Novel differential bearing gasket measuring device

Abstract

The invention discloses a novel differential bearing gasket measuring device which comprises a frame body, a net rack is fixedly connected to the edge of the upper side of the frame body, a display is fixedly connected to the right side of the net rack, and a shell reduction bearing installation position measuring mechanism and a differential assembly bearing measuring mechanism are fixedly connected to the upper side of the frame body. The reduction housing bearing mounting position measuring mechanism comprises a jacking device, an L1 measuring device and a pressing device, and the differential assembly bearing measuring mechanism comprises a supporting device, an L2 measuring device and a sliding device. Through the above structure, L1 is measured by the shell reduction bearing installation position measuring mechanism, L2 is measured by the differential assembly bearing measuring mechanism, finally, the thickness of the gasket is calculated through L = L1-L2, and in the measuring process, the measuring head has a certain floating amount, so that errors caused by poor contact of a measured surface are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automobile manufacturing, and in particular to a novel differential bearing gasket measuring device. Background Art

[0002] The automobile differential is a mechanism that enables the left and right (or front and rear) driving wheels to rotate at different speeds. It is mainly composed of left and right axle gears, two planetary gears and a gear rack. The function is to make the left and right wheels roll at different speeds when the car turns or drives on uneven roads, that is, to ensure that the driving wheels on both sides perform pure rolling motion; the planetary gears and axle gears of the differential are spur gears and are assembled at a vertical angle. When the left and right wheels of the car produce a differential, they roll relative to each other. Due to the limitations of spur teeth and installation angles, the tooth side clearance of the planetary gears and axle gears is large when transmitting torque, which is prone to eccentric load and transitional wear, resulting in problems such as broken teeth and tooth surface sintering, which affects the driving of the car; the differential housing is made of cast iron material, and the axle gears wear quickly when rotating. By adding gaskets, the wear of the differential housing can be greatly reduced and the life of the differential can be extended. Therefore, the precision measurement of differential gaskets is extremely important. A new differential bearing gasket measuring device is proposed. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a novel differential bearing gasket measuring device, which solves the problems of low measurement accuracy, high cost and low efficiency.

[0004] The present invention also provides a novel differential bearing gasket measuring device as described above, comprising a frame, a grid fixedly connected to the upper edge of the frame, a display fixedly connected to the right side of the grid, a shell bearing installation position measuring mechanism and a differential assembly bearing measuring mechanism fixedly connected to the upper side of the frame, the shell bearing installation position measuring mechanism comprising three parts: a lifting device, an L1 measuring device and a clamping device, and the differential assembly bearing measuring mechanism comprising three parts: a supporting device, an L2 measuring device and a sliding device.

[0005] According to the novel differential bearing gasket measuring device, the lifting device includes a lifting cylinder, a lifting cylinder mounting plate is fixedly connected to the upper side of the lifting cylinder, guide shafts are fixedly connected to both ends of the lifting cylinder mounting plate, a sliding plate is slidably connected to the upper end of the guide shaft, an L1 linear bearing and a measuring sensor mounting bracket are fixedly connected to the upper side of the sliding plate, a large base plate is fixedly connected to the upper end of the L1 linear bearing, a cylinder connector is fixedly connected to the output end of the lifting cylinder, the L1 measuring device includes an L1 linear rail, a lifting cylinder mounting plate is fixedly connected to the lower side of the L1 linear rail, and an L1 linear rail slider is slidably connected to the upper side, measuring feed cylinder mounting plates are fixedly connected to the left and right sides of the L1 linear rail, a measuring feed cylinder is fixedly connected to the measuring feed cylinder mounting plate, and a measuring feed cylinder connector is fixedly connected to the output end of the measuring feed cylinder. The measuring feed cylinder connector, the upper side of the L1 linear rail slider is fixedly connected with a rotating shaft, a bearing mounting seat and a thrust ball bearing, the upper side of the rotating shaft is fixedly connected with a probe mounting bracket, the probe mounting bracket is fixedly connected with a probe, the inner side of the rotating shaft is fixedly connected with a linear rail slide, the inner side of the linear rail slide is fixedly connected with a spring plunger mounting plate, the upper side of the spring plunger mounting plate is fixedly connected with a spring plunger, the measuring sensor mounting bracket is fixedly connected with a displacement sensor, the displacement sensor is in contact with the spring plunger mounting plate, the clamping device includes a clamping cylinder, the upper side of the clamping cylinder is fixedly connected with a large base plate, the upper side of the large base plate is fixedly connected with a clamping cylinder mounting plate and a product positioning flange, the output end of the clamping cylinder is fixedly connected with a cylinder connector, the upper side of the cylinder connector is hinged with a pressure rod, and one end of the pressure rod is fixedly connected with a pressure head.

[0006] According to the novel differential bearing gasket measuring device, the sliding device includes a column, a column cover plate is fixedly connected to the outer side of the column, and a lifting cylinder mounting plate is fixedly connected to the upper side, a lifting cylinder is fixedly connected to the lifting cylinder mounting plate, a cylinder floating joint is fixedly connected to the output end of the lifting cylinder, an L2 linear rail is fixedly connected to the front side of the column, a linear rail side top block and an L2 linear rail slider are fixedly connected to the L2 linear rail, a lifting slide plate is fixedly connected to the outer side of the L2 linear rail slider, a tank drag chain is provided on the right side of the lifting cylinder, a hard limit mounting seat is provided below the tank drag chain, a hard limit shaft is fixedly connected to the outer side of the hard limit mounting seat, and the inner side is fixedly connected to the column, and the L2 measuring device includes a lifting bracket, and a protective The cover, the outer side of the lifting slide is fixedly connected to the lifting bracket, the bottom of the lifting bracket is fixedly connected with a linear bearing, the upper end of the linear bearing is fixedly connected with a floating guide shaft, a measuring sensor is provided between the two linear bearings, a floating spring is provided under the lifting bracket, the lower end of the floating spring is fixedly connected with a measuring block, and a floating plate is fixedly connected under the measuring block. The supporting device includes a bottom plate, a lower positioning seat mounting plate is fixedly connected to the upper side of the bottom plate, a lower positioning seat is fixedly connected to the upper side of the lower positioning seat mounting plate, a lower centering shaft is fixedly connected in the middle of the lower positioning seat, a floating fixed shaft is fixedly connected under the floating plate, a floating head is floatingly connected under the floating fixed shaft, a large steel ball is provided between the floating fixed shaft and the floating head, and springs and small steel balls are provided on both sides of the floating head.

[0007] According to the novel differential bearing gasket measuring device, an adjusting block is provided on the lower positioning seat mounting plate.

[0008] According to the novel differential bearing gasket measuring device, a measuring port adapted to the shell reduction small assembly is provided in the middle of the large bottom plate.

[0009] The present invention has the following beneficial effects: In the present invention, L1 is measured by the shell bearing installation position measuring mechanism, and then L2 is measured by the differential assembly bearing measuring mechanism. Finally, the thickness of the gasket is calculated by L=L1-L2. During the measurement process, the measuring head has a certain floating amount to reduce the error caused by poor contact of the measured surface.

[0010] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention is further described below in conjunction with the accompanying drawings and embodiments; Figure 1 This is a structural diagram of a novel differential bearing gasket measuring device of the present invention; Figure 2 This is a structural diagram of a novel differential bearing gasket measuring device and a housing bearing installation position measuring mechanism of the present invention; Figure 3 It is a front view of a measuring mechanism for the reduced-shell bearing installation position of a novel differential bearing gasket measuring device of the present invention; Figure 4 A cross-sectional view of a measuring mechanism for the reduced-shell bearing installation position of a novel differential bearing gasket measuring device of the present invention; Figure 5 This is a structural diagram of a differential assembly bearing measuring mechanism of a novel differential bearing gasket measuring device of the present invention; Figure 6 It is a front view of a differential assembly bearing measuring mechanism of a novel differential bearing gasket measuring device of the present invention; Figure 7 It is a side view of a differential assembly bearing measuring mechanism of a novel differential bearing gasket measuring device of the present invention; Figure 8 The present invention provides a cross-sectional view of a differential assembly bearing measuring mechanism of a novel differential bearing gasket measuring device.

[0012] Legend: 1. Frame; 2. Measuring mechanism for the installation position of the shell bearing; 21. Lifting device; 211. Lifting cylinder; 212. Lifting cylinder mounting plate; 213. Guide shaft; 214. Cylinder connector; 215. Sliding plate; 216. L1 linear bearing; 22. L1 measuring device; 221. L1 linear rail; 222. L1 linear rail slider; 223. Measuring feed cylinder connector; 224. Rotating axis; 225. Probe mounting bracket; 226. Probe; 227. Thrust ball bearing; 228. Bearing mounting seat; 229, small locking nut; 2210, displacement sensor; 2211, measuring feed cylinder mounting plate; 2212, spring plunger; 2213, linear rail slide; 2214, spring plunger mounting plate; 2215, measuring feed cylinder; 23, clamping device; 231, clamping cylinder; 232, large base plate; 233, clamping cylinder mounting plate; 234, cylinder connector; 235, pressure rod; 236, pressure head; 237, product positioning flange; 24, shell reduction small assembly; 3. Differential assembly bearing measuring mechanism; 31. Support device; 311. Bottom plate; 312. Lower positioning seat mounting plate; 313. Lower positioning seat; 314. Lower centering shaft; 315. Floating head; 316. Large steel ball; 317. Spring; 318. Small steel ball; 319. Floating fixed shaft; 32. L2 measuring device; 321. Floating plate; 322. Measuring block; 323. Floating spring; 324. L2 linear bearing; 325. Floating guide shaft; 326. Measuring sensor; 327 , lifting bracket; 328, protective cover; 329, adjustment block; 33, sliding device; 331, column; 332, column cover; 333, lifting cylinder mounting plate; 334, lifting cylinder; 335, cylinder floating joint; 336, L2 linear rail; 337, linear rail side top block; 338, tank drag chain; 339, L2 linear rail slider; 3310, lifting slide plate; 3311, hard limit shaft; 3312, hard limit mounting seat; 34, differential assembly; 4, grid; 5, display. Implementation

[0013] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0014] Reference Figure 1-8The embodiment of the present invention is a novel differential bearing gasket measuring device, which includes a frame 1, a grid 4 is fixedly connected to the upper edge of the frame 1, a display 5 is fixedly connected to the right side of the grid 4, and the gasket measurement value can be accurately read through the display 5. The upper side of the frame 1 is fixedly connected to a shell reduction bearing installation position measuring mechanism 2 and a differential assembly bearing measuring mechanism 3. The shell reduction bearing installation position measuring mechanism 2 measures the value of the L1 shell reduction small assembly 24, and then the differential assembly bearing measuring mechanism 3 measures the value of the L2 differential assembly 34. The shell reduction bearing installation position measuring mechanism 2 includes three parts: a lifting device 21, an L1 measuring device 22 and a pressing device 23. The lifting device 21 The lifting cylinder 211 includes a lifting cylinder 211, a lifting cylinder mounting plate 212 is fixedly connected to the upper side of the lifting cylinder 211, guide shafts 213 are fixedly connected to both ends of the lifting cylinder mounting plate 212, a sliding plate 215 is slidably connected to the upper end of the guide shaft 213, an L1 linear bearing 216 and a measuring sensor mounting bracket are fixedly connected to the upper side of the sliding plate 215, a large bottom plate 232 is fixedly connected to the upper end of the L1 linear bearing 216, a cylinder connector 214 is fixedly connected to the output end of the lifting cylinder 211, and an L1 measuring device 22 includes an L1 linear rail 221, a lower side of the L1 linear rail 221 is fixedly connected to the lifting cylinder mounting plate 212, and an L1 linear rail slider 222 is slidably connected to the upper side, and the L1 linear rail The left and right sides of 221 are fixedly connected with measuring feed cylinder mounting plates 2211, and the measuring feed cylinder mounting plates 2211 are fixedly connected with measuring feed cylinders 2215, and the output end of the measuring feed cylinder 2215 is fixedly connected with a measuring feed cylinder connector 223, and the measuring feed cylinder connector 223, the upper side of the L1 linear rail slider 222 is fixedly connected with a rotating shaft 224, a bearing mounting seat 228 and a thrust ball bearing 227, the upper side of the rotating shaft 224 is fixedly connected with a probe mounting bracket 225, and the probe mounting bracket 225 is fixedly connected with a probe 226, the inner side of the rotating shaft 224 is fixedly connected with a linear rail slide 2213, and the inner side of the linear rail slide 2213 is fixedly connected with a measuring feed cylinder connector 223. A spring plunger mounting plate 2214 is connected, a spring plunger 2212 is fixedly connected to the upper side of the spring plunger mounting plate 2214, a displacement sensor 2210 is fixedly connected to the measuring sensor mounting bracket, the displacement sensor 2210 is in contact with the spring plunger mounting plate 2214, the clamping device 23 includes a clamping cylinder 231, a large base plate 232 is fixedly connected to the upper side of the clamping cylinder 231, a clamping cylinder mounting plate 233 and a product positioning flange 237 are fixedly connected to the upper side of the large base plate 232, a cylinder connector 234 is fixedly connected to the output end of the clamping cylinder 231, a pressure rod 235 is hinged on the upper side of the cylinder connector 234, and a pressure head 236 is fixedly connected to one end of the pressure rod 235;The differential assembly bearing measuring mechanism 3 includes three parts: a supporting device 31, an L2 measuring device 32 and a sliding device 33. The sliding device 33 includes a column 331. The column 331 is fixedly connected to a column cover plate 332 on the outside, and is fixedly connected to a lifting cylinder mounting plate 333 on the upper side. A lifting cylinder 334 is fixedly connected to the lifting cylinder mounting plate 333. The output end of the lifting cylinder 334 is fixedly connected to a cylinder floating joint 335. A wire rail 336 is fixedly connected to the front side of the column 331. A wire rail side top block 337 and a wire rail side top block 338 are fixedly connected to the wire rail 336. The linear rail slider 339 has a lifting slide 3310 fixedly connected to the outside of the linear rail slider 339, a tank drag chain 338 is provided on the right side of the lifting cylinder 334, and a hard limit mounting seat 3312 is provided below the tank drag chain 338, a hard limit shaft 3311 is fixedly connected to the outside of the hard limit mounting seat 3312, and a column 331 is fixedly connected to the inside of the hard limit mounting seat 3312, and the L2 measuring device 32 includes a lifting bracket 327, a protective cover 328 is fixedly connected to the outside of the lifting bracket 327, and the lifting slide 3310 is fixedly connected to the lifting bracket 327. The bottom of the inner part of the 27 is fixedly connected to an L2 linear bearing 324, the upper end of the L2 linear bearing 324 is fixedly connected to a floating guide shaft 325, a measuring sensor 326 is provided between the two L2 linear bearings 324, a floating spring 323 is provided below the lifting bracket 327, a measuring block 322 is fixedly connected to the lower end of the floating spring 323, a floating plate 321 is fixedly connected below the measuring block 322, the supporting device 31 includes a bottom plate 311, a lower positioning seat mounting plate 312 is fixedly connected to the upper side of the bottom plate 311, and a lower positioning seat mounting plate 312 is fixedly connected to the upper side of the lower positioning seat mounting plate 312. There is a lower positioning seat 313, a lower centering shaft 314 is fixedly connected in the middle of the lower positioning seat 313, a floating fixed shaft 319 is fixedly connected below the floating plate 321, a floating head 315 is floatingly connected below the floating fixed shaft 319, a large steel ball 316 is arranged between the floating fixed shaft 319 and the floating head 315, and springs 317 and small steel balls 318 are arranged on both sides of the floating head 315. Finally, the thickness of the gasket is calculated by L=L1-L2; and during the measurement process, the measuring head has a certain amount of floating to reduce the error caused by poor contact of the measured surface. ;

[0015] Working principle: When the shell-reducing bearing installation position measuring mechanism 2 is working, the shell-reducing small assembly 24 is manually placed on the product positioning flange 237 and positioned by the product positioning pin. The button is started with both hands, and the clamping cylinders 231 on the left and right sides work, driving the pressure head 236 on the pressure rod 235 to press the shell-reducing small assembly 24. The lifting cylinder 211 drives the sliding plate 215 and the parts installed thereon to move upward along the guide shaft 213 through the cylinder connector 214. Then the measuring feed cylinders 2215 on the left and right sides drive the L1 linear rail slider 222 to move to the left and right outside respectively through the measuring feed cylinder connector 234. Because the linear rail slide 2213 is installed on the L1 linear rail slider 222, the probe 226 installed on the linear rail slide 2213 is respectively pressed against the two semi-circular step surfaces of the shell reduction subassembly 24. The displacement sensor 2210 is installed on the measuring sensor mounting bracket and directly contacts the spring plunger mounting plate 2214. Because the spring plunger mounting plate 2214 is installed on the linear rail slide 2213, the bearing mounting seat 228 is installed on the linear rail slide 2213, the rotating shaft 224 and the thrust ball bearing 227 are installed on the linear rail slide 2213, and the probe mounting bracket 225 and the probe 226 are installed on the rotating shaft 224, so that the size distance L1 of the shell reduction subassembly 24 relative to the calibration part is measured by the probe 226.

[0016] When the differential assembly bearing measuring mechanism 3 is working, the differential assembly 34 is manually placed on the lower positioning seat 313, and the inner hole is positioned by the lower centering shaft 314. The button is started with both hands, and the lifting cylinder 334 works to drive the lifting slide plate 3310 to move downward through the cylinder floating joint 335 until it is limited by the hard limit shaft 3312. Because the floating head 315 is floatingly connected to the floating fixed shaft 319 through the large steel ball 316, the spring 317 and the small steel ball 318, and the floating fixed shaft 319 is installed on the floating plate 321, the floating plate 321 can float up and down along the L2 linear bearing 324 through the floating guide shaft 325 and the floating spring 323. When the floating head 315 contacts the differential assembly 34, it will overcome the floating spring 323 to move upward and compress the spring until it is limited by the hard limit shaft 3311. Then, the measuring block 322 installed on the floating plate 321 will have a height difference, and the measuring sensor 326 will measure the dimensional distance L2 of the differential assembly 34 relative to the calibration part.

[0017] Finally, the thickness of the gasket is calculated by L=L1-L2. In the measurement process, the measuring head has a certain amount of floating to reduce the error caused by poor contact of the measured surface.

[0018] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A novel differential bearing gasket measuring device, characterized in that: include: A frame (1), wherein a grid frame (4) is fixedly connected to the upper edge of the frame (1), a display (5) is fixedly connected to the right side of the grid frame (4), and a shell bearing installation position measuring mechanism (2) and a differential assembly bearing measuring mechanism (3) are fixedly connected to the upper side of the frame (1), wherein the shell bearing installation position measuring mechanism (2) comprises three parts: a jacking device (21), an L1 measuring device (22) and a clamping device (23), and the differential assembly bearing measuring mechanism (3) comprises three parts: a supporting device (31), an L2 measuring device (32) and a sliding device (33).

2. A novel differential bearing gasket measuring device according to claim 1, characterized in that: The lifting device (21) comprises a lifting cylinder (211), a lifting cylinder mounting plate (212) being fixedly connected to the upper side of the lifting cylinder (211), guide shafts (213) being fixedly connected to both ends of the lifting cylinder mounting plate (212), a sliding plate (215) being slidably connected to the upper end of the guide shaft (213), a linear bearing (216) and a measuring sensor mounting bracket being fixedly connected to the upper side of the sliding plate (215), a large base plate (232) being fixedly connected to the upper end of the linear bearing (216), an output end of the lifting cylinder (211) being fixedly connected to a cylinder connector (214), and the L1 measuring sensor mounting bracket being fixedly connected to the upper end of the linear bearing (216). The device (22) comprises an L1 linear rail (221), the lower side of the L1 linear rail (221) is fixedly connected to a lifting cylinder mounting plate (212), and the upper side is slidably connected to an L1 linear rail slider (222), the left and right sides of the L1 linear rail (221) are fixedly connected to a measuring feed cylinder mounting plate (2211), the measuring feed cylinder mounting plate (2211) is fixedly connected to a measuring feed cylinder (2215), the output end of the measuring feed cylinder (2215) is fixedly connected to a measuring feed cylinder connector (223), the measuring feed cylinder connector (223), the L1 linear rail slider (222) is fixedly connected to a measuring feed cylinder connector (223), and the measuring feed cylinder connector (223) is fixedly connected to a measuring feed cylinder connector (223). A rotating shaft (224), a bearing mounting seat (228) and a thrust ball bearing (227) are fixedly connected on the side of the rotating shaft (224); a probe mounting bracket (225) is fixedly connected on the upper side of the rotating shaft (224); a probe (226) is fixedly connected on the probe mounting bracket (225); a linear rail slide (2213) is fixedly connected on the inner side of the rotating shaft (224); a spring plunger mounting plate (2214) is fixedly connected on the inner side of the linear rail slide (2213); a spring plunger (2212) is fixedly connected on the upper side of the spring plunger mounting plate (2214); a displacement sensor is fixedly connected on the measuring sensor mounting bracket. The displacement sensor (2210) is in contact with a spring plunger mounting plate (2214); the clamping device (23) comprises a clamping cylinder (231); the upper side of the clamping cylinder (231) is fixedly connected to a large base plate (232); the upper side of the large base plate (232) is fixedly connected to a clamping cylinder mounting plate (233) and a product positioning flange (237); the output end of the clamping cylinder (231) is fixedly connected to a cylinder connector (234); the upper side of the cylinder connector (234) is hinged with a pressure rod (235); one end of the pressure rod (235) is fixedly connected to a pressure head (236).

3. A novel differential bearing gasket measuring device according to claim 2, characterized in that: The sliding device (33) comprises a column (331), the outer side of the column (331) is fixedly connected to a column cover plate (332), and the upper side is fixedly connected to a lifting cylinder mounting plate (333), the lifting cylinder mounting plate (333) is fixedly connected to a lifting cylinder (334), the output end of the lifting cylinder (334) is fixedly connected to a cylinder floating joint (335), the front side of the column (331) is fixedly connected to an L2 linear rail (336), the L2 linear rail (336) is fixedly connected to a linear rail side top block (337) and an L2 linear rail slider (339), the L2 linear rail The slider (339) is fixedly connected to a lifting slide plate (3310) on the outside, a tank drag chain (338) is provided on the right side of the lifting cylinder (334), a hard limit mounting seat (3312) is provided below the tank drag chain (338), a hard limit shaft (3311) is fixedly connected to the outside of the hard limit mounting seat (3312), and a column (331) is fixedly connected to the inside of the hard limit mounting seat (3312), the L2 measuring device (32) comprises a lifting bracket (327), a protective cover (328) is fixedly connected to the outside of the lifting bracket (327), and a lifting slide plate (3310) is fixedly connected to the outside of the lifting bracket (327). A bracket (327), wherein a linear bearing (324) is fixedly connected to the bottom of the lifting bracket (327), a floating guide shaft (325) is fixedly connected to the upper end of the linear bearing (324), a measuring sensor (326) is provided between the two linear bearings (324), a floating spring (323) is provided below the lifting bracket (327), a measuring block (322) is fixedly connected to the lower end of the floating spring (323), a floating plate (321) is fixedly connected below the measuring block (322), and the supporting device (31) comprises a bottom plate (311), and the bottom plate (311) A lower positioning seat mounting plate (312) is fixedly connected to the upper side, a lower positioning seat (313) is fixedly connected to the upper side of the lower positioning seat mounting plate (312), a lower centering shaft (314) is fixedly connected in the middle of the lower positioning seat (313), a floating fixed shaft (319) is fixedly connected below the floating plate (321), a floating head (315) is floatingly connected below the floating fixed shaft (319), a large steel ball (316) is provided between the floating fixed shaft (319) and the floating head (315), and springs (317) and small steel balls (318) are provided on both sides of the floating head (315).

4. A novel differential bearing gasket measuring device according to claim 3, characterized in that: An adjustment block (329) is provided on the lower positioning seat mounting plate (311).

5. A novel differential bearing gasket measuring device according to claim 4, characterized in that: A measuring port adapted to the shell reduction small assembly (24) is provided in the middle of the large bottom plate (232).

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