CN110542501A - Ball screw transmission efficiency test system - Google Patents
Ball screw transmission efficiency test system Download PDFInfo
- Publication number
- CN110542501A CN110542501A CN201910751887.0A CN201910751887A CN110542501A CN 110542501 A CN110542501 A CN 110542501A CN 201910751887 A CN201910751887 A CN 201910751887A CN 110542501 A CN110542501 A CN 110542501A
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- support
- nut
- spring support
- ball screw
- shell
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/26—Devices for measuring efficiency, i.e. the ratio of power output to power input
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/027—Test-benches with force-applying means, e.g. loading of drive shafts along several directions
Abstract
The invention provides a ball screw transmission efficiency testing system, which can realize the measurement of the linear efficiency of a ball screw and overcome the defect that only the efficiency of a point can be measured in the prior art. The testing system comprises a shell, a screw rod support, a nut support, a screw rod shifting fork and an axial force measuring assembly, wherein the screw rod support, the nut support, the screw rod shifting fork and the axial force measuring assembly are arranged inside the shell; the ball screw to be tested is supported in the shell; the screw rod shifting fork connected with the screw rod is used for applying torque to the screw rod, and the torque sensor arranged at the tail end of the screw rod shifting fork is used for measuring the actual torque value of the screw rod; the nut support is fixedly connected with the nut, and the nut support is in sliding fit with the inner surface of the shell, so that the nut support and the nut can move together along the axial direction of the lead screw; the axial force measuring assembly is arranged between the nut support and the bottom surface of the shell and used for measuring the axial force of the ball screw to be tested. For the measurement of the large-bearing transmission efficiency of the ball screw, a scheme of sharing the axial force evenly through the matching of a plurality of groups of disc spring assemblies is adopted.
Description
Technical Field
The invention relates to a transmission efficiency testing system, in particular to a ball screw transmission efficiency testing system, and belongs to the field of mechanical engineering.
background
the ball screw is a mechanical element composed of a screw, a nut, balls and the like, and has the function of converting rotary motion into linear motion or converting linear motion into rotary motion. In the ball screw, the balls which roll freely transmit force and motion between the screw and the nut, the transmission mode replaces the direct action mode of the screw and the nut of the traditional threaded screw, the sliding friction of the traditional screw is replaced by the extremely small rolling friction, and the transmission efficiency is greatly improved.
The transmission efficiency of the ball screw is an important index of a product, a special measurement system and a test method are usually adopted for testing, fig. 1 is a ball screw transmission efficiency test schematic diagram in the prior art, and the test system is composed of a driving motor, a torque sensor, a rotation limiting support, a tension pressure sensor, a loading oil cylinder, a control system, a data acquisition system and the ball screw. The driving motor is used for providing rated torque; the torque sensor is used for testing an actual value T of rated torque; the rotation limiting support is used for fixing the nut, limiting the rotation of the nut and connecting the nut and the loading oil cylinder into a fixed whole; and the pull pressure sensor actually measures the load F of the nut along the axial direction. The transmission efficiency of the ball screw tested in the test is shown as formula, wherein eta is the transmission efficiency, and P is the lead of the screw.
the main problems of the testing system and the testing method of the screw efficiency in the prior art are as follows:
(1) the tested screw efficiency is the efficiency of a certain point on the screw, and the position of a measuring point is usually limited by an installation tool and cannot be adjusted;
(2) The efficiency of the ball screw is not a fixed value at each position when the nut slides on the screw due to self processing deviation of the screw, the nut, the ball and the like and assembly errors after assembly, and the efficiency of a certain point is tested and cannot represent the overall efficiency of the ball screw.
Disclosure of Invention
In view of this, the present invention provides a system for testing transmission efficiency of a ball screw, which can measure linear efficiency (i.e. transmission efficiency within a certain range of travel) of the ball screw, and overcome the defect that only point efficiency can be measured in the prior art; meanwhile, the ball screw can be measured with large bearing transmission efficiency.
the ball screw transmission efficiency test system comprises: the device comprises a shell, a screw rod bracket, a nut bracket, a screw rod shifting fork and an axial force measuring assembly, wherein the screw rod bracket, the nut bracket, the screw rod shifting fork and the axial force measuring assembly are arranged in the shell;
The ball screw to be tested comprises a screw rod and a nut;
A ball screw to be tested is supported inside the shell; the screw rod shifting fork connected with the screw rod is used for applying torque to the screw rod, and the torque sensor arranged at the tail end of the screw rod shifting fork is used for measuring the actual torque value of the screw rod;
The nut support is fixedly connected with the nut, and is in sliding fit with the inner surface of the shell, so that the nut support and the nut can move together along the axial direction of the lead screw;
the axial force measuring assembly is arranged between the nut support and the bottom surface of the shell and used for measuring the axial force of the ball screw to be tested.
As a preferred embodiment of the present invention: n axial force measuring assemblies are uniformly distributed between the nut support and the bottom surface of the shell along the circumferential direction, n is an integer greater than or equal to 2, the measured value of the ith axial force measuring assembly is Fi, and then the axial force of the ball screw to be tested is measured
As a preferred embodiment of the present invention: the axial force measurement assembly includes: the device comprises a lower adapter rack, a force sensor, a lower spring bracket, a compression spring, an upper spring bracket and an upper adapter rack;
The upper spring support and the lower spring support are coaxially butted to form a cylindrical structure, and the upper spring support can move relative to the lower spring support along the axial direction of the upper spring support and the lower spring support; the compression spring is sleeved outside a cylindrical structure formed by butting the upper spring support and the lower spring support, one end of the compression spring is abutted against a shaft shoulder at the end part of the upper spring support, and the other end of the compression spring is abutted against a shaft shoulder at the end part of the lower spring support;
The upper spring bracket is fixedly connected with the nut bracket through an upper adapter bracket; the lower spring support is opposite to the lower adapter support, and a force sensor is arranged between contact surfaces; the lower adapter rack is fixedly connected with the shell;
And the measuring stroke of the ball screw to be tested is L0, and the compression stroke LD of the compression spring is more than or equal to L0.
As a preferred embodiment of the present invention: the upper spring support and the lower spring support are both of a cylindrical structure with one end opened and one end provided with a shaft shoulder; when in butt joint, the open ends of the upper spring bracket and the lower spring bracket are opposite; a spring connecting rod is arranged in the middle of a cylindrical structure formed by the upper spring support and the lower spring support, and plays a role in guiding the movement of the upper spring support relative to the lower spring support, one end of the spring connecting rod is in threaded connection with the lower spring support, the other end of the spring connecting rod passes through a through hole in the center of the upper spring support and then is axially limited through a nut, and the spring connecting rod is in sliding fit with the through hole in the center of the upper spring support;
More than two strip-shaped open grooves are uniformly distributed at the open ends of the upper spring support and the lower spring support along the circumferential direction, so that the open ends of the upper spring support and the lower spring support are in a structural form that the strip-shaped open grooves and the strip-shaped bulges are distributed at intervals along the circumferential direction; when the compression spring is installed, the positions of the strip-shaped opening grooves on the upper spring support and the positions of the strip-shaped bulges on the lower spring support are in one-to-one correspondence, so that the upper spring support can move relative to the lower spring support when the compression spring is compressed;
the matching length LK between the strip-shaped open slot on the disc spring upper support and the strip-shaped bulge on the disc spring lower support is larger than or equal to LD.
Has the advantages that:
(1) The transmission efficiency of the ball screw measured by the test system is linear efficiency, the measurement precision is high, and the defect that only point efficiency can be measured in the prior art is overcome.
(2) the invention can realize the measurement of the large-bearing transmission efficiency of the ball screw by sharing the axial force evenly through the matching of the plurality of groups of axial force testing assemblies.
Drawings
FIG. 1 is a diagram of a ball screw transmission efficiency testing system in the prior art;
FIG. 2 is a block diagram of a ball screw transmission efficiency testing system according to the present invention;
FIG. 3 is a structural view of a nut holder according to the present invention;
FIG. 4 is a structural view of the housing of the present invention;
FIG. 5 is a view of the components of the measuring assembly of the present invention;
FIG. 6 is a schematic view of the spring top mount of the present invention;
FIG. 7 is a schematic representation of the spring lower mount of the present invention;
wherein: 1-a shell; 2-a screw bracket; 3-a bearing cap; 4-a thrust bearing; 5-lower radial bearing; 6-a lead screw; 7-a nut; 8-nut support; 9-upper radial bearing; 10-a top cover; 11-a lead screw fork; 12-lower transfer stage; 13-a force sensor; 14-a lower spring support; 15-spring link; 16-a compression spring; 17-spring upper support; 18-upper transfer rack; 101-a guide groove; 801-ear.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
Example 1:
In order to overcome the problem that the efficiency of a ball screw point can only be tested in the prior art, the embodiment provides a transmission efficiency testing system for a large bearing line of the ball screw.
as shown in fig. 2, the test system includes: the device comprises a shell 1, a top cover 10, a screw rod bracket 2, a nut bracket 8, a screw rod shifting fork 11 and an axial force measuring assembly.
The top cover 10 is fixedly installed at the top opening of the casing 1, and the top cover 10 and the casing 1 form a supporting structure of the testing system, and the top cover 10 and the casing 1 together provide an installation interface for installation and fixation of other components.
The ball screw to be tested consists of a screw 6, a nut 7, balls and other parts.
The ball screw to be tested is vertically supported in the shell 1, wherein the upper end of the ball screw 6 is supported in the central hole of the top cover 10 through an upper radial bearing 9; the lower extreme of lead screw 6 passes through thrust bearing 4 and radial bearing 5 supports in the mounting hole that lead screw support 2 corresponds down, sets up bearing cap 3 and carries out axial spacing to thrust bearing 4 and radial bearing 5 down in the mounting hole to the ball that will await measuring supports between top cap 10 and lead screw support 2, and this kind of support mode has formed ball lower extreme fixed stay simultaneously, the upper end configuration of moving about and supporting. The bottom of the screw bracket 2 is fixedly connected with the shell 1. The method for applying the ball screw torque and the testing method are consistent with the loading method and the testing method in the prior art, namely, a mounting hole is formed in the bottom of the shell 1 and corresponds to the screw 6, the screw 6 is loaded with the torque through a screw shifting fork 11 which penetrates through the mounting hole and is connected with the screw 6, and then the torque of the screw 6 is measured through a torque sensor arranged at the tail end of the screw shifting fork 11.
The nut support 8 is fixedly connected with the nut 7, and the combination of the nut support and the nut can move along the axial direction of the screw rod 6. The structure of the nut bracket 8 is as shown in fig. 3, the nut bracket 8 is mainly a circular plate with a central hole, a lug 801 is arranged on the circular plate, and the lug 801 is used for fixing the axial force measuring assembly; on the inner circumferential surface of the housing 1, a slide groove corresponding to the tab 801 is provided as the guide groove 101 in the vertical direction, and as shown in fig. 4, the tab 801 is slidably fitted into the guide groove 101 corresponding thereto and can slide up and down in the guide groove 101.
axial force measuring component sets up between nut support 8 and 1 bottom surface of casing, and measuring component includes: a lower adapter bracket 12, a force sensor 13, a spring lower bracket 14, a spring link 15, a compression spring 16, a spring upper bracket 17, and an upper adapter bracket 18, as shown in fig. 5. The upper spring support 17 and the lower spring support 14 are both of a cylindrical structure with an opening at one end and a shaft shoulder at one end, wherein the shaft shoulder end of the upper spring support 17 is fixedly connected with the upper transfer frame 18, and the upper transfer frame 18 is fixedly connected with the lug plate 801 on the nut support 8; the open end of the lower spring support 14 is coaxially opposite to the open end of the upper spring support 17, the force sensor 13 is arranged between the shaft shoulder end and the lower adapter 12, and the lower adapter 12 is fixedly connected with the shell 1. The middle part of the tubular structure that upper spring support 17 and lower spring support 14 formed is provided with spring connecting rod 15, plays the guide effect to the relative removal of lower spring support 14 of upper spring support 17, specifically is: the center of the inner bottom surface of the lower spring support 14 is provided with a threaded blind hole, the center of the inner bottom surface of the upper spring support 17 and the corresponding position of the upper transfer support 18 are provided with through holes, the lower end of the spring connecting rod 15 is in threaded connection with the threaded blind hole at the center of the lower spring support 14, the upper end of the spring connecting rod passes through the through hole at the center of the upper spring support 17 and then is axially limited through being in threaded connection with a nut, and the spring connecting rod 15 is in sliding fit with the through hole at the center of. The compression spring 16 is sleeved outside a cylindrical structure formed after the upper spring support 17 and the lower spring support 14 are in butt joint, one end of the compression spring 16 is abutted against a shaft shoulder of the upper spring support 17, and the other end of the compression spring is abutted against a shaft shoulder of the lower spring support 14. The compression spring can be a disc spring or other compression springs, and is determined according to the stress form on the tested lead screw.
In order to match the compression stroke of the compression spring 16, four strip-shaped open grooves are uniformly distributed at the open ends of the upper spring support 17 and the lower spring support 14 along the circumferential direction, so that the open ends of the upper spring support 17 and the lower spring support 14 are in a structural form that the strip-shaped open grooves and the strip-shaped bulges are distributed at intervals along the circumferential direction; during installation, the positions of the strip-shaped bulges on the upper spring support 17 correspond to the positions of the strip-shaped opening grooves on the lower spring support 14 one by one, so that when the compression spring 16 is compressed, the upper spring support 17 moves downwards relative to the lower spring support 14 and is matched with the compression of the compression spring 16.
when torque is applied to the screw 6 through the screw shifting fork 11, the nut 7 moves along the axial direction of the screw 6, the nut bracket 8 is driven to move along the guide groove on the shell 1, the compression spring 16 in the measuring assembly is compressed, and then the axial force of the nut 7 is measured through the force sensor 13 in the measuring assembly.
the method for testing the transmission efficiency of the ball screw by adopting the system comprises the following steps:
The efficiency test for measuring the ball screw is usually carried out under the rated load of the screw, and according to a ball screw transmission efficiency formula, the torque T of the screw in the ball screw and the axial force F of the nut need to be measured. The torque T of the screw is measured by a torque sensor, the axial force F of the nut is measured by a force sensor on the axial force measuring component, and the transmission efficiency measured by the system is the linear efficiency of the ball screw in the motion stroke range.
example 2:
On the basis of the embodiment 1, in order to test the transmission efficiency of the ball screw under a large bearing condition, a plurality of groups of axial force measuring assemblies are arranged between the nut bracket 8 and the bottom surface of the shell 1, and the number of the axial force measuring assemblies is n.
therefore, n lugs 801 are uniformly arranged on the nut bracket 8 along the circumferential direction, and each lug 801 corresponds to one axial force measuring assembly; sliding grooves corresponding to the tabs 801 one by one are provided in the vertical direction on the inner circumferential surface of the housing 1 as guide grooves 101, and the tabs 801 are slidably fitted in the corresponding guide grooves 101 and can slide up and down in the guide grooves 101.
the number of the axial force measuring assemblies is the same as that of the lug plates 801 arranged on the nut bracket 8, and the axial force measuring assemblies correspond to the lug plates one by one. And because the measured value of each measuring assembly is strong, the measured value of the force sensor on the ith measuring assembly is Fi, the n of the axial force of the nut is the number of the measuring assemblies in the testing system, and i is 1 … n.
The axial force measuring assemblies are uniformly distributed along the circumferential direction, the distribution number is determined according to the axial bearing capacity on the ball screw, and when the load is large, the distribution number of the axial force measuring assemblies can be increased properly, and 3 groups or 4 groups are preferable. Taking a three-fulcrum ball screw transmission efficiency test system as an example: namely, three groups of measuring components between the nut bracket 8 and the shell 1 are uniformly distributed along the circumferential direction, three lugs 801 are uniformly distributed on the corresponding nut bracket 8 in the circumferential direction, and three guide grooves 101 are uniformly distributed on the shell 1 in the circumferential direction.
When the axial force measuring assembly is designed, because the linear transmission efficiency with the stroke of L0 needs to be measured under the rated torque T0 of the screw rod, the axial force F0 corresponding to the rated torque T0 is divided into three parts, the compression stroke LD of each group of compression springs is not less than L0 when the axial force borne by each measuring assembly is designed, and the matching length LK of the strip-shaped groove on the upper spring support 17 and the strip-shaped protrusion on the lower spring support 14 is not less than LD (namely, the displacement LK of the upper spring support 17 relative to the lower spring support 14 is not less than LD).
each axial force measuring assembly is designed according to the axial force stroke LD during design, the number of the compression springs and the installation form of the compression springs are conventional in the field, and the design implementation can be referred to GB/T1972-. The design force value of each set of compression spring assemblies can be reduced by increasing the number of anchors (i.e., the number of measurement assemblies) when the axial load F is greater.
meanwhile, the compression stroke of the compression spring in the axial force measuring assembly is related to the linear stroke of the tested ball screw, and the ball screw testing piece with different linear strokes can be adapted by changing the combination form of the compression spring and the rigidity of the compression spring.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A ball screw drive efficiency test system, comprising: the device comprises a shell, a screw rod support (2), a nut support (8), a screw rod shifting fork (11) and an axial force measuring assembly, wherein the screw rod support, the nut support (8), the screw rod shifting fork (11) and the axial force measuring assembly are arranged in the shell;
The ball screw to be tested comprises a screw rod (6) and a nut (7);
a ball screw to be tested is supported inside the shell; the screw rod shifting fork (11) connected with the screw rod (6) is used for applying torque to the screw rod (6), and the torque sensor arranged at the tail end of the screw rod shifting fork (11) is used for measuring the actual torque value of the screw rod (6);
The nut support (8) is fixedly connected with the nut (7), and the nut support (8) is in sliding fit with the inner surface of the shell, so that the nut support (8) and the nut (7) can move together along the axial direction of the lead screw (6);
the axial force measuring assembly is arranged between the nut support (8) and the bottom surface of the shell and used for measuring the axial force of the ball screw to be tested.
2. The ball screw drive efficiency testing system of claim 1, wherein: n axial force measuring assemblies are uniformly distributed between the nut support (8) and the bottom surface of the shell along the circumferential direction, n is an integer greater than or equal to 2, the measured value of the ith axial force measuring assembly is Fi, and the axial force of the ball screw to be tested is measured
3. The ball screw transmission efficiency testing system according to claim 1 or 2, characterized in that: the axial force measurement assembly includes: the device comprises a lower adapter rack (12), a force sensor (13), a lower spring bracket (14), a compression spring (16), an upper spring bracket (17) and an upper adapter rack (18);
the upper spring support (17) and the lower spring support (14) are coaxially butted to form a cylindrical structure, and the upper spring support (17) can move along the axial direction of the lower spring support (14) relative to the lower spring support; the compression spring (16) is sleeved outside a cylindrical structure formed by butting the upper spring support (17) and the lower spring support (14), one end of the compression spring (16) is abutted against a shaft shoulder at the end part of the upper spring support (17), and the other end of the compression spring is abutted against a shaft shoulder at the end part of the lower spring support (14);
The upper spring bracket (17) is fixedly connected with the nut bracket (8) through an upper adapter bracket (18); the lower spring support (14) is opposite to the lower adapter (12), and a force sensor (13) is arranged between contact surfaces; the lower adapter rack (12) is fixedly connected with the shell;
and the measuring stroke of the ball screw to be tested is L0, and the compression stroke LD of the compression spring (16) is more than or equal to L0.
4. the ball screw drive efficiency testing system of claim 3, wherein: the upper spring support (17) and the lower spring support (14) are both of a cylindrical structure with one end opened and one end provided with a shaft shoulder; when in butt joint, the open ends of the upper spring bracket (17) and the lower spring bracket (14) are opposite; a spring connecting rod (15) is arranged in the middle of a cylindrical structure formed by the upper spring support (17) and the lower spring support (14); one end of the spring connecting rod (15) is in threaded connection with the lower spring support (14), the other end of the spring connecting rod penetrates through a through hole in the center of the upper spring support (17) and then is axially limited through a nut, and the spring connecting rod (15) is in sliding fit with the through hole in the center of the upper spring support (17);
more than two strip-shaped open grooves are uniformly distributed at the open ends of the upper spring support (17) and the lower spring support (14) along the circumferential direction, so that the open ends of the upper spring support (17) and the lower spring support (14) are in a structural form that the strip-shaped open grooves and the strip-shaped bulges are distributed at intervals along the circumferential direction; during installation, the positions of the strip-shaped opening grooves on the upper spring support (17) correspond to the positions of the strip-shaped bulges on the lower spring support (14) one by one, so that the upper spring support (17) can move relative to the lower spring support (14) when the compression spring (16) is compressed;
The matching length LK between the strip-shaped open slot on the disc spring upper support (17) and the strip-shaped bulge on the disc spring lower support (14) is larger than or equal to LD.
5. the ball screw transmission efficiency testing system according to claim 1 or 2, characterized in that: the nut bracket (8) is a circular plate with a central hole, and lugs 801 which are in one-to-one correspondence with the axial force measuring assemblies are arranged on the circular plate along the circumferential direction; sliding grooves which are in one-to-one correspondence with the lugs (801) are arranged on the inner circumferential surface of the shell (1) along the vertical direction and serve as guide grooves (101), and the lugs (801) are in sliding fit with the corresponding guide grooves (101).
6. The ball screw transmission efficiency testing system according to claim 1 or 2, characterized in that: in the ball screw to be tested, the upper end of a screw (6) is supported on a shell through an upper radial bearing (9); the lower end of the screw rod (6) is supported on the screw rod bracket (2) through a thrust bearing (4) and a lower radial bearing (5), and the screw rod bracket (2) is fixedly connected with the shell.
7. The ball screw transmission efficiency testing system according to claim 1 or 2, characterized in that: the housing includes: the testing system comprises a shell (1) and a top cover (10), wherein the top cover (10) is fixedly installed at the opening at the top of the shell (1), and the top cover (10) and the shell (1) form a supporting structure of the testing system.
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| CN201910751887.0A CN110542501B (en) | 2019-08-15 | 2019-08-15 | Ball screw transmission efficiency test system |
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| CN201910751887.0A CN110542501B (en) | 2019-08-15 | 2019-08-15 | Ball screw transmission efficiency test system |
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| US5207092A (en) * | 1991-04-10 | 1993-05-04 | Dana Corporation | Apparatus for spin checking clutch driven disc assemblies |
| JP2013164386A (en) * | 2012-02-13 | 2013-08-22 | Nsk Ltd | Ball screw abnormality diagnostic device and ball screw abnormality diagnostic method |
| CN107515117A (en) * | 2017-09-25 | 2017-12-26 | 山东博特精工股份有限公司 | Lead screw pair transmission efficiency precision measurement apparatus and measuring method |
| CN207366204U (en) * | 2017-09-26 | 2018-05-15 | 无锡双益精密机械有限公司 | A kind of efficiency detection device for ball screw assembly, |
| CN109100139A (en) * | 2018-08-25 | 2018-12-28 | 南京理工大学 | A kind of lead screw pair transmission efficiency dynamic measurement device and its measurement method |
| CN109357798A (en) * | 2018-10-30 | 2019-02-19 | 中国北方发动机研究所(天津) | A kind of turbocharger axial direction power test structure |
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2019
- 2019-08-15 CN CN201910751887.0A patent/CN110542501B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5207092A (en) * | 1991-04-10 | 1993-05-04 | Dana Corporation | Apparatus for spin checking clutch driven disc assemblies |
| JP2013164386A (en) * | 2012-02-13 | 2013-08-22 | Nsk Ltd | Ball screw abnormality diagnostic device and ball screw abnormality diagnostic method |
| CN107515117A (en) * | 2017-09-25 | 2017-12-26 | 山东博特精工股份有限公司 | Lead screw pair transmission efficiency precision measurement apparatus and measuring method |
| CN207366204U (en) * | 2017-09-26 | 2018-05-15 | 无锡双益精密机械有限公司 | A kind of efficiency detection device for ball screw assembly, |
| CN109100139A (en) * | 2018-08-25 | 2018-12-28 | 南京理工大学 | A kind of lead screw pair transmission efficiency dynamic measurement device and its measurement method |
| CN109357798A (en) * | 2018-10-30 | 2019-02-19 | 中国北方发动机研究所(天津) | A kind of turbocharger axial direction power test structure |
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