High-rotating-speed chain saw type crankshaft connecting rod assembly

Abstract

The utility model provides a high rotation speed chain saw type crankshaft connecting rod assembly, which comprises a left crank, a right crank, a crank pin, a bearing and a connecting rod, the left crank and the right crank are respectively provided with a left fixing hole and a right fixing hole, and two ends of the crank pin are respectively fixed in the left fixing hole and the right fixing hole. The crank mechanism further comprises organic friction plates used for abutting against the side wall of the connecting rod, the organic friction plates are fixedly arranged on the crank pin in a sleeved mode, the two organic friction plates are located on the left side and the right side of the connecting rod respectively, and the purpose that severe abrasion is not prone to being generated between the connecting rod and the left crank or the right crank is achieved.

Description

Technical Field

[0001] The utility model relates to the field of engines, and particularly to a crankshaft connecting rod assembly for high-speed chainsaws. Background Art

[0002] A chainsaw is a handheld wood cutting machine powered by a gasoline engine and with a saw chain as the cutting component.

[0003] Currently, the Chinese patent with the authorization announcement number CN203510352U discloses a crankshaft connecting rod device on a new type of chainsaw, which includes a left crank, a right crank, a crank pin, a connecting rod body, and a needle bearing. The left crank and the right crank are connected into one body through the crank pin, and the connecting rod body and the crank pin rotate through the needle bearing sleeved between the two. A keyway is provided on the left crank. Threads are provided at the ends of the left crank and the right crank.

[0004] The left crank and the right crank are connected through the crank pin, and the connecting rod body and the crank pin rotate through the needle bearing sleeved between the two. The connection is firm and the movement is smooth. The keyway on the left crank makes the movement more stable.

[0005] However, during long-term use, insufficient lubricating oil supply between the needle bearing and the crank pin will increase the friction between the connecting rod body and the needle bearing, which is likely to cause the connecting rod body to shift axially along the crank pin, and is likely to cause severe wear between the connecting rod body and the left crank or the right crank. Summary of the Utility Model

[0006] In view of this, the purpose of the utility model is to provide a crankshaft connecting rod assembly for high-speed chainsaws, which reduces severe wear between the connecting rod and the left crank or the right crank by providing an organic friction plate that abuts against the side wall of the connecting rod.

[0007] To solve the above technical problems, the technical solution of the utility model is: a crankshaft connecting rod assembly for high-speed chainsaws, including a left crank, a right crank, a crank pin, a first bearing, and a connecting rod. Left fixing holes and right fixing holes are respectively provided on the left crank and the right crank. Two ends of the crank pin are respectively fixed in the left fixing hole and the right fixing hole. The connecting rod is rotatably connected to the crank pin through the first bearing. The assembly further includes an organic friction plate for abutting against the side wall of the connecting rod. The organic friction plate is sleeved and fixed on the crank pin, and the two organic friction plates are respectively located on the left and right sides of the connecting rod.

[0008] When the lubricating oil supply of the first bearing is insufficient, the connecting rod shifts axially along the crank pin and abuts against the organic friction plate. Since the organic friction plate has good smoothness and wear resistance, the problems of severe wear of the connecting rod, the left crank, and the right crank are not likely to occur, thus greatly extending the service life.

[0009] As a preferred embodiment of the present utility model, annular grooves are formed in the organic friction plate, and a pressure ring for abutting against the side wall of the connecting rod is slidably connected in the annular grooves. An elastic member is connected between the inner wall of the annular groove and the pressure ring. An oil storage groove communicating with the annular groove is formed in the organic friction plate, and a sealing plate is connected to the opening of the oil storage groove.

[0010] To achieve the above technical solution, when the connecting rod moves along the axial direction of the crank pin, the side wall of the connecting rod abuts against the pressure ring, and the elastic force of the elastic member acts to support the connecting rod, making it difficult for the connecting rod to continue moving. Moreover, since the pressure ring is displaced due to the extrusion of the connecting rod, the lubricating oil in the oil storage groove enters the annular groove from the oil storage groove, and can be coated on the side wall of the connecting rod to further reduce wear. At the same time, the lubricating oil infiltrates into the first bearing, which can play a lubricating role for the first bearing to further reduce the wear and displacement of the connecting rod.

[0011] As a preferred embodiment of the present utility model, an oil-absorbing cotton is placed in the oil storage groove, and a sliding rod is fixedly connected to the pressure ring. The sliding rod penetrates into the oil storage groove and is used to abut against the oil-absorbing cotton.

[0012] To achieve the above technical solution, the oil-absorbing cotton can absorb the lubricating oil for easy storage of the lubricating oil. Placing the oil-absorbing cotton in the oil storage groove can reduce the loss of the lubricating oil. When the pressure ring is subjected to the pressure of the connecting rod, the sliding rod moves synchronously with the pressure ring, so that the sliding rod squeezes the oil-absorbing cotton. The lubricating oil in the oil-absorbing cotton can be extruded and then led out from the annular groove to play a lubricating role for the connecting rod and the first bearing, reducing wear.

[0013] As a preferred embodiment of the present utility model, a conduction hole is axially formed in the sliding rod, and the conduction hole penetrates into the pressure ring. An oil outlet hole communicating with the end of the conduction hole is formed in the side wall of the pressure ring.

[0014] To achieve the above technical solution, when the sliding rod abuts against the oil-absorbing cotton, the lubricating oil in the oil-absorbing cotton can be directly led out from the oil outlet hole along the conduction hole, thereby reducing the loss of the lubricating oil on the inner wall of the annular groove and the inner wall of the oil storage groove, and improving the conduction efficiency of the lubricating oil.

[0015] As a preferred embodiment of the present utility model, a connecting net is fixedly connected to one end of the conduction hole away from the oil outlet hole. The connecting net is used to abut against the oil-absorbing cotton, and the diameter of the conduction hole near the connecting net is larger than the diameter of the conduction hole near the oil outlet hole.

[0016] To achieve the above technical solution, the connecting net abuts against the oil-absorbing cotton, increasing the deformation amount of the oil-absorbing cotton, so that the oil-absorbing cotton can extrude more lubricating oil. The lubricating oil can pass through the connecting net and enter the conduction hole.

[0017] As a preferred embodiment of the present utility model, the side wall of the pressing ring facing the connecting rod has a convex portion, and the cross-section of the convex portion is semi-circular and is used to abut against the side wall of the connecting rod.

[0018] To achieve the above technical solution, the setting of the convex portion reduces the contact area between the connecting rod and the pressing ring and reduces wear.

[0019] As a preferred embodiment of the present utility model, a keyway is provided on the left crank, the keyway is close to the end of the left crank, and a gear and a second bearing are fixedly connected to the outer wall of the left crank, and the second bearing is located between the gear and the crank pin.

[0020] To achieve the above technical solution, it is convenient to connect with other devices. Description of the Drawings

[0021] Figure 1 It is a structural schematic diagram of the embodiment;

[0022] Figure 2 It is a structural schematic diagram showing the organic friction plate;

[0023] Figure 3 It is a structural schematic diagram showing the convex portion;

[0024] Figure 4 It is a structural schematic diagram showing the sliding rod.

[0025] Reference numerals: 11, left crank; 12, right crank; 2, crank pin; 31, first bearing; 32, connecting rod; 33, left fixing hole; 34, right fixing hole; 41, keyway; 42, gear; 43, second bearing; 5, organic friction plate; 6, annular groove; 61, pressing ring; 62, convex portion; 63, elastic member; 7, oil storage groove; 71, sealing plate; 72, oil absorbing cotton; 8, sliding rod; 81, conduction hole; 82, oil outlet hole; 9, connecting net. Detailed Embodiments

[0026] The following further details the specific embodiments of the present utility model in conjunction with the drawings, so that the technical solutions of the present utility model are easier to understand and master.

[0027] A high-speed chainsaw crankshaft connecting rod 32 assembly includes a left crank 11, a right crank 12, a crank pin 2, a first bearing 31 and a connecting rod 32. Left fixing holes 33 and right fixing holes 34 are respectively provided on the left crank 11 and the right crank 12, the left fixing hole 33 and the right fixing hole 34 are coaxially arranged, and the left crank 11 and the right crank 12 are coaxially arranged. The two ends of the crank pin 2 are respectively fixed in the left fixing hole 33 and the right fixing hole 34. The connecting rod 32 is rotatably connected to the crank pin 2 through the first bearing 31.

[0028] A keyway 41 is formed on the left crank 11, and the keyway 41 is close to the end of the left crank 11. A gear 42 and a second bearing 43 are fixedly connected to the outer wall of the left crank 11, and the second bearing 43 is located between the gear 42 and the crank pin 2.

[0029] The first bearing 31 is a needle bearing, and the second bearing 43 is a ball bearing.

[0030] The organic friction plate 5 is sleeved and fixed on the crank pin 2, and the organic friction plate 5 is coaxially arranged with the crank pin 2. One organic friction plate 5 is located between the connecting rod 32 and the left crank 11, and the other organic friction plate 5 is located between the connecting rod 32 and the right crank 12.

[0031] The organic friction plate 5 is made of aramid fiber and phenolic resin, and has appropriate smoothness and wear resistance.

[0032] A ring groove 6 is formed in the organic friction plate 5, and the ring groove 6 is coaxially arranged with the organic friction plate 5. A pressure ring 61 is slidably connected in the ring groove 6. The side wall of the pressure ring 61 facing the connecting rod 32 has a convex portion 62, and the cross section of the convex portion 62 is semicircular and is used to abut against the side wall of the connecting rod 32.

[0033] An elastic member 63 is connected between the inner wall of the ring groove 6 and the pressure ring 61, and the elastic member 63 is a spring. An oil storage groove 7 communicating with the ring groove 6 is formed in the organic friction plate 5, and lubricating oil is injected into the oil storage groove 7. A sealing plate 71 is connected to the opening of the oil storage groove 7. The lubricating oil is selected as engine oil.

[0034] An oil absorption cotton 72 is placed in the oil storage groove 7, and a sliding rod 8 is fixedly connected to the side of the pressure ring 61 opposite to the convex portion 62. The sliding rod 8 penetrates into the oil storage groove 7 and is used to abut against the oil absorption cotton 72. A conduction hole 81 is axially formed in the sliding rod 8, and the conduction hole 81 penetrates into the pressure ring 61. An oil outlet hole 82 communicating with the end of the conduction hole 81 is formed in the side wall of the pressure ring 61.

[0035] A connecting net 9 is fixedly connected to the end of the conduction hole 81 far from the oil outlet hole 82, and the connecting net 9 is used to abut against the oil absorption cotton 72. The diameter of the conduction hole 81 near the connecting net 9 is larger than the diameter of the conduction hole 81 near the oil outlet hole 82.

[0036] Of course, the above are only typical examples of the present invention. In addition, the present invention can also have many other specific implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A high-speed oil saw crankshaft connecting rod assembly, comprising a left crank (11), a right crank (12), a crank pin (2), a first bearing (31) and a connecting rod (32), wherein the left crank (11) and the right crank (12) are respectively provided with a left fixing hole (33) and a right fixing hole (34), the two ends of the crank pin (2) are respectively fixed in the left fixing hole (33) and the right fixing hole (34), the connecting rod (32) is rotatably connected to the crank pin (2) through the first bearing (31), and the characteristics are: It also includes an organic friction plate (5) for contacting the side wall of the connecting rod (32), the organic friction plate (5) is sleeved and fixed on the crank pin (2), the two organic friction plates (5) are respectively located on the left and right sides of the connecting rod (32), the organic friction plate (5) is provided with an annular groove (6), a pressure ring (61) for contacting the side wall of the connecting rod (32) is slidably connected in the annular groove (6), an elastic member (63) is connected between the inner wall of the annular groove (6) and the pressure ring (61), the organic friction plate (5) is provided with an oil storage groove (7) connected to the annular groove (6), and a sealing plate (71) is connected to the opening of the oil storage groove (7).

2. The high-speed oil saw crankshaft connecting rod assembly according to claim 1, characterized in that: Oil-absorbing cotton (72) is placed in the oil storage tank (7), and a sliding rod (8) is fixedly connected to the pressure ring (61). The sliding rod (8) penetrates into the oil storage tank (7) and is used to contact the oil-absorbing cotton (72).

3. The high speed oil saw crankshaft connecting rod assembly according to claim 2, characterized in that: The slide rod (8) is provided with a conduction hole (81) along its axial direction, and the conduction hole (81) penetrates into the pressure ring (61). The side wall of the pressure ring (61) is provided with an oil outlet hole (82) connected with the end of the conduction hole (81).

4. The high-speed oil saw crankshaft connecting rod assembly according to claim 3 is characterized by: One end of the conduction hole (81) away from the oil outlet hole (82) is fixedly connected to a connection net (9), and the connection net (9) is used to contact the oil-absorbing cotton (72). The diameter of the end of the conduction hole (81) close to the connection net (9) is larger than the diameter of the end of the conduction hole (81) close to the oil outlet hole (82).

5. A high speed oil saw crankshaft connecting rod assembly according to any one of claims 1 to 4, characterized in that: The side wall of the pressure ring (61) facing the connecting rod (32) has a convex portion (62), the cross section of the convex portion (62) is semicircular and is used to abut against the side wall of the connecting rod (32).

6. The high-speed oil saw crankshaft connecting rod assembly according to claim 5, characterized in that: The left crank (11) is provided with a keyway (41), the keyway (41) is close to the end of the left crank (11), a gear (42) and a second bearing (43) are fixedly connected to the outer wall of the left crank (11), and the second bearing (43) is located between the gear (42) and the crank pin (2).

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