阅读说明：本技术 一种平衡轴与机油泵分装工具及间隙调整方法 (Balance shaft and oil pump subpackaging tool and gap adjusting method ) 是由 李策策 刘俊强 董乐 王乐 陈德春 贾延君 王铁柱 孙羽 陈渤桐 张建峰 于 2021-06-24 设计创作，主要内容包括：本发明涉及发动机装配和调整工具,涉及一种平衡轴与机油泵分装工具及间隙调整方法,包括底板和设置在底板上的压紧机构、二级调整机构、复位机构；压紧机构包括压头基体、压紧凸轮、连接销、丝杆、复位弹簧、导向套和锁止套；二级调整机构包括二级调整本体、滑块、导向销、顶进丝杆、限位丝杆；复位机构包括传力套、推力弹簧和丝堵；本发明可以由一个操作者独立完成平衡轴与机油泵的间隙调整；可以快速固定平衡轴与机油泵分总成；可以保证调节间隙的一致性；可以保证退回的间隙为0.10mm；特别适用于新产品的试制生产,尤其是小批量的试制生产。(The invention relates to an engine assembling and adjusting tool, in particular to a balance shaft and oil pump subpackaging tool and a gap adjusting method, which comprise a bottom plate, and a pressing mechanism, a secondary adjusting mechanism and a resetting mechanism which are arranged on the bottom plate; the pressing mechanism comprises a pressing head base body, a pressing cam, a connecting pin, a screw rod, a return spring, a guide sleeve and a locking sleeve; the secondary adjusting mechanism comprises a secondary adjusting body, a sliding block, a guide pin, a jacking screw rod and a limiting screw rod; the reset mechanism comprises a force transmission sleeve, a thrust spring and a plug; the invention can independently complete the gap adjustment between the balance shaft and the oil pump by an operator; the balance shaft and the oil pump sub-assembly can be quickly fixed; the consistency of the adjusting clearance can be ensured; the clearance for withdrawing can be ensured to be 0.10 mm; is particularly suitable for trial production of new products, especially for trial production of small batches.)

1. The utility model provides a balanced axle and partial shipment instrument of oil pump which characterized in that: comprises a bottom plate (1), and a pressing mechanism (2), a secondary adjusting mechanism (3) and a resetting mechanism (4) which are arranged on the bottom plate (1).

2. The balance shaft and oil pump split charging tool of claim 1, wherein:

the pressing mechanism (2) is in threaded connection with the bottom plate (1) through the outer bottom of the guide sleeve (25);

three pressing mechanisms (2) are arranged;

the secondary adjusting mechanism (3) is connected with a threaded hole in the bottom plate (1) through a bottom mounting hole;

the resetting mechanism (4) is positioned at the guide hole (11) of the bottom plate.

3. The balance shaft and oil pump split charging tool according to claim 1 or 2, characterized in that:

the pressing mechanism (2) comprises a pressing head base body (21), a pressing cam (22), a connecting pin (24), a screw rod (23), a return spring (28), a guide sleeve (25) and a locking sleeve (26);

the pressing cam (22) comprises a force adding arm (222) and a cam (221) which are integrally arranged;

the pressure head base body (21) comprises a cantilever (211) and a guide rod (212) which are integrally arranged, one end of the cantilever (211) far away from the guide rod (212) is in threaded connection with an adjusting pressure head (27), the cam (221) is hinged with the screw rod (23), and an included angle between a force applying arm (222) and the upper end face of the cantilever (211) is 0-45 degrees;

the guide rod (212) penetrates through the guide sleeve (25);

the screw rod (23) axially penetrates through the middle part of the guide rod (212), and the lower part of the screw rod (23) is in threaded connection with the inner bottom of the guide sleeve (25);

a return spring (28) is arranged between the guide sleeve (25) and the guide rod (212), threads are arranged at the outer bottom of the guide sleeve (25), and a locking sleeve (26) is arranged at the outer bottom of the guide sleeve (25) in a threaded manner.

4. The balance shaft and oil pump split charging tool of claim 3, wherein:

the secondary adjusting mechanism (3) comprises a secondary adjusting body (31), a sliding block (32), a guide pin (35), a jacking screw rod (33) and a limiting screw rod (34);

the secondary adjusting body (31) comprises a limiting groove (37) and an avoiding groove (38) which are integrally arranged;

the sliding block (32) comprises a threaded hole in the middle and guide pin holes at two ends, the sliding block (32) is arranged in the limiting groove (37), and the two guide pins (35) penetrate through the guide pin holes of the secondary adjusting body (31) and are hinged with the guide pin holes of the sliding block;

the jacking screw rod (33) is connected through a threaded hole in the middle of the sliding block (32), and the two limiting screw rods (34) are arranged in threaded holes of the secondary adjusting body (31).

5. The balance shaft and oil pump split charging tool of claim 4, wherein:

the reset mechanism (4) comprises a force transmission sleeve (41), a thrust spring (42) and a plug (43);

the force transmission sleeve (41) slides along the guide hole (11), the plug (43) is installed at the bottom of the guide hole (11), and the thrust spring device (42) is arranged between the force transmission sleeve (41) and the plug (43).

6. The balance shaft and oil pump split charging tool of claim 4, wherein:

the clearance between the sliding block (32) and the limiting groove (37) is 0.10 mm.

7. The balance shaft and oil pump split charging tool of claim 2, wherein:

the guide hole (11) is a stepped hole, and the upper part of the guide hole (11) is small in aperture and plays a limiting role.

8. The balance shaft and oil pump split charging tool according to claim 1 or 2, characterized in that:

the bottom plate (1) is provided with two positioning holes for mounting the positioning pins (5); and the bottom plate (1) is also provided with threaded holes which are respectively used for installing the pressing mechanism (2) and the secondary adjusting mechanism (3).

9. The balance shaft and oil pump split charging tool of claim 3, wherein:

a locking plane is arranged at the top end of the cam (221) so as to realize compression and locking;

the guide rod (212) penetrates through the guide sleeve (25), can slide up and down and can rotate 360 degrees.

10. A method and apparatus for gap adjustment using the balance shaft and oil pump split charging tool of claim 5, comprising:

installing a positioning ring at a positioning hole I (63) at the rear end of the shell of the balance shaft (6), slightly meshing and aligning an oil pump power gear (71) and a driving gear (61) at the rear end of the balance shaft, then inserting the oil pump power gear into the positioning hole I, and aligning a positioning hole II (72) at the front end surface of an oil pump (7) to the positioning ring at the rear end of the shell of the balance shaft (6) for installation;

the balance shaft (5) and the oil pump (6) are separately assembled together, a connecting bolt is used for connecting a pre-tightening bolt hole (81), and the connecting bolt is pre-tightened to be 1 NM;

aligning a positioning hole at the bottom of the balance shaft (6) with a positioning pin (5) on the bottom plate (1), and installing a sub-assembly (8) of the balance shaft and the oil pump on the bottom plate (1);

a pressing mechanism (2) is used for pressing the balance shaft and the oil pump sub-assembly (8);

screwing the limit screw rod (34) to push the sliding block (32) to advance without clearance, screwing the jacking screw rod (33) to push a small platform of a shell of the oil pump (7), enabling the oil pump (7) to rotate clockwise, and simultaneously using a torque wrench to rotate a driving shaft (62) to measure the rotation torque of the balance shaft (6) until the torque is 0.5NM, wherein the gear meshing clearance between the two is zero;

the limit screw rod (34) is loosened, and the oil pump (7) rotates anticlockwise under the action of the reset mechanism (4);

the clearance between the sliding block (32) and the limiting groove (37) ensures that the sliding block retracts by 0.10 mm;

the tightening torque of the connecting bolt is 10 +/-2 NM;

the balance shaft driving shaft (62) is rotated to confirm whether the balance shaft driving shaft is qualified or not, and the whole adjusting process can be independently completed by one operator.

Technical Field

The invention relates to an engine assembling and adjusting tool, in particular to a balance shaft and oil pump subpackaging tool and a clearance adjusting method, and particularly relates to a balance shaft and oil pump assembling and gear meshing clearance adjusting tool.

Background

The oil pump belongs to an engine lubricating system and is arranged at the rear end of the balance shaft. The rear end of the balance shaft is provided with a driving gear, and the oil pump is driven by the meshing of the driving gear and the power gear of the oil pump. The meshing clearance between the driving gear at the rear end of the balance shaft and the power gear of the oil pump is required to be 0.10 mm.

When the balance shaft and the oil pump are separately assembled, firstly, a positioning ring is arranged at the rear end of a balance shaft shell, then, the balance shaft and the oil pump are separately assembled together, three connecting bolts are used for connecting, the connecting bolts are pre-tightened by 1NM, and a sub-assembly of the balance shaft and the oil pump is fixed on the lower surface of a cylinder body.

The following describes a method for adjusting the engagement gap between the balance shaft and the oil pump in the prior art. And fixing the auxiliary pressing tool at the corresponding position of the lower surface of the cylinder body, and pressing the small platform of the oil pump shell by using a jacking bolt of the auxiliary pressing tool. And fixing the dial indicator on the side surface of the cylinder body, so that the thimble of the dial indicator is compressed on the shell of the oil pump shell, and selecting a surface which is approximately parallel to the small platform of the oil pump shell at the position.

And rotating the jacking screw rod to enable the oil pump to rotate clockwise, and measuring the rotation torque of the balance shaft by using a torque wrench until the torque is 0.5NM, wherein the meshing clearance between the two gears is zero. And then, a crowbar is used for pushing the plane at the lower right side of the engine oil pump shell, simultaneously, a jacking bolt of the auxiliary pressing tool is loosened, the engine oil pump rotates anticlockwise, the engine oil pump shell is measured to return 0.10mm by a dial indicator, so that the meshing between the balance shaft driving gear and the engine oil pump power gear is ensured to be 0.10mm, and the engine oil pump is kept at the position. The remaining 4 tie bolts were installed and a total of 7 tie bolts were torque tightened to (10 ± 2) NM. And rotating the balance shaft to determine whether the balance shaft is qualified.

The above method has the following disadvantages: the method needs two persons for matching operation, needs more auxiliary tools for installation and is complicated to operate. Because the design requirement clearance is only 0.10mm, use the crowbar to promote the plane of machine oil pump casing right below, loosen the jacking bolt that assists the frock of compressing tightly simultaneously, make the anticlockwise rotation of oil pump, go on hardly simultaneously to the power of prizing can make the machine oil pump casing produce elastic deformation greatly, can't guarantee that the clearance after the adjustment is 0.10 mm. The consistency of the individual adjustments cannot be guaranteed.

The technical scheme of the invention is that a balance shaft and an oil pump sub-assembly are quickly fixed through a pressing mechanism; the spring is reset, so that the consistency of reset force is ensured, and the consistency of adjusting gaps is indirectly ensured; and the two-stage adjusting mechanism realizes the purpose of pushing the oil pump to rotate clockwise and ensures the return of 0.10 mm.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the problems in the prior art and provides a balance shaft and oil pump subpackaging tool and a gap adjusting method.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

In order to solve the technical problems, the invention is realized by adopting the following technical scheme:

by adopting the pressing mechanism, the secondary adjusting mechanism and the resetting mechanism, the invention ensures that the gap between the balance shaft and the oil pump is adjusted simply and easily, the adjusted gap is ensured to be consistent, and the return gap is ensured to be 0.10 mm.

A split charging tool for a balance shaft and an oil pump comprises a bottom plate 1, and a pressing mechanism 2, a secondary adjusting mechanism 3 and a resetting mechanism 4 which are arranged on the bottom plate 1.

Further, the pressing mechanism 2 is in threaded connection with the bottom plate 1 through the outer bottom of the guide sleeve 25;

three pressing mechanisms 2 are arranged;

the secondary adjusting mechanism 3 is connected with a threaded hole in the bottom plate 1 through a bottom mounting hole;

the reset mechanism 4 is positioned at the bottom plate guide hole 11.

Further, the pressing mechanism 2 comprises a pressing head base body 21, a pressing cam 22, a connecting pin 24, a screw rod 23, a return spring 28, a guide sleeve 25 and a locking sleeve 26;

the pressing cam 22 comprises a force adding arm 222 and a cam 221 which are integrally arranged;

the pressure head base body 21 comprises a cantilever 211 and a guide rod 212 which are integrally arranged, one end of the cantilever 211 far away from the guide rod 212 is in threaded connection with an adjusting pressure head 27, the cam 221 is hinged with the screw rod 23, and an included angle between a force adding arm 222 and the upper end face of the cantilever 211 is 0-45 degrees;

the guide rod 212 penetrates through the guide sleeve 25;

the screw rod 23 axially penetrates through the middle part of the guide rod 212, and the lower part of the screw rod 23 is in threaded connection with the inner bottom of the guide sleeve 25;

a return spring 28 is arranged between the guide sleeve 25 and the guide rod 212, the outer bottom of the guide sleeve 25 is provided with threads, and the outer bottom of the guide sleeve 25 is provided with a locking sleeve 26;

further, the secondary adjusting mechanism 3 comprises a secondary adjusting body 31, a sliding block 32, a guide pin 35, a jacking screw rod 33 and a limiting screw rod 34;

the secondary adjustment body 31 comprises a limiting groove 37 and an avoiding groove 38 which are integrally arranged, and also comprises two guide pin holes, two threaded holes and two mounting holes at the bottom;

the sliding block 32 comprises a threaded hole in the middle and guide pin holes at two ends, the sliding block 32 is arranged in the limiting groove 37, and the two guide pins 35 penetrate through the guide pin holes of the secondary adjusting body 31 and are hinged with the guide pin holes of the sliding block;

the jacking screw rod 33 is connected through a threaded hole in the middle of the sliding block 32, and the two limiting screw rods 34 are arranged in two threaded holes of the secondary adjusting body 31;

further, the reset mechanism 4 comprises a force transmission sleeve 41, a thrust spring 42 and a plug 43;

the force transmission sleeve 41 slides along the guide hole 11, the screw plug 43 is arranged at the bottom of the guide hole 11, and the thrust spring 42 is arranged between the force transmission sleeve 41 and the screw plug 43.

Further, the clearance between the slide block 32 and the limiting groove 37 is 0.10 mm.

Furthermore, the guide hole 11 is a stepped hole, and the upper part of the guide hole 11 has a small aperture and plays a limiting role.

Further, the bottom plate 1 is provided with two positioning holes for installing the positioning pins 5; the bottom plate 1 is also provided with 5 threaded holes which are respectively used for installing the pressing mechanism 2 and the secondary adjusting mechanism 3.

Further, a locking plane is arranged at the top end position of the cam 221, so that compression and locking are realized.

The guide rod 212 is inserted into the guide sleeve 25, can slide up and down, and can rotate 360 degrees.

A method for adjusting the gap between a balance shaft and a machine oil pump split charging tool comprises the following steps:

installing a positioning ring at a positioning hole I63 at the rear end of the shell of the balance shaft 6, slightly meshing and aligning an oil pump power gear 71 and a driving gear 61 at the rear end of the balance shaft, then inserting the oil pump power gear, and aligning and installing a positioning hole II 72 at the front end surface of an oil pump 7 to the positioning ring at the rear end of the shell of the balance shaft 6;

the balance shaft 5 and the oil pump 6 are separately assembled together, a connecting bolt is used for connecting a pre-tightening bolt hole 81, and the connecting bolt is pre-tightened for 1 NM;

aligning a positioning hole at the bottom of the balance shaft 6 with a positioning pin 5 on the bottom plate 1, and mounting a sub-assembly 8 of the balance shaft and the oil pump on the bottom plate 1;

the balance shaft and the oil pump sub-assembly 8 is pressed by the pressing mechanism 2;

screwing the limit screw rod 34 to push the slide block 32 to advance without clearance, screwing the jacking screw rod 33 to push a small platform of a shell of the oil pump 7 to enable the oil pump 7 to rotate clockwise, and simultaneously using a torque wrench to rotate the driving shaft 62 to measure the rotation torque of the balance shaft 6 until the torque is 0.5NM, wherein the gear meshing clearance between the two is zero;

the limit screw rod 34 is loosened, and the oil pump 7 rotates anticlockwise under the action of the reset mechanism 4;

the clearance between the slide block 32 and the limit groove 37 ensures that the slide block returns 0.10 mm;

the tightening torque of the connecting bolt is 10 +/-2 NM;

the balance shaft drive shaft 62 is rotated to confirm whether the balance shaft is qualified or not, and the whole adjustment process can be independently completed by one operator.

Compared with the prior art, the invention has the beneficial effects that:

the invention can independently complete the gap adjustment between the balance shaft and the oil pump by an operator; the balance shaft and the oil pump sub-assembly can be quickly fixed; the consistency of the adjusting clearance can be ensured; the clearance for withdrawal can be guaranteed to be 0.10 mm. The invention is particularly suitable for trial production of new products, especially for small-batch trial production.

Drawings

The invention is further described with reference to the accompanying drawings in which:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a cross-sectional view of the hold-down mechanism of the present invention;

FIG. 3a is a cross-sectional view of a two-stage adjustment mechanism of the present invention at a position of a limiting screw;

FIG. 3b is a cross-sectional view of the guide pin of the two-stage adjustment mechanism of the present invention;

FIG. 4 is a cross-sectional view of the reset mechanism of the present invention;

FIG. 5 is a balance shaft view of the present invention;

FIG. 6 is a view of the oil pump of the present invention;

FIG. 7 is a view of the balance shaft and oil pump assembly of the present invention;

FIG. 8 is a schematic view of the gap adjustment of the present invention;

in the figure: 1. a base plate; 11. a guide hole;

2. a hold-down mechanism; 21. a indenter substrate; 211. a cantilever; 212. a guide bar; 22. a compression cam; 221. a cam; 222. a force application arm; 23. a screw rod; 24. a connecting pin; 25. a guide sleeve; 26. a locking sleeve; 27. adjusting a pressure head; 28. a return spring;

3. a secondary adjustment mechanism; 31. a second-stage adjustment body; 32. a slider; 33. jacking a screw rod; 34. a limiting screw rod; 35. a guide pin; 36. mounting holes; 37 a limiting groove; 38. an avoidance groove;

4. a reset mechanism; 41. a force transmission sleeve; 42. a thrust spring; 43. plugging with a thread;

5. positioning pins;

6. a balance shaft; 61. a drive gear; 62. a drive shaft; 63. a first positioning hole;

7. an oil pump; 71. a power gear; 72. a second positioning hole;

8. the balance shaft and the oil pump are assembled; 81. and pre-tightening the bolt hole position.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.

The invention is described in detail below with reference to the attached drawing figures:

the invention aims to design a tool to solve the problems that the traditional method is difficult to adjust the meshing clearance between a balance shaft and an oil pump, the efficiency is low, the clearance of 0.10mm which can not meet the design requirement by 100 percent and the consistency of the adjustment clearance is poor under the condition that no special mechanical equipment for a production line exists in the trial-manufacture and production of an engine.

The invention can realize the adjustment of the meshing clearance between the balance shaft and the oil pump by one-man operation. The tool is reset through the spring, and the consistency of reset force is guaranteed, so that the consistency of an adjusting gap is guaranteed. The tool ensures that the tool returns 0.10mm through two-stage adjustment of the tool. The tool is convenient to use, simple to operate, low in labor intensity, capable of saving working hours and improving efficiency, and particularly suitable for trial production, test and production of new products.

The technical scheme of the invention is as follows:

a split charging tool for a balance shaft and an oil pump and a gap adjusting method comprise a bottom plate 1, three pressing mechanisms 2, a two-stage adjusting mechanism 3, a resetting mechanism 4, two positioning pins 5 and a guide hole 11, wherein the three pressing mechanisms 2, the two-stage adjusting mechanism 3 and the resetting mechanism 4 are arranged on the bottom plate 1.

The guide hole 11 is a stepped hole, and the upper part of the guide hole 11 is small in aperture and plays a limiting role.

The pressing mechanism 2 comprises a pressing head base body 21, a pressing cam 22, a connecting pin 24, a screw rod 23, a return spring 28, a guide sleeve 25 and a locking sleeve 26. The pressing cam 22 comprises a force-applying arm 222 and a cam 221 which are integrally arranged, the pressure head base body 21 comprises a cantilever 211 and a guide rod 212 which are integrally arranged, the cantilever 211 is in threaded connection with an adjusting pressure head 27 at one end far away from the guide rod 212, the cam 221 is hinged with the screw rod 23, and an included angle between the force-applying arm 222 and the upper end face of the cantilever 211 is 0-45 degrees. The guide rod 212 penetrates through the guide sleeve 25, the screw rod 23 axially penetrates through the middle of the guide rod 212, the lower portion of the screw rod 23 is in threaded connection with the inner bottom of the guide sleeve 25, the reset spring 28 is arranged between the guide sleeve 25 and the guide rod 212, threads are arranged at the outer bottom of the guide sleeve 25, and the locking sleeve 26 is arranged at the outer bottom of the guide sleeve 25 in a threaded manner. The pressing mechanism 2 is in threaded connection with the bottom plate 1 through the outer bottom of the guide sleeve 25.

The secondary adjusting mechanism 3 comprises a secondary adjusting body 31, a sliding block 32, a guide pin 35, a jacking screw rod 33 and a limiting screw rod 34. The secondary adjustment body 31 comprises a limiting groove 37 and an avoiding groove 38 which are integrally arranged, and further comprises two guide pin holes, two threaded holes and two mounting holes at the bottom. The sliding block 32 comprises a threaded hole in the middle and guide pin holes at two ends, the sliding block 32 is arranged in the limiting groove 37, the two guide pins 35 penetrate through the guide pin holes of the secondary adjusting body 31 and are hinged with the guide pin holes of the sliding block, and the gap between the sliding block 32 and the limiting groove 37 is 0.10 mm. The jacking screw rod 33 is connected with the middle threaded hole of the sliding block 32, and the two limiting screw rods 34 are arranged in the two threaded holes of the secondary adjusting body 31. The second-stage adjusting mechanism 3 is connected with the bottom plate 1 through two mounting holes at the bottom.

The reset mechanism 4 comprises a force transmission sleeve 41, a thrust spring 42 and a plug 43. The reset mechanism 4 is positioned in the guide hole 11 of the bottom plate, the force transmission sleeve 41 slides along the guide hole 11, the screw plug 43 is installed at the bottom of the guide hole, and the thrust spring 42 is arranged between the force transmission sleeve 41 and the screw plug 43.

By adopting the technical scheme, the positioning ring is installed at the rear end of the balance shaft shell, the balance shaft and the oil pump are separately assembled together, the balance shaft and the oil pump are connected by using three connecting bolts, and the connecting bolts are pre-tightened by 1 NM. And mounting the sub-assembly of the balance shaft and the oil pump on the tool bottom plate, wherein the positioning hole at the bottom of the balance shaft is aligned with the positioning pin on the bottom plate for mounting. And (3) pressing the balance shaft and the oil pump sub-assembly by using three pressing mechanisms. Screwing the limit screw rod to push the sliding block to advance without clearance, screwing the jacking screw rod to push a small platform of a pump shell of the engine oil pump to enable the engine oil pump to rotate clockwise, and simultaneously measuring the rotation torque of the balance shaft by using a torque wrench until the torque is 0.5NM, wherein the gear meshing clearance between the two is zero. Then two limit screw rods are loosened at the same time, and the oil pump rotates anticlockwise under the action of the reset mechanism. The clearance between the slide block and the slide block guide groove ensures that the slide block is retracted by 0.10 mm. The remaining 4 tie bolts were installed and a total of 7 tie bolts were torque tightened to (10 ± 2) NM. And rotating the balance shaft to determine whether the balance shaft is qualified. The whole adjusting process can be independently completed by one operator.

Therefore, the tool has the advantages of simple and labor-saving adjustment of the clearance between the balance shaft and the oil pump, and can improve the assembly efficiency.

A balance shaft and oil pump subpackaging tool comprises a pressing mechanism 2, a secondary adjusting mechanism 3 and a bottom plate 1, wherein a positioning pin 5 and a reset mechanism 4 are arranged on the bottom plate 1.

The bottom plate 1 is provided with two positioning holes for installing the positioning pins 5. The bottom plate 1 is also provided with 5 threaded holes which are respectively used for installing the pressing mechanism 2 and the secondary adjusting mechanism 3.

The bottom plate 1 is also provided with a guide hole 11, the force transmission sleeve 41 slides along the guide hole 11, the plug 43 is arranged at the bottom of the guide hole 11, and the thrust spring 42 is arranged between the force transmission sleeve 41 and the plug 43 to jointly form the reset mechanism 4.

The pressing mechanism 2 comprises a pressing head base body 21, a pressing cam 22, a screw rod 23, a connecting pin 24, a guide sleeve 25, a locking sleeve 26, an adjusting pressing head 27 and a return spring 28.

The ram base 21 includes a cantilever 211 and a guide bar 212 integrally provided.

The cantilever arm 211 is threadedly coupled to the adjustment ram 27 at an end remote from the guide rod 212.

The pressing cam 22 comprises a force adding arm 222 and a cam 221 which are integrally arranged, the cam 221 is hinged with the screw rod 23, and an included angle between the pressing cam 22 and the upper end face of the pressing head base body 21 is 0-45 degrees.

The top end position of the cam 221 is provided with a locking plane, so that the compression and the locking are realized.

The guide rod 212 is inserted in the guide sleeve 25, can slide up and down, and can rotate 360 degrees.

The screw rod 23 axially passes through the middle part of the guide rod 212, and the lower part of the screw rod 23 is in threaded connection with the inner bottom thread of the guide sleeve 25.

The return spring 28 is provided between the guide sleeve 25 and the guide rod 212.

The outer bottom of the guide sleeve 25 is provided with threads, and the outer bottom of the guide sleeve 25 is provided with a locking sleeve 26 by the threads.

The secondary adjusting mechanism 3 comprises a secondary adjusting body 31, a slide block 32, a guide pin 35, a jacking screw rod 33 and a limiting screw rod 34.

The secondary adjustment body 31 includes a limiting groove 37 and an avoiding groove 38, which are integrally formed, and further includes two guide pin holes, two threaded holes and two bottom mounting holes 36.

The slide block 32 includes a threaded hole in the middle and guide pin holes at both ends.

The slide block 32 is arranged in the limiting groove 37, the two guide pins 35 penetrate through the guide pin holes of the secondary adjusting body 31 and are hinged with the guide pin holes of the slide block 32, the slide block 32 slides between the limiting groove 37 along the guide pins 35, and the gap between the slide block 32 and the limiting groove 37 is 0.10 mm.

The jacking screw rod 33 is connected through a threaded hole in the middle of the sliding block 32.

The limit screw 34 is installed in a threaded hole of the secondary adjustment body 31.

The secondary adjusting mechanism 3 is connected with two threaded holes on the bottom plate 1 through two mounting holes 36 at the bottom.

The tool can independently complete the split charging and the gap adjustment of the balance shaft and the oil pump by one operator.

As shown in fig. 1, the tool of the present invention is designed with a bottom plate 1, a pressing mechanism 2, a secondary adjusting mechanism 3, a reset mechanism 4, a positioning pin 5, etc.

The bottom plate 1 is of a flat plate structure, and two positioning holes are formed in the bottom plate 1 and used for installing the positioning pins 5 to realize positioning of the balance shaft and the oil pump sub-assembly 8. The bottom plate 1 is also provided with 5 threaded holes which are respectively used for installing the pressing mechanism 2 and the secondary adjusting mechanism 3.

As shown in fig. 4, the bottom plate 1 is further provided with a guide hole 11, the force transmission sleeve 41 slides along the guide hole 11, the plug 43 is installed at the bottom of the guide hole 11, and the thrust spring 42 is arranged between the force transmission sleeve 41 and the plug 43 to jointly form the reset mechanism 4.

As shown in fig. 1, three pressing mechanisms 2 are provided in total, and one of the three pressing mechanisms is identical in structure and different in position. The pressing cam 22 comprises a force adding arm 222 and a cam 221 which are arranged integrally, the pressure head base body 21 comprises a cantilever 211 and a guide rod 212 which are arranged integrally, the cantilever 211 is connected with an adjusting pressure head 27 in a threaded mode at one end far away from the guide rod 212, and the adjusting pressure head 27 can adjust the pressing height through rotation. The cam 221 is hinged with the screw rod 23, an included angle between the pressing cam 22 and the upper end face of the pressure head base body 21 is 0-45 degrees, the pressing cam is pressed and locked at 0 degree, and the pressing cam is released at 45 degrees. The guide rod 212 penetrates through the guide sleeve 25, can slide up and down and can rotate 360 degrees, the screw rod 23 penetrates through the middle of the guide rod 212 in the axial direction, the lower portion of the screw rod 23 is in threaded connection with threads at the bottom in the guide sleeve 25, and the pressing height of the screw rod 23 can be adjusted through rotation. As shown in fig. 2, a return spring 28 is arranged between the guide sleeve 25 and the guide rod 212, the outer bottom of the guide sleeve 25 is provided with a thread, and the outer bottom of the guide sleeve 25 is provided with a locking sleeve 26. The pressing mechanism 2 is in threaded connection with a corresponding threaded hole of the bottom plate through the outer bottom of the guide sleeve 25, the guide sleeve 25 can adjust the pressing height through rotation, and the locking sleeve 26 realizes locking.

As shown in fig. 1, the secondary adjustment mechanism 3 includes a secondary adjustment body 31, a slider 32, a guide pin 35, a jacking screw 33, and a limit screw 34. The secondary adjustment body 31 includes a limiting groove 37 and an avoiding groove 38, which are integrally formed, and further includes two guide pin holes, two threaded holes and two bottom mounting holes 36. The slide block 32 includes a threaded hole in the middle and guide pin holes at both ends. As shown in fig. 3, the sliding block 32 is disposed in the limiting groove 37, and two guide pins 35 are hinged to the guide pin holes of the sliding block 32 through the guide pin holes of the secondary adjustment body 31, so that the sliding block 32 slides between the limiting groove 37 along the guide pins 35, and the gap between the sliding block 32 and the limiting groove 37 is 0.10 mm. The jacking screw rod 33 is connected with the middle threaded hole of the sliding block 32, and the two limiting screw rods 34 are arranged in the two threaded holes of the secondary adjusting body 31. The secondary adjusting mechanism 3 is connected with two threaded holes on the bottom plate 1 through two mounting holes 36 at the bottom.

The principle of adjusting the gap between the balance shaft and the oil pump by using the tool is as follows:

as shown in fig. 7, a positioning ring is mounted in a positioning hole one 63 at the rear end of the housing of the balance shaft 6, the oil pump power gear 71 is slightly meshed with the rear end driving gear 61 of the balance shaft and is inserted into the positioning hole in alignment, and a positioning hole two 72 at the front end surface of the oil pump 7 is mounted in alignment with the positioning ring at the rear end of the housing of the balance shaft 6. The balance shaft 5 and the oil pump 6 are separately assembled together, three connecting bolts are used for connecting at a pre-tightening bolt hole position 81, and the connecting bolts are pre-tightened by 1 NM.

As shown in fig. 8, a positioning hole at the bottom of the balance shaft 6 is aligned with the positioning pin 5 on the base plate 1, and the sub-assembly 8 of the balance shaft and the oil pump is mounted on the base plate 1. Three pressing mechanisms 2 are used for pressing the balance shaft and oil pump sub-assembly 8. Screwing the limit screw rod 34 to push the slide block 32 to advance without clearance, screwing the jacking screw rod 33 to push a small platform of the shell of the oil pump 7 to enable the oil pump 7 to rotate clockwise, and simultaneously using the torque wrench to rotate the driving shaft 62 to measure the rotation torque of the balance shaft 6 until the torque is 0.5NM, and at the moment, the gear meshing clearance between the two is zero. Then two limit screw rods 34 are simultaneously loosened, and the oil pump 7 rotates anticlockwise under the action of the reset mechanism 4. The clearance between the slide 32 and the stop groove 37 ensures a 0.10mm return. The remaining 4 tie bolts were installed and a total of 7 tie bolts were torque tightened to (10 ± 2) NM. The balance shaft drive shaft 62 is rotated to confirm whether it is acceptable. The whole adjusting process can be independently completed by one operator.

The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims. And those not described in detail in this specification are well within the skill of those in the art.