly and assembly pliers are usually used for disassembly and assembly of piston rings. When disassembling and assembling the piston ring, the three fulcrums of the piston ring disassembling and assembling pliers are used for the flat end piston ring, which has the problem of unstable lifting of the piston ring, and the tension force when disassembling the piston ring is opened by the opening of the piston ring disassembling and assembling pliers, and the strength is not strong. Easy to control, easy to break the piston ring, and higher technical requirements for the piston ring loading and unloading personnel. On the other hand, piston ring disassembly and assembly pliers are only suitable for piston rings of a specific diameter, and piston rings of various diameters will be encountered during maintenance. Maintenance personnel need to replace piston ring disassembly and assembly pliers in time, which increases the work of maintenance personnel. quantity. For this reason, in practice, many maintenance personnel will use their thumb nails to buckle the piston ring, and hold the piston ring with their hands for disassembly and assembly. This disassembly and assembly method is stable and suitable for disassembly and assembly of various small-bore engine piston rings; however, it often causes problems such as nail damage, finger pain and injury, and it is difficult to use this method for a long time.

Therefore, those skilled in the art are devoted to developing an auxiliary thumb nail and piston ring disassembly and assembly tool, the auxiliary thumb nail simulates the human thumb nail, and is used to perform the pulling action, which enhances the pulling force and avoids the damage of the thumb nail. , which provides an easy-to-use tool for the disassembly and assembly of the piston ring.

SUMMARY OF THE INVENTION

In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to solve the occasions where the thumb nail is frequently used for pulling and pulling, which is easy to cause the thumb nail to be damaged, the separation of the thumb nail and the thumb, causing finger pain and insufficient pulling force of the thumb nail. problems, especially to solve the problem of inconvenient disassembly and assembly of piston rings in engine maintenance.

In order to achieve the above purpose, the present invention provides an auxiliary thumb nail, which is composed of a thumb clamping surface, a force application surface and a working surface;

The thumb clamping surface is a cylindrical surface;

The second end of the thumb engaging surface is fixedly connected with the first end of the force applying surface;

The second end of the force-applying surface is fixedly connected with the first end of the working surface;

The working surface forms a specific angle with the axis of the thumb clamping surface;

The distance from the first end of the working surface to the first end of the force applying surface is a specific value;

The distance from the first end of the working surface to the center line of the thumb engaging surface is a specific value.

Further, the second end of the force applying surface further includes a positioning surface, the positioning surface and the working surface form a specific angle, and the length of the positioning surface is a specific value.

Further, the force-applying surface also includes an elastic holding band.

Further, the inner side of the thumb engaging surface is covered with rubber, silica gel or cloth or fiber material.

Further, an anti-skid surface is also provided on the force applying surface, and the anti-skid surface is an embossed surface, a sawtooth surface, a step or a surface with anti-skid bosses.

Further, the working surface is a concave arc surface, a convex arc surface, a plane surface, a V-shaped groove surface or a U-shaped groove surface.

Further, the thumb engaging surface, the force applying surface and the working surface are configured to be fixed into one body by welding, bonding or bolting.

Further, the working surface forms an angle of 60-90 degrees with the axis of the thumb engaging surface.

Further, the distance from the first end of the working surface to the center line of the thumb engaging surface is 1.2-1.8 cm.

The present invention also provides a piston ring disassembly and assembly tool, which is composed of two auxiliary thumb nails according to any one of claims 1-9.

In a preferred embodiment of the present invention, an auxiliary thumb nail is provided, which is composed of a thumb engaging surface, a force applying surface and a working surface.

The thumb clamping surface is a cylindrical surface; its length is 1.5-2.5 cm, preferably, its length is 2.0 cm; the first end of the thumb clamping surface is at the tiger's mouth, and the second end of the thumb clamping surface does not cross the thumb The joints of the first and second segments; the inner diameter of the thumb rest surface is 1.8-2.8 cm. The thumb catch surface is placed on the thumb. When the thumb is bent, the center line of the thumb catch surface is offset from the second phalanx of the thumb, so that the first end of the thumb catch surface is stuck on the side of the tiger's mouth at the base of the thumb. The second end of the plane snaps to the outside of the back of the second thumb joint. In this way, the thumb clamping surface is relatively fixed with the second joint of the thumb, and the thumb clamping surface is clamped on the thumb.

The second end of the thumb engaging surface is fixedly connected with the first end of the force applying surface.

The force application surface is equivalent to a smooth transition surface from the thumb clamping surface to the working surface, and its length is 1.8-3.3 cm, preferably, the length is 2.8 cm; the lateral width of the first end of the force application surface is 1.4-2.0 cm, preferably , with a width of 1.8 cm. If the length of the force-applying surface is too long, the force-applying point of the thumb is too far from the object to be pulled, and the auxiliary thumb nail and the object to be pulled are easy to shake, resulting in unstable work; if the length is too short, it is inconvenient for the thumb to exert force. The first end of the force-applying surface is fixedly connected with the second end of the thumb clamping surface, and has a certain angle relative to the axis of the thumb clamping surface, and the angle is 0-15 degrees, preferably, the angle is 10 degrees. One of the main functions of the force-applying surface is to have enough force-applying space to facilitate the application of force; the other is to ensure accurate positioning and avoid the separation of the working surface from the pulled structure or the intrusion of too many objects on the working surface. The width of the first end of the force-applying surface to the first end of the working surface is smoothly transitioned.

The second end of the force-applying surface is fixedly connected with the first end of the working surface.

The working surface is a structure that assists the thumb nail to directly exert force on the object being pulled. The width of the working surface is 0.4-1.2 cm. The determination of the width depends on the application, usually 0.6 cm can meet the application of disassembly and assembly of the piston ring. The length of the working surface is 0.3-1.0 cm, preferably, the length is 0.6 cm.

The working surface is 60-90 degrees from the axis of the thumb clamping surface. If the angle is too small, the contact surface will be reduced; if the angle is too large, the working surface and the pulled structure will slip. The preferred angle is 85 degrees.

The distance from the first end of the working surface to the first end of the force application surface is 1.8-3.2 cm, and preferably, the length is 2.8 cm. If the distance is too small, it is inconvenient for the thumb to exert force; if the distance is too large, it is not easy to maintain a stable contact.

The distance from the first end of the working surface to the center line of the thumb clamping surface is 1.2-1.8 cm, and the preferred distance is 1.5 cm. If the distance is too small, the positive pressure between the thumb and the force-applying surface will be reduced; if the distance is too large, it is not conducive to accurate positioning and stable work.

In a preferred embodiment of the present invention, the second end of the force-applying surface further includes a positioning surface. The positioning surface is a flat or arc surface. The horizontal distance from the first end of the positioning surface to the second end of the thumb clamping surface is 1.4-2.3 cm. Preferred is 1.8 cm. The distance from the positioning surface to the center line of the thumb clamping surface is 0.7-1.3 cm. Preferred is 0.9 cm. The width of the first end of the positioning surface is greater than the width of the second end. The angle between the positioning surface and the working surface is 60-90 degrees, and preferably, the positioning surface and the working surface form an angle of 85 degrees. When using the auxiliary thumb nail structure, the positioning surface is close to the object to provide support and positioning for the working surface, so as to prevent the working surface from being separated from the structure being pulled or the working surface intruding too much into the object.

In a preferred embodiment of the present invention, the force-applying surface further includes an elastic retaining band, and the elastic retaining band is configured to be tied around the front end of the thumb. The length of the elastic retaining band in the unstretched state is 1.5-2.5 cm, and the preferred length is 2 cm. The length of the elastic retaining band in the stretched state is 3-6 cm, and the preferred length is 4 cm. The elastic force is 2-10N, preferably 3N. The elastic retaining band makes the thumb fit with the force-applying surface, prevents the thumb from being separated from the force-applying surface, and increases the operational flexibility.

In a preferred embodiment of the present invention, the inner side of the thumb engaging surface is covered with rubber, silica gel or cloth or fiber material. Ensure that the contact surface between the thumb and the inner side of the thumb clamping surface has good flexibility, avoid thumb injury, increase comfort, and improve finger force.

In a preferred embodiment of the present invention, a non-slip surface is further provided on the force applying surface. The non-slip surface is an embossed surface, a serrated surface, a step or a surface with a non-slip boss. The force-applying surface is an important part of the thumb for applying force, and it is also the most forceful part of the entire disassembly and assembly mechanism. The non-slip surface can increase the roughness of the contact surface, thereby increasing the friction between the thumb and the force-applying surface, preventing slippage between the thumb and the force-applying surface, improving the thumb force and making the positioning more accurate.

In a preferred embodiment of the present invention, the working surface is a concave arc surface, a convex arc surface, a flat surface, a V-shaped groove surface or a U-shaped groove surface. The main function of the working surface is to contact the object being pulled. When pulling some sharp objects, it is necessary to prevent them from falling off. At this time, the concave arc surface is used as the working surface, which can enhance the positioning. For some occasions with high hardness, in order to generate positive pressure on the surface, the working surface in the form of a convex arc surface is used to improve the fit between the working surface and the object to be pulled. For common applications, a flat work surface can be used for ease of manufacture. The V-shaped groove surface or the U-shaped groove surface has a deep groove shape, which can increase the contact area between the working surface and the object to be pulled, improve the positioning effect, and prevent slippage.

In a preferred embodiment of the present invention, the thumb engaging surface, the force applying surface and the working surface are fixed into one body by welding, bonding or bolting, so that they can be manufactured separately. The thumb clamping surface and the force application surface can be made of different materials, the force application surface is made of a material with greater rigidity, and the thumb clamping surface is made of soft material. The utility model can not only ensure that the auxiliary thumb nail has greater rigidity and strength, avoid excessive deformation, but also make the thumb come into contact with the soft material, thereby improving the comfort of use.

In a preferred embodiment of the present invention, the working surface and the axis of the thumb engaging surface form an angle of 60-90 degrees. If the angle is too small, the contact surface will be reduced, and it is easy to cause excessive stress and unstable positioning between the working surface and the object to be pulled; The preferred angle is 85 degrees.

In a preferred embodiment of the present invention, the distance from the first end of the working surface to the center line of the thumb engaging surface is 1.2-1.8 cm, and the preferred distance is 1.5 cm. The working surface is a structure that assists the thumb nail to directly exert force on the object being pulled. If the distance is too small, the positive pressure between the thumb and the force-applying surface will be reduced, which will affect the pulling force and make it difficult for the thumb to apply force on the force-applying surface. The deflection force produces a large moment, which is not conducive to accurate positioning and stable work.

The present invention also provides a piston ring disassembly and assembly tool, which is composed of two auxiliary thumb nails according to any one of claims 1-9.

When removing the piston ring, wear an auxiliary thumb nail on each of the left and right thumbs. Press the positioning surface against the outer circumference of the piston ring next to the notch of the piston ring, and the working surface penetrates into the opening of the piston ring. The auxiliary thumb nail of the left hand buckles the open end of the left side of the piston ring, and the auxiliary thumb nail of the right hand buckles the open end of the right side of the piston ring. Use both hands to pull the piston ring outward with the aid of thumb nails to increase the opening of the piston ring, and then take out the piston ring.

When assembling the piston ring, wear auxiliary thumb nails on the thumbs of the left and right hands, the positioning surfaces of the auxiliary thumb nails of the left and right hands are close to the outer circular surfaces on both sides of the opening of the piston ring, and the working surfaces of the auxiliary thumb nails of the left and right hands are tightly fastened to the piston ring. The left and right ends of the ring opening. The left and right hands exert force outward to enlarge the opening of the piston ring, insert the piston ring into the groove of the piston ring, and then reduce the force of the auxiliary thumb nail, so that the working surface and the positioning surface are separated from the piston ring, and the installation of the piston ring is completed.

The beneficial effects of the present invention are:

(1) A flexible manual scraping tool is provided to avoid damage to the fingernails due to direct force application, and the force of the scraping is improved by pressing the force with the thumb.

(2) The scraping process can be positioned accurately, force is applied accurately, and it is flexible and convenient.

(3) It can be used for disassembly and assembly of various piston rings with a cylinder diameter of less than 120mm, which improves the efficiency of disassembly and assembly of piston rings.

The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, characteristics and effects of the present invention.

Description of drawings

1 is a schematic structural diagram of an auxiliary thumb nail according to a preferred embodiment of the present invention;

2 is a schematic diagram of the arrangement of the anti-skid bosses on the force-applying surface according to a preferred embodiment of the present invention;

Figure 3 is a schematic diagram of the section line from point A to point B on the force application surface shown in Figure 2;

FIG. 4 is a schematic diagram of a bolted joint between the force applying surface and the thumb clamping surface according to a preferred embodiment of the present invention;

Fig. 5 is a partial enlarged view of A shown in Fig. 4;

6 is a schematic diagram of disassembling and disassembling piston rings using a piston ring disassembling and disassembling tool according to a preferred embodiment of the present invention;

Fig. 7 is a partial enlarged view of A shown in Fig. 6;

In the attached drawings: 1—thumb clamping surface, 2—force-applying surface, 3—working surface, 4—thumb clamping surface lining, 5—positioning surface, 6—elastic retaining belt, 7—anti-slip boss, 8— Force-applying surface section line, 9—bolt joint.

Detailed ways

The following describes several preferred embodiments of the present invention with reference to the accompanying drawings, so as to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned herein.

In the drawings, structurally identical components are denoted by the same numerals, and structurally or functionally similar components are denoted by like numerals throughout. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thicknesses of components are appropriately exaggerated in some places in the drawings.

Example 1

As shown in FIG. 1 , it is a schematic structural diagram of an auxiliary thumb nail according to a preferred embodiment of the present invention. The auxiliary thumb nail in this embodiment includes a thumb engaging surface 1, a force-applying surface 2, and a working surface 3. A lining material 4 such as rubber, silica gel, cloth, or fiber material is built into the thumb engaging surface 1. Positioning surfaces 5 are provided at both ends, and elastic retaining bands 6 are provided on the force applying surface 2 .

The thumb clamping surface 1 is a cylindrical surface with a length of 2.1 cm; the first end of the thumb clamping surface 1 is at the tiger's mouth, and the second end of the thumb clamping surface 1 does not cross the first and second sections of the thumb. Joints; the inner diameter of the thumb rest surface 1 is 2.6 cm. The thumb engaging surface 1 is put on the thumb. When the thumb is bent, the center line of the thumb engaging surface 1 is offset from the second phalanx of the thumb, so that the first end of the thumb engaging surface 1 is stuck on the side of the tiger's mouth at the base of the thumb. , the second end of the thumb clamping surface 1 is clamped on the outside of the back of the second thumb joint. In this way, the thumb engaging surface 1 is relatively fixed to the second joint of the thumb, and the thumb engaging surface 1 is clamped on the thumb.

The second end of the thumb engaging surface 1 is fixedly connected with the first end of the force applying surface 2 .

The force applying surface 2 is equivalent to a smooth transition surface from the thumb clamping surface 1 to the working surface 3, and its length is 3.0 cm; the lateral width of the first end of the force applying surface 2 is 1.6 cm. The first end of the force applying surface 2 is fixedly connected with the second end of the thumb clamping surface 1, and the angle relative to the axis of the thumb clamping surface 1 is 9 degrees. The length of the force-applying surface 2 can ensure that there is enough force-applying space to facilitate the application of the force; at the same time, it can ensure accurate positioning, and prevent the working surface 3 from being separated from the pulled structure or the working surface 3 intruding too many objects. The width of the first end of the force applying surface 2 to the first end of the working surface 3 smoothly transitions.

The second end of the force applying surface 2 is fixedly connected with the first end of the working surface 3 .

The working surface 3 is a structure that assists the thumb nail to directly exert a force on the object to be pulled. The width of the working surface 3 is 0.55 cm, which can meet the application of disassembly and assembly of the piston ring. The length of the working surface 3 is 0.5, 0.6, 0.7 cm. The working surface 3 forms an angle of 60-90 degrees with the axis of the thumb clamping surface 1 . If the angle is too small, the contact surface will be reduced, the contact will be unstable, resulting in slippage; if the angle is too large, the working surface 3 and the object to be pulled will slip. Preferred angles are 83, 85, 87 degrees. The distance from the first end of the working surface 3 to the first end of the force-applying surface 2 is 1.8-3.2 cm, optionally 2.4 or 2.8 cm. If the distance is too small, it is inconvenient for the thumb to exert force; if the distance is too long, it is not easy to maintain the stability between the auxiliary thumb nail and the object being pulled. The distance from the first end of the working surface 3 to the center line of the thumb clamping surface 1 is 1.2-1.8 cm, and the preferred distance is 1.5 cm. If the distance is too small, the positive pressure between the thumb and the force-applying surface 2 will be reduced, which will affect the pulling force and make it difficult for the thumb to exert force on the force-applying surface 2; The distance of 1 will cause the deflection force to generate a large moment, which is not conducive to accurate positioning and stable work.

The inner side of the thumb clamping surface 1 is covered with rubber, silicone or cloth, fiber and other lining materials 4 . It is ensured that the contact surface between the thumb and the inner side of the thumb clamping surface 1 has good softness, avoids injury to the thumb, increases comfort, and improves finger force.

The second end of the force applying surface 2 also includes a positioning surface 5 . The positioning surface 5 is a plane or arc surface. The horizontal distance from the first end of the positioning surface 5 to the second end of the thumb engaging surface 1 is 1.4-2.3 cm, preferably 1.8 cm. If the distance is too small, it is not conducive to the thumb exerting force on the force-applying surface 2; if the distance is too long, the rigidity of the force-applying surface 2 to the positioning surface 5 will be reduced, and it is not convenient for the stable positioning of the working surface 3 and the object to be pulled. The distance from the positioning surface 5 to the center line of the thumb engaging surface 1 is 0.7-1.3 cm, preferably 0.9 cm. If the distance is too small, it is difficult for the thumb to exert force on the force-applying surface 2, which is not conducive to the work of the working surface 3; if the distance is too large, the thumb will be bent too much, which is not conducive to the stable positioning of the working surface 3 and the object to be pulled. The width of the first end of the positioning surface 5 is greater than the width of the second end. The length of the positioning surface 5 is 0.4-0.8 cm, preferably 0.6 cm. The angle between the positioning surface 5 and the working surface 3 is 60-95 degrees. Preferably, the positioning surface 5 and the working surface 3 form an angle of 85 degrees. When the auxiliary thumb nail structure is used, the positioning surface 5 is close to the object to provide support and positioning for the working surface 3 to prevent the working surface 3 from being detached from the pulled knotted object or the working surface 3 intruding into objects too much.

The force-applying surface 2 also includes an elastic retaining band 6, which is arranged to be tied around the front end of the thumb, and the length of the elastic retaining band 6 in an unstretched state is 1.5-2.5 cm, preferably 2 cm. The length of the elastic holding belt 6 in the stretched state is 3-6 cm, and the preferred length is 4 cm. The elastic force is 2-10N, preferably 3N. The elastic retaining band 6 makes the thumb fit together with the force-applying surface 2, prevents the thumb from being separated from the force-applying surface 2, and increases the operational flexibility.

Example 2

FIG. 2 is a schematic diagram of the arrangement of the anti-skid bosses on the force-applying surface according to a preferred embodiment of the present invention. The anti-slip boss 7 in this embodiment is an anti-slip measure for the force-applying surface 2 to ensure the force exerted by the thumb. The force-applying surface 2 is an important part of the thumb for applying force, and it mainly relies on positive pressure and friction to generate pulling force. The anti-skid bosses 7 are arranged on the force application surface 2 to prevent slippage between the thumb and the force application surface 2, increase the friction force, appropriately reduce the positive pressure, reduce the force at both ends of the thumb clamping surface 1, and improve the working process. comfort. In addition, the anti-slip boss 7 can increase the roughness of the contact surface, thereby increasing the friction between the thumb and the force-applying surface 2 . During use, the anti-slip boss 7 can prevent slippage between the thumb and the force-applying surface 2, improve the force of the thumb, and make the positioning more accurate.

FIG. 3 is a schematic diagram of a section line from point A to point B on the force application surface shown in FIG. 2 . The section line 8 of the force applying surface 2 is the center line of the cross section from the point A to the point B on the force applying surface 2 shown in FIG. 2 . The length of the force-applying surface 2 is 2.8 cm, point A is at the first end of the force-applying surface 2, and point B is at the second end of the force-applying surface 2. Point A is used as the origin of the coordinates, AB is used as the X-axis, the Y-axis passes through point A and is perpendicular to the X-axis, the XAY coordinate system is a right-handed system, and the scale unit of the coordinate system is millimeters. The preferred shape of the AB centerline is expressed as a function in the coordinate system shown in Figure 3: y=0.8634·sin(0.3956·x-3.765)+1.614·sin(0.05978·x+1.845), x∈[0, 28]. The section line 8 of the force application surface 2 in this function expression can ensure that the angle between the second end of the thumb engaging surface 1 and the first end of the force application surface 2 is 10 degrees, and the working surface 3 and the axis of the thumb engaging surface 1 form an angle of 85 degrees It can also ensure that the force-applying surface 2 has enough force-applying space to facilitate the application of the force; there is enough space as the positioning surface 5, which can ensure accurate positioning and avoid the working surface 3 and the object being pulled or pulled. Too many objects.

Example 3

FIG. 4 is a schematic diagram of a bolted joint between the force applying surface and the thumb clamping surface according to a preferred embodiment of the present invention. The thumb clamping surface 1 and the force-applying surface 2 are manufactured separately, and are fixed into one body by bolted joints 9 . The bolted joint 9 is a high-strength connection. The thumb engaging surface 1 and the force-applying surface 2 are made of different materials, the force-applying surface 2 is made of a material with higher rigidity, and the thumb engaging surface 1 is made of a soft material. Using the bolt connection joint 9 can make the thumb clamping surface 1 and the force applying surface 2 assembled and connected, which is convenient for manufacture and disassembly. It can not only ensure that the auxiliary thumb has greater rigidity and strength, avoid excessive deformation, but also make the thumb contact with soft materials, thereby improving the comfort during use.

FIG. 5 is a partial enlarged view of A shown in FIG. 4 . The working surface 3 in the partial enlarged view of A uses a V-shaped groove to directly exert force on the object to be pulled. For slender pointed objects, it is necessary to prevent the objects from slipping off during the working process. The groove shape of the V-shaped groove is relatively deep, which can enhance the positioning. During use, the V-shaped groove can increase the contact area between the working surface 3 and the object to be pulled, so that the open end of the object to be pulled is fixed in the groove, which improves the positioning effect and prevents slipping.

Example 4

FIG. 6 is a schematic diagram of disassembling and disassembling the piston ring using a piston ring disassembling and disassembling tool according to a preferred embodiment of the present invention. This embodiment provides a piston ring disassembly and assembly tool, which is composed of two auxiliary thumb nails. The two auxiliary thumb nails are respectively set on the thumbs of the operator's left and right hands, the working surface 3 of the auxiliary thumb nail is inserted into the opening of the piston ring, and the positioning surface 5 is clamped on the outer circular surface of the piston ring. When disassembling the piston ring, the thumbs of both hands clasped the force application surface 2 to exert force, and the auxiliary thumb nails pull the piston ring outward, so that the opening of the piston ring is enlarged, and the piston ring is taken out; when assembling the piston ring, the thumbs of both hands pass the force application surface 2 to the outer ring. Apply external force to increase the opening of the piston ring, insert the piston ring into the piston ring groove, and then reduce the force applied by the auxiliary thumb nail, so that the working surface 3 and the positioning surface 5 are separated from the piston ring, and the installation of the piston ring is completed. The auxiliary thumb nail exerts force on the force application surface 2 through the thumb, which can easily open the piston ring, and is not limited by the diameter of the piston ring, and can disassemble and assemble the piston ring with a cylinder diameter less than 120mm.

FIG. 7 is a partial enlarged view of A shown in FIG. 6 . The partial enlarged view of A is the positioning diagram of the force applying surface 2 and the working surface 3 on the piston ring. The working surface 3 is buckled on the open end face of the piston ring, and the positioning surface 5 is pressed against the outer circular surface of the piston ring. The positioning surface 5 ensures that the working surface 3 and the open end surface of the piston ring fit together, and maintain the stability during the disassembly and assembly process. The piston ring disassembly and assembly tool provided in this embodiment can increase the pulling force and improve the disassembly and assembly efficiency of the piston ring.

The preferred embodiments of the present invention have been described in detail above. It should be understood that many modifications and changes can be made according to the concept of the present invention by those skilled in the art without creative efforts. Therefore, any technical solutions that can be obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the prior art according to the concept of the present invention shall fall within the protection scope determined by the claims.

Claims (10)

1. a kind of auxiliary thumbnail, which is characterized in that be made of thumb card plane, force surface and working face；

The thumb card plane is a cylinder face；

The thumb card plane second end is fixedly connected with the first end of the force surface；

The second end of the force surface is fixedly connected with the first end of the working face；

The working face and the thumb card plane axis are at special angle；

The distance of the first end of the working face to the force surface first end is particular value；

The first end of the working face to the thumb card plane center line distance be particular value.

2. auxiliary thumbnail as described in claim 1, which is characterized in that the force surface second end further includes positioning surface, At special angle, the length of the positioning surface is particular value for the positioning surface and the working face.

3. auxiliary thumbnail as described in claim 1, which is characterized in that further include elastic retaining strap on the force surface.

4. auxiliary thumbnail as described in claim 1, which is characterized in that be covered with rubber, silicon on the inside of the thumb card plane Glue or cloth, fibrous material.

5. auxiliary thumbnail as described in claim 1, which is characterized in that non slip surface is additionally provided on the force surface, it is described Non slip surface is embossing face, serrated face, step or the face to there is anti-skidding boss.

6. auxiliary thumbnail as described in claim 1, which is characterized in that the working face is cancave cambered surface, convex globoidal, puts down Face, V-shaped groove surface or U-type groove face.

7. auxiliary thumbnail as described in claim 1, which is characterized in that the thumb card plane, the force surface and institute Working face is stated to be arranged to be integrally formed with the fixation of welding, bonding or bolt connecting mode.

8. auxiliary thumbnail as described in claim 1, which is characterized in that the working face and the thumb card plane axis At 60-90 degree angle.

9. auxiliary thumbnail as described in claim 1, which is characterized in that the first end of the working face to the thumb card The distance of the center line of plane is 1.2-1.8 centimetres.

10. a kind of piston ring tool, which is characterized in that by two auxiliary thumbnails as described in any in right 1-9 Composition.