CN215569083U

CN215569083U - Measuring instrument for tunnel construction

Info

Publication number: CN215569083U
Application number: CN202121123316.1U
Authority: CN
Inventors: 黄晓冉; 高升; 郝秀花; 李山; 石明月; 刘师岐
Original assignee: CCCC Fourth Highway Engineering Co Ltd
Current assignee: CCCC Fourth Highway Engineering Co Ltd
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2022-01-18
Anticipated expiration: 2031-05-24

Abstract

The utility model relates to the technical field of bridge and tunnel construction equipment, and discloses a measuring instrument for tunnel construction, which comprises a support assembly and a measuring main body, wherein the support assembly comprises a mounting plate, one surface of the mounting plate, facing the ground, is rotatably connected with three groups of telescopic supporting legs, a lifting assembly is fixedly mounted on the mounting surface of the mounting plate through hexagon socket head bolts, the lifting assembly comprises a case, and one surface of the case, facing the mounting plate, is communicated with a fixed sleeve. This measuring apparatu for tunnel construction through lifting unit, when the operation is adjusted to the height of measuring the main part to needs, waves the hand wheel and drives the actuating lever rotatory, and the actuating lever passes through the worm and drives the worm wheel rotatory along the pressure-bearing, and the worm wheel passes through the lift lead screw and drives and measure the main part rebound, has improved the convenience of highly adjusting the device, has shortened measuring time, has improved measurement of efficiency to the practicality of device has been strengthened.

Description

Measuring instrument for tunnel construction

Technical Field

The utility model relates to the technical field of bridge and tunnel construction equipment, in particular to a measuring instrument for tunnel construction.

Background

Through retrieval, the Chinese patent number CN207963884U discloses a measuring instrument for bridge and tunnel construction, which relates to the technical field of bridge and tunnel construction equipment, in particular to a measuring instrument for bridge and tunnel construction; the measuring instrument for bridge and tunnel construction comprises a total station body and a tripod, and further comprises a bottom plate, a nut, a threaded inserted rod, a support, a rotating shaft, a pointer, two sleeves and two supporting columns; the total station body is easy to mount on a tripod, convenient to adjust, capable of effectively saving time and improving working efficiency.

When the measuring instrument for tunnel construction in the prior art is used, the measuring equipment is fixedly arranged on a measuring point through the support component, the measuring equipment is leveled after being stably installed, the measuring assembly is leveled for measurement, and the device frequently needs two sets of operators to repeatedly measure with the measuring point in the using process, but because the heights of the two sets of operators often have great differences, the height of the device is repeatedly adjusted, the measuring time is prolonged, the measuring efficiency is reduced, and the practicability of the device is influenced.

Based on the above, the utility model designs a measuring instrument for tunnel construction to solve the problems.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Aiming at the defects of the prior art, the utility model provides a measuring instrument for tunnel construction, which solves the problems in the background technology.

(II) technical scheme

In order to achieve the purpose, the utility model provides the following technical scheme: a measuring instrument for tunnel construction comprises a support component and a measuring main body, wherein the support component comprises a mounting plate, three groups of telescopic supporting legs are rotatably connected to one surface of the mounting plate facing the ground, a lifting component is fixedly mounted on the mounting surface of the mounting plate through hexagon socket head cap screws and comprises a case, one surface of the case facing the mounting plate is communicated with a fixing sleeve, bearing sleeves are arranged on the upper side and the lower side of the inner wall of the case, a bearing is inserted in each group of the bearing sleeves, a worm wheel is arranged between the two groups of bearing bearings, a lifting lead screw is arranged on one surface of the worm wheel facing the mounting plate in a penetrating manner, a worm is meshed with the worm wheel in a transmission manner, two groups of driving rods are arranged on the case in a penetrating manner, one end of each group of the driving rods penetrating into the case is fixedly connected with the input end of the worm, and a hand wheel is arranged at the outer end of each group of the driving rods, the top end of the lifting screw rod is rotatably connected with a bearing plate through a clamping block, the top of the bearing plate is inserted with a connecting column, locking bolts penetrate through the upper threads of the bearing plate, one end of each group of locking bolts penetrating into the bearing plate is provided with a fixing pin, the connecting column is provided with three groups of fixing holes for inserting the fixing pins, the measuring main body is fixedly installed with the connecting column through a mounting bolt column, the mounting plate is provided with a fixing seat, the bottom threads of the fixing seat penetrate through modified bolts, the back surface of the supporting leg on the front side is fixedly provided with a modified precast plate through bolts and nuts, one surface of the modified precast plate, which is attached to the supporting leg, is provided with a sliding slot hole for inserting the modified bolts and can be in sliding connection along the modified, one surface of the mounting plate, which faces the ground, is provided with two groups of mounting bolts through bolts, and one surface of the mounting plate, which faces the ground, is provided with modified threaded holes, the bearing plate is provided with two groups of moving handles, and each group of moving handles is sleeved with a moving handle sleeve for improving the friction coefficient.

Preferably, one side of each hand wheel, which faces away from the worm, is provided with a handle rod, and the outer surface of each handle rod is rotatably connected with a rotary sleeve.

Preferably, the thread angles of the mounting bolt stud and the modified bolt are 55 degrees, and the thread sizes of the mounting bolt stud and the modified bolt are 5/8 inches.

Preferably, one end of the lifting screw rod, which faces the ground, is provided with a buffer sleeve in a threaded manner, and a flexible buffer ring is arranged on the buffer sleeve.

Preferably, the upper side and the lower side of the outer side surface of each group of the support legs are respectively provided with a flexible anti-smashing plate for reducing damage of the support legs in the collision process.

Preferably, the front side of the support leg is provided with a collecting and tying belt, and the outer side surface and the inner side surface of the collecting and tying belt are both provided with nylon magic tapes.

Preferably, every group the one end that the fixed pin penetrated the fixed orifices all is equipped with the outer chamfer of being convenient for to insert the closure, every group the input of fixed orifices all is equipped with the interior chamfer that improves the fixed pin and insert the closure.

Preferably, every group the lateral surface of stabilizer blade all is equipped with and is used for reducing operating personnel and leads to measuring the warning light of main part horizontal migration because of touching the stabilizer blade.

Preferably, the inner wall of the fixed sleeve is provided with a removing thread for removing dust particles in a thread gap of the lifting screw rod.

Preferably, the graphite calcium-based lubricating grease for reducing mechanical wear between the worm wheel and the worm is arranged in the case.

(III) advantageous effects

Compared with the prior art, the utility model provides a measuring instrument for tunnel construction, which has the following beneficial effects:

1. this measuring apparatu for tunnel construction through lifting unit, when the operation is adjusted to the height of measuring the main part to needs, waves the hand wheel and drives the actuating lever rotatory, and the actuating lever passes through the worm and drives the worm wheel rotatory along the pressure-bearing, and the worm wheel passes through the lift lead screw and drives and measure the main part rebound, has improved the convenience of highly adjusting the device, has shortened measuring time, has improved measurement of efficiency to the practicality of device has been strengthened.

2. According to the measuring instrument for tunnel construction, through the mounting bolts, the modified prefabricated plates and the modified bolts, when the device does not need a lifting function, the lifting assembly is detached from the support assembly through the hexagon socket head cap bolts, then the modified prefabricated plates are fixedly mounted at the bottom of the mounting plate through the two sets of mounting bolts and the modified threaded holes, and then the measuring main body is fixedly mounted on the mounting plate through the modified bolts and the modified threaded holes, so that the convenience of modification of the device is improved, the adaptability of the device to an original production line is improved, and the utilization rate of original accessories is improved.

3. This measuring apparatu for tunnel construction, through removing handle and fixture block, it is rotatory along the fixture block to make the convenient drive of operating personnel accept the board, accepts the board and drives the detection end alignment measuring position who measures the main part, has reduced operating personnel and has measured the probability that the end leads to its main part skew because of the rotational movement, and the cooperation is removed the handle cover, has improved operating personnel and has removed the coefficient of friction of handle, has reduced operating personnel and has used the probability that removes the handle and skid to the practicality of device has been strengthened.

Drawings

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

FIG. 2 is a cross-sectional view of the structure of the present invention;

FIG. 3 is an exploded perspective view of the structure of the present invention;

fig. 4 is a bottom view of the structure of the present invention.

In the figure: 1. a bracket assembly; 2. a measurement subject; 3. mounting a plate; 4. a support leg; 5. fixing the sleeve; 6. A lifting assembly; 7. a chassis; 8. a bearing sleeve; 9. a pressure bearing; 10. a worm gear; 11. a lifting screw rod; 12. a worm; 13. a drive rod; 14. a hand wheel; 15. a clamping block; 16. a bearing plate; 17. connecting columns; 18. installing a bolt column; 19. a locking bolt; 20. a fixing pin; 21. a fixed seat; 22. modifying the bolt; 23. modifying the prefabricated plate; 24. a sliding slot hole; 25. installing a bolt; 26. modifying a threaded hole; 27. Moving the handle; 28. moving the handle sleeve; 29. a handle bar; 30. rotating the sleeve; 31. a buffer sleeve; 32. A flexible buffer ring; 33. a flexible anti-smashing plate; 34. a binding belt is collected; 35. nylon magic tape; 36. a warning light.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Referring to fig. 1-4, the present invention provides a technical solution: a measuring instrument for tunnel construction comprises a support component 1 and a measuring main body 2, wherein the support component 1 comprises a mounting plate 3, one surface of the mounting plate 3 facing the ground is rotatably connected with three groups of telescopic supporting legs 4, the mounting surface of the mounting plate 3 is fixedly provided with a lifting component 6 through an inner hexagon bolt, through the lifting component 6, when the height of the measuring main body 2 needs to be adjusted, a hand wheel 14 is shaken to drive a driving rod 13 to rotate, the driving rod 13 drives a worm wheel 10 to rotate along a bearing 9 through a worm 12, the worm wheel 10 drives the measuring main body 2 to move upwards through a lifting lead screw 11, the convenience for adjusting the height of the device is improved, the measuring time is shortened, the measuring efficiency is improved, the practicability of the device is enhanced, the lifting component 6 comprises a case 7, one surface of the case 7 facing the mounting plate 3 is communicated with a fixed sleeve 5, the upper side and the lower side of the inner wall of the case 7 are both provided with bearing sleeves 8, bearing bearings 9 are inserted in each group of bearing sleeves 8, a worm wheel 10 is arranged between the two groups of bearing bearings 9, a lifting screw rod 11 penetrates through one side of the worm wheel 10 facing the mounting plate 3 in a threaded manner, a worm 12 is engaged with the worm wheel 10 in a transmission manner, two groups of driving rods 13 penetrate through the case 7, one end of each group of driving rods 13 penetrating through the case 7 is fixedly connected with the input end of the worm 12, a hand wheel 14 is arranged at the outer end of each group of driving rods 13, a bearing plate 16 is rotatably connected to the top end of the lifting screw rod 11 through a clamping block 15, an operator can conveniently drive the bearing plate 16 to rotate along the clamping block 15 by moving a handle 27 and the clamping block 15, the bearing plate 16 drives the detection end of the measuring main body 2 to align with the measuring position, the probability that the main body of the operator deviates due to the rotary movement of the detection end of the measuring main body 2 is reduced, a connecting column 17 is inserted at the top of the bearing plate 16, and a locking bolt 19 penetrates through the threads on the bearing plate 16, the end of each group of locking bolts 19 penetrating through the bearing plate 16 is provided with a fixing pin 20, the connecting column 17 is provided with three groups of fixing holes for inserting the fixing pins 20, the measuring main body 2 is fixedly installed with the connecting column 17 through an installing bolt column 18, the installing plate 3 is provided with a fixing seat 21, the bottom of the fixing seat 21 is threaded with a modified bolt 22, the back of the front side supporting leg 4 is fixedly provided with a modified precast slab 23 through a bolt and a nut, the surface, attached to the supporting leg 4, of the modified precast slab 23 is provided with a sliding groove hole 24 for inserting the modified bolt 22 and capable of sliding connection along the modified precast slab 23, the surface, facing the ground, of the installing plate 3 is provided with two groups of installing bolts 25 in a threaded manner, when the lifting function of the device is not required, the lifting component 6 is firstly detached from the bracket component 1 through an inner hexagon bolt, and then the modified precast slab 23 is fixedly installed on the installing plate 3 through the two groups of installing bolts 25 and the modified threaded holes 26 The bottom, will measure on main part 2 fixed mounting 3 through modification bolt 22 and slotted hole 24 will be followed, the convenience of device modification has been improved, the suitability of device and former production line has been improved, the utilization ratio of original accessory has been improved, modification screw hole 26 has been seted up towards the one side on ground to mounting panel 3, be equipped with two sets of removal handles 27 on the accepting board 16, all the cover is equipped with the removal handle cover 28 that is used for improving coefficient of friction on every group removal handle 27, cooperation removal handle cover 28, the coefficient of friction of operating personnel with removal handle 27 has been improved, the probability that operating personnel skidded in use removal handle 27 has been reduced, thereby the practicality of device has been strengthened.

In the utility model, in order to improve the comfort of using the hand wheel 14, the handle rods 29 are arranged on the side, opposite to the worm 12, of each group of hand wheels 14, the outer surface of each group of handle rods 29 is rotatably connected with a rotating sleeve 30, and an operator can quickly and conveniently rotate the hand wheel 14 by rotating the sleeve 30, so that the comfort of using the hand wheel 14 is improved.

In the present invention, in order to improve the interchangeability of the apparatus, the thread sizes of the mounting bolt column 18 and the modified bolt 22 are 5/8 inches which are made of English and are the general connection size of the apparatus, respectively, in the case that the thread angles of the mounting bolt column 18 and the modified bolt 22 are 55 degrees which are in accordance with the English thread standard, thereby improving the interchangeability of the apparatus.

In the utility model, in order to reduce the collision probability between the lifting screw rod 11 and the support leg 4, a buffer sleeve 31 is screwed at one end of the lifting screw rod 11 facing the ground, and a flexible buffer ring 32 for reducing the collision probability between the lifting screw rod 11 and the support leg 4 is arranged on the buffer sleeve 31, so that the collision probability between the lifting screw rod 11 and the support leg 4 is reduced.

In the utility model, in order to reduce the probability of damage of the support legs 4 due to collision, the upper side and the lower side of the outer side surface of each group of support legs 4 are respectively provided with the flexible anti-smashing plates 33 for reducing the damage of the support legs 4 in the collision process, so that the probability of damage of the support legs 4 due to collision is reduced.

In the utility model, in order to improve the convenience of the bracket component 1 in bundling, the front surface of the front side support leg 4 is provided with the collecting belt 34, and the outer side surface and the inner side surface of the collecting belt 34 are both provided with nylon magic tapes 35 for connecting two ends of the collecting belt 34, so that the convenience of the bracket component 1 in bundling is improved.

In the utility model, in order to improve the accuracy of inserting the fixing pins 20, the end of each group of fixing pins 20 penetrating into the fixing holes is provided with an outer chamfer convenient for inserting, and the input end of each group of fixing holes is provided with an inner chamfer improving the inserting of the fixing pins 20, so that the accuracy of inserting the fixing pins 20 is improved.

In the utility model, in order to reduce the probability of horizontal deviation of the measuring main body 2 caused by the fact that an operator touches the support legs 4, the warning lamps 36 for reducing the horizontal deviation of the measuring main body 2 caused by the fact that the operator touches the support legs 4 are arranged on the outer side face of each group of support legs 4, the convenience of observing the positions of the support legs 4 by the operator is improved, and the probability of horizontal deviation of the measuring main body 2 caused by the fact that the operator touches the support legs 4 is reduced.

In the utility model, in order to reduce the influence of dust particles on the precision of the lifting assembly 6, the inner wall of the fixed sleeve 5 is provided with the cleaning thread for cleaning the dust particles in the thread gap of the lifting screw rod 11, so that the quantity of the dust particles entering the lifting assembly 6 is reduced, and the influence of the dust particles on the precision of the lifting assembly 6 is reduced.

In the present invention, in order to prolong the service life of the lifting assembly 6, the graphite calcium-based grease for reducing the mechanical wear between the worm wheel 10 and the worm 12 is provided in the case 7, so that the wear rate of the worm wheel 10 and the worm 12 is reduced, and the service life of the lifting assembly 6 is prolonged.

The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like.

When the device is used, firstly, the device is fixedly arranged at a rated position, then, the bracket component 1 is fixed to a measuring point through the support leg 4, the connecting column 17 is arranged on the mounting surface of the measuring main body 2 through the mounting bolt column 18 after the bracket component 1 is stably arranged, the connecting column 17 is fixedly arranged on the bearing plate 16 through the locking bolt 19 and the fixing pin 20 after being mounted, the measuring main body 2 is calibrated through the body after being mounted, the measuring operation is carried out after the calibration is finished, when the height of the measuring main body 2 needs to be adjusted, the driving rod 13 is driven to rotate through the hand wheel 14, the driving rod 13 drives the worm wheel 10 to rotate along the bearing 9 through the worm 12, the worm wheel 10 drives the measuring main body 2 to move upwards through the lifting screw rod 11, the bearing plate 16 is driven to rotate along the fixture block 15 through the moving handle 27 and the moving handle sleeve 28 after the measuring main body 2 is moved to the rated position, the bearing plate 16 drives the detection end of the measuring main body 2 to align with a measuring position, when the device does not need a lifting function, the lifting assembly 6 is firstly detached from the bracket assembly 1 through the hexagon socket head cap screw, after the lifting assembly 6 is detached, the two groups of mounting bolts 25, the modified prefabricated plate 23 and the modified bolts 22 are detached from the bracket assembly 1, after the detachment is completed, the modified prefabricated plate 23 is fixedly mounted at the bottom of the mounting plate 3 through the two groups of mounting bolts 25 and the modified threaded holes 26, after the modified prefabricated plate 23 is mounted, the measuring main body 2 is fixedly mounted on the mounting plate 3 through the modified bolts 22 and the sliding slot holes 24, and after the modification operation is completed, the subsequent operation is carried out.

To sum up, this measuring apparatu for tunnel construction through lifting unit 6, when the operation is adjusted to the height of measuring main part 2 to needs, waves hand wheel 14 and drives actuating lever 13 rotatory, and actuating lever 13 drives worm wheel 10 through worm 12 and rotates along pressure-bearing 9, and worm wheel 10 drives through lift lead screw 11 and measures main part 2 rebound, has improved the convenience of highly adjusting the device, has shortened measuring time, has improved measurement of efficiency to the practicality of device has been strengthened.

According to the measuring instrument for tunnel construction, through the mounting bolts 25, the modified prefabricated plate 23 and the modified bolts 22, when the device does not need a lifting function, the lifting assembly 6 is firstly detached from the bracket assembly 1 through the hexagon socket head cap screws, then the modified prefabricated plate 23 is fixedly mounted at the bottom of the mounting plate 3 through the two groups of mounting bolts 25 and the modified threaded holes 26, and then the measuring main body 2 is fixedly mounted on the mounting plate 3 through the modified bolts 22 and the sliding slot holes 24, so that the convenience of device modification is improved, the adaptability of the device to an original production line is improved, and the utilization rate of original accessories is improved.

This measuring apparatu for tunnel construction, through removing handle 27 and fixture block 15, make the convenient drive of operating personnel accept board 16 rotatory along fixture block 15, accept board 16 and drive the detection end alignment measuring position of measuring main part 2, reduced the probability that operating personnel leads to its main part skew because of the rotatory removal measuring main part 2 detection end, cooperation removal cover 28 has improved operating personnel and removal handle 27's coefficient of friction, reduced the probability that operating personnel skidded using removal handle 27, thereby the practicality of device has been strengthened.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a measuring apparatu for tunnel construction, includes bracket component (1) and measures main part (2), bracket component (1) includes mounting panel (3), mounting panel (3) are rotated towards the one side on ground and are connected with three telescopic stabilizer blades of group (4), its characterized in that: the mounting surface of the mounting plate (3) is fixedly provided with a lifting assembly (6) through hexagon socket head cap screws, the lifting assembly (6) comprises a case (7), one side of the case (7) facing the mounting plate (3) is communicated with a fixing sleeve (5), the upper side and the lower side of the inner wall of the case (7) are respectively provided with a bearing sleeve (8), each bearing sleeve (8) is internally inserted with a bearing (9), a worm wheel (10) is arranged between the two groups of bearing bearings (9), one side of the worm wheel (10) facing the mounting plate (3) is threaded with a lifting lead screw (11), the worm wheel (10) is in transmission meshing with a worm (12), two groups of driving rods (13) are penetrated on the case (7), one end of each group of the driving rods (13) penetrating the case (7) is fixedly connected with the input end of the worm (12), and the outer end of each group of the driving rods (13) is provided with a hand wheel (14), the top of lift lead screw (11) is rotated through fixture block (15) and is connected with and accepts board (16), it has spliced pole (17) to accept the top grafting of board (16), accept board (16) and go up the screw thread and wear to be equipped with locking bolt (19), every group locking bolt (19) penetrate the one end of accepting board (16) and all are equipped with fixed pin (20), set up three fixed orificess that supply fixed pin (20) to insert on spliced pole (17), measure main part (2) through erection bolt post (18) and spliced pole (17) fixed mounting, be equipped with a fixing base (21) on mounting panel (3), the bottom screw thread of fixing base (21) is worn to be equipped with modification bolt (22), the front side there is modification prefabricated plate (23) at the back of stabilizer blade (4) through bolt and nut fixed mounting, modification prefabricated plate (23) and the one side of stabilizer blade (4) laminating are seted up and are supplied modification bolt (22) to insert the one side of closing, And can follow modification prefabricated plate (23) sliding connection's sliding groove hole (24), mounting panel (3) are equipped with two sets of mounting bolt (25) towards one side spiral shell on ground, modification screw hole (26) have been seted up towards one side on ground in mounting panel (3), be equipped with two sets of removal handle (27) on accepting board (16), every group all the cover is equipped with removal handle cover (28) that are used for improving coefficient of friction on removing handle (27).

2. The measuring instrument for tunnel construction according to claim 1, wherein: and one surface of each hand wheel (14) back to the worm (12) is provided with a handle rod (29), and the outer surface of each handle rod (29) is rotatably connected with a rotary sleeve (30).

3. The measuring instrument for tunnel construction according to claim 1, wherein: the thread angles of the mounting bolt column (18) and the modified bolt (22) are both 55 degrees, and the thread sizes of the mounting bolt column (18) and the modified bolt (22) are both 5/8 inches.

4. The measuring instrument for tunnel construction according to claim 1, wherein: one end of the lifting screw rod (11) facing the ground is provided with a buffer sleeve (31) in a threaded manner, and a flexible buffer ring (32) is arranged on the buffer sleeve (31).

5. The measuring instrument for tunnel construction according to claim 1, wherein: and the upper side and the lower side of the outer side surface of each group of the support legs (4) are respectively provided with a flexible anti-smashing plate (33) for reducing the damage of the support legs (4) in the collision process.

6. The measuring instrument for tunnel construction according to claim 1, wherein: the front side the front of stabilizer blade (4) is equipped with receives and ties area (34), the lateral surface and the medial surface of receiving and tying area (34) all are equipped with nylon magic subsides (35).

7. The measuring instrument for tunnel construction according to claim 1, wherein: every group the one end that fixed pin (20) penetrated the fixed orifices all is equipped with the outer chamfer of being convenient for to insert the closure, every group the input of fixed orifices all is equipped with the interior chamfer that improves fixed pin (20) and insert the closure.

8. The measuring instrument for tunnel construction according to claim 1, wherein: every group the lateral surface of stabilizer blade (4) all is equipped with and is used for reducing operating personnel and leads to measuring warning light (36) of main part (2) horizontal migration because of touching stabilizer blade (4).

9. The measuring instrument for tunnel construction according to claim 1, wherein: the inner wall of the fixed sleeve (5) is provided with a removing thread for removing dust particles in a thread gap of the lifting screw rod (11).

10. The measuring instrument for tunnel construction according to claim 1, wherein: and graphite calcium-based lubricating grease for reducing mechanical wear between the worm wheel (10) and the worm (12) is arranged in the case (7).