CN102146818A

CN102146818A - Installation structure for cam shaft and timing gear

Info

Publication number: CN102146818A
Application number: CN 201110068999
Authority: CN
Inventors: 霍英贤
Original assignee: SAIC Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2011-03-22
Filing date: 2011-03-22
Publication date: 2011-08-10
Anticipated expiration: 2031-03-22
Also published as: CN102146818B

Abstract

The invention aims to provide a durable installation structure for a cam shaft and a timing gear. The structure can position accurately and is convenient to install. The installation structure for the cam shaft and the timing gear comprises the cam shaft, the timing gear and a bolt, and is characterized in that the surface of one end part of the cam shaft is provided with radial splines; the center of the end part is provided with an axial screw hole for installing the bolt; the middle of the timing gear is provided with shaft holes, one side of the timing gear is provided with radial splines which are matched with and engaged with the splines of the cam shaft, the timing gear is fixed at the end part of the cam shaft in a tightening mode through the bolt; and the splines of the timing gear are in fit connection with the splines of the cam shaft, thus the installation is convenient and the work efficiency is improved. By using the installation structure, not only can the timing gear be positioned, but also stress generated when the timing gear and the cam shaft rotate can be dispersed, thereby eliminating stress concentration and prolonging service life.

Description

A kind of camshaft timing gear mounting structure

Technical field

The invention belongs to field of automobile, specially refer to the camshaft timing gear mounting structure of motor car engine.

Background technique

Timing gear (camshaft gear wheel and crankshaft timing gear) are cover precision gears, are used for the correct timed ignition of engine control motor.Whether accurately whether timing gear can be installed on the camshaft according to desired location, be to be related to correct timed ignition key point.At present, timing gear are to pass through positioning key with combining of camshaft in motor, promptly on camshaft front end or timing gear, be furnished with independent positioning key, during connection the positioning key correspondence is inserted into that both just are connected to together in the locating slot, but this kind is to position by independent key, around positioning key, easily produce stress and concentrate, even can cause the positioning key fracture.Also have some motors in addition, there is not locating stud between its timing gear and the camshaft, directly adopt bolt to fix assembling, assembling is more convenient like this, but bolt is tightened need very big moment, and when the motor operational shock, the bolt of fastening gear might become flexible simultaneously, deviation appears in timing, piston head valve and cause motor to be scrapped.

Summary of the invention

The objective of the invention is to propose a kind of accurate positioning, easy for installation, durable camshaft timing gear mounting structure.

Camshaft timing gear mounting structure of the present invention comprises camshaft, timing gear and bolt, and key is that the surface of described camshaft one end end is provided with spline radially, and the central authorities of end are provided with axial screw to be used to install described bolt; The middle part of described timing gear is provided with axis hole, and a side of timing gear is provided with the radial spline that matches with the camshaft spline; The spline of described timing gear is meshed with the spline of camshaft, and timing gear are fixed end in camshaft by bolt.

The spline of timing gear is connected with the spline fitted of camshaft, and is easy to assembly, improved working efficiency, not only can be used for timing gear are positioned, the stress that can also disperse timing gear and camshaft when rotating, to be produced, thus it is concentrated to eliminate stress, and increases the service life.The middle part axis hole of timing gear cooperates with bolt and can carry out radially spacingly to timing gear, prevents the timing gear radial-play.The bolt fastening of tightening is on the wheel disc of timing gear, and it is perpendicular that its sense of rotation and timing gear impose on the power of bolt, so be difficult for looseningly when vibration, guarantees that motor can normally move.

Further, a side of timing gear is provided with the boss that a middle part has circular pit, and described spline is arranged in the described pit, and the internal diameter of described pit equals or be slightly larger than the diameter of camshaft end.When mounted, the camshaft end is stretched into and is connected in the pit of timing gear, thereby timing gear is carried out radially spacing, more effectively prevents the timing gear radial-play.

Further, for avoiding bolt looseness, camshaft timing gear mounting structure of the present invention comprises that also one one side is provided with the pad of radial spline, the both sides of described timing gear are provided with radial spline, described pad is installed between timing gear and the bolt, and the spline of pad is meshed with the spline that timing gear cooperate.Pad has increased the area of contact between timing gear and the bolt, thereby has increased frictional force between the two, stops nut loosening, has also reduced the compressive load per unit area between timing gear and the bolt simultaneously, thereby protection timing gear surface is not by bolt failure.

Further, the wheel disc of described timing gear is provided with lightening hole, to alleviate overall weight, reaches automobile lightweight target.

Further, the lightening hole of described timing gear is blind hole and is crisscross arranged in the bi-side of wheel disc, so just can also guarantee the intensity of timing gear in loss of weight.

Camshaft timing gear mounting structure of the present invention positions by the radial spline on camshaft and the timing tooth road, has disperseed stress between the two, and easy for installation, and its bolt is difficult for loosening, and is therefore more durable.

Description of drawings

Fig. 1 is the overall structure schematic representation of camshaft timing gear mounting structure of the present invention.

Fig. 2 is the structural representation of the camshaft of camshaft timing gear mounting structure of the present invention.

Fig. 3 is the Facad structure schematic representation of the timing gear of camshaft timing gear mounting structure of the present invention.

Fig. 4 is the structure schematic representation of the timing gear of camshaft timing gear mounting structure of the present invention.

Fig. 5 is the side view of the timing gear of camshaft timing gear mounting structure of the present invention.

Fig. 6 is the structural representation of the pad of camshaft timing gear mounting structure of the present invention.

Embodiment

Describe the present invention in detail below in conjunction with specific embodiments and the drawings.

Embodiment 1:

As shown in Figure 1, camshaft timing gear mounting structure of the present invention comprises camshaft 1, timing gear 2 and bolt 3, pad 4, and timing gear 2 utilize bolt 3 to be installed in the end of camshaft 1, and pad 4 is installed between timing gear 2 and the bolt 3.

As shown in Figure 2, the surface of an end end of camshaft 1 is provided with spline 11 radially, and the central authorities of end are provided with axial screw 12 to be used for construction bolt 3.

Shown in Fig. 3,4,5, timing gear 2 are by wheel disc 21, and the gear teeth 22 and axis hole 23 3 parts are formed, and the peripheral disposition of wheel disc 21 has the gear teeth 22, is used for cooperating with timing chain, and wherein the quantity of the gear teeth 22 can be arranged according to actual needs.Wheel disc 21 between the gear teeth 22 and axis hole 23 is concave shape, and the lightening hole 24 of a plurality of arcs arranged on wheel disc cloth, lightening hole 24 is evenly distributed on the both sides of wheel disc 21, lightening hole 24 is the blind holes with certain degree of depth, the lightening hole 24 of wheel disc both sides intersects mutually and staggers, and has also guaranteed the intensity of gear like this in loss of weight.The front of timing gear 2 has a middle part to have the boss 26 of circular pit 25, the internal diameter of pit 25 is slightly larger than the diameter of camshaft 1 end, be provided with the radial spline 27 that matches with camshaft spline 11 in the pit 25, the back side of timing gear 2 is provided with the radial spline 28 that matches with pad spline 41.

As shown in Figure 6, a side of pad 4 is provided with radial spline 41, and the middle part of pad 4 is provided with through hole 42.

When mounted, camshaft 1 end is stretched into and is connected in the pit 21 of timing gear, timing gear 2 are carried out radial location; The spline 23 of timing gear is meshed with the spline 11 of camshaft axially to reach angular positioning, and the spline 24 of timing gear is meshed with the spline 41 of pad; Bolt 3 passes pad 4, timing gear 2 successively, so that timing gear 2 are fixed in the end of camshaft 1.

Timing gear 2 can drive camshaft 1 rotation when rotating, because of being arranged with the spline 27 of a plurality of rules on the timing tooth 2, can disperse the stress between timing gear 2 and the camshaft 1, therefore problem of stress concentration can not occur.In the present embodiment, the degree of depth of pit 21 is that the degree of depth is too little about 3mm, and boss 26 does not just have the effect of guide-localization; The degree of depth is too big, and the length of boss 26 is increased, and causes the weight of timing gear 2 to increase, and is unfavorable for loss of weight.

Claims

1. a camshaft timing gear mounting structure comprises camshaft, timing gear and bolt, and the surface that it is characterized in that described camshaft one end end is provided with spline radially, and the central authorities of end are provided with axial screw to be used to install described bolt; The middle part of described timing gear is provided with axis hole, and a side of timing gear is provided with the radial spline that matches with the camshaft spline; The spline of described timing gear is meshed with the spline of camshaft, and timing gear are fixed end in camshaft by bolt.

2. camshaft timing gear mounting structure according to claim 1, a side that it is characterized in that timing gear is provided with the boss that a middle part has circular pit, described spline is arranged in the described pit, and the internal diameter of described pit equals or be slightly larger than the diameter of camshaft end.

3. camshaft timing gear mounting structure according to claim 1 and 2 is characterized in that the wheel disc of described timing gear is provided with lightening hole.

4. camshaft timing gear mounting structure according to claim 3, the lightening hole that it is characterized in that described timing gear is blind hole and is crisscross arranged in the bi-side of wheel disc.

5. camshaft timing gear mounting structure according to claim 1 and 2, it is characterized in that also comprising that one one side is provided with the pad of radial spline, the both sides of described timing gear are provided with radial spline, described pad is installed between timing gear and the bolt, and the spline of pad is meshed with the spline that timing gear cooperate.

6. camshaft timing gear mounting structure according to claim 5 is characterized in that the wheel disc of described timing gear is provided with lightening hole.

7. camshaft timing gear mounting structure according to claim 6, the lightening hole that it is characterized in that described timing gear is blind hole and is crisscross arranged in the bi-side of wheel disc.