阅读说明：本技术 一种可调供油提前角的凸轮轴结构 (Camshaft structure capable of adjusting advance angle of oil supply ) 是由 邓雪聪 郑小华 刘宗辉 张皓钰 和晓锋 陈勇 于 2019-10-23 设计创作，主要内容包括：本发明属于柴油机技术领域,涉及一种可调供油提前角的凸轮轴结构,凸轮轴前侧的转轴上固定安装有带喷油泵的油泵凸轮,凸轮轴和正时齿轮连接的位置由两个轴径不同的轴段、一个环形槽和拆装用第一螺纹孔组成,两个轴段通过卡槽过渡；正时齿轮上设置有高压油管接口、置于重心位置的环形油槽和两个便于与凸轮轴固定的第二螺纹孔,轴段依次为第一轴段和第二轴段,靠近油泵凸轮一侧的第一轴段直径大于第二轴段,正时齿轮与第一轴段过盈配合且与第二轴段间隙配合,该凸轮轴结构实现了利用特定的凸轮轴组件结构、外接液压装置及专用工具就能完成凸轮轴组件的拆装和供油提前角的调整。(The invention belongs to the technical field of diesel engines, and relates to a camshaft structure capable of adjusting an advance angle of oil supply.A rotating shaft at the front side of a camshaft is fixedly provided with an oil pump cam with an oil injection pump, the connecting position of the camshaft and a timing gear consists of two shaft sections with different shaft diameters, an annular groove and a first threaded hole for disassembly and assembly, and the two shaft sections are transited through a clamping groove; the timing gear is provided with a high-pressure oil pipe interface, an annular oil groove arranged at the gravity center position and two second threaded holes convenient to fix with the camshaft, the shaft sections are a first shaft section and a second shaft section in sequence, the diameter of the first shaft section close to one side of the oil pump cam is larger than that of the second shaft section, the timing gear is in interference fit with the first shaft section and is in clearance fit with the second shaft section, and the camshaft structure realizes the assembly and disassembly of the camshaft assembly and the adjustment of the oil supply advance angle by utilizing a specific camshaft assembly structure, an external hydraulic device and a special tool.)

1. A camshaft structure capable of adjusting an oil supply advance angle is characterized by comprising a camshaft and a timing gear matched with the camshaft for use; an oil pump cam with an oil injection pump is fixedly mounted on a rotating shaft on the front side of the camshaft, the connecting position of the camshaft and the timing gear consists of two shaft sections with different shaft diameters, an annular groove and a first threaded hole for dismounting, and the two shaft sections are transited through a clamping groove; the timing gear is provided with a high-pressure oil pipe connector, an annular oil groove arranged at the gravity center position and two second threaded holes convenient to fix with the camshaft, the shaft section is a first shaft section and a second shaft section in sequence, the diameter of the first shaft section close to one side of the oil pump cam is larger than that of the second shaft section, and the timing gear is in interference fit with the first shaft section and is in clearance fit with the second shaft section.

2. The camshaft structure with the adjustable oil supply advance angle according to claim 1, wherein a high-pressure oil pipe with high-pressure oil is detachably connected to the high-pressure oil pipe interface.

3. The camshaft structure with the adjustable oil supply advance angle as claimed in claim 2, further comprising a pressing sleeve pressed at the rear end of the camshaft during adjustment of the oil supply advance angle, wherein the pressing sleeve, the first threaded hole and the second threaded hole are inserted with appropriate bolts to fix the pressing sleeve, the camshaft and the timing gear.

4. The camshaft structure with the adjustable oil supply advance angle as claimed in claim 3, wherein the bolts in the pressing sleeve, the first threaded hole and the second threaded hole are threadedly connected with adjusting nuts for adjusting tightness degree of the pressing sleeve and the camshaft.

5. The camshaft structure with the adjustable advance angle of oil supply according to claim 4, wherein an O-ring is fitted in the annular oil groove.

6. The camshaft structure with the adjustable oil supply advance angle as claimed in claim 2, wherein when the timing gear is disassembled, the camshaft structure further comprises a pulling block fixed at the rear part of the timing gear and a bolt for fixing the pulling block and the timing gear, and the bolt is also fixedly installed in the middle of the pulling block.

7. The adjustable oil advance camshaft structure as claimed in claim 6, further comprising a spacer caught in the first threaded hole.

Technical Field

The invention belongs to the technical field of diesel engine assembly, adjustment and equipment maintenance, and relates to a camshaft structure capable of adjusting an oil supply advance angle.

Background

With the rapid development of economic construction, diesel engines are more and more widely applied to various fields of economic construction such as automobiles, engineering machinery, ships and power generation with the advantages of large power range, good economy, high reliability and the like. The advance oil supply angle of the diesel engine is used for better atomizing fuel oil, and the overlarge or undersize advance oil supply angle has great influence on the dynamic property and the economical property of the diesel engine.

In the process of developing the diesel engine, in order to meet the performance requirement of the diesel engine, the advance angle of oil supply needs to be continuously adjusted. The diesel engine has different fuel supply advance angles under different working conditions, and the fuel supply advance angle needs to be adjusted. The higher the rotation speed of the diesel engine, the larger the fuel supply advance angle is required; the lower the rotation speed, the smaller the fuel supply advance angle is required, so that the diesel engine has the best dynamic property and economical efficiency.

The method for adjusting the advance angle of the oil supply of the diesel engine is shown in figure 1: the timing gear (I) is connected with the camshaft (II) through a bolt (III), an oil pump cam (IV) on the camshaft (II) drives an oil injection pump (V) to realize oil injection, and the adjustment of an oil supply advance angle is realized by changing the thickness of an adjusting gasket (VI). This way of adjustment presents two problems:

1. the camshaft and the timing gear are connected through a bolt, the relative position relation of the camshaft and the timing gear is fixed and unadjustable, and the oil supply advance angle cannot be adjusted by adjusting the relative position relation of the camshaft and the timing gear.

2. The oil supply advance angle is adjusted by changing the thickness of the adjusting shim, and the oil injection pump of each cylinder and accessories connected with the oil injection pump are required to be detached for grinding and replacing the adjusting shim, so that the workload is high, the time and the labor are wasted, and the efficiency is low.

Disclosure of Invention

In view of this, the present invention provides a camshaft structure capable of adjusting an oil supply advance angle to solve the above problems in the oil supply advance angle adjusting process.

In order to achieve the aim, the invention provides a camshaft structure with an adjustable oil supply advance angle, which comprises a camshaft and a timing gear matched with the camshaft for use; an oil pump cam with an oil injection pump is fixedly mounted on a rotating shaft on the front side of the camshaft, the connecting position of the camshaft and the timing gear consists of two shaft sections with different shaft diameters, an annular groove and a first threaded hole for dismounting, and the two shaft sections are transited through a clamping groove; the timing gear is provided with a high-pressure oil pipe connector, an annular oil groove arranged at the gravity center position and two second threaded holes convenient to fix with the camshaft, the shaft section is sequentially a first shaft section and a second shaft section, the diameter of the first shaft section close to one side of the oil pump cam is larger than that of the second shaft section, and the timing gear is in interference fit with the first shaft section and is in clearance fit with the second shaft section.

Furthermore, a high-pressure oil pipe with high-pressure oil is detachably connected to the high-pressure oil pipe interface.

Furthermore, when the oil supply advance angle is adjusted, the oil supply advance angle adjusting device further comprises a pressing sleeve pressed at the rear end of the camshaft, and proper bolts are inserted into the pressing sleeve, the first threaded hole and the second threaded hole to fix the pressing sleeve, the camshaft and the timing gear.

Furthermore, the bolts in the pressing sleeve, the first threaded hole and the second threaded hole are in threaded connection with adjusting nuts used for adjusting the tightness degree of the pressing sleeve and the camshaft.

Furthermore, an O-shaped sealing ring is assembled in the annular oil groove.

Furthermore, when the timing gear is disassembled, the timing gear disassembling device further comprises a pulling block fixed at the rear part of the timing gear and a bolt used for fixing the pulling block and the timing gear, and the middle part of the pulling block is also fixedly provided with the bolt.

Further, the screw thread structure also comprises a cushion block clamped in the first screw thread hole.

The invention has the beneficial effects that:

1. the invention discloses a camshaft structure capable of adjusting an oil supply advance angle, which is characterized in that when the oil supply advance angle needs to be adjusted, a camshaft is fixed through a pressing sleeve, a high-pressure oil pipe interface on a timing gear is connected with high-pressure oil, the high-pressure oil pipe interface is rotated to a required crankshaft rotation angle through rotating a flywheel linked with the timing gear, the high-pressure oil is removed, an O-shaped sealing ring, a pressing sleeve, an adjusting nut and a bolt are removed, the adjustment of the oil supply advance angle is completed, the connection of the camshaft and the timing gear is realized by the whole camshaft structure through interference fit, the adjustment of the oil supply advance angle is realized by utilizing the camshaft and the timing gear of a specific structure, and the camshaft structure is a specific connecting structure of the camshaft and the timing gear, and the.

2. According to the camshaft structure with the adjustable oil supply advance angle, when the timing gear is disassembled, the O-shaped sealing ring, the cushion block, the pulling block and the bolt for fixing the pulling block and the timing gear are sequentially installed, the timing gear is connected with high-pressure oil, the bolt in the middle of the pulling block is screwed to enable the timing gear to move in the direction far away from the camshaft, when the timing gear is withdrawn from the shaft section, the high-pressure oil is removed, the camshaft and the timing gear are disassembled, and the disassembly is completed. The disassembly and assembly of the camshaft assembly and the adjustment of the oil supply advance angle are realized by utilizing a specific camshaft assembly structure, an external hydraulic device and a special tool; the automatic feeding device has the advantages of reducing a large amount of work, improving the working efficiency, being simple in structure, low in cost, convenient to operate and the like.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is an assembly view of a timing gear and camshaft of the prior art;

FIG. 2 is an assembly view of the timing gear and camshaft of the present invention;

FIG. 3 is a schematic structural view of a camshaft according to the present invention;

FIG. 4 is a schematic view of the timing gear of the present invention;

FIG. 5 is a schematic view of a mounting structure of a pressing sleeve during adjustment of an advance angle of oil supply according to the present invention;

FIG. 6 is a diagram showing a camshaft structure during adjustment of the advance angle of oil supply according to the present invention;

FIG. 7 is a state diagram of the camshaft structure with the timing gear removed in accordance with the present invention.

Reference numerals: the oil injection timing structure comprises a camshaft 1, an annular groove 11, a first threaded hole 12, a first shaft section 13, a second shaft section 14, a clamping groove 15, a timing gear 2, a high-pressure oil pipe connector 21, an annular oil groove 22, a second threaded hole 23, a sealing ring 3, a pressing sleeve 4, an adjusting nut 5, a bolt 6, an oil pump cam 7, an oil injection pump 8, a pull block 9 and a cushion block 10.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

The fuel supply advance angle in the patent refers to the crank angle of the piston from the top dead center when the fuel injector starts to inject fuel.

The interference fit is a fit in which the difference between the size of the hole minus the size of the mating shaft is negative, and the surface of the part is elastically pressed after assembly, thereby obtaining a tight connection.

The camshaft structure with the adjustable oil supply advance angle as shown in fig. 2-7 comprises a camshaft 1 and a timing gear 2 matched with the camshaft 1; an oil pump cam 7 with an oil injection pump 8 is fixedly arranged on a rotating shaft on the front side of the camshaft 1, the connecting position of the camshaft 1 and the timing gear 2 consists of two shaft sections with different shaft diameters, an annular groove 11 and a first threaded hole 12 for dismounting, and the two shaft sections are transited through a clamping groove 15; the timing gear 2 is provided with a high-pressure oil pipe interface 21, an annular oil groove 22 arranged at the gravity center position and two second threaded holes 23 convenient for being fixed with the camshaft 1, and the high-pressure oil pipe with high-pressure oil is detachably connected to the high-pressure oil pipe interface 21. The shaft sections are a first shaft section 13 and a second shaft section 14 in sequence, the diameter of the first shaft section 13 close to one side of the oil pump cam 7 is larger than that of the second shaft section 14, and the timing gear 2 is in interference fit with the first shaft section 13 and is in clearance fit with the second shaft section 14.

When the oil supply advance angle is adjusted, the device also comprises a pressing sleeve 4 pressed at the rear end of the camshaft 1, and proper bolts 6 are inserted into the pressing sleeve 4, the first threaded hole 12 and the second threaded hole 23 to fix the pressing sleeve 4, the camshaft 1 and the timing gear 2. An O-shaped sealing ring 3 is assembled in the annular oil groove 22. And adjusting nuts 5 used for adjusting the tightness degree of the pressing sleeve 4 and the camshaft 1 are connected on the bolts 6 in the pressing sleeve 4, the first threaded hole 12 and the second threaded hole 23 in a threaded manner.

When the advance angle of oil supply needs to be adjusted, firstly, the O-shaped sealing ring 3 is arranged in the annular groove 11, high-pressure oil is accessed to the high-pressure oil pipe interface 21 of the timing gear 2, simultaneously, the nut is screwed to lead the timing gear 2 to move towards the direction close to the camshaft 1 until the pressing sleeve 4 is contacted with the end surface of the camshaft 1, then the flywheel linked with the timing gear 2 is rotated to a required crank angle, high pressure oil is discharged, the O-shaped sealing ring 3, the pressing sleeve 4, the adjusting nut 5 and the bolt 6 are detached to complete adjustment of the oil supply advance angle, the whole camshaft 1 structure utilizes interference fit to realize connection of the camshaft 1 and the timing gear 2, and the camshaft 1 and the timing gear 2 with specific structures are utilized to realize adjustment of the oil supply advance angle, so that the structure is a specific connecting structure of the camshaft 1 and the timing gear 2, and the oil supply advance angle can be conveniently and quickly adjusted.

When the timing gear 2 is disassembled, the timing gear further comprises a pulling block 9 fixed at the rear part of the timing gear 2 and a bolt 6 used for fixing the pulling block 9 and the timing gear 2, and the bolt 6 is also fixedly installed in the middle of the pulling block 9. The first threaded hole 12 is internally provided with a cushion block 10.

When the timing gear 2 is disassembled, the O-shaped sealing rings 3 are sequentially arranged in the annular grooves 11, the cushion blocks 10 are inserted into the first threaded holes 12, the pulling blocks 9 are fixed on the timing gear 2 through the bolts 6, the timing gear 2 is connected with high-pressure oil, the bolts 6 in the middle of the pulling blocks 9 are screwed to enable the timing gear 2 to move towards the direction far away from the camshaft 1, when the timing gear 2 is withdrawn from the shaft section, the high-pressure oil is removed, the camshaft 1 and the timing gear 2 are disassembled, and the disassembly is completed. The disassembly and assembly of the camshaft 1 and the timing gear 2 are realized by using a hydraulic device and a special tool, and the disassembly and assembly of the camshaft 1 assembly and the adjustment of the oil supply advance angle are realized by using a specific camshaft 1 assembly structure, an external hydraulic device and a special tool; the automatic feeding device has the advantages of reducing a large amount of work, improving the working efficiency, being simple in structure, low in cost, convenient to operate and the like.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.