CN215847901U

CN215847901U - Piston rod nut screwing structure and electric wrench for screwing piston rod nut

Info

Publication number: CN215847901U
Application number: CN202121359845.1U
Authority: CN
Inventors: 杨磊; 毛利剑; 赫建丽; 葛志伟
Original assignee: Zhejiang Wanxiang Marelli Shock Absorber Co ltd; Wanxiang Group Corp
Current assignee: Zhejiang Wanxiang Marelli Shock Absorber Co ltd; Wanxiang Group Corp
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2022-02-18
Anticipated expiration: 2031-06-18

Abstract

The utility model discloses a piston rod nut screwing structure and an electric wrench for screwing a piston rod nut. The electric wrench comprises a shell; the positioning tool comprises a prismatic vertical guide rod arranged at the upper end of the inner wall of the shell and a vertical positioning rod arranged on the vertical guide rod in a sliding manner, wherein the lower end of the positioning rod is provided with a positioning groove, and the positioning groove is used for being matched with a positioning block of a piston rod nut screwing structure; the tightening mechanism comprises a sleeve rotatably arranged in the shell and a rotary actuating mechanism used for driving the sleeve to rotate, and a nut tightening groove is formed in the lower end of the sleeve. According to the utility model, the piston rod nut screwing structure and the electric wrench for screwing the piston rod nut are adopted, the electric wrench can accurately position and lock the piston rod, and the nut screwing efficiency is increased; the electric wrench has stable structure and smooth transmission.

Description

Piston rod nut screwing structure and electric wrench for screwing piston rod nut

Technical Field

The utility model relates to a tightening structure and an electric wrench, in particular to a piston rod nut tightening structure and an electric wrench for tightening a piston rod nut.

Background

The spanner is used for installation and dismantlement, and the most is pneumatic or electronic nut wrench in the existing market, is driven by a powerful motor, has multistage variable speed torsion multiplier. The existing nut wrench has no positioning structure.

For example, the "pneumatic nut wrench" disclosed in chinese patent literature, which is published as 2016, 8, 24, and its publication No. CN105881436A, comprises a body, a pneumatic motor, a handle, and a nut sleeve, wherein the handle is located at the tail of the body, the handle is provided with an air inlet and a control switch, the air inlet is connected with the pneumatic motor through a pipeline, the pneumatic nut wrench is characterized in that the pneumatic motor is connected with a forward and reverse speed changing device, the forward and reverse speed changing device is connected with a transmission speed changing device, the transmission speed changing device is connected with the nut sleeve through a connector to twist, and the front part of the body is provided with a reaction force arm near the nut sleeve. The machine body is provided with a speed change switch with two gears of a fast gear and a slow gear.

The prior patents have the following disadvantages: the automatic nut wrench is unstable in the process of tightening or disassembling, and the nut sleeve is easy to vibrate or deflect; the spanner is not internally provided with a positioning structure, and the nut is easy to deflect in the screwing process.

SUMMERY OF THE UTILITY MODEL

The utility model provides a piston rod nut screwing structure with a positioning structure and an electric wrench for screwing a piston rod nut, which are stable in structure and have the positioning structure, and aims to solve the problems that a nut sleeve is easy to vibrate or deflect and no positioning is arranged in the wrench in the prior art.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a piston rod nut screws up structure, includes piston rod pole body, sets up the screw rod in pole body upper end, with screw rod complex nut, the upper end center of screw rod is equipped with prismatic locating piece, screw rod and pole body are integrated into one piece structure.

During the assembly, with the part assembly to the screw rod on, the screw rod upper end is equipped with the locating piece, and electric spanner passes through locating piece location piston rod, opens the switch, and electric spanner passes through the screw thread with the nut and screws up on the screw rod of piston rod. The positioning block on the piston rod enables the electric wrench to quickly and accurately position the piston rod, and the stability of the electric wrench in the process of screwing or disassembling the nut is improved. The hardness of the electric wrench is higher than that of the piston rod, the piston rod is provided with the positioning block, the strength of the piston rod screw rod is increased, when the positioning block is inserted into the electric wrench to screw the nut, the positioning block is not easy to deform or break, and the service life of the piston rod is prolonged.

Preferably, the projection of the positioning block on the upper end face of the screw falls within the upper end face of the screw in the axial direction of the screw. The nut is convenient to install, and the shaft shoulder between the positioning block and the screw rod is used for limiting the piston rod on the positioning rod.

Preferably, the outer diameter of the screw is smaller than the outer diameter of the shaft. The limiting nut is convenient to install. And a shaft shoulder between the rod body and the screw rod is used for limiting the nut on the screw rod.

An electric wrench for tightening a piston rod nut, for tightening a nut in a piston rod nut tightening structure according to any one of claims 1 to 3, comprising:

a housing;

the positioning tool comprises a prismatic vertical guide rod arranged at the upper end of the inner wall of the shell and a vertical positioning rod arranged on the vertical guide rod in a sliding manner, wherein the lower end of the positioning rod is provided with a positioning groove, and the positioning groove is used for being matched with a positioning block of a piston rod nut screwing structure;

screwing up mechanism, including rotating the sleeve that sets up in the casing and being used for driving sleeve pivoted rotary actuator, the sleeve cover is established outside the locating lever, and sleeve and locating lever are coaxial, can rotate relatively between sleeve and the locating lever, and telescopic lower extreme is equipped with the nut and screws up the groove, and the nut screws up the groove and is used for screwing up the nut cooperation of structure with piston rod nut.

And in the initial state, a limiting block on the positioning rod is supported on the upper end surface of the shaft shoulder and matched with the shaft shoulder.

When the electric wrench is used, the positioning groove on the positioning rod in the sleeve is matched with the positioning block on the piston rod, the electric wrench is quickly aligned to the piston rod, the nut is located in the nut tightening groove, the nut tightening groove is used for limiting the nut, and the nut is matched with the nut tightening groove. At the moment, the positioning rod moves upwards along the axial direction of the sleeve, the guide hole is matched with the vertical guide rod, and the guide hole moves upwards along the axial direction of the vertical guide rod along the vertical guide rod, so that the positioning accuracy of the electric wrench is improved. And when the switch is turned on, the rotary actuating mechanism drives the sleeve to rotate around the axial direction of the sleeve. The electric wrench is pressed downwards along the axial direction of the sleeve to push and rotate the nut, and the nut is screwed on the piston rod. The positioning rod in the sleeve increases the positioning effect of the electric wrench, so that the electric wrench can quickly and accurately position the piston rod. The electric wrench is stable in rotating the actuating mechanism, so that the stability of the sleeve in the process of screwing the nut is improved; the vibration and deviation of the sleeve when the nut is screwed are reduced, and therefore the service life of the electric wrench and the piston rod is prolonged.

Preferably, the upper end of the outer side wall of the positioning rod is provided with a limiting block, and the inner wall of the sleeve is provided with a shaft shoulder for supporting the limiting block on the shaft shoulder. The locating rod is prevented from falling from the sleeve.

Preferably, the upper end of the positioning rod is provided with a guide hole, and the guide hole is matched with the prismatic vertical guide rod. When the locating piece on the electric wrench location piston rod, guiding hole and the cooperation of the vertical guide arm of prismatic form, prismatic form locating piece and constant head tank cooperation, when sleeve pivoted, the locating lever does not produce the rotation for the casing, and the piston rod does not produce the rotation for the casing, has consequently increased the stability of nut tightening process, is difficult for causing the damage to the piston rod, increases the life of piston rod.

Preferably, the vertical guide rod is sleeved with a spring, and the spring is located between the upper end of the shell and the limiting block. When the electric wrench positions the piston rod, the positioning rod moves upwards along the axial direction of the sleeve, and the limiting block compresses the spring between the upper end of the shell and the limiting block. The spring generates pressing force to enable the positioning rod to be tightly matched with the piston rod, so that the stability of the positioning rod of the electric wrench is improved.

Preferably, when the limiting block is supported on the shaft shoulder, the lower end of the positioning rod extends out of the nut tightening groove. When the piston rod is thus positioned,

the locating piece on the piston rod can be quickly and accurately aligned with the locating groove on the locating rod in the electric wrench.

Preferably, the rotary actuator comprises a driving wheel driven by a motor and two parallel worms, a driven wheel is arranged on each worm, the driven wheel is meshed with the driving wheel, a helical gear is arranged on each sleeve, the worms are meshed with the helical gears, and the helical gears are located between the two parallel worms. Two parallel worms increase the stability of gear drive for electric wrench stable in structure.

Preferably, an upper bearing and a lower bearing are arranged in the shell, the sleeve is installed in the shell through the bearings, and the helical gear is located between the upper bearing and the lower bearing. The upper bearing and the lower bearing increase the stability of the rotation of the sleeve.

Therefore, the utility model has the following beneficial effects: (1) the electric wrench can accurately position and tighten the piston rod, so that the nut screwing efficiency is improved; (2) the electric wrench has stable structure and smooth transmission.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.

FIG. 3 is a schematic diagram of one configuration of the locating bar of FIG. 1.

Fig. 4 is a schematic structural diagram of a rotary actuator and a sleeve according to a second embodiment of the present invention.

In the figure: the screw rod comprises a rod body 1, a screw rod 2, a nut 3, a positioning block 4, a shell 5, a vertical guide rod 6, a positioning rod 7, a positioning groove 7.1, a limiting block 7.2, a guide hole 7.3, a sleeve 8, a nut tightening groove 9, a shaft shoulder 10, a spring 11, a driving wheel 12, a worm 13, a driven wheel 14, a helical gear 15 and a bearing 16.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the present invention is further described with reference to the accompanying drawings and the detailed description.

In the first embodiment, as shown in fig. 1, a piston rod nut 3 screwing structure includes a piston rod body 1, a screw rod 2 disposed at an upper end of the piston rod body 1, and a nut 3 engaged with the screw rod 2, wherein a prismatic positioning block 4 is disposed at a center of an upper end of the screw rod 2, and the positioning block 4, the screw rod 2, and the piston rod body 1 are in an integrally formed structure.

During the assembly, with the part assembly to screw rod 2 on, screw rod 2 upper end is equipped with locating piece 4, and electric wrench passes through 4 location piston rods of locating piece, opens the switch, and electric wrench screws up nut 3 on the screw rod 2 of piston rod through the screw thread. The positioning block 4 on the piston rod enables the electric wrench to quickly and accurately position the piston rod, and the stability of the electric wrench in the process of screwing or disassembling the nut 3 is improved. The hardness of the electric wrench is higher than that of the piston rod, the piston rod is provided with the positioning block 4, the strength of the piston rod screw rod 2 is increased, when the positioning block 4 is inserted into the electric wrench to screw the nut 3, the positioning block 4 is not easy to deform or break, and the service life of the piston rod is prolonged.

The piston rod nut 3 tightening structure shown in the above embodiment is provided with the positioning block 43 on the piston rod, and solves the problem that the nut 3 is easy to vibrate or deflect without positioning when being screwed by a wrench.

As shown in fig. 1, the positioning block 4 is a prism, and a polygonal prism, such as a triangular prism, a quadrangular prism, a pentagonal prism, etc., may be used. The positioning block 4 is matched with a positioning groove 7.1 on a limiting rod of the electric wrench.

Further, as shown in fig. 1, in the axial direction of the screw rod 2, the projection of the positioning block 4 on the upper end surface of the screw rod 2 falls within the upper end surface of the screw rod 2. The nut 3 is convenient to mount, and the shaft shoulder 10 between the positioning block 4 and the screw rod 2 is used for limiting the piston rod on the positioning rod 7.

Further, as shown in fig. 1, the outer diameter of the screw 2 is smaller than the outer diameter of the shaft 1. The limiting nut 3 is convenient to mount. And a shaft shoulder 10 between the rod body 1 and the screw rod 2 is used for limiting the nut 3 on the screw rod 2.

In a second embodiment, as shown in fig. 2, 3 and 4, an electric wrench for tightening a piston rod nut 3 in a tightening structure of the piston rod nut 3 according to any one of claims 1 to 3, comprises:

a housing 5;

the positioning tool comprises a prismatic vertical guide rod 6 arranged at the upper end of the inner wall of the shell 5 and a vertical positioning rod 7 arranged on the vertical guide rod 6 in a sliding manner, wherein a positioning groove 7.1 is formed in the lower end of the positioning rod 7, and the positioning groove 7.1 is used for being matched with a positioning block 4 of a piston rod nut 3 screwing structure;

screwing up mechanism, including rotating sleeve 8 that sets up in casing 5 and being used for driving sleeve 8 pivoted rotary actuator, sleeve 8 cover is established outside locating lever 7, and sleeve 8 is coaxial with locating lever 7, can rotate relatively between sleeve 8 and the locating lever 7, and the lower extreme of sleeve 8 is equipped with nut and screws up groove 9, and nut screws up groove 9 and is used for screwing up the nut 3 cooperation of structure with piston rod nut 3.

In an initial state, as shown in fig. 2, the limiting block 7.2 on the positioning rod 7 is supported on the upper end face of the shaft shoulder 10, and the limiting block 7.2 is matched with the shaft shoulder 10. The positioning rod 7 is prism-shaped and can adopt a polygonal prism structure such as a triangular prism, a quadrangular prism and the like.

When the electric wrench is used, the positioning groove 7.1 on the positioning rod 7 in the sleeve 8 is matched with the positioning block 4 on the piston rod, the electric wrench is quickly aligned to the piston rod, the nut 3 is positioned in the nut tightening groove 9, the nut tightening groove 9 is used for limiting the nut 3, and the nut 3 is matched with the nut tightening groove 9. At the moment, the positioning rod 7 moves upwards along the axial direction of the sleeve 8, the guide hole 7.3 is matched with the vertical guide rod 6, and the guide hole 7.3 moves upwards along the axial direction of the vertical guide rod 6 along the vertical guide rod 6, so that the positioning accuracy of the electric wrench is improved. And when the switch is turned on, the rotary actuating mechanism drives the sleeve 8 to rotate around the sleeve 8 axially. The electric wrench is pressed downwards along the axial direction of the sleeve 8, pushes and rotates the nut 3, and the nut 3 is screwed on the piston rod. The positioning rod 7 in the sleeve 8 increases the positioning effect of the electric wrench, so that the electric wrench can quickly and accurately position the piston rod. The electric wrench is stable in rotating the actuating mechanism, so that the stability of the sleeve 8 in the process of screwing the nut 3 is improved; the vibrations and deviations of the sleeve 8 when screwing the nut 3 are reduced, thus increasing the service life of the electric wrench and the piston rod.

The electric wrench for screwing the piston rod nut 3, which is shown in the embodiment, is provided with the positioning rod 7 in the sleeve 8, the positioning rod 7 is provided with the positioning groove 7.1, the positioning groove 7.1 is matched with the positioning block 4 of the piston rod, the piston rod is quickly and accurately positioned by the electric wrench, and the problem that the sleeve 8 is easy to vibrate or deflect without positioning when the nut 3 is screwed by the wrench is solved.

Further, as shown in fig. 2 and 3, a limiting block 7.2 is arranged at the upper end of the outer side wall of the positioning rod 7, and a shaft shoulder 10 is arranged on the inner wall of the sleeve 8 and used for supporting the limiting block 7.2 on the shaft shoulder 10. The inner diameter of the sleeve 8 between the upper end of the sleeve 8 and the shaft shoulder 10 is larger than the inner diameter between the lower end of the sleeve 8 and the shaft shoulder 10, so that the positioning rod 7 is prevented from falling from the sleeve 8.

Further, as shown in fig. 2 and 3, a guide hole 7.3 is formed at the upper end of the positioning rod 7, and the guide hole 7.3 is matched with the prismatic vertical guide rod 6. When locating block 4 on the electric wrench location piston rod, guiding hole 7.3 and the cooperation of prismatic vertical guide rod 6, prismatic locating block 4 and constant head tank 7.1 cooperation, when sleeve 8 pivoted, locating lever 7 does not produce the rotation for casing 5, and the piston rod does not produce the rotation for casing 5, has consequently increased the stability of nut 3 process of screwing up, is difficult for causing the damage to the piston rod, increases the life of piston rod.

Further, as shown in fig. 2, a spring 11 is sleeved on the vertical guide rod 6, and the spring 11 is located between the upper end of the housing 5 and the limiting block 7.2. When the electric wrench positions the piston rod, the positioning rod 7 moves upwards along the axial direction of the sleeve 8, and the limiting block 7.2 compresses the spring 11 between the upper end of the shell 5 and the limiting block 7.2. The spring 11 generates pressing force to enable the positioning rod 7 and the piston rod to be tightly matched, and therefore the stability of the positioning rod 7 of the electric wrench is improved.

Further, as shown in fig. 2, when the limiting block 7.2 is supported on the shaft shoulder 10, the lower end of the positioning rod 7 extends out of the nut tightening groove 9. Therefore, when the piston rod is positioned, the positioning block 4 on the piston rod can be quickly and accurately aligned with the positioning groove 7.1 on the positioning rod 7 in the electric wrench.

Further, as shown in fig. 2, when the limiting block 7.2 is supported on the shaft shoulder 10, the lower end of the vertical guide rod 6 is located in the guide hole 7.3.

Further, as shown in fig. 4, the rotary actuator includes a driving wheel 12 driven by a motor, and two parallel worms 13, where a driven wheel 14 is disposed on the worm, the driven wheel 14 is engaged with the driving wheel 12, a helical gear 15 is disposed on the sleeve 8, the worm 13 is engaged with the helical gear 15, and the helical gear 15 is located between the two parallel worms 13. The two parallel worms 13 increase the stability of the gear transmission, so that the electric wrench is stable in structure. The rotary actuating mechanism can adopt other structural forms such as gear transmission, belt transmission and the like. Other structures can be adopted on the sleeve 8 to be meshed with the rotary actuator for transmission.

Further, as shown in fig. 2, an upper bearing 16 and a lower bearing 16 are provided in the housing 5, the sleeve 8 is mounted in the housing 5 through the bearings 16, and the helical gear 15 is located between the upper bearing 16 and the lower bearing 16. The upper and lower bearings 16 increase the rotational stability of the sleeve 8. Other structures between the sleeve 8 and the housing 5 may be used to effect rotation of the sleeve 8.

The above embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereby. All equivalent changes in the shape and structure of the present invention are also intended to be included within the scope of the present invention.

Claims

1. The utility model provides a piston rod nut screws up structure, includes piston rod pole body (1), sets up screw rod (2) in pole body upper end, with screw rod complex nut (3), its characterized in that, the upper end center of screw rod is equipped with prismatic locating piece (4), locating piece, screw rod and pole body are integrated into one piece structure.

2. The piston rod nut tightening structure according to claim 1, wherein a projection of the positioning block onto the upper end surface of the screw in the axial direction of the screw falls within the upper end surface of the screw.

3. A piston rod nut tightening structure according to claim 1 or 2, wherein the outer diameter of the screw is smaller than the outer diameter of the shank.

4. An electric wrench for tightening a piston rod nut, for tightening a nut in a piston rod nut tightening structure according to any one of claims 1 to 3, comprising:

a housing (5);

the positioning tool comprises a prismatic vertical guide rod (6) arranged at the upper end of the inner wall of the shell and a vertical positioning rod (7) arranged on the vertical guide rod in a sliding manner, wherein a positioning groove (7.1) is formed in the lower end of the positioning rod and is used for being matched with a positioning block of a piston rod nut tightening structure;

screw up mechanism, including rotating sleeve (8) that set up in the casing and being used for driving sleeve pivoted rotary actuator, the sleeve cover is established outside the locating lever, and sleeve and locating lever are coaxial, can rotate relatively between sleeve and the locating lever, and telescopic lower extreme is equipped with nut and screws up groove (9), nut screws up the nut cooperation that the groove is used for screwing up the structure with piston rod nut.

5. The electric wrench for tightening the piston rod nut as claimed in claim 4, wherein a stopper (7.2) is provided at an upper end of an outer side wall of the positioning rod, and a shoulder (10) is provided on an inner wall of the sleeve for supporting the stopper on the shoulder.

6. An electric wrench for tightening nuts on piston rods according to claim 5, characterised in that the upper end of the positioning rod is provided with a guide hole (7.3) which cooperates with a prismatic vertical guide rod.

7. The electric wrench for tightening the piston rod nut as claimed in claim 5 or 6, wherein the vertical guide rod is sleeved with a spring (11), and the spring is positioned between the upper end of the shell and the limiting block.

8. The electric wrench for tightening a nut on a piston rod according to claim 5 or 6, wherein when the stopper is supported on the shoulder, the lower end of the positioning rod extends out of the nut tightening groove.

9. An electric wrench for tightening a piston rod nut as claimed in claim 4, wherein said rotary actuator comprises a drive wheel (12) driven by a motor, two parallel worms (13) having driven wheels (14) thereon, said driven wheels being engaged with the drive wheel, and a sleeve having a helical gear (15) thereon, said worm being engaged with the helical gear, the helical gear being located between the two parallel worms.

10. An electric wrench for tightening nuts on piston rods according to claim 4 or 9, characterised in that there are provided in said housing upper and lower bearings (16) through which the sleeve is mounted in the housing, and in that the bevel gear is located between the upper and lower bearings.