Novel combined camshaft of single-cylinder motorcycle engine

Abstract

The utility model discloses a novel combined camshaft of a single-cylinder motorcycle engine, and relates to the technical field of engine parts. The transmission shaft is fixedly connected with a limiting ring, the left side of the limiting ring is provided with a timing chain wheel, the right side of the limiting ring is provided with two connecting rings, the connecting rings are fixedly connected with cams, the transmission shaft is sleeved with two positioning bushings, the positioning bushings are sleeved with retainer needle bearings, and the retainer needle bearings are sleeved with outer protective bushings. When the rolling bearing is used, the outer side wall of the outer protective bush abuts against the wall of a tilting fillet of an engine cylinder head, meanwhile, due to the arrangement of the retainer needle bearing on the inner side of the outer protective bush, friction resistance between the transmission shaft and the engine cylinder head during operation is greatly reduced, and when an engine is started or engine oil pressure is insufficient, the rolling bearing for the cylinder head is more wear-resistant than a sliding bearing; therefore, advanced damage of the cylinder head cam shaft neck and the cylinder head bearing seat is avoided, abrasion of parts is reduced, and operation efficiency is improved at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine parts, especially to a novel combined camshaft of a single-cylinder motorcycle engine. BACKGROUND

[0002] In a traditional single-cylinder motorcycle four-valve engine, the camshaft is an indispensable key component. The camshaft usually has a timing chain wheel set on it, which is used to transmit power and control the opening and closing of the valves. However, this design has a significant flaw: since the timing chain wheel is located on one side of the camshaft, when the chain wheel rotates, it will generate a downward deflection torque on the camshaft, causing the end of the camshaft away from the timing chain wheel to be subjected to a reverse force.

[0003] This reverse force adds to the force of the camshaft opening the valve spring, not only intensifying the friction and wear between the camshaft and the engine cylinder head bearing, shortening the service life of the equipment, but also destroying the oil film lubrication between the camshaft and the cover, increasing the power consumption of the engine. The destruction of the oil film makes the contact between the camshaft and the cover more direct and rough, further accelerating the wear process, and possibly leading to a decrease in engine performance and an increase in fuel consumption.

[0004] Therefore, the present application proposes a novel combined camshaft of a single-cylinder motorcycle engine to solve the above problems. SUMMARY

[0005] The utility model aims at providing a novel combined camshaft of a single-cylinder motorcycle engine, which solves the technical problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a novel combined camshaft of a single-cylinder motorcycle engine, comprising a transmission shaft, a limiting ring is fixedly connected on the transmission shaft, a timing chain wheel is arranged on the left side of the limiting ring, two connecting rings are arranged on the right side of the limiting ring, a cam is fixedly connected on the connecting ring, a key groove one and a key groove two are set on the transmission shaft, the key groove one and the key groove two are respectively located on the left and right sides of the limiting ring, a connecting hole is set on the timing chain wheel, a key groove three is set on the inner side wall of the connecting hole, a key groove four is set on the inner side wall of the connecting ring, a flat key one is arranged on the inner side of the key groove three, the key groove one and the key groove three are matched with the flat key one, a flat key two is arranged on the inner side of the key groove four, the key groove two and the key groove four are matched with the flat key two, a connecting bolt one and a connecting bolt two are respectively arranged on the left and right sides of the transmission shaft, one end of the connecting bolt one and the connecting bolt two close to the transmission shaft is respectively threadedly connected with the left and right ends of the transmission shaft.

[0007] Preferably, two positioning bushings are sleeved on the transmission shaft, left ends of the left positioning bushing abut against the left connecting ring and the left side wall of the limiting ring, and right ends of the right positioning bushing abut against the right side wall of the right connecting ring and the right connecting ring.

[0008] Preferably, a retainer needle bearing is sleeved on the positioning bushing, and an outer protective bushing is sleeved on the retainer needle bearing.

[0009] Preferably, an oil inlet hole is formed in the left outer protective bushing.

[0010] Preferably, the length of the right outer protective bushing is less than the length of the retainer needle bearing.

[0011] Compared with the related art, the single-cylinder motorcycle engine novel combined camshaft has the following beneficial effects:

[0012] 1. The single-cylinder motorcycle engine novel combined camshaft has the following beneficial effects: the outer protective bushing is arranged on the outside of the retainer needle bearing, and the outer side wall of the outer protective bushing abuts against the cylinder head tile seat wall, and the retainer needle bearing on the inside of the outer protective bushing is in rolling friction, so that the frictional resistance between the transmission shaft and the cylinder head during operation is greatly reduced; the rolling bearing is used in the cylinder head, so that the rolling bearing does not need a pressure oil passage and only needs splash lubrication, which avoids the premature damage of the cylinder head camshaft journal and the cylinder head bearing seat, reduces the wear of parts, improves the operation efficiency, ensures that the transmission shaft can remain stable during high-speed operation, and reduces the power consumption of the engine.

[0013] 2. The single-cylinder motorcycle engine novel combined camshaft has the following beneficial effects: the position of the time rule sprocket and the two cams is limited by the two positioning bushings and the two connecting bolts, and the synchronous rotation of the time rule sprocket, the transmission shaft and the cams is ensured under the action of the two keys; and all parts in the structure can be disassembled, so that the maintenance difficulty and cost are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a perspective structural schematic view of the utility model;

[0015] Figure 2 is another angle perspective structural schematic view of the utility model;

[0016] Figure 3 is an exploded structural schematic view of the utility model;

[0017] Figure 4 It is the transmission shaft position structure display schematic view of the utility model;

[0018] Figure 5 It is the cam position structure schematic view of the utility model;

[0019] Figure 6 It is the cage needle bearing position three-dimensional structure schematic view of the utility model.

[0020] In the drawing: 1, transmission shaft; 2, limit ring; 3, keyway one; 4, keyway two; 5, time rule sprocket; 6, keyway three; 7, flat key one; 8, connecting bolt one; 9, connecting ring; 10, cam; 11, flat key two; 12, connecting bolt two; 13, positioning bush; 14, cage needle bearing; 15, outer protective bush; 16, oil inlet hole; 17, keyway four; 18, connecting hole. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0022] Please refer to Figures 1-6The utility model provides a technical scheme: Single cylinder motorcycle engine novel combined type camshaft, including transmission shaft 1, fixedly connected with the limit ring 2 on transmission shaft 1, the left side of limit ring 2 is provided with time rule sprocket 5, the right side of limit ring 2 is provided with two connecting rings 9, and the fixed connection has cam 10 on connecting ring 9, and the keyway one 3 and the keyway two 4 are seted up on transmission shaft 1, and the keyway one 3 and the keyway two 4 are located at the left and right sides of limit ring 2 respectively, and the connecting hole 18 is seted up on time rule sprocket 5, and the keyway three 6 is seted up on the inner side wall of connecting hole 18, and the keyway four 17 is seted up on the inner side wall of connecting ring 9, and the inner side of keyway three 6 is provided with the key one 7, and the keyway one 3 and the keyway three 6 are adapted with the key one 7, and the inner side of keyway four 17 is provided with the key two 11, and the keyway two 4 and the keyway four 17 are adapted with the key two 11, and the connecting bolt one 8 and the connecting bolt two 12 are seted up on the left and right sides of transmission shaft 1 respectively, and the left and right ends of transmission shaft 1 are respectively connected with the left and right ends of transmission shaft 1 on the one end close to transmission shaft 1 of connecting bolt one 8 and connecting bolt two 12, and the position of time rule sprocket 5 and two cams 10 is limited by the left and right connecting bolt one 8, connecting bolt two 12 and two positioning bushings 13, and the stability in the working process of equipment is guaranteed, and the synchronous rotation of time rule sprocket 5, transmission shaft 1 and cam 10 is guaranteed under the action of key one 7 and key two 11, and all parts in the structure can be detached, and when part of parts fails, it can be replaced at any time, and the maintenance difficulty and cost are reduced,

[0023] The two positioning bushings 13 are sleeved on transmission shaft 1, the left ends of left positioning bushing 13 and right positioning bushing 13 are respectively abutted with the adjacent side wall of limit ring 2 and left connecting ring 9, and the right ends of left positioning bushing 13 and right positioning bushing 13 are respectively abutted with the adjacent side wall of left and right two connecting rings 9, and the distance position between limit ring 2 and two cams 10 is limited by the setting of positioning bushing 13, and when using, cage needle bearing 14 is matched with positioning bushing 13, thereby reducing the abrasion of transmission shaft 12,

[0024] The cage needle bearing 14 is sleeved on the positioning bushing 13, and the outer protective bushing 15 is sleeved on the cage needle bearing 14, the oil inlet hole 16 is formed in the left outer protective bushing 15, and the length of the right outer protective bushing 15 is less than the length of the cage needle bearing 14, in the using process, the lubricating oil in the engine enters the cage needle bearing 14 from the oil inlet hole 16 and the gap between the outer protective bushing 15 and the cage needle bearing 14, thereby guaranteeing the lubrication of the bearing, avoiding the overheating and abnormal wear of the bearing, and causing the performance decline of the bearing.

[0025] Working principle: the use of both sides of the connecting bolt 8, connecting bolt 12 and two positioning bushing 13 on the position of the time scale sprocket 5 and two cam 10 limit, ensure the stability of the device during operation; at the same time in the effect of the key 7 and key 11 to ensure the synchronous rotation of the time scale sprocket 5, transmission shaft 1 and cam 10; in use, the outer wall of the outer protective bushing 15 and engine cylinder head tile seat wall abutment, at the same time the inner side of the outer protective bushing 15 cage needle bearing 14 belongs to the rolling friction relationship, greatly reduces the transmission shaft 1 and the engine cylinder head between the friction resistance, when the engine starts or oil pressure is not enough, cylinder head with rolling bearing than sliding bearing wear, because the rolling bearing does not need pressure oil channel operation, only need to splash lubrication can, this avoids the cylinder head cam 10 shaft neck and cylinder head bearing seat in advance damage, in reducing the wear of parts at the same time improves the running efficiency, so that the transmission shaft 1 in high speed operation can still keep stable, reduce the power consumption of the engine.

Claims

1. A new combined camshaft for single cylinder motorcycle engine comprising a transmission shaft (1) characterized in that: The transmission shaft (1) is fixedly connected with a limiting ring (2), the left side of the limiting ring (2) is provided with a time chain wheel (5), the right side of the limiting ring (2) is provided with two connecting rings (9), the connecting rings (9) are fixedly connected with cams (10), the transmission shaft (1) is provided with a key groove one (3) and a key groove two (4), the key groove one (3) and the key groove two (4) are located on the left and right sides of the limiting ring (2), the time chain wheel (5) is provided with a connecting hole (18), the inner side wall of the connecting hole (18) is provided with a key groove three (6), the inner side wall of the connecting ring (9) is provided with a key groove four (17), the inner side of the key groove three (6) is provided with a flat key one (7), the key groove one (3) and the key groove three (6) are matched with the flat key one (7), the inner side of the key groove four (17) is provided with a flat key two (11), the key groove two (4) and the key groove four (17) are matched with the flat key two (11), the left and right sides of the transmission shaft (1) are provided with connecting bolts one (8) and connecting bolts two (12), the ends of the connecting bolts one (8) and the connecting bolts two (12) close to the transmission shaft (1) are threadedly connected with the left and right ends of the transmission shaft (1).

2. The new combined camshaft of single cylinder motorcycle engine as claimed in claim 1 wherein: The transmission shaft (1) is provided with two positioning bushings (13), the left and right ends of the left positioning bushing (13) are abutted with the adjacent side walls of the limiting ring (2) and the left connecting ring (9), and the left and right ends of the right positioning bushing (13) are abutted with the adjacent side walls of the left and right connecting rings (9).

3. The new combined camshaft of single cylinder motorcycle engine as claimed in claim 2 wherein: The positioning bushing (13) is provided with a retainer needle bearing (14), and the retainer needle bearing (14) is provided with an outer protective bushing (15).

4. The new combined camshaft of single cylinder motorcycle engine as claimed in claim 3 wherein: The left outer protective bushing (15) is provided with an oil inlet hole (16).

5. The new combined camshaft of single cylinder motorcycle engine as claimed in claim 3 wherein: The length of the right outer protective bushing (15) is less than the length of the retainer needle bearing (14).

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