CN211262083U - Utensil is examined to two depths of falling of synchronous ware tooth cover - Google Patents
Utensil is examined to two depths of falling of synchronous ware tooth cover Download PDFInfo
- Publication number
- CN211262083U CN211262083U CN201922019291.XU CN201922019291U CN211262083U CN 211262083 U CN211262083 U CN 211262083U CN 201922019291 U CN201922019291 U CN 201922019291U CN 211262083 U CN211262083 U CN 211262083U
- Authority
- CN
- China
- Prior art keywords
- pair
- detection
- measuring
- plate
- end surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The utility model discloses a synchronizer gear sleeve secondary depth gauge, which comprises a mandrel, wherein the mandrel is sequentially divided into an integrated lower section, a flange plate, a middle section and an upper section which are coaxially arranged from bottom to top; the lower section is coaxially sleeved with a detection seat; the detection seat is coaxially sleeved with a lower measurement plate; the middle section is sleeved with an adjusting nut which can move up and down in the middle section, the upper section is sleeved with a measuring head, and the adjusting nut is used for adjusting the height of the measuring head; the measuring head is characterized in that an upper measuring plate is arranged on the top surface of an arm plate of the measuring head, a dial indicator is installed on the upper measuring plate, and the dial indicator is used for measuring the height of a detection surface and the height difference of the top end surface of a synchronizer gear sleeve to be detected. The utility model discloses an examine the cooperation that passes through the measuring head, can turn into face and face distance with this degree of depth, measure through the percentage table, ingenious conversion measuring method for measure great simplification and reduced the measurement degree of difficulty. The measurement accuracy is improved.
Description
Technical Field
The utility model belongs to the detection apparatus field relates to synchronous ware tooth cover class part, concretely relates to utensil is examined to two depth of falling of synchronous ware tooth cover.
Background
For the gear sleeve part with the synchronizer provided with the secondary chamfer, the depth size of the secondary chamfer cannot be detected, and in the prior art, all parts with the structure of the main box synchronizer are measured by adopting the synchronizer meshing gear ring matched with the parts. The previous measurement methods were: during measurement, firstly, the matched hot finished gear ring is matched with the gear ring, and then, the height difference between the end surface of the gear ring and the end surface of the sliding sleeve is measured, and if the height difference is within the range of +/-0.1, the depth is qualified. Otherwise, this depth is not qualified. This approach does not really measure the dimension, and only meets the assembly requirements. And the case fitting ring gear is manufactured with errors. This dimension is poorly manufactured.
Disclosure of Invention
Not enough to prior art exists, the utility model aims to provide a utensil is examined to two degree of depth of falling of synchronizer gear sleeve, solve the not high technical problem of measurement accuracy of two degree of depth of falling of synchronizer gear sleeve among the prior art.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
a synchronizer gear sleeve secondary depth gauge comprises a mandrel, wherein the mandrel is sequentially divided into a lower section, a flange plate, a middle section and an upper section which are coaxially arranged integrally from bottom to top;
the lower section is coaxially sleeved with a detection seat which is detachably fixed on the flange plate;
the detection seat is coaxially sleeved with a lower measuring plate, the lower measuring plate is of a hollow structure, a support ring is arranged on the hollow inner wall of the lower measuring plate, the support ring divides the lower measuring plate into an upper mounting cavity and a lower sleeving cavity, the mounting cavity is used for mounting a synchronizer gear sleeve to be detected, and the sleeving cavity is sleeved at the top of the detection seat;
the middle section is sleeved with an adjusting nut which can move up and down in the middle section, the upper section is sleeved with a measuring head, and the adjusting nut is used for adjusting the height of the measuring head;
the measuring head comprises a sleeving cylinder sleeved on the upper section, an arm plate is arranged on the sleeving cylinder along the radial direction, and a detection tooth head matched with a two-falling part of a synchronizer tooth sleeve to be detected is arranged on the outer end face of the arm plate; the bottom end surface of the sleeving cylinder, the bottom end surface of the arm plate and the bottom end surface of the detection gear head are on the same plane; the height of the detection tooth head is smaller than that of the arm plate, and the height of the arm plate is smaller than that of the sleeving barrel; the top surface of the detection tooth head is a detection surface;
the top surface of arm board on be provided with the last measuring board that can move on the top surface of arm board, processing has the percentage table mounting hole with dabber parallel arrangement on the last measuring board, installs the percentage table on the percentage table mounting hole, the percentage table is used for measuring the height of detection face and the difference in height of the top face of the synchronous ware tooth cover of waiting to examine.
The utility model discloses still have following technical characteristic:
the detection tooth head is of a plane-symmetric structure and comprises a top surface, a bottom surface and a pair of parallel side surfaces and end surfaces, wherein the top surface and the bottom surface are parallel, and the pair of side surfaces and the end surfaces are mutually vertical in pairs; the top surface is connected with the pair of side surfaces through a side edge respectively, the top surface is connected with the end surface through a side edge, and the pair of side surfaces is connected with the end surface through a side edge respectively;
the bottom surface is an isosceles triangle plane, and the end surface is an axisymmetric pentagonal plane consisting of a rectangle and a triangle; the bottom surface is connected with the pair of side surfaces through a pair of symmetrically arranged double-inclined planes with the same structure, and the double-inclined planes are pentagonal planes; the intersected edge of the pair of the two reverse inclined planes is connected with the vertex angle of the bottom surface and the base angle of the end surface, and the intersected edge of the pair of the two reverse inclined planes is positioned on the symmetrical surface of the detection tooth head;
two edge edges of the pair of two inverted slopes, which are respectively intersected with the bottom surface, are two isosceles oblique edges of the bottom surface, the two edge edges of the pair of two inverted slopes, which are respectively intersected with the pair of side surfaces, are perpendicular to the end surface, and a first included angle is formed between the two edge edges of the pair of two inverted slopes, which are respectively intersected with the end surface; a second included angle is formed between the edge and the bottom surface, which are intersected by the two reverse inclined surfaces.
The size of the first included angle is 100 degrees +/-30'; the size of the second included angle is 8 +/-20'; the projection distance of the edge intersected by the pair of the two inverted inclined planes on the bottom surface is equal to 0.33 +/-0.01 time of the height of the isosceles triangle plane of the bottom surface.
The detection seat and the flange plate are fixedly connected through screws.
The middle section is connected with an adjusting nut through a threaded connecting sleeve.
The inner diameter of the installation cavity is equal to the outer diameter of a synchronizer gear sleeve to be detected, and the inner diameter of the sleeving cavity is equal to the outer diameter of the top of the detection seat.
And a fastening bolt for locking the dial indicator is arranged on the dial indicator mounting hole, and the end part of the fastening bolt is in contact with the bushing sleeved on the dial indicator.
Compared with the prior art, the utility model, following technological effect has:
(I) the utility model discloses an examine the cooperation of passing through the measuring head, can turn into face and face distance with this degree of depth, measure through the percentage table, ingenious conversion measuring method for measure great simplification and reduced the measurement degree of difficulty. Improve the measurement precision
(II) the utility model discloses an examine utensil and verify through the field usage, measuring effect is good, and measurement process is stable. Through repeated measurement for dozens of times, the measurement results are all 1 value, the variation is less than or equal to 0.01, the measurement precision is high,
(III) the utility model discloses an examine a commonality strong, every set of utensil of examining only two parts are the parts that do not share, and all tooth cover sharings of taking this type of other parts.
Drawings
Fig. 1 is a schematic front sectional structure view of the inspection device of the present invention.
Fig. 2 is a front view of the mandrel.
Fig. 3 is a schematic top view of the mandrel.
Fig. 4 is a front sectional structural view of the test socket.
Fig. 5 is a schematic bottom view of the test seat.
Fig. 6 is a front sectional structural view of the lower measurement plate.
Fig. 7 is a schematic bottom view of the lower measurement plate.
Fig. 8 is a perspective view of a measuring head.
Fig. 9 is a schematic perspective view of the detection tooth head.
Fig. 10 is a front cross-sectional structural schematic view of a measuring head.
Fig. 11 is a schematic top view of a measuring head.
Fig. 12 is a schematic view of the usage state of the testing fixture of the present invention.
The meaning of the individual reference symbols in the figures is: 1-mandrel, 2-detection seat, 3-lower measurement plate, 4-measurement head, 5-upper measurement plate, 6-dial indicator mounting hole, 7-dial indicator, 8-screw, 9-fastening bolt, 10-bushing, 11-synchronizer gear sleeve and 12-adjusting nut;
101-lower section, 102-flange plate, 103-middle section, 104-upper section;
301-support ring, 302-installation cavity, 303-sleeving cavity;
401-a sleeve barrel, 402-an arm plate, 403-a detection tooth head;
40301-top, 40302-bottom, 40303-side, 40404-end, 40305-double chamfer.
The following examples are provided to explain the present invention in further detail.
Detailed Description
The following embodiments of the present invention are given, and it should be noted that the present invention is not limited to the following embodiments, and all the equivalent transformations made on the basis of the technical solution of the present application all fall into the protection scope of the present invention.
Example (b):
according to the technical scheme, as shown in fig. 1 to 12, the second inverse depth gauge for the synchronizer gear sleeve comprises a mandrel 1, wherein the mandrel 1 is sequentially divided into a lower section 101, a flange plate 102, a middle section 103 and an upper section 104 which are coaxially arranged into a whole from bottom to top;
the lower section 101 is coaxially sleeved with a detection seat 2, and the detection seat 2 is detachably fixed on the flange plate 102;
the detection seat 2 is coaxially sleeved with a lower measuring plate 3, the lower measuring plate 3 is of a hollow structure, a support ring 301 is arranged on the hollow inner wall of the lower measuring plate 3, the support ring 301 divides the lower measuring plate 3 into an upper installation cavity 302 and a lower sleeving cavity 303, the installation cavity 302 is used for installing a synchronizer tooth sleeve 11 to be detected, and the sleeving cavity 303 is sleeved on the top of the detection seat 2;
the middle section 103 is sleeved with an adjusting nut 12, the adjusting nut 12 can move up and down on the middle section 103, the upper section 104 is sleeved with the measuring head 4, and the adjusting nut 12 is used for adjusting the height of the measuring head 4;
the measuring head 4 comprises a sleeve barrel 401 sleeved on the upper section 104, an arm plate 402 is arranged on the sleeve barrel 401 along the radial direction, and a detection tooth head 403 matched with a secondary inverted part of the synchronizer tooth sleeve 11 to be detected is arranged on the outer end face of the arm plate 402; the bottom end surface of the sleeving barrel 401, the bottom end surface of the arm plate 402 and the bottom end surface of the detection gear head 403 are on the same plane; the height of the detection tooth head 403 is smaller than that of the arm plate 402, and the height of the arm plate 402 is smaller than that of the sleeve 401; the top surface 40301 of the detection tooth head 403 is a detection surface;
the top surface of arm board 402 on be provided with can be at the last measuring plate 5 that moves on the top surface of arm board 402, processing has the percentage table mounting hole 6 with dabber 1 parallel arrangement on the last measuring plate 5, install percentage table 7 on the percentage table mounting hole 6, percentage table 7 is used for measuring the difference in height of the top end face of the synchronous ware tooth cover 11 that waits to detect of the height of face of detecting and.
As a specific solution of this embodiment, the detection tooth head 403 has a plane-symmetric structure, and includes a top surface 40301 and a bottom surface 40302 which are parallel, a pair of side surfaces 40303 and an end surface 40304 which are parallel, and two of the top surface 40301 and the bottom surface 40302, and the pair of side surfaces 40303 and the end surface 40304 are perpendicular to each other; a side edge is respectively connected between the top surface 40301 and the pair of side surfaces 40303, a side edge is connected between the top surface 40301 and the end surface 40304, and a side edge is respectively connected between the pair of side surfaces 40303 and the end surface 40304;
the bottom surface 40302 is an isosceles triangle plane, and the end surface 40304 is an axisymmetric pentagonal plane formed by a rectangle and a triangle; the bottom surface 40302 is connected with a pair of side surfaces 40303 through a pair of two inverted slopes 40305 which have the same structure and are symmetrically arranged, and the two inverted slopes 40305 are pentagonal planes; the edge where the pair of double-chamfered surfaces 40305 intersects connects the vertex angle of the bottom surface 40302 and the bottom angle of the end surface 40304, and the edge where the pair of double-chamfered surfaces 40305 intersects is located on the symmetrical surface of the detection bit 403;
two edge edges of the pair of double-reverse inclined surfaces 40305 which are respectively intersected with the bottom surface 40302 are two isosceles oblique edges of the bottom surface 40302, two edge edges of the pair of double-reverse inclined surfaces 40305 which are respectively intersected with the pair of side surfaces 40303 are perpendicular to the end surface 40304, and a first included angle is formed between the two edge edges of the pair of double-reverse inclined surfaces 40305 which are respectively intersected with the end surface 40304; the edge where the pair of two-chamfered surfaces 40305 meets has a second angle with the bottom surface 40302.
As a preferable solution of this embodiment, the first included angle is 100 ° ± 30'; the size of the second included angle is 8 +/-20'; the projection distance of the edge intersected by the pair of the two-reverse inclined surfaces 40305 on the bottom surface 40302 is equal to 0.33 +/-0.01 times of the height of the isosceles triangle plane of the bottom surface 40302.
As a specific scheme of this embodiment, the detection base 2 and the flange plate 102 are connected and fixed by the screw 8, so as to ensure the coaxiality of the core shaft 1 and the detection base 2 in the use process. A plurality of lightening holes can be arranged on the detection seat 2 according to requirements.
As a specific solution of this embodiment, the middle section 103 is connected with an adjusting nut 12 through a threaded connection sleeve, so as to adjust the height of the measuring head 4 more accurately
As a specific scheme of this embodiment, the inner diameter of the mounting cavity 302 is equal to the outer diameter of the synchronizer gear sleeve 11 to be detected, and the inner diameter of the sleeving cavity 303 is equal to the outer diameter of the top of the detection seat 2, so that the coaxiality of the mandrel 1 and the synchronizer gear sleeve 11 to be detected in the use process is ensured.
As a specific scheme of this embodiment, the dial indicator mounting hole 6 is mounted with a fastening bolt 9 for locking the dial indicator 7, and an end of the fastening bolt 9 contacts with a bushing 10 sleeved on the dial indicator 7. The dial indicator 7 can be installed better, and the detection accuracy can be submitted.
The utility model discloses an it is more to examine a ware and consider synchronous ware part kind, and this is examined the utensil and can be done split type, examines the part except measuring down plate 3 and measuring head 4 in the utensil and be the sharing part of examining the utensil, can include all tooth cover class parts of taking two sizes of falling, only measures plate 3 and measuring head 4 down and for this peculiar part of examining the utensil, and a part corresponds a size.
The utility model discloses an examine when using, as shown in fig. 12, the synchronizer gear sleeve 11 that will examine is placed in the installation cavity 302 of measuring plate 3 down, supports with support ring 301. The measuring head 4 is placed in the synchronizer gear sleeve 11 to be detected, the height of the measuring head 4 on the mandrel 1 is adjusted through the adjusting nut 12, the detection gear head 403 is placed at the double-chamfering position of the synchronizer gear sleeve 11 to be detected, a pair of double-chamfering planes 40305 of the detection gear head 403 is matched with the two double-chamfering planes of the synchronizer gear sleeve 11 to be detected for use, the distance from the vertex angle of the bottom surface 40302 to the central axis of the mandrel 1 is just equal to the distribution circle radius of the synchronizer gear sleeve 11 to be detected, namely the distance from the intersected edge starting circle position of the pair of double-chamfering planes 40305 to the central axis of the mandrel 1 is just equal to the distribution circle radius of the synchronizer gear sleeve 11 to be detected. The dial indicator 7 is fixed on the upper measuring plate 5 and the upper measuring plate 5 is placed on the top surface of the arm plate 402 of the measuring head 4. A top surface 40301 of the detection tooth head 403 is a detection surface; and moving the upper measuring plate 5, so that the dial indicator 7 respectively measures the height of the detection surface and the height of the top end surface of the synchronizer gear sleeve 11 to be detected, and calculating the height difference, wherein the size is qualified if the height difference is within the range of +/-0.1.
Claims (7)
1. The synchronizer gear sleeve double-inverted depth gauge is characterized by comprising a mandrel (1), wherein the mandrel (1) is sequentially divided into a lower section (101), a flange plate (102), a middle section (103) and an upper section (104) which are coaxially arranged into a whole from bottom to top;
the lower section (101) is coaxially sleeved with a detection seat (2), and the detection seat (2) is detachably fixed on the flange plate (102);
the detection seat (2) is coaxially sleeved with a lower measuring plate (3), the lower measuring plate (3) is of a hollow structure, a support ring (301) is arranged on the hollow inner wall of the lower measuring plate (3), the support ring (301) divides the lower measuring plate (3) into an upper installation cavity (302) and a lower sleeving cavity (303), the installation cavity (302) is used for installing a synchronizer gear sleeve (11) to be detected, and the sleeving cavity (303) is sleeved at the top of the detection seat (2);
the middle section (103) is sleeved with an adjusting nut (12), the adjusting nut (12) can move up and down on the middle section (103), the upper section (104) is sleeved with a measuring head (4), and the adjusting nut (12) is used for adjusting the height of the measuring head (4);
the measuring head (4) comprises a sleeving cylinder (401) sleeved on the upper section (104), an arm plate (402) is arranged on the sleeving cylinder (401) along the radial direction, and a detection tooth head (403) matched with a double-falling part of a synchronizer tooth sleeve (11) to be detected is arranged on the outer end face of the arm plate (402); the bottom end surface of the sleeve (401), the bottom end surface of the arm plate (402) and the bottom end surface of the detection gear head (403) are on the same plane; the height of the detection tooth head (403) is smaller than that of the arm plate (402), and the height of the arm plate (402) is smaller than that of the sleeve (401); the top surface (40301) of the detection tooth head (403) is a detection surface;
the measuring device is characterized in that an upper measuring plate (5) capable of moving on the top surface of the arm plate (402) is arranged on the top surface of the arm plate (402), a dial indicator mounting hole (6) parallel to the mandrel (1) is machined in the upper measuring plate (5), a dial indicator (7) is mounted in the dial indicator mounting hole (6), and the dial indicator (7) is used for measuring the height of a detection surface and the height difference of the top end surface of a synchronizer gear sleeve (11) to be detected.
2. The synchronizer sleeve double-falling depth gauge according to claim 1, wherein the detection tooth head (403) is of a plane-symmetrical structure and comprises a top surface (40301) and a bottom surface (40302) which are parallel, a pair of side surfaces (40303) and an end surface (40304) which are parallel, and the top surface (40301) and the bottom surface (40302), the pair of side surfaces (40303) and the end surface (40304) are perpendicular to each other in pairs; the top surface (40301) is connected with the pair of side surfaces (40303) through a side edge respectively, the top surface (40301) is connected with the end surface (40304) through a side edge, and the pair of side surfaces (40303) is connected with the end surface (40304) through a side edge respectively;
the bottom surface (40302) is an isosceles triangle plane, and the end surface (40304) is an axisymmetric pentagonal plane formed by a rectangle and a triangle; the bottom surface (40302) is connected with the pair of side surfaces (40303) through a pair of symmetrically arranged double-chamfer surfaces (40305) with the same structure, and the double-chamfer surfaces (40305) are pentagonal planes; edges intersected by the pair of double-chamfer surfaces (40305) are connected with top corners of the bottom surface (40302) and bottom corners of the end surface (40304), and the edges intersected by the pair of double-chamfer surfaces (40305) are positioned on a symmetrical surface of the detection tooth head (403);
two edge edges of the pair of two inverted slopes (40305) which are respectively intersected with the bottom surface (40302) are two isosceles oblique edges of the bottom surface (40302), two edge edges of the pair of two inverted slopes (40305) which are respectively intersected with the pair of side surfaces (40303) are perpendicular to the end surface (40304), and a first included angle is formed between two edge edges of the pair of two inverted slopes (40305) which are respectively intersected with the end surface (40304); a second included angle is formed between the edge where the two inverted inclined surfaces (40305) intersect and the bottom surface (40302).
3. The synchronizer sleeve double depth gauge according to claim 2, wherein the first included angle is 100 ° ± 30'; the size of the second included angle is 8 +/-20'; the projection distance of the edge intersected by the pair of the two reverse inclined surfaces (40305) on the bottom surface (40302) is equal to 0.33 +/-0.01 times of the height of the isosceles triangle plane of the bottom surface (40302).
4. The synchronizer sleeve double-depth gauge according to claim 1, wherein the detection seat (2) and the flange plate (102) are fixedly connected through a screw (8).
5. The synchronizer gear sleeve double-chamfering depth checking fixture according to claim 1, wherein the middle section (103) is sleeved with an adjusting nut (12) through threaded connection.
6. The synchronizer sleeve gear double-falling depth gauge according to claim 1, wherein the inner diameter of the mounting cavity (302) is equal to the outer diameter of the synchronizer sleeve gear (11) to be tested, and the inner diameter of the sleeving cavity (303) is equal to the outer diameter of the top of the detection seat (2).
7. The synchronizer gear sleeve double-falling depth detection tool as claimed in claim 1, wherein a fastening bolt (9) for locking the dial indicator (7) is mounted on the dial indicator mounting hole (6), and the end of the fastening bolt (9) is in contact with a bushing (10) sleeved on the dial indicator (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922019291.XU CN211262083U (en) | 2019-11-20 | 2019-11-20 | Utensil is examined to two depths of falling of synchronous ware tooth cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922019291.XU CN211262083U (en) | 2019-11-20 | 2019-11-20 | Utensil is examined to two depths of falling of synchronous ware tooth cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211262083U true CN211262083U (en) | 2020-08-14 |
Family
ID=71959907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922019291.XU Active CN211262083U (en) | 2019-11-20 | 2019-11-20 | Utensil is examined to two depths of falling of synchronous ware tooth cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211262083U (en) |
-
2019
- 2019-11-20 CN CN201922019291.XU patent/CN211262083U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106017285A (en) | Verticality and symmetry degree testing tool for piston pin hole | |
| CN103245279B (en) | A kind of axial workpiece symmetry somascope | |
| CN215909776U (en) | Utensil is examined to gear tooth position degree | |
| CN211262083U (en) | Utensil is examined to two depths of falling of synchronous ware tooth cover | |
| CN210981108U (en) | Internal spline tooth top circle diameter inspection fixture | |
| CN203298707U (en) | Symmetry detector for shafts | |
| CN112146553A (en) | Inner inclined hole position size measuring device and design and use method thereof | |
| CN217520373U (en) | Lithium battery module installation hole site position degree detection device | |
| CN202661012U (en) | Outer spherical diameter and profile measuring instrument | |
| CN211783223U (en) | Micrometer for measuring pitch of holes | |
| CN211717320U (en) | Utensil is examined to bevel gear | |
| CN211042049U (en) | Utensil is examined to accurate measurement slot position | |
| CN110849246A (en) | Device and method for rapidly detecting size of inner arc of magnetic shoe | |
| CN201440064U (en) | Measuring device for measuring space between two holes | |
| CN111256644A (en) | Dimension measuring tool for factory detection of driving gear | |
| CN110940248A (en) | Single-product checking fixture for lower connecting piece of right side bracket of automobile seat backrest | |
| CN205245927U (en) | 0. 7 size in measurable quantity terminal surface tooth examine utensil | |
| CN212458217U (en) | Special detection tool for depth of engine cylinder sleeve seat | |
| CN210346626U (en) | General side window checking fixture | |
| CN212399000U (en) | Cradle type five-axis machine tool geometric accuracy alignment structure | |
| CN215893458U (en) | Detection tool for peripheral sealing surface of cone | |
| CN219368609U (en) | Device for checking gap between fuel rod and lower tube seat of fuel assembly | |
| CN219301448U (en) | Size inspection device | |
| CN214702062U (en) | Detection tool for measuring inner spherical diameter and spherical center height of differential shell product | |
| CN221037252U (en) | Detection device for concentricity and verticality of synchronous pulley |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |