CN216049633U

CN216049633U - Detection tool for measuring symmetry degree of cylinder bearing block

Info

Publication number: CN216049633U
Application number: CN202121398286.5U
Authority: CN
Inventors: 薛飞; 祁昕; 陶涌杰; 王康辉
Original assignee: SAIC Volkswagen Automotive Co Ltd
Current assignee: SAIC Volkswagen Automotive Co Ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2022-03-15
Anticipated expiration: 2031-06-23

Abstract

The utility model discloses a checking fixture for measuring the symmetry of a cylinder bearing block, which comprises: the measuring base is provided with a measuring front end and a supporting rear end at two ends in the length direction respectively, and the supporting rear end is provided with two supporting end surfaces which are coplanar with each other; the dial indicator is arranged on the measuring base, the axial direction of the dial indicator is perpendicular to the measuring front end, the dial indicator is provided with a measuring rod, and the front end of the measuring rod extends towards the measuring front end; the dial indicator pull rod is connected with the rear end of the measuring rod; the two marble components are arranged in the measuring base and correspond to the two supporting end surfaces, each marble component comprises marbles, and the marbles are arranged to move along the length direction of the measuring base so as to respectively extend out of or retract back from the two supporting end surfaces; the marble telescopic component is connected with the marble; and the two ends of the main lever, which are positioned at the two sides of the articulated shaft, are respectively connected with the dial indicator pull rod and the marble telescopic component.

Description

Detection tool for measuring symmetry degree of cylinder bearing block

Technical Field

The utility model relates to a detection tool, in particular to a symmetry degree measurement detection tool.

Background

As is known, the crankshaft bearing seat of the cylinder block is used for assembling the crankshaft and the bearing seat of the engine, the size of the crankshaft bearing seat is one of important machining sizes in the engine, and the machining precision determines the transmission condition of the crankshaft in the bearing seat.

When the cylinder crankshaft bearing seat is machined, the cylinder crankshaft bearing seat can be divided into two sections with the width 115 and the width 108, and besides two length tolerances of the width 115(0/-0.05) and the width 108(0/-0.05), the cylinder crankshaft bearing seat also has a form and position tolerance requirement that the 115(0/-0.05) section has the symmetry degree of 0.1 based on the 108(0/-0.05) section.

Usually, the cylinder bearing seat is machined on a cylinder three-line AF200 special machine, the process route is generally 'rough milling-broaching', and the width dimension of the bearing seat is ensured by a broach. The broach can adopt the core expanding mechanism that slide wedge and bolt mechanism constitute to realize the independent adjustment of four faces, and its 115(0/-0.05) width dimension and 108(0/-0.05) width dimension all can realize measuring through interior micrometer, but the size of cylinder block bearing frame symmetry does not have the on-the-spot gauge to measure, and it has great quality risk.

In order to solve the above problems in the prior art, some researchers have performed related optimization designs, and have obtained the following improvements:

1. and measuring the cylinder bearing block by using a three-coordinate measuring machine.

2. And the indirect measurement is carried out by using tools such as a bench worker platform, a height gauge, a lever dial indicator, a mandrel, an adjustable jack and the like.

3. And manufacturing a molding standard block to be matched with a feeler gauge or a needle gauge for measurement.

However, it should be noted that, the three improved schemes still have certain defects, when the scheme 1 is adopted and a three-coordinate measuring instrument is used for measurement, although the measurement precision is high and the flexibility is strong, the equipment investment cost is high, the measurement period is long, and the environment with multiple vibrations and oil dirt and dust on the production site is not suitable for the use of the three-coordinate measuring instrument. When adopting above-mentioned scheme 2, it is very high to operator's skill requirement, complex operation, and the measurement cycle is long, and can receive measuring tool's precision and measuring mode's restriction, and measurement cumulative error is great. When the scheme 3 is adopted, the problems of complex operation, long measurement period and low measurement precision also exist.

Therefore, in order to solve the problems in the prior art, the utility model provides a gauge for measuring the symmetry of a cylinder bearing seat, which adopts an optimized structural design and can quickly and reliably measure the symmetry error of the cylinder bearing seat accurately in a production field. The gauge is simple in structure, convenient to maintain, good in reliability and wide in applicability, can be used on all occasions for measuring the symmetry of the cylinder bearing block, and has very good popularization prospect and application value.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a detection tool for measuring the symmetry degree of a cylinder body bearing seat, which adopts an optimized structural design and can quickly and reliably accurately measure the symmetry degree error of the cylinder body bearing seat in a production field. The gauge is simple in structure, convenient to maintain, good in reliability and wide in applicability, can be used on all occasions for measuring the symmetry of the cylinder bearing block, and has very good popularization prospect and application value.

In order to achieve the above object, the present invention provides a testing fixture for measuring symmetry of a cylinder bearing block, comprising:

the measuring base is provided with a measuring front end and a supporting rear end at two ends in the length direction respectively, wherein the supporting rear end is provided with two supporting end surfaces which are arranged in a coplanar manner;

the dial indicator is arranged on the measuring base, the axial direction of the dial indicator is perpendicular to the measuring front end, the dial indicator is provided with a measuring rod, and the front end of the measuring rod extends towards the measuring front end;

the dial indicator pull rod is connected with the rear end of the measuring rod;

two ball assemblies arranged in the measuring base and corresponding to the two supporting end surfaces, wherein each ball assembly comprises a ball which is arranged to move along the length direction of the measuring base so as to extend out of or retract into the two supporting end surfaces respectively;

the pin tumbler telescopic component is connected with the pin tumbler;

the main lever is connected with the measuring base through a hinged shaft, and two ends of the main lever, which are positioned on two sides of the hinged shaft, are respectively connected with a dial indicator pull rod and a marble telescopic component;

when the main lever rotates around the hinge shaft in the first direction, the dial indicator pull rod is driven to pull the measuring rod to linearly move towards the direction departing from the measuring front end, and meanwhile, the marble stretching assembly drives the marbles to retract; when the main lever rotates around the hinge shaft in a second direction opposite to the first direction, the dial indicator pull rod is driven to pull the measuring rod to move towards the direction of the measuring front end, and meanwhile, the marble telescopic component drives the marbles to extend out.

When the gauge for measuring the symmetry of the cylinder body bearing block is used for measuring the symmetry of the cylinder body bearing block, an operator can firstly lightly put a measuring base of the gauge into positions of two gear bearing blocks of a cylinder body, so that a measuring rod of a dial indicator is aligned with the width section of the cylinder body bearing block to be measured. Then, an operator can remove the applied external force, the marbles in the marble component extend out of the two supporting end faces, and the dial indicator pull rod pulls the measuring rod to move towards the direction of the measuring front end. At the moment, an operator can read the difference value of the two side convex table surfaces of the bearing seat through the dial indicator.

Then, according to the same operation, the checking fixture is turned by 180 degrees, and the difference value of the two side convex table surfaces of the bearing seat on the other side is measured. After the detection is finished, an operator can obtain a symmetry error through calculation so as to judge the quality of the workpiece; in addition, an operator can adjust the tensioning screw on the broach according to the obtained difference value, so as to adjust the symmetry degree of the cylinder bearing block.

Further, in the gauge for measuring the symmetry degree of the cylinder block bearing block, a groove is formed in the bottom surface of the measuring base.

In the technical scheme of the utility model, the bottom surface of the measuring base can be further provided with two grooves, so that the contact between the bottom surface of the measuring base and the bottom surface of the cylinder bearing seat to be measured can be reduced, and the measuring precision is improved.

Further, in the checking fixture for measuring the symmetry degree of the cylinder block bearing block, the measuring base is H-shaped.

Further, in the gauge for measuring the symmetry of the cylinder block bearing block, the end part of the dial indicator pull rod connected with the measuring rod is provided with a U-shaped opening.

Further, in the checking fixture for measuring symmetry of a bearing seat of a cylinder block, one end of the main lever is connected with a lever handle piece, and the lever handle piece is used for applying external force to enable the main lever to rotate around the hinge shaft in the first direction.

In the above technical solution of the present invention, in order to facilitate the operator to apply the external force, a lever handle member may be further disposed at one end of the main lever, and the operator may grip the handle member to apply the external force, so that the main lever of the present invention rotates around the hinge shaft in the first direction.

Further, in the checking fixture for measuring symmetry of a cylinder block bearing seat, a spring piece is arranged between the main lever and the measuring base, and exerts elastic force on the main lever, so that when the external force is removed, the main lever rotates around the hinge shaft in a second direction opposite to the first direction.

Further, in the checking fixture for measuring symmetry of a cylinder block bearing seat, each of the spring assemblies further includes:

the thread sleeve is arranged in the measuring base, and the bullet sleeve is arranged in the thread sleeve;

and the spring is arranged between the marble and the end surface of the inner hole of the measuring base so as to apply axial force to the marble.

Further, in the gauge for measuring the symmetry degree of the cylinder block bearing seat, the outer wall of the marble is provided with a boss which extends outwards in the radial direction and is arranged in a groove formed in the inner wall of the threaded sleeve.

Further, in the checking fixture for measuring the symmetry of the cylinder body bearing block, a holding handle support is further arranged on the measuring base, and a holding handle is arranged on the holding handle support.

In the technical scheme of the utility model, the measuring base can be further fixedly provided with a holding handle support, the holding handle support can be fixedly connected with the measuring base in a bolt connection mode, the holding handle support can also be provided with a holding handle, and an operator can simply and laborsavingly hold the checking fixture by arranging the holding handle, so that the checking fixture is convenient for the operator to use.

Further, in the checking fixture for measuring symmetry of a cylinder block bearing seat, the pin spring extension assembly comprises:

two deflector rods which are respectively correspondingly connected with the marbles;

two marble pull rods which are correspondingly connected with the shift levers through waist holes arranged at the head ends of the two marble pull rods;

and two ends of the connecting rod in the axial direction are respectively hinged with the tail ends of the two marble pull rods, and the connecting rod is also hinged with the main lever.

Compared with the prior art, the gauge for measuring the symmetry degree of the cylinder block bearing seat has the following advantages and beneficial effects:

the detection tool for measuring the symmetry of the cylinder body bearing seat can quickly and reliably measure the symmetry error of the cylinder body bearing seat in a production field accurately through reasonable structural design. The gauge is simple in structure, convenient to maintain, good in reliability and wide in applicability, can be used on all occasions for measuring the symmetry of the cylinder bearing block, and has very good popularization prospect and application value.

In the utility model, the knife dismantling tool is skillfully designed and utilizes a dial indicator pull rod, a marble telescopic component, a main lever and a marble component. The mutual matching of the components can greatly simplify the operation and use of operators, and when the operators pull the main lever to rotate around the hinge shaft in the first direction, the effect that the measuring rod of the pin tumbler and the dial indicator contract simultaneously can be achieved.

When the detection tool for measuring the symmetry degree of the cylinder body bearing seat is used for detection, the symmetry degree of the cylinder body bearing seat can be effectively measured by using a measurement principle of converting a symmetry degree error into a difference value of an upper convex table surface and a lower convex table surface of the cylinder body bearing seat, and the detection tool has high measurement precision, wide applicability and great popularization value.

Drawings

Fig. 1 is a schematic structural view of a checking fixture for measuring symmetry of a cylinder block bearing seat according to an embodiment of the utility model at a viewing angle.

Fig. 2 is a schematic structural view of the checking fixture for measuring symmetry of a cylinder block bearing seat according to the present invention from another view angle in an embodiment.

Fig. 3 is a schematic structural view of a dial indicator pull rod of the gauge for measuring the symmetry of the cylinder block bearing seat in one embodiment of the utility model.

Fig. 4 is a partial structural analysis view of the checking fixture for measuring symmetry of a cylinder block bearing seat according to an embodiment of the present invention at a viewing angle.

Fig. 5 is a partial enlarged view of the structure shown in fig. 4 at a.

FIG. 6 is a top view of the checking fixture for measuring symmetry of a cylinder block bearing seat according to an embodiment of the utility model.

Fig. 7 schematically shows a B-B cross-sectional view of the structure shown in fig. 6.

FIG. 8 is a structural front view of the checking fixture for measuring symmetry of a cylinder block bearing seat in one embodiment of the utility model.

Fig. 9 is a cross-sectional view of the structure of fig. 8 taken along line C-C.

Fig. 10 schematically shows a structural schematic diagram of a main lever matched with a measuring base, a dial indicator pull rod and a pin tumbler telescopic assembly in one embodiment of the checking fixture for measuring symmetry of a cylinder block bearing seat.

Fig. 11 schematically shows a C-C cross section when an operator applies an external force.

FIG. 12 shows a schematic diagram of detection of one side of a cylinder block bearing seat by using the detection tool for measuring the symmetry of the cylinder block bearing seat.

Fig. 13 shows a schematic diagram of the detection tool for measuring the symmetry of the cylinder block bearing seat, which is disclosed by the utility model, for detecting the other side of the cylinder block bearing seat.

Fig. 14 schematically shows a structural view of a cylinder block bearing housing.

Fig. 15 is an enlarged partial view of the cylinder block bearing housing shown in fig. 14 at D.

Fig. 16 is an enlarged view of a portion of the cylinder block bearing housing shown in fig. 14 at E.

Detailed Description

The checking fixture for measuring the symmetry of the cylinder block bearing seat according to the present invention will be further explained and illustrated with reference to the drawings and the specific embodiments of the specification, however, the explanation and the illustration do not unduly limit the technical solution of the present invention.

As shown in fig. 1 and fig. 2, in the present embodiment, the gauge for measuring symmetry of a cylinder block bearing seat according to the present invention may include: the measuring base 1, the dial indicator 2 and the dial indicator pull rod 3. Wherein, the two ends of the measuring base 1 in the length direction are respectively a measuring front end 11 and a supporting rear end 12, and the supporting rear end 12 has two supporting end surfaces 121 (as shown in fig. 4) disposed coplanar with each other.

In the present embodiment, the dial indicator 2 is correspondingly provided on the measurement base 1, the axial direction of the dial indicator 2 is perpendicular to the measurement front end 11, the measurement rod 21 is provided on the dial indicator 2, and the front end of the measurement rod 21 may extend toward the measurement front end 11.

In addition, as further shown in fig. 2, in the present embodiment, the bottom surface of the measuring base 1 is provided with a groove 13, and the measuring base is H-shaped. When the checking fixture is used for measuring, two supporting legs which support the rear end 12 in the measuring base 1 can be just attached to the horizontal plane of a cylinder body bearing seat. Moreover, the bottom surface of the measuring base 1 is provided with two grooves 13, so that the contact with the bottom surface of the cylinder bearing seat to be measured can be reduced, and the measuring precision is improved.

In addition, in the embodiment, the measurement base 1 of the present invention may further be fixedly provided with a holding handle bracket 14, the holding handle bracket 14 may be fixedly connected to the measurement base 1 by means of a bolt connection, the holding handle bracket 14 may further be provided with a holding handle 15, the holding handle 15 may be connected to the holding handle bracket 14 by interference fit between the shaft holes, and the holding handle 15 may be provided to enable an operator to simply and laborsavingly hold the inspection device of the present invention, so as to facilitate the use of the operator.

As shown in fig. 3 and also shown in fig. 1, in the present embodiment, the dial indicator draw bar 3 may be connected to the rear end of the measuring rod 21, and the end connected to the measuring rod 21 has a U-shaped opening 31.

It should be noted that the width of the diameter of the U-shaped opening 31 needs to be larger than the width of the diameter of the rear end of the measuring rod 21, and the width of the U-shaped opening may be smaller than the width of the outer diameter of the washer 32 (shown in fig. 4), so that the dial indicator pull rod 3 can slightly rotate around the U-shaped opening 31 when the measuring rod 21 is pulled. Wherein, the gasket 32 can be sleeved outside the measuring rod 21 of the dial indicator 2.

As can be seen from fig. 3, in this embodiment, in order to avoid the dial indicator 2, the middle section of the dial indicator pull rod 3 is also provided with a certain circular structure, and the radius of the circular structure of the dial indicator pull rod 3 needs to be larger than the radius of the outer circular shell of the dial indicator 2.

As shown in fig. 4 and also shown in fig. 1, in the present embodiment, in addition to the measuring base 1, the dial indicator 2 and the dial indicator pull rod 3, the measuring tool according to the present invention may further include: two ball assemblies 4, a ball retraction assembly 5 and a main lever 6.

As can be seen from fig. 4, in the present embodiment, two elastic assemblies 4 are respectively disposed in the measuring base 1 and are disposed corresponding to two supporting end surfaces 121 supporting the rear end 12. Wherein each of the pin assemblies 4 includes a pin 41, and the pin 41 is configured to be movable along the length direction of the measuring base 1 to extend from or retract to the two supporting end surfaces 121, respectively.

Accordingly, with further reference to fig. 4, and with combined reference to fig. 1 and 2, in the present invention, a pin retraction assembly 5 connected to a pin 41 is also provided, and the pin retraction assembly 5 may include: two shift levers 51, two pin rods 52 and a connecting rod 53. Wherein, the two ends of the connecting rod 53 in the axial direction are respectively hinged with the tail ends of the two marble pull rods 52, and the connecting rod 53 is also hinged with the main lever 6; the two pin pull rods 52 can be correspondingly connected with the shift levers 51 through a waist hole 521 (shown in fig. 1) arranged at the head ends of the two pin pull rods, and the two shift levers 51 are correspondingly connected with the pins 41 respectively.

Fig. 5 is a partial enlarged view of the structure shown in fig. 4 at a.

In order to clearly and clearly show the spring assembly 4 disposed in the measuring base 1, the measuring base 1 is partially broken away in the top view shown in fig. 6.

As shown in fig. 5 and 6, in the present embodiment, each of the ball assemblies 4 includes, in addition to the balls 41: a threaded sleeve 42 and a spring 43. The threaded sleeve 42 can be arranged in the measuring base 1, and the marbles 41 in the marble component 4 can be correspondingly sleeved in the threaded sleeve 42 through clearance fit; the spring 43 can be sleeved between the marble 41 and the inner hole end surface of the measuring base 1.

It should be noted that, in the present invention, the pin 41 in the pin assembly 4, the thread bushing 42, and the shift lever 51 in the pin retraction assembly 5 may form an overall assembly. One end of the spring 43 abuts against the end face of the inner hole of the measuring base 1, and the other end of the spring 43 can apply an axial force to the pin 41 connected with the lever 51 based on the lever 51, and the pin 41 can move along the length direction of the measuring base 1 by using the elastic deformation generated by the spring 43 to extend out of or retract into the two supporting end faces 121 respectively.

In addition, in order to further explain the matching form of the threaded sleeve 42 and the pin 41, the combined structure of the threaded sleeve 42 and the pin 41 can be analyzed, as shown in fig. 7.

As shown in fig. 7, in the present invention, in order to ensure that the pin 41 does not rotate around the axial line of the threaded sleeve 42 when the pin 41 moves along the length direction of the measuring base 1, a boss X extending radially outward may be further provided on the outer wall of the cylinder of the pin 41, and when the pin 41 is sleeved in the threaded sleeve 42, the boss X may be correspondingly provided in a rectangular groove provided on the inner wall of the threaded sleeve 42.

It should be noted that in the present invention, the pin 41 can move along the rectangular groove in the screw housing 42, but cannot rotate around the axis of the screw housing 42.

In order to clearly show the structure of the main lever 6 matched with the measuring base 1, the dial indicator pull rod 3 and the pin tumbler telescoping assembly 5, the structures of the holding handle bracket 14 and the holding handle 15 are hidden in the figure 10 for illustration.

As shown in fig. 8, 9 and 10, and also as can be seen from fig. 2, in the present embodiment, the main lever 6 according to the present invention can be hinged to the measuring base 1 through a hinge shaft 62, and both ends of the main lever 6 on both sides of the hinge shaft 62 can be respectively connected to the dial indicator pull rod 3 and the connecting rod 53.

It should be noted that, in the present embodiment, a lever handle member 61 may be further connected to one end of the main lever 6 according to the present invention, the main lever 6 may be connected to the handle member 61 through a clearance fit between the shaft holes, and the handle member 61 may be used to apply an external force so that the main lever 6 can rotate in the first direction around the hinge shaft 62.

Accordingly, as can be seen by further referring to fig. 6 and 7, in the present embodiment, a spring plate 63 is provided between the main lever 6 and the measuring base 1, one end of the spring plate 63 is fixed to the beam of the measuring base 1, and the other end thereof is supported at the lower end of the main lever 6. The spring plate 63 can be used as a power source for restoring the original position of the checking fixture, and the spring plate 63 can apply elastic force to the main lever 6 so that the main lever 6 can rotate around the hinge shaft 62 in a second direction opposite to the first direction when the external force is removed.

In the gauge for measuring the symmetry of the cylinder bearing block, when an operator applies external force to the handle piece 61, the main lever 6 can be driven to rotate around the hinge shaft 62 in a first direction, in a C-C sectional view shown in FIG. 11, the first direction can be anticlockwise, and the main lever 6 can rotate around the hinge shaft 62 anticlockwise. At this time, the main lever 6 can drive the dial indicator pull rod 3 connected with the main lever to pull the measuring rod 21 to linearly move towards the direction away from the measuring front end 11, meanwhile, the main lever 6 can drive the connecting rod 53 in the pin tumbler telescoping assembly 5 to compress the spring piece 63 arranged between the main lever 6 and the measuring base 1, the connecting rod 53 can pull the two pin tumbler pull rods 52 hinged with the connecting rod 53, and the two pin tumbler pull rods 52 can drive the two shift rods 51 to move towards the spring 43 so as to compress the spring 43 and drive the pin tumblers 41 to retract.

When the operator releases the external force, the spring piece 63 applies an elastic force to the main lever 6, and the spring 43 applies an axial elastic force to extend the pin 41. At this time, the main lever 6 rotates about the hinge shaft 62 in a second direction opposite to the first direction, that is, the main lever 6 can rotate clockwise about the hinge shaft 62 in a C-C sectional view shown in fig. 11. When the main lever 6 rotates around the hinge shaft 62 in a second direction opposite to the first direction, the main lever 6 can drive the dial indicator pull rod 3 to pull the measuring rod 21 to move towards the measuring front end 11, so as to reset; and the pins 41 in the pin retraction assembly 5 are extended outwards under the action of the axial spring force of the cathedral 43.

In order to further explain the process of measuring the symmetry degree of the cylinder bearing seat by using the gauge for measuring the symmetry degree of the cylinder bearing seat. The present invention is specifically illustrated using the following figures 12-16.

As shown in fig. 12, 13, 14, 15 and 16, during the present detection, the operator can pull the handle member 61 to linearly move the measuring rod 21 in a direction away from the measuring front end 11, and simultaneously retract the pin 41; at the moment, an operator can place the checking fixture in the cylinder body bearing seat through the holding handle 15, the measuring base 1 of the checking fixture is installed in the cylinder body bearing seat, the operator releases the applied force, the measuring rod 21 and the marble 41 can reset under the action of the spring piece 63, and the difference F between the cross section 108 and the cross section boss 115 on the same side in the cylinder body bearing seat in the direction perpendicular to the boss can be accurately measured through the dial indicator 2.

Correspondingly, the gauge for measuring the symmetry of the cylinder block bearing seat can be turned by 180 degrees to measure the difference G between bosses with the 08 sections and the 115 sections in the direction perpendicular to the bosses by adopting the same operation.

Correspondingly, after the difference F and the difference G are obtained through detection, the symmetry error can be obtained through calculation, and then the quality of the workpiece is judged. An operator can further adjust the tensioning screw on the broach according to the F, G difference value, so as to adjust the symmetry degree of the cylinder bearing block.

In conclusion, the detection tool for measuring the symmetry degree of the cylinder body bearing seat can quickly and reliably measure the symmetry degree error of the cylinder body bearing seat on a production site accurately through reasonable structural design. The gauge is simple in structure, convenient to maintain, good in reliability and wide in applicability, can be used on all occasions for measuring the symmetry of the cylinder bearing block, and has very good popularization prospect and application value.

It should be noted that the prior art in the protection scope of the present invention is not limited to the examples given in the present application, and all the prior art which is not inconsistent with the technical scheme of the present invention, including but not limited to the prior patent documents, the prior publications and the like, can be included in the protection scope of the present invention.

In addition, the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradictory to each other.

It should also be noted that the above-mentioned embodiments are only specific embodiments of the present invention. It is apparent that the present invention is not limited to the above embodiments and similar changes or modifications can be easily made by those skilled in the art from the disclosure of the present invention and shall fall within the scope of the present invention.

Claims

1. A examine utensil that is used for cylinder bearing frame symmetry to measure which characterized in that includes:

the pin tumbler telescopic component is connected with the pin tumbler;

2. The gauge for measuring the symmetry of the cylinder block bearing block according to claim 1, wherein the bottom surface of the measuring base is provided with a groove.

3. The gauge for measuring the symmetry of the cylinder block bearing block according to claim 1, wherein the measuring base is H-shaped.

4. The gauge for measuring the symmetry of the cylinder block bearing block according to claim 1, wherein the end of the dial indicator draw bar connected with the measuring rod is provided with a U-shaped opening.

5. The gauge for measuring the symmetry of a cylinder block bearing housing of claim 1, wherein a lever handle member is connected to one end of the main lever, said handle member being configured to apply an external force to rotate the main lever in a first direction about the hinge axis.

6. The gauge for measuring the symmetry of a cylinder block bearing housing according to claim 1, wherein a spring plate is provided between the main lever and the measuring base, the spring plate applying a spring force to the main lever such that the main lever rotates about the hinge shaft in a second direction opposite to the first direction when the external force is removed.

7. The gauge for measuring symmetry of a cylinder block bearing housing of claim 1, wherein each of the spring assemblies further comprises:

8. The gauge for measuring the symmetry of the cylinder bearing block according to claim 7, wherein the outer wall of the pin has a radially outwardly extending projection that fits within a groove formed in the inner wall of the threaded sleeve.

9. The gauge for measuring the symmetry of the cylinder block bearing block according to claim 1, wherein a holding handle bracket is further provided on the measuring base, and a holding handle is provided on the holding handle bracket.

10. The gauge for measuring symmetry of a cylinder block bearing housing as claimed in any one of claims 1-9, wherein the pin extension assembly comprises: