CN223211252U - A hydraulic release bearing limiting device - Google Patents

A hydraulic release bearing limiting device

Info

Publication number
CN223211252U
CN223211252U CN202422491912.5U CN202422491912U CN223211252U CN 223211252 U CN223211252 U CN 223211252U CN 202422491912 U CN202422491912 U CN 202422491912U CN 223211252 U CN223211252 U CN 223211252U
Authority
CN
China
Prior art keywords
sleeve
release bearing
separating
limiting
bearing support
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
Application number
CN202422491912.5U
Other languages
Chinese (zh)
Inventor
霍宇琛
赵曌
姜鑫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shaanxi Fast Gear Co Ltd
Original Assignee
Shaanxi Fast Gear Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shaanxi Fast Gear Co Ltd filed Critical Shaanxi Fast Gear Co Ltd
Priority to CN202422491912.5U priority Critical patent/CN223211252U/en
Application granted granted Critical
Publication of CN223211252U publication Critical patent/CN223211252U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Support Of The Bearing (AREA)

Abstract

本实用新型涉及轴承限位装置,具体涉及一种液压分离轴承限位装置,为解决现有分离轴承支撑套存在适应性较差以及结构稳定性不足的问题,限位装置包括离壳定位结构总成、分离轴承支撑套、N个弹性伸缩组件以及调整套,其中,N≥2;离壳定位结构总成包括筒形的定心套以及定位结构;定心套的一端为开口端,另一端设置有底板,底板沿中心轴线开设第一通孔;分离轴承支撑套同轴套设在定心套内,能够在第一通孔内轴向运动;分离轴承支撑套的外壁设置有限位台阶;N个弹性伸缩组件分别设置在限位台阶与底板之间;调整套套设在分离轴承支撑套外,两端分别与第一限位凸台和限位台阶相抵。

The utility model relates to a bearing limiting device, specifically to a hydraulic release bearing limiting device. In order to solve the problems of poor adaptability and insufficient structural stability of the existing release bearing support sleeve, the limiting device includes a shell-separating positioning structure assembly, a release bearing support sleeve, N elastic telescopic components and an adjustment sleeve, wherein N≥2; the shell-separating positioning structure assembly includes a cylindrical centering sleeve and a positioning structure; one end of the centering sleeve is an open end, and the other end is provided with a bottom plate, and the bottom plate has a first through hole along the central axis; the release bearing support sleeve is coaxially sleeved in the centering sleeve and can move axially in the first through hole; a limiting step is provided on the outer wall of the release bearing support sleeve; N elastic telescopic components are respectively arranged between the limiting step and the bottom plate; the adjustment sleeve is arranged outside the release bearing support sleeve, and its two ends are respectively against the first limiting boss and the limiting step.

Description

Hydraulic release bearing limiting device
Technical Field
The utility model relates to a bearing limiting device, in particular to a hydraulic release bearing limiting device.
Background
When the actuator of the automatic transmission is filled with the working fluid, the hydraulic release bearing is spaced from the end face of the spigot of the clutch housing by various distances, the hydraulic release bearing is required to be positioned at an initial installation position during filling, and in the filling process, the limit position of the hydraulic release bearing is ensured not to exceed the allowable maximum displacement of the hydraulic release bearing. The conventional method is to install the corresponding clutch and clamp the clutch to the test bed to limit the hydraulic release bearing, and the problems of difficult tool replacement, low production efficiency, low limiting precision, difficult clamping of the transmission and incapability of realizing on-line production of the hydraulic release bearing exist due to large volume and heavy dead weight of the test bed tool and the clutch.
The Chinese patent with publication number of CN202674092U discloses a release bearing assembly of an automobile hydraulic clutch, which comprises a release bearing unit and a hydraulic moving unit, wherein a spring washer is arranged in the release bearing unit and provides axial precompression force, so that the release bearing unit has an automatic aligning function, the installation accuracy of the release bearing is improved, and the position of the release bearing in the installation process is still difficult to control. The Chinese patent with publication number of CN216343539U discloses a support sleeve of a release bearing, which realizes the guiding and supporting of the axial movement of the hydraulic release bearing by arranging a sleeve between the hydraulic release bearing and an input shaft of a speed changer, and the end part of the sleeve is connected with a front shell of the speed changer through a connecting part, so that the axial positioning of the hydraulic release bearing is further realized. But it is mainly used in the normal driving of vehicle, only can be used for the direction and the support of hydraulic release bearing axial displacement, and is relatively poor to the adaptability of not unidimensional hydraulic release bearing, and can't realize overload protection, leads to the stability of structure not enough.
Disclosure of utility model
The utility model aims to solve the problems of poor adaptability and insufficient structural stability of the existing release bearing support sleeve, and provides a hydraulic release bearing limiting device.
In order to achieve the above purpose, the technical solution provided by the present utility model is as follows:
The hydraulic release bearing limiting device is characterized by comprising a release shell positioning structure assembly, a release bearing supporting sleeve, N elastic telescopic components and an adjusting sleeve, wherein N is more than or equal to 2, the release shell positioning structure assembly comprises a cylindrical centering sleeve and a positioning structure, one end of the centering sleeve is an open end, a bottom plate is arranged at the other end of the centering sleeve, a first through hole is formed in the bottom plate along a central axis, the positioning structure is arranged on the outer wall of the centering sleeve and used for being connected and positioned with a clutch shell, the release bearing supporting sleeve is coaxially sleeved in the centering sleeve, one end of the release bearing supporting sleeve extends out of the open end of the centering sleeve, a first limiting boss is arranged on the outer wall close to the end around the circumference of the release bearing supporting sleeve, the other end of the release bearing supporting sleeve extends out of the first through hole, an annular gap is arranged between the release bearing supporting sleeve and the inner wall of the first through hole, so that the release bearing supporting sleeve can axially move in the first through hole, a second through hole is formed in the release bearing supporting sleeve along the central axis, a limiting step is arranged on the outer wall of the release bearing supporting sleeve around the circumference of the release bearing supporting sleeve, the limiting step is positioned in the centering sleeve, one end of the release bearing supporting sleeve, N elastic telescopic components are arranged between N elastic telescopic components and the bottom plate and the elastic telescopic components respectively, and the elastic telescopic components are arranged under the limit step F0 respectively:
F1≤F0<F2
Wherein F1 is the mounting force of the hydraulic release bearing to be limited, and F2 is the maximum working pressure of the hydraulic release bearing to be limited;
The adjusting sleeve is sleeved outside the release bearing supporting sleeve, and two ends of the adjusting sleeve respectively prop against the first limiting boss and the limiting step.
Further, the total pre-pressure F0 satisfies the following relationship:
1.1F1≤F0≤1.5F1<F2。
Further, the elastic telescopic assembly comprises a guide fixing piece, a guide rod and a spring;
the N guide fixing pieces of the elastic telescopic assemblies are of an integrated structure to form a guide ring;
the guide ring is sleeved outside the adjusting sleeve and is connected with the opening end of the centering sleeve;
one end of the guide rod penetrates through the bottom plate, and the other end of the guide rod penetrates through the limit step to be connected with the guide ring;
The spring is sleeved on the guide rod, and two ends of the spring are respectively propped against the bottom plate and the limiting step.
Further, one end of the guide rod is provided with a second limiting boss for abutting against one side, far away from the spring, of the bottom plate, and the other end of the guide rod is provided with a thread structure for being in threaded connection with the guide fixing piece.
Further, the guide ring is connected with the open end of the centering sleeve through a positioning pin.
Further, the location structure includes along the at least three location connecting rod of centering cover circumference setting, the one end of location connecting rod with centering cover is connected, and the other end sets up the third through-hole, is equipped with the anti-rotation bolt in the third through-hole, and the cover is equipped with hexagon nut on the anti-rotation bolt for be connected with the locating hole on the external clutch.
Further, the device also comprises a spring pressing sleeve sleeved between the release bearing supporting sleeve and the limiting step;
the adjusting sleeve is close to the two ends of the supporting sleeve part of the release bearing and is abutted between the first limiting boss and the spring pressing sleeve, and the two ends of the other part of the adjusting sleeve are abutted between the first limiting boss and the limiting step;
The end of the spring is propped against the step surface of the second step.
Further, the spring pressing sleeve, the release bearing supporting sleeve and the adjusting sleeve are connected through bolts.
The utility model has the beneficial effects that:
1. According to the hydraulic release bearing, the release shell positioning structure assembly, the release bearing supporting sleeve and the elastic telescopic component are arranged, so that the position of the hydraulic release bearing is limited, the problems that the position of the hydraulic release bearing is low in limiting precision, difficult in tooling replacement and low in production replacement efficiency when the working fluid is filled are solved, the online production of the hydraulic release bearing cannot be realized, the filling requirement is met, and the release failure of the hydraulic release bearing is prevented.
2. According to the utility model, the adjusting sleeve is arranged, the working fluid is filled into the transmission with different specifications from the axial dimension of the hydraulic release bearing to the spigot end face of the clutch housing, so that the flexible design is realized.
3. The utility model adopts a lightweight design, has small volume, short size chain, high limit precision and easy maintenance, and compared with the prior scheme of using a clutch and a positioning test tray to be arranged on an off-line test rack, the utility model can realize on-line installation, avoid the on-line internal and external transportation of a transmission and shorten the production beat.
4. According to the utility model, the spring, the guide rod, the bottom plate and the limiting step are arranged for elastic limiting, so that the motor of the actuator can be prevented from being locked and overloaded during filling.
Drawings
FIG. 1 is a schematic cross-sectional view of an embodiment of the present utility model;
FIG. 2 is a schematic diagram of an off-shell positioning structure assembly according to an embodiment of the present utility model;
FIG. 3 is a schematic three-dimensional structure of an embodiment of the present utility model;
FIG. 4 is a schematic view of the structure of the installation state of the embodiment of the present utility model;
FIG. 5 is a schematic cross-sectional view of an installed state of an embodiment of the present utility model;
Fig. 6 is a schematic diagram of spring deformation in an embodiment of the utility model.
Reference numerals illustrate:
1-shell-leaving positioning structure assembly, 11-centering sleeve, 12-positioning structure, 2-guide rod, 3-spring pressing sleeve, 31-limiting step, 32-first step, 33-second step, 4-release bearing supporting sleeve, 41-hydraulic release bearing, 5-adjusting sleeve, 6-guide fixing piece, 7-rotation-preventing bolt, 8-positioning pin, 9-spring and 10-hexagonal nut.
Detailed Description
The structure of the hydraulic release bearing limiting device is shown in fig. 1, and comprises a release bearing supporting sleeve 4, N elastic telescopic components and an adjusting sleeve 5,N is more than or equal to 2, wherein in the embodiment, N=4.
The shell-separating positioning structure assembly 1 comprises a cylindrical centering sleeve 11 and a positioning structure 12, as shown in fig. 2, in the embodiment, three positioning structures 12 are arranged, one end of the centering sleeve 11 is an open end, the other end of the centering sleeve is provided with a bottom plate, a first through hole is formed in the bottom plate along a central axis, the positioning structure 12 comprises at least three positioning connecting rods circumferentially arranged along the centering sleeve 11, one ends of the positioning connecting rods are connected with the centering sleeve 11, welding is adopted in the embodiment, and in order to ensure the centering positioning and axial limiting precision, the dimensions related to matching are processed after welding.
The separating bearing support sleeve 4 is coaxially sleeved in the centering sleeve 11, one end of the separating bearing support sleeve 4 extends out of the opening end of the centering sleeve 11, a first limit boss is arranged on the outer wall close to the end around the circumference of the opening end, the other end of the separating bearing support sleeve 4 extends out of the first through hole, an annular gap is arranged between the separating bearing support sleeve and the inner wall of the first through hole, the separating bearing support sleeve 4 can axially move in the first through hole, a second through hole is formed in the separating bearing support sleeve 4 along the central axis of the separating bearing support sleeve, the second through hole is a step hole, the large-diameter end corresponds to the first limit boss, the structural size is reduced as much as possible in consideration of the fact that the weight of the hydraulic separating bearing limiting device cannot be too large, the structural design is compact, the size of the separating bearing support sleeve 4 is relatively close to the size of the hydraulic separating bearing 41, therefore the step hole is formed, structural interference between the separating bearing support sleeve 4 and the front end of the hydraulic separating bearing 41 is avoided, and the first through hole is large enough in size, and the step hole is not required to be formed. The middle part of the outer wall of the release bearing supporting sleeve 4 is sleeved with a spring pressing sleeve 3, the outer wall of the spring pressing sleeve 3 is provided with a limiting step 31 around the circumferential direction, the adjusting sleeve 5 is sleeved outside the release bearing supporting sleeve 4, two ends of the adjusting sleeve 5, which are close to the release bearing supporting sleeve 4, are respectively abutted against the first limiting boss and the spring pressing sleeve 3, two ends of the other part are respectively abutted against the first limiting boss and the limiting step 31, the adjusting sleeve 5 has various specifications and corresponds to the speed change of different sizes, and the change is convenient, so that the adjusting sleeve is suitable for different distances from the hydraulic release bearing 41 to the clutch spigot of the speed change.
The limiting step 31 comprises a first step 32 and a second step 33 which are continuously arranged, the elastic telescopic assembly comprises a guide fixing piece 6, a guide rod 2 and a spring 9, the guide fixing pieces 6 of the 4 elastic telescopic assemblies are of an integrated structure for convenient installation, a guide ring is formed and sleeved outside the adjusting sleeve 5 and connected with the opening end of the centering sleeve 11 through a positioning pin, one end of the guide rod 2 is arranged on the bottom plate in a penetrating mode, a second limiting boss is arranged at the end of the guide rod, the second limiting boss abuts against one side of the bottom plate far away from the guide ring, a threaded structure is arranged at the other end of the guide rod 2, the guide rod penetrates through the second step 33 and is in threaded connection with the guide ring, the spring 9 is sleeved on the guide rod 2, two ends of the spring 9 abut against the step surfaces of the bottom plate and the second step 33 respectively, the side wall of the first step 32 contacts with the outer side surface of the spring 9, limiting is carried out on the outer side surface of the guide ring, and the stability of the second step is improved. The guide bar 2 provides guidance for the second step 33 and the spring 9, avoiding its deflection. The springs 9 are preloaded during installation, the total preload of the springs 9 being slightly greater than the installation force of the hydro-release bearing 41 in order to limit the hydro-release bearing 41 to the initial installation position. The limiting of the hydraulic release bearing 41 can be realized by the value range of F1-F0 < F2 of the total precompression F0 of the 4 springs 9, wherein F1 is the mounting force of the hydraulic release bearing 41 to be limited, F2 is the maximum working pressure of the hydraulic release bearing 41 to be limited, but if the precompression of the springs 9 is too large, the length of the springs 9 is too long, the axial dimension of the hydraulic release bearing limiting device is increased, if the precompression of the springs 9 is too small, the precompression is insufficient to overcome the mounting force, and the hydraulic release bearing 41 cannot be limited to the initial mounting position, so that in actual operation, the value range of the total precompression F0 is preferably 1.1F1-F0-1.5F2.
The guide fixing piece 6 is provided with a pin hole corresponding to one end of the centering sleeve 11, wherein the positioning pin 8 is arranged to realize fixed connection, so that the guide failure of the guide rod 2 caused by the rotation of the guide fixing piece 6 is prevented.
In order to improve the stability of the hydraulic release bearing limiting device and facilitate the disassembly and the assembly, the spring pressing sleeve 3, the release bearing supporting sleeve 4 and the adjusting sleeve 5 are connected and pressed through bolts, and bear the thrust from the hydraulic release bearing 41 together.
As shown in fig. 2 to 4, a third through hole is formed at the other end of the positioning connecting rod and corresponds to a positioning hole on the clutch housing of the transmission, an anti-rotation bolt 7 is arranged in the corresponding third through hole and positioning hole, a hexagonal nut 10 is sleeved on the anti-rotation bolt 7 for fixation, and the connection positioning of the hydraulic release bearing limiting device and the clutch housing of the transmission is realized. The specific use process of the utility model is as follows:
1. And (3) installing a limiting device, namely, as shown in fig. 4 and 5, firstly, selecting a proper adjusting sleeve 5 according to the size of the transmission, installing the adjusting sleeve 5 between a release bearing supporting sleeve 4 and a spring pressing sleeve 3, aligning three claws of a limiting tool with a clutch shell spigot of the transmission, applying axial force, and pushing a hydraulic release bearing 41 to an initial installation position, wherein the installation force of the hydraulic release bearing 41 is smaller than the pre-pressure of a spring 9, and as shown in fig. 6, the spring 9 is positioned at the initial installation position after being pre-pressed, the spring 9 cannot be deformed further in the installation process, and the limiting device and the clutch shell of the transmission are fixed through a hexagonal nut 10, so that the installation can be completed.
2. Filling working fluid, namely filling the working fluid after installing the limiting device, wherein the hydraulic release bearing 41 can reciprocate during filling, the spring 9 works in the working deformation area shown in fig. 6, and when the pressure is too high, the spring 9 works in the overload deformation area, and the process is still elastic deformation, so that buffering can be provided before the protection program of the motor is started, and the motor is prevented from being blocked and damaged.
3. And (5) filling is completed, and the limiting device is dismounted.
While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made without departing from the spirit and scope of the utility model.

Claims (8)

1. A hydraulic release bearing stop device, its characterized in that:
Comprises a shell-separating positioning structure assembly (1), a release bearing supporting sleeve (4), N elastic telescopic components and an adjusting sleeve (5), wherein N is more than or equal to 2;
the shell-separating positioning structure assembly (1) comprises a cylindrical centering sleeve (11) and a positioning structure (12);
The clutch shell comprises a clutch shell, a positioning structure (12) and a clutch sleeve, wherein one end of the centering sleeve (11) is an open end, and the other end of the centering sleeve is provided with a bottom plate which is provided with a first through hole along a central axis;
The separating bearing support sleeve (4) is coaxially sleeved in the centering sleeve (11), one end of the separating bearing support sleeve (4) extends out of the opening end of the centering sleeve (11), a first limit boss is arranged on the outer wall close to the end around the circumference of the opening end, the other end of the separating bearing support sleeve (4) extends out of the first through hole, an annular gap is arranged between the separating bearing support sleeve and the inner wall of the first through hole, so that the separating bearing support sleeve (4) can axially move in the first through hole, a second through hole is formed in the separating bearing support sleeve (4) along the central axis of the separating bearing support sleeve, a limit step (31) is arranged in the middle of the outer wall of the separating bearing support sleeve (4) around the circumference of the separating bearing support sleeve, and the limit step (31) is positioned in the centering sleeve (11);
The N elastic telescopic components are respectively arranged between the limiting step (31) and the bottom plate, and the total precompression F0 of the N elastic telescopic components meets the following relation:
F1≤F0<F2
Wherein F1 is the mounting force of the hydraulic release bearing (41) to be limited, and F2 is the maximum working pressure of the hydraulic release bearing (41) to be limited;
The adjusting sleeve (5) is sleeved outside the release bearing supporting sleeve (4), and two ends of the adjusting sleeve are respectively propped against the first limiting boss and the limiting step (31).
2. A hydraulic release bearing spacing device as claimed in claim 1, wherein:
The total pre-pressure F0 satisfies the following relationship:
1.1F1≤F0≤1.5F1<F2。
3. a hydraulic release bearing spacing device as claimed in claim 2, wherein:
The elastic telescopic assembly comprises a guide fixing piece (6), a guide rod (2) and a spring (9);
the N guide fixing pieces (6) of the elastic telescopic assemblies are of an integrated structure to form a guide ring;
The guide ring is sleeved outside the adjusting sleeve (5) and is connected with the opening end of the centering sleeve (11);
One end of the guide rod (2) is arranged on the bottom plate in a penetrating way, and the other end of the guide rod passes through the limit step (31) to be connected with the guide ring;
the spring (9) is sleeved on the guide rod (2), and two ends of the spring are respectively propped against the bottom plate and the limiting step (31).
4. A hydrostatic release bearing spacing apparatus as claimed in claim 3, wherein:
one end of the guide rod (2) is provided with a second limiting boss for leaning against one side of the bottom plate away from the spring (9), and the other end of the guide rod is provided with a thread structure for being in threaded connection with the guide fixing piece (6).
5. A hydrostatic release bearing spacing device as claimed in claim 3 or 4, wherein:
the guide ring is connected with the opening end of the centering sleeve (11) through a positioning pin (8).
6. A hydraulic release bearing spacing device as claimed in claim 1, wherein:
The positioning structure (12) comprises at least three positioning connecting rods which are circumferentially arranged along the centering sleeve (11), one end of each positioning connecting rod is connected with the centering sleeve (11), a third through hole is formed in the other end of each positioning connecting rod, an anti-rotation bolt (7) is arranged in each third through hole, and a hexagonal nut (10) is sleeved on each anti-rotation bolt (7) and used for being connected with a positioning hole on an external clutch.
7. A hydraulic release bearing spacing device as claimed in claim 2, wherein:
The spring pressing sleeve (3) is sleeved between the release bearing supporting sleeve (4) and the limiting step (31);
The two ends of the adjusting sleeve (5) close to the part of the release bearing supporting sleeve (4) are abutted between the first limiting boss and the spring pressing sleeve (3), and the two ends of the other part are abutted between the first limiting boss and the limiting step (31), wherein the limiting step (31) comprises a first step (32) and a second step (33) which are continuously arranged, and the circumferential side wall of the first step (32) is in contact with the side surface of the spring (9);
the end of the spring (9) is abutted against the step surface of the second step (33).
8. The hydraulic release bearing spacing device of claim 7, wherein:
The spring pressing sleeve (3), the release bearing supporting sleeve (4) and the adjusting sleeve (5) are connected through bolts.
CN202422491912.5U 2024-10-15 2024-10-15 A hydraulic release bearing limiting device Active CN223211252U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202422491912.5U CN223211252U (en) 2024-10-15 2024-10-15 A hydraulic release bearing limiting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202422491912.5U CN223211252U (en) 2024-10-15 2024-10-15 A hydraulic release bearing limiting device

Publications (1)

Publication Number Publication Date
CN223211252U true CN223211252U (en) 2025-08-12

Family

ID=96645805

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202422491912.5U Active CN223211252U (en) 2024-10-15 2024-10-15 A hydraulic release bearing limiting device

Country Status (1)

Country Link
CN (1) CN223211252U (en)

Similar Documents

Publication Publication Date Title
CN223211252U (en) A hydraulic release bearing limiting device
CN112122649B (en) Drilling and riveting pin device and method for bevel pinion of motor shaft of speed reducer
CN116398548B (en) High-speed overlength axle and bearing structure thereof
CN113305778A (en) Manipulator bearing dismounting device
CN217776876U (en) Motor bearing assembly and disassembly tools
CN111842502B (en) A kind of auxiliary tooling for rolling mill roller
CN216577635U (en) Coupler drawing device
CN117405292A (en) High speed dynamic balancing device
CN211966206U (en) Special tip device for machining thin shaft type gear
CN217833409U (en) Limiting mechanism
CN212553647U (en) Bearing assembly structure
CN116394178B (en) A compressor rotor cold pressing assembly device and method
CN223669941U (en) Inner diameter shaping device for steel pipe to be shaped after punching
CN223354116U (en) An automatic clamping device for an oil pump
CN222133704U (en) Positioning mechanism for cycloidal gear double-piece gear grinding
CN221097227U (en) Bearing connecting device for mechanical equipment
RU220162U1 (en) Installation for assembling an elastomeric draft gear
CN223441525U (en) A ball valve maintenance tool
CN222650403U (en) Bearing outer ring fixing device
CN223684709U (en) A welding fixture for automotive shock absorber piston rods
CN223617244U (en) High-precision clamping device capable of converting axial force into axial and radial force
CN223198459U (en) A floating pressure head device for installing a bushing
CN219027380U (en) Turbine rotor assembly tool
CN218285366U (en) Pressing sleeve device for curved surface mounting bushing of aircraft assembly tool
CN222932180U (en) Ball cage dismounting device

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant