CN111993345A - Mechanical fuel injection pump gear nut tightening and fixing device and using method thereof - Google Patents
Mechanical fuel injection pump gear nut tightening and fixing device and using method thereof Download PDFInfo
- Publication number
- CN111993345A CN111993345A CN202010656074.6A CN202010656074A CN111993345A CN 111993345 A CN111993345 A CN 111993345A CN 202010656074 A CN202010656074 A CN 202010656074A CN 111993345 A CN111993345 A CN 111993345A
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- injection pump
- fuel injection
- gear
- pump gear
- limiting column
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- 238000002347 injection Methods 0.000 title claims abstract description 134
- 239000007924 injection Substances 0.000 title claims abstract description 134
- 239000000446 fuel Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000000670 limiting effect Effects 0.000 claims abstract description 51
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
- B25B11/02—Assembly jigs
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fuel-Injection Apparatus (AREA)
- Rotary Pumps (AREA)
Abstract
The invention discloses a mechanical fuel injection pump gear nut tightening and fixing device and a using method thereof, and is characterized in that: the oil injection pump is characterized by comprising an inner gear ring (3), a connecting plate (2) and a limiting column (1), wherein inner teeth (302) matched with a gear of an oil injection pump are arranged on the inner circumferential surface of the inner gear ring (3), the outer circumferential surface of the inner gear ring (3) is connected with one end of the connecting plate (2), the limiting column (1) is vertically connected with the other end of the connecting plate (2), and the axial direction of the limiting column (1) is consistent with the axial direction of the inner gear ring (3). The device can quickly and conveniently prevent the follow-up rotation of the fuel injection pump gear under the condition that the fuel injection pump gear is not damaged, and meanwhile, the device has the effect of quick assembly and disassembly and can be quickly adapted to fuel injection pump gears of different models.
Description
Technical Field
The invention relates to the technical field of engine assembly, in particular to a mechanical tightening and fixing device for a gear nut of an oil injection pump and a using method of the mechanical tightening and fixing device.
Background
In the field of assembly and manufacture of internal combustion engines, the assembly of the oil injection pump gear is carried out in a rear gear system together with installation links such as a crankshaft timing gear and the like, so that the condition of the assembly of the oil injection pump gear is directly related to whether the whole rear gear system is in timing or not, and the oil injection pump gear plays an important role and an important process in the assembly.
The installation of mechanical type injection pump gear is fixed, need to keep injection pump gear not rotatory just can tighten injection pump gear fastening nut. If the injection pump gear can not be fixed, then when tightening injection pump gear fastening nut, the injection pump gear can follow the commentaries on classics together with the oil pump axle, leads to unable injection pump gear fastening nut of tightening. Therefore, when the fastening nut of the fuel injection pump gear is tightened, the fuel injection pump gear and the fuel injection pump shaft must be fixed, and follow-up rotation is avoided. The existing oil injection pump gear nut screwing process mainly has the following stuffing defects:
1. in the prior art, no particularly suitable device is used for fixing the oil injection pump gear and the oil injection pump shaft, and even if the device is used, the device is large-scale special equipment, and can be purchased only by investing a large amount of cost for enterprises, and the assembly efficiency is low;
2. the existing special tool for limiting the gear of the fuel injection pump can only be used for the gear of the fuel injection pump with a single model, and has no universality.
Disclosure of Invention
In view of the above-mentioned existing defects, the present invention aims to provide a mechanical fuel injection pump gear nut tightening and fixing device and a use method thereof, which can quickly and conveniently fix a fuel injection pump gear and a fuel injection pump shaft, prevent follow-up rotation without damaging the fuel injection pump gear, and meanwhile, the device has the effect of quick assembly and disassembly, and can quickly adapt to fuel injection pump gears of different models.
The technical scheme of the invention is as follows:
a mechanical fuel injection pump gear nut screwing and fixing device comprises an inner gear ring, a connecting plate and a limiting column, wherein inner teeth matched with a fuel injection pump gear are arranged on the inner circumferential surface of the inner gear ring, the outer circumferential surface of the inner gear ring is connected with one end of the connecting plate, the limiting column is vertically connected with the other end of the connecting plate, and the axial direction of the limiting column is consistent with the axial direction of the inner gear ring.
Preferably, the outer peripheral surface of the inner gear ring is radially provided with a T-shaped boss, and the side surface of the T-shaped boss is provided with a first threaded hole which penetrates through the T-shaped boss; one end of the connecting plate is provided with a T-shaped opening, a second threaded hole and a third threaded hole are coaxially arranged on the side face of the connecting plate on two sides of the T-shaped opening, the inner gear ring is connected with the connecting plate through a T-shaped boss and the T-shaped opening, and the inner gear ring is fixed with the connecting plate through a jackscrew bolt penetrating through the second threaded hole, the first threaded hole and the third threaded hole.
Preferably, the T-shaped boss is an integrally formed part in which the outer peripheral surface of the ring gear is itself protruded outward.
Preferably, one end of the limit column is provided with a stud, and the diameter of the stud is smaller than that of the limit column; and a connecting hole matched with the diameter of the stud is formed in the side face of one end, connected with the limiting column, of the connecting plate, and the stud penetrates through the connecting hole and is fixed through a nut.
Preferably, the connecting plate and the limiting column are integrally formed.
The invention also provides a use method of the mechanical fuel injection pump gear nut tightening and fixing device, which comprises the following steps:
s1: after the oil injection pump gear nut is arranged on the oil injection pump gear, the oil pump gear nut is screwed down to the oil injection pump gear to start transmission;
s2: assembling the inner gear ring on a gear of the fuel injection pump, and enabling the limiting column to be located on the outer side of the fuel injection pump, wherein the tail part of the limiting column faces the end of the fuel injection pump;
s3: the fuel injection pump gear nut is screwed down along the screwing direction to drive the limiting column to rotate until the limiting column abuts against the fuel injection pump body, the fuel injection pump gear is clamped to be incapable of rotating, and then the fuel injection pump gear nut is screwed down to a preset constant force value of 120N·m；
S4: and (5) detaching the tightening fixing device, and finishing the operation.
The invention also provides a use method of the other mechanical fuel injection pump gear nut tightening and fixing device, which comprises the following steps:
s1: after the oil injection pump gear nut is arranged on the oil injection pump gear, the oil pump gear nut is screwed down to the oil injection pump gear to start transmission;
s2: assembling the inner gear ring on a gear of the oil injection pump, and enabling the tail part of the limiting column to be back to the oil injection pump end;
s3: the fuel injection pump gear nut is screwed in the screwing direction, the limiting column is held by hand, the fuel injection pump gear is clamped to be incapable of rotating, and then the fuel injection pump gear nut is screwed to be presetConstant force value of 120N·m；
S4: and (5) detaching the tightening fixing device, and finishing the operation.
Compared with the prior art, the invention has the following beneficial effects:
1. the internal gear ring is sleeved on the driving gear of the oil injection pump, the limiting column at the tail end of the connecting plate is abutted and clamped with the oil injection pump body, the driving gear of the oil injection pump does not rotate under the limiting of the limiting column, and the oil injection pump gear nut can be immediately tightened by a tightening tool, so that the whole operation process is simple, manual or external force control braking is not needed, and the assembly efficiency is high;
2. the device can be disassembled and assembled, and has strong modularity, so that the inner gear ring can be replaced according to different types and sizes of the oil injection pump gears, and the device is suitable for different types of oil injection pumps or products with similar limiting requirements;
3. the device is applied to the assembly process without damaging the gear of the fuel injection pump, has few structural parts, low use and maintenance cost and popularization prospect.
Drawings
FIG. 1 is a schematic view of a mechanical fuel injection pump gear nut tightening fixture of the present invention;
FIG. 2 is an assembly and operation diagram of a mechanical fuel injection pump gear nut tightening fixture according to the present invention;
FIG. 3 is a cross-sectional view of a connection plate according to an embodiment of the present invention;
FIG. 4 is a front view of a retaining post according to an embodiment of the present invention;
fig. 5 is a front view of an annular gear in an embodiment of the invention.
In the figure: 1-limiting column, 101-stud, 2-connecting plate, 201-connecting hole, 202-second threaded hole, 203-third threaded hole, 204-T-shaped opening, 3-inner gear ring, 301-T-shaped boss, 302-inner gear, 303-third threaded hole, 4-nut, 5-jackscrew bolt, 6-oil injection pump, 7-oil injection pump gear nut and 8-oil injection pump gear.
Detailed Description
In order to explain the technical content, the achieved objects and the effects of the present invention in detail, the following description is made in conjunction with the embodiments and the accompanying drawings. In the description of the present embodiments, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present embodiments and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
The mechanical fuel injection pump gear nut tightening and fixing device shown in fig. 1 to 5 is mainly characterized by comprising a limiting column 1, a connecting plate 2 and an inner gear ring 3. The inner peripheral surface of the inner gear ring 3 is provided with inner teeth 302 matched with a gear of an oil injection pump, the outer peripheral surface of the inner gear ring 3 is connected with one end of a connecting plate 2, the limiting column 1 is vertically connected with the other end of the connecting plate 2, and the axial direction of the limiting column 1 is consistent with the axial direction of the inner gear ring 3.
When the fuel injection pump gear fastening nut 7 needs to be fastened, as shown in fig. 2, the inner gear ring 3 of the device of the embodiment is sleeved on the fuel injection pump gear nut 7, the fixed column 1 is located on the outer side of the fuel injection pump 6, the tail end of the fixed column faces the end of the fuel injection pump 6, the fuel injection pump gear nut 7 can be fastened by using a fastening tool immediately, and since the fuel injection pump 6 is located on the upper portion of the fuel injection pump gear 8 and provided with a protrusion, when the fuel injection pump gear 8 rotates to drive the fixed column 1 to rotate, the fixed column 1 is in contact with the side face of the protrusion of the fuel. At the moment, the fuel injection pump gear nut 7 is continuously tightened, the fuel injection pump gear 8 and the fuel injection pump shaft cannot continuously rotate due to the limiting effect of the fixing column 1, so that the fuel injection pump gear 8 can be quickly limited to rotate, the fuel injection pump gear nut 7 is tightened under the condition of reducing labor intensity, further, guarantee is provided for next operation, and the purpose of the invention is achieved.
As a preferred technical solution of this embodiment, as shown in fig. 5, in the ring gear 3, a T-shaped boss 301 is radially arranged on the outer peripheral surface of the ring gear 3, and a first threaded hole 303 is formed in the side surface of the T-shaped boss 301 on the periphery of the ring gear 3; as shown in fig. 3, the connecting plate 2 is a metal plate-shaped connecting plate with a certain thickness, and the top end of the connecting plate 2 is provided with a T-shaped opening 204 for matching and connecting with a T-shaped boss 301 of the ring gear 3, so as to achieve the purpose of connecting the ring gear 3 with the connecting plate 2 and limit the radial movement of the ring gear 3; at the position of a T-shaped opening 204 at the top end of the connecting plate 2, a pair of opposite second threaded holes 202 and third threaded holes 203 are formed in the side surface of the T-shaped opening, and a jackscrew bolt 5 penetrates through the connecting plate 2 and the ring gear 3 at the same time, specifically penetrates through the second threaded holes 202, the first threaded holes 303 and the third threaded holes 203 to limit the axial movement of the ring gear 3. Because the inner gear ring 3 and the connecting plate 2 are pre-limited by adopting a T-shaped clamping structure, the mounting is firm and convenient, and the quick dismounting can be realized only by dismounting one bolt, the inner gear ring 3 can be manufactured into a plurality of gear rings with different specifications and sizes according to different product requirements for quick replacement, or different gear rings are manufactured according to the appearance shape of a target part, the application range can be widened so as to adapt to different product requirements, the manufacturing cost is low, the maintenance is convenient and fast, and the use is convenient.
As a preferred technical solution of this embodiment, as shown in fig. 1 of the limiting column 1, the surface of the limiting column 1 is a cylindrical body, and the end of the connecting plate 2 has a connecting hole 201, as shown in fig. 1 and 4, a small section of stud 101 with a smaller diameter than that of other parts is arranged at the end of the limiting column 1 and is used for connecting with the connecting hole 201 on the connecting plate 2, the outer diameter of the stud 101 is the same as the inner diameter of the connecting hole 201 on the connecting plate 2, and the stud 101 passes through the connecting hole 201 and is fastened by a nut 4. The limiting column 1 is mainly used for limiting. Because the connecting plate 2 and the spacing post 1 are detachably connected, the spacing post 1 can be installed and adapted by selecting spacing posts 1 with different lengths according to the overall dimensions of different types of machines, and the universal connecting structure is more universal.
In the embodiment, the inner gear ring 3 and the limiting column 1 of the connecting plate 2 can be replaced according to the types and sizes of the oil injection pumps of different types, so that the oil injection pump is suitable for oil injection pumps of different types or products with similar limiting requirements.
According to the mechanical fuel injection pump gear nut tightening and fixing device of the embodiment, the using method comprises the following steps:
s1: after the oil injection pump gear nut is arranged on the oil injection pump gear, the oil pump gear nut is screwed down to the oil injection pump gear to start transmission;
s2: assembling the inner gear ring 3 on a gear of the fuel injection pump, and enabling the limiting column 1 to be positioned outside the fuel injection pump, wherein the tail part of the limiting column 1 faces the fuel injection pump end;
s3: the fuel injection pump gear nut is screwed down along the screwing direction to drive the limiting column 1 to rotate until the limiting column abuts against the fuel injection pump body, so that the fuel injection pump gear is clamped and cannot rotate, and then the fuel injection pump gear nut is screwed down to a preset constant force value of 120N·m；
S4: and (5) detaching the tightening fixing device, and finishing the operation.
In addition, in some embodiments, the connecting plate 2 and the limiting column 1 can also be an integrally formed part; the T-shaped boss 301 may also be an integrally formed part that is outwardly convex from the outer peripheral surface of the ring gear 3 itself. When as integrated into one piece spare, can reduce the installation step of device, it is convenient to use.
In addition, in some embodiments, in another use method of the mechanical fuel injection pump gear nut tightening fixing device, the gear ring 3 is sleeved on the fuel injection pump gear nut 7, the fixing column 1 faces outwards, and when the fuel injection pump gear nut is tightened, the fixing column 1 is held by hands, so that the rotation of the fuel injection pump gear can be limited. The method specifically comprises the following steps:
s1: after the oil injection pump gear nut is arranged on the oil injection pump gear, the oil pump gear nut is screwed down to the oil injection pump gear to start transmission;
s2: assembling the inner gear ring 3 on a gear of the oil injection pump, and enabling the tail part of the limiting column 1 to be back to the oil injection pump end;
s3: the fuel injection pump gear nut is screwed down in the screwing direction, while the limiting column 1 is held by hand, until the fuel injection pump gear is stuck and cannot rotate any more, and then the fuel injection pump gear nut is screwed down to a preset constant force value of 120N·m；
S4: and (5) detaching the tightening fixing device, and finishing the operation.
Although the invention has been described in detail above with reference to specific embodiments, it will be apparent to one skilled in the art that modifications or improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (7)
1. The utility model provides a fixing device is screwed up to mechanical type injection pump gear nut which characterized in that: the oil injection pump is characterized by comprising an inner gear ring (3), a connecting plate (2) and a limiting column (1), wherein inner teeth (302) matched with a gear of an oil injection pump are arranged on the inner circumferential surface of the inner gear ring (3), the outer circumferential surface of the inner gear ring (3) is connected with one end of the connecting plate (2), the limiting column (1) is vertically connected with the other end of the connecting plate (2), and the axial direction of the limiting column (1) is consistent with the axial direction of the inner gear ring (3).
2. The mechanical fuel injection pump gear nut tightening fixture of claim 1, characterized in that: a T-shaped boss (301) is radially arranged on the outer peripheral surface of the inner gear ring (3), and a first threaded hole (303) penetrating through the T-shaped boss (301) is formed in the side surface of the T-shaped boss; one end of the connecting plate (2) is provided with a T-shaped opening (204), a second threaded hole (202) and a third threaded hole (203) are coaxially arranged on the side faces of the connecting plate (2) on two sides of the T-shaped opening (204), the inner gear ring (3) is connected with the connecting plate (2) through a T-shaped boss (301) and the T-shaped opening (204), and is fixed through a jackscrew bolt (5) penetrating through the second threaded hole (202), the first threaded hole (303) and the third threaded hole (203).
3. The mechanical fuel injection pump gear nut tightening fixture of claim 2, characterized in that: the T-shaped boss (301) is an integrally formed part of the outer peripheral surface of the inner gear ring (3) protruding outwards.
4. The mechanical fuel injection pump gear nut tightening fixture of any one of claims 1-3, wherein: a stud (101) is arranged at one end of the limiting column (1), and the diameter of the stud (101) is smaller than that of the limiting column (1); the connecting plate is characterized in that a connecting hole (201) matched with the diameter of the stud (101) is formed in the side face of one end, connected with the limiting column (1), of the connecting plate (2), and the stud (101) penetrates through the connecting hole (201) and is fixed through a nut (4).
5. The mechanical fuel injection pump gear nut tightening fixture of any one of claims 1-3, wherein: the connecting plate (2) and the limiting column (1) are integrally formed.
6. The use method of the mechanical fuel injection pump gear nut tightening fixture according to claim 1, characterized by comprising the steps of:
s1: after the oil injection pump gear nut is arranged on the oil injection pump gear, the oil pump gear nut is screwed down to the oil injection pump gear to start transmission;
s2: assembling the inner gear ring (3) on a gear of the fuel injection pump, and enabling the limiting column (1) to be located on the outer side of the fuel injection pump, wherein the tail part of the limiting column (1) faces the fuel injection pump end;
s3: the fuel injection pump gear nut is screwed up along the screwing direction to drive the limiting column (1) to rotate until the limiting column abuts against the fuel injection pump body, so that the fuel injection pump gear is clamped and cannot rotate, and then the fuel injection pump gear nut is screwed up to a preset constant force value of 120N·m；
S4: and (5) detaching the tightening fixing device, and finishing the operation.
7. The use method of the mechanical fuel injection pump gear nut tightening fixture according to claim 1, characterized by comprising the steps of:
s1: after the oil injection pump gear nut is arranged on the oil injection pump gear, the oil pump gear nut is screwed down to the oil injection pump gear to start transmission;
s2: the inner gear ring (3) is assembled on a gear of the oil injection pump, and the tail part of the limiting column (1) is back to the oil injection pump end;
s3: the fuel injection pump gear nut is screwed in the screwing direction, the limiting column (1) is held by hand at the same time, the fuel injection pump gear is clamped to be incapable of rotating, and then the fuel injection pump gear nut is screwed to a preset constant force value of 120N·m；
S4: and (5) detaching the tightening fixing device, and finishing the operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010656074.6A CN111993345A (en) | 2020-07-09 | 2020-07-09 | Mechanical fuel injection pump gear nut tightening and fixing device and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010656074.6A CN111993345A (en) | 2020-07-09 | 2020-07-09 | Mechanical fuel injection pump gear nut tightening and fixing device and using method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111993345A true CN111993345A (en) | 2020-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010656074.6A Pending CN111993345A (en) | 2020-07-09 | 2020-07-09 | Mechanical fuel injection pump gear nut tightening and fixing device and using method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111993345A (en) |
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| DE102008034811A1 (en) * | 2008-07-24 | 2010-01-28 | Lorenz Gmbh & Co. Kg | Assembling and disassembling spanner for measuring capsule meter, has drive for transferring torque to interior spanner and another torque to counter spanner, where latter torque is opposite to former torque |
| CN202318125U (en) * | 2011-12-08 | 2012-07-11 | 辽宁太克液压机械集团有限公司 | Gear wrench for assembly of steering pump |
| CN203579556U (en) * | 2013-10-10 | 2014-05-07 | 河南柴油机重工有限责任公司 | High-strength bolt fastening and disassembling device |
| CN104029176A (en) * | 2014-06-11 | 2014-09-10 | 山东交通学院 | Pneumatic handheld anchor rod and nut assembling and disassembling machine |
| CN204036385U (en) * | 2014-07-05 | 2014-12-24 | 广西玉柴机器股份有限公司 | Injection pump transmission external splines setting tool |
| CN104924248A (en) * | 2015-06-30 | 2015-09-23 | 汪学品 | Planetary gear variable-torque type torque wrench |
| CN107717804A (en) * | 2017-11-18 | 2018-02-23 | 苏州金牛精密机械有限公司 | A kind of gear wrench mechanism |
| CN212330918U (en) * | 2020-07-09 | 2021-01-12 | 广西玉柴机器股份有限公司 | Mechanical type injection pump gear nut screws up fixing device |
-
2020
- 2020-07-09 CN CN202010656074.6A patent/CN111993345A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008034811A1 (en) * | 2008-07-24 | 2010-01-28 | Lorenz Gmbh & Co. Kg | Assembling and disassembling spanner for measuring capsule meter, has drive for transferring torque to interior spanner and another torque to counter spanner, where latter torque is opposite to former torque |
| CN202318125U (en) * | 2011-12-08 | 2012-07-11 | 辽宁太克液压机械集团有限公司 | Gear wrench for assembly of steering pump |
| CN203579556U (en) * | 2013-10-10 | 2014-05-07 | 河南柴油机重工有限责任公司 | High-strength bolt fastening and disassembling device |
| CN104029176A (en) * | 2014-06-11 | 2014-09-10 | 山东交通学院 | Pneumatic handheld anchor rod and nut assembling and disassembling machine |
| CN204036385U (en) * | 2014-07-05 | 2014-12-24 | 广西玉柴机器股份有限公司 | Injection pump transmission external splines setting tool |
| CN104924248A (en) * | 2015-06-30 | 2015-09-23 | 汪学品 | Planetary gear variable-torque type torque wrench |
| CN107717804A (en) * | 2017-11-18 | 2018-02-23 | 苏州金牛精密机械有限公司 | A kind of gear wrench mechanism |
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