CN112096561A - Take lightweight integrated motor of orifice - Google Patents
Take lightweight integrated motor of orifice Download PDFInfo
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- CN112096561A CN112096561A CN202010970936.2A CN202010970936A CN112096561A CN 112096561 A CN112096561 A CN 112096561A CN 202010970936 A CN202010970936 A CN 202010970936A CN 112096561 A CN112096561 A CN 112096561A
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- hole
- oil
- valve body
- shell
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C2/00—Rotary-piston engines
- F03C2/08—Rotary-piston engines of intermeshing-engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
The invention discloses a light-weight integrated motor with a throttling hole, which comprises a shell, a front cover detachably connected to the front end of the shell, a valve body detachably connected to the rear end of the shell, and a driving gear and a driven gear which are arranged in the shell, wherein the front cover is connected to the front end of the shell; the valve body is provided with an oil inlet cavity channel, an oil outlet cavity channel, an oil inlet hole, a throttling hole and an electromagnetic valve mounting hole; one end of the throttling hole is communicated with the oil outlet cavity channel, the other end of the throttling hole is communicated with the shell, one end of the oil inlet hole is communicated with the electromagnetic valve mounting hole, the other end of the oil inlet hole is communicated with the shell, the electromagnetic valve mounting hole is communicated with the oil inlet cavity channel and the oil outlet cavity channel, and an electromagnetic valve is mounted in the electromagnetic valve mounting hole. The invention has good integration performance and can improve the cleanliness of products; a direct-acting air suction prevention overflow valve is integrated in the valve body to prevent the generation of an air column in a pipeline; the throttle hole is integrated in the valve body, and the motor can be stopped quickly after the electromagnetic valve is inserted.
Description
Technical Field
The invention relates to the field of integrated motors of engineering machinery, in particular to a light-weight integrated motor with a throttling hole.
Background
The gear motor of the integrated gear motor is used as an actuating element of a hydraulic system, has the characteristics of simple structure, small volume, light weight, insensitivity to oil pollution and the like, and is widely used in refrigeration air-conditioning systems of hydraulic cranes and various hydraulic devices. The existing integrated gear motor structure which needs to drive the compressor has the following problems:
1. the existing domestic integrated motor has low cleanliness and is easy to have the fault phenomena of valve clamping and the like.
2. Most of the existing integrated valve blocks are steel parts, and although the rigidity is good, the self weight is heavier.
3. The existing integrated motor is operated after being stopped for a long time, and an air column can be formed in a hydraulic pipeline to damage a hydraulic system.
4. After the hydraulic source is cut off, the integrated motor for driving the cooling fan has longer downtime.
5. The integrated motor works for a long time under the working condition of non-working requirement, which causes the waste of energy.
Disclosure of Invention
The invention aims to solve the technical problem of providing a light-weight integrated motor with a throttling hole, which can stop rotating quickly, save energy and reduce consumption.
In order to solve the technical problems, the invention adopts the following technical scheme: a light-weight integrated motor with a throttling hole comprises a shell, a front cover detachably connected to the front end of the shell, a valve body detachably connected to the rear end of the shell, and a driving gear and a driven gear which are installed in the shell; the method is characterized in that: the valve body is provided with an oil inlet cavity channel, an oil outlet cavity channel, an oil inlet hole, a throttling hole and an electromagnetic valve mounting hole;
one end of the throttling hole is communicated with the oil outlet cavity channel, the other end of the throttling hole is communicated with the shell, one end of the oil inlet hole is communicated with the electromagnetic valve mounting hole, the other end of the oil inlet hole is communicated with the shell, the electromagnetic valve mounting hole is communicated with the oil inlet cavity channel and the oil outlet cavity channel, and an electromagnetic valve is mounted in the electromagnetic valve mounting hole.
Furthermore, the tail end of the oil inlet cavity channel is communicated with the tail end of the oil outlet cavity channel through a transition cavity channel arranged on the valve body, an overflow valve mounting hole is further formed in the valve body and communicated with the tail end of the oil inlet cavity channel, and an overflow valve is mounted in the overflow valve mounting hole.
Further, the overflow valve is a direct-acting anti-air-suction overflow valve.
Further, the electromagnetic valve is a normally open type or a normally closed type two-dimensional four-way valve.
Furthermore, the oil inlet cavity channel and the oil outlet cavity channel extend inwards from the upper end surface of the valve body, the electromagnetic valve mounting hole extends inwards from the side surface of the valve body, and the overflow valve mounting hole extends inwards from the lower end surface of the valve body.
Furthermore, an oil drainage cavity channel communicated with the shell is formed in the valve body.
Further, it has the shaft hole to open on the protecgulum, be fixed with driving gear axle on the driving gear, the front end of driving gear axle passes the shaft hole, the pore wall in shaft hole with install deep groove ball bearing and lip oil blanket between the driving gear axle, just the lip oil blanket is located deep groove ball bearing's the outside.
Furthermore, an oil return hole is formed in the front cover, one end of the oil return hole is communicated with the shell, and the other end of the oil return hole is communicated with the shaft hole and is located on the inner side of the deep groove ball bearing.
Further, the front cover, the housing and the valve body are pre-tightened by a plurality of screws which penetrate through the front cover and the housing and are screwed into the valve body.
Furthermore, the wall thickness of the valve body is 60mm, and the material is ZL111(T6) cast aluminum alloy.
The invention has the beneficial effects that:
the invention can further reduce the installation space of the gear motor, the valve block and the pipeline, and has good integration performance; the split design of the shell and the valve body can be used for separately carrying out the test, so that the cleanliness of the product is further improved; a direct-acting air suction prevention overflow valve is integrated in the valve body, so that an air column can be prevented from being generated in a pipeline; a throttle hole is integrated in the valve body, and the motor can be stopped quickly after the electromagnetic valve is inserted; the gear motor can be controlled to work or not by switching on and off the electromagnetic valve, so that energy is saved and consumption is reduced.
Drawings
Fig. 1 is a schematic perspective view of an embodiment of the present invention.
Fig. 2 is a front view of fig. 1.
Fig. 3 is a cross-sectional view of fig. 1.
Fig. 4 is a perspective view of the valve body of fig. 1.
Fig. 5 is a top view of fig. 4.
Fig. 6 is a front view of fig. 4.
Fig. 7 is a sectional view taken along line a-a of fig. 5.
Fig. 8 is a sectional view taken along line B-B of fig. 6.
The components in the drawings are labeled as follows:
the oil-leakage-prevention type hydraulic control valve comprises a front cover 1, an 11-shaft hole, 12-oil return holes, 13 screws, 14 deep groove ball bearings, 15 double-lip oil seals, a 2-shell body, a 3-valve body, a 31-oil-inlet cavity channel, a 32-oil-outlet cavity channel, a 33-oil inlet hole, a 34-throttling hole, a 35-electromagnetic-valve mounting hole, a 36-transition cavity channel, a 37-overflow-valve mounting hole, a 38-oil-drainage cavity channel, a 39-shaft abdicating hole, a 4-driving gear, a 41-driving-gear shaft, a 5-driven gear, a 51-driven-gear shaft, a 6-electromagnetic valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The embodiments and features of the embodiments in the present application may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, "a plurality" means two or more. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
See fig. 1-8.
The invention relates to a light-weight integrated motor with a throttling hole, which comprises a shell 2, a front cover 1 detachably connected to the front end of the shell 2, a valve body 3 detachably connected to the rear end of the shell 2, and a driving gear 4 and a driven gear 5 which are arranged in the shell 2; the method is characterized in that: the valve body 3 is provided with an oil inlet cavity channel 31, an oil outlet cavity channel 32, an oil inlet hole 33, a throttling hole 34 and an electromagnetic valve mounting hole 35;
one end of the throttle hole 34 is communicated with the oil outlet channel 32, the other end is communicated with the housing 2, one end of the oil inlet hole 33 is communicated with the solenoid valve mounting hole 35, the other end is communicated with the housing 2, the solenoid valve mounting hole 35 is communicated with both the oil inlet channel 31 and the oil outlet channel 32, a solenoid valve 6 is mounted in the solenoid valve mounting hole 35, and preferably, the solenoid valve 6 is a normally open or normally closed two-dimensional four-way valve;
preferably, the tail end of the oil inlet cavity channel 31 is communicated with the tail end of the oil outlet cavity channel 32 through a transition cavity channel 36 formed in the valve body 3, an overflow valve mounting hole 37 is further formed in the valve body 3, the overflow valve mounting hole 37 is communicated with the tail end of the oil inlet cavity channel 31, an overflow valve 7 is mounted in the overflow valve mounting hole 37, and preferably, the overflow valve 7 is a direct-acting overflow valve.
The control mode of the invention takes a normally open type electromagnetic valve as an example:
a. when not electrified, the electromagnetic valve is normally opened, and the flow direction of hydraulic oil is as follows: the oil inlet cavity → the electromagnetic valve → the oil outlet cavity, the motor does not work, the consumption is reduced, and the energy is saved;
b. the solenoid valve is closed after circular telegram, and hydraulic oil no longer passes through the solenoid valve, and hydraulic oil flow direction: the oil inlet cavity → the shell → the throttling hole → the oil outlet cavity, the hydraulic energy is converted into mechanical energy, and the motor works normally;
c. the solenoid valve is closed after circular telegram, and when motor oil inlet pressure was greater than the required pressure of system, the work was intervene to the overflow valve (this moment because of the flow increase, integrated motor speed accelerates), hydraulic oil flow direction: the oil inlet channel → the shell → the overflow valve hole → the transition channel → the oil outlet channel, the integrated motor is unloaded, and when the flow is reduced to the system requirement, the overflow valve is closed.
Namely, the electromagnetic valve and the overflow valve are respectively connected with the main loop of the system in parallel to realize the corresponding functions.
When the compressor air conditioner is driven by the integrated motor, the starting speed and the stopping speed are ideal because the load torque is small and the rotational inertia is small; when the integrated motor drives the cooling fan, because the shape and the mass distribution of the cooling fan are different from those of a compressor, the diameter of a fan blade is large, and the mass is heavy, so that the load torque of the actual work is large, the rotational inertia is also large, when the integrated motor does not work, the stop time of the cooling fan is long, the internal hydraulic source of the gear motor is cut off at the moment, the full oil film lubrication is converted into the half oil film lubrication between the internal friction pairs of the motor, the rapid abrasion between the internal friction pairs can be caused, and the service life of the integrated motor is shortened. The throttle hole is arranged at the oil circuit of the outlet of the motor, so that the integrated motor executing element can generate a back pressure value, and after the integrated motor is stopped, the back pressure of the oil return circuit can effectively reduce the stop time of the integrated motor by more than 30%; when the integrated motor is restarted after long-time shutdown, the back pressure exists, so that the damping effect can be achieved, and the stability is good when the integrated motor is started to run at the rated rotating speed.
The integrated motor is generally far away from a hydraulic source, the installation height of the integrated motor is higher than that of the hydraulic source, after the hydraulic system stops working for a long time, if an oil return oil path does not have a check valve for sealing oil, hydraulic oil in the pipeline slowly flows back to an oil tank under the action of gravity, a large amount of gas enters a pipeline after the oil flows away, and a gas column phenomenon in the pipeline of the system is formed. The anti-air-suction overflow valve is arranged, when the load pressure of the system reaches a certain value, the overflow valve is opened to work, the parallel overflow type pressure regulating function (P load pressure is Q flow and Z hydraulic impedance) of the quantitative system is realized, the purpose of regulating the load pressure is realized, the safety protection function is provided for a valve block loop, the reverse one-way valve has the anti-air-suction function, and the gas is prevented from entering a hydraulic pipeline (excessive gas can form a gas column in the pipeline, and the gas column can cause the phenomena of creeping and shaking when an execution element is restarted).
In addition, the integrated motor is designed to be of a three-section structure comprising the front cover, the shell and the valve body, so that the cleanliness of the integrated motor can be greatly improved.
In specific implementation, in order to form the transition channel 36 and the orifice 34, a first process hole 361 and a second process hole 341 are formed inwards from the surface of the valve body, the second process hole 341 is communicated with the oil outlet channel 32, then the transition channel 36 and the orifice 34 are opened based on the first process hole 361 and the second process hole 341, and then a first plug 9 and a second plug 10 are respectively installed in the first process hole 361 and the second process hole 341 to plug.
The diameter of the throttling hole is smaller than that of the oil outlet cavity channel, and preferably the diameter phi of the throttling hole is 4 mm. In practice, the inventors have found that the orifice diameter is designed to be 4mm, which produces a better back pressure effect.
In one embodiment, the oil inlet channel 31 and the oil outlet channel 32 extend inward from the upper end surface of the valve body 3, the solenoid valve mounting hole 35 extends inward from the side surface of the valve body 3, and the relief valve mounting hole 37 extends inward from the lower end surface of the valve body 3. The design like this, it is rational in infrastructure, each oil circuit distributes rationally, and processing is convenient, and is little to the intensity influence of valve body.
In an embodiment, a driving gear shaft 41 is fixed on the driving gear 4, a driven gear shaft 51 is fixed on the driven gear 5, and shaft relief holes 39 are respectively formed in positions of the front end surface of the valve body 3 corresponding to the driving gear shaft 41 and the driven gear shaft 51, so as to prevent each gear shaft and the valve body from colliding.
In an embodiment, the valve body 3 is further provided with a drain cavity 38 communicated with the housing 2. The oil drainage cavity is used for guiding oil leaked from the interior of the shell to the oil return tank.
In an embodiment, the front cover 1 is provided with a shaft hole 11, the front end of the driving gear shaft 41 penetrates through the shaft hole 11, a deep groove ball bearing 14 and a double-lip oil seal 15 are installed between the hole wall of the shaft hole 11 and the driving gear shaft 41, and the double-lip oil seal 15 is located outside the deep groove ball bearing 14. By the design, the arranged double-lip oil seal is used for preventing dust outwards and preventing hydraulic oil from leaking inwards; because the torque required by the compressor of the automobile crane refrigeration air-conditioning system is small (Tmax is less than 20 N.m), the deep groove ball bearing is arranged in the front cover and can bear certain radial force, the motor does not need to be made into a transition cover structure (namely the front cover, the transition cover, the shell and the valve body structure), the whole weight of the motor is reduced, and the installation space is saved.
In an embodiment, an oil return hole 12 is formed in the front cover 1, and one end of the oil return hole 12 is communicated with the housing 2, and the other end is communicated with the shaft hole 11 and is located inside the deep groove ball bearing. Because the gear motor is of a bidirectional structure, the oil return hole is formed in the inner side of the deep groove ball bearing, hydraulic oil flows to the oil drain port from the oil return hole, residual oil with sub-high pressure and high temperature is taken away, the pressure safety value of the inner lip of the double-lip oil seal is maintained, and in specific implementation, the pressure-resistant limit value of the lip of the double-lip oil seal is 10 bar.
Preferably, a through hole 511 is formed in the driven gear shaft 51, one end of the oil return hole 12 is communicated with the corresponding position of the driven gear 5 of the shell 2, so that the through hole 511 is communicated with the oil return hole 12, and the front end of the oil drainage cavity channel 38 is communicated with the corresponding shaft yielding hole 39 of the driven gear shaft 51, so that the oil drainage cavity channel 38 is communicated with the through hole 511. The oil return hole is formed in the driven gear, and firstly, compared with the solid gear, the hollow gear with the through hole is better than the solid gear in rigidity under the same size, and the radial deformation resistance is better when the hollow gear is meshed; and secondly, the reasonable hollow shaft design with the through hole can save materials to a certain extent, the weight of parts is reduced, when the through hole is connected with the oil drainage cavity in a linear mode, the length of the oil return cavity is reduced, the oil drainage channel with a larger angle is also avoided, and the back pressure value at the oil outlet of the system is reduced.
In one embodiment, floating compensation bushings 8 are respectively sleeved on the front side and the rear side of the driving gear shaft 41 and the driven gear shaft 51, and are respectively positioned on the driving gear and the driven gear. According to the formula F of the hydraulic thrust on the front and back sides of the shaft sleeveFront hydraulic pressure<(FReverse hydraulic thrust+FElastic force of elastic body) And the floating compensation shaft sleeve is tightly attached to the end face of the gear, so that the motor can be ensured to have high volume efficiency for a long time.
In one embodiment, the front cover 1, the housing 2 and the valve body 3 are prestressed by means of a plurality of screws 13 which pass through the front cover 1 and the housing 2 and are screwed into the valve body 3. The design like this, simple structure, easy preparation and installation, because of the internal thread depth is less and need not to run through the valve body, consequently valve body inner structure can arrange in a flexible way, and the preparation requires lowly.
In one embodiment, the wall thickness of the valve body 3 is 60mm, and the material is ZL111T6 cast aluminum alloy. The valve body of the Italy CASAPA series integrated motor is about 75mm in thickness, and domestic enterprises mostly choose medium carbon steel to process the valve block, so the easy purchase and the low price are main reasons. The thickness of the valve body is further reduced to 60mm, the valve body is made of ZL111(T6) cast aluminum alloy, the tensile strength is high and reaches 315MPa, and the weight is light. Compared with a conventional steel valve body, the weight of the system valve is reduced, the weight is only 30% of that of the original piece, and the light weight of the system is realized.
The driving gear and the driven gear of the gear motor and the arrangement of the friction pair thereof, the arrangement of the sealing ring groove, the lubricating and heat dissipating groove and other structures are the prior art, the principle and the structure are known to those skilled in the art and experts, and for the sake of brevity, the related technical content in the integrated motor structure is not shown in detail.
The oil circuit system is designed, the quantity of pipe joints and oil pipes in an engineering mechanical system is greatly reduced, the integral integration is strong, the structure of the system is more compact, and the leakage link of the system is reduced.
The light-weight integrated motor with the throttling hole can be used in automobile hydraulic cranes, refrigeration air-conditioning systems of various hydraulic equipment and small and medium-sized cooling fans of various hydraulic engineering machinery, and takes a driving compressor as an example.
According to the integrated motor, the shell 2 and the valve body 3 are made into a two-section type structure instead of an integral type structure, the internal structure of the shell 2 is simple, aluminum scraps are easy to clean, the internal cavity of the valve body 3 is complex, and the aluminum scraps are difficult to completely clean.
It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this disclosure.
Claims (10)
1. A light-weight integrated motor with a throttling hole comprises a shell (2), a front cover (1) detachably connected to the front end of the shell (2), a valve body (3) detachably connected to the rear end of the shell (2), and a driving gear (4) and a driven gear (5) which are installed in the shell (2); the method is characterized in that: an oil inlet cavity channel (31), an oil outlet cavity channel (32), an oil inlet hole (33), an orifice (34) and an electromagnetic valve mounting hole (35) are formed in the valve body (3);
the one end of orifice (34) with oil outlet channel (32) intercommunication, the other end with casing (2) intercommunication, the one end of inlet port (33) with solenoid valve mounting hole (35) intercommunication, the other end with casing (2) intercommunication, solenoid valve mounting hole (35) with oil inlet channel (31) with oil outlet channel (32) all communicates, install solenoid valve (6) in solenoid valve mounting hole (35).
2. The throttle-equipped, lightweight integrated motor according to claim 1, wherein: the tail end of the oil inlet cavity channel (31) is communicated with the tail end of the oil outlet cavity channel (32) through a transition cavity channel (36) formed in the valve body (3), an overflow valve mounting hole (37) is further formed in the valve body (3), the overflow valve mounting hole (37) is communicated with the tail end of the oil inlet cavity channel (31), and an overflow valve (7) is mounted in the overflow valve mounting hole (37).
3. The throttle-equipped, lightweight integrated motor according to claim 2, wherein: the overflow valve (7) is a direct-acting anti-air-suction overflow valve (7).
4. The throttle-hole, lightweight, integrated motor according to claim 2 or 3, wherein: the electromagnetic valve (6) is a normally open type or a normally closed type two-dimensional four-way valve.
5. The throttle-hole, lightweight, integrated motor according to claim 2 or 3, wherein: the oil inlet cavity channel (31) and the oil outlet cavity channel (32) extend inwards from the upper end surface of the valve body (3), the electromagnetic valve mounting hole (35) extends inwards from the side surface of the valve body (3), and the overflow valve mounting hole (37) extends inwards from the lower end surface of the valve body (3).
6. The throttle-hole, lightweight, integrated motor according to claim 1, 2 or 3, wherein: and an oil drainage cavity (38) communicated with the shell (2) is also formed in the valve body (3).
7. The throttle-hole, lightweight, integrated motor according to claim 1, 2 or 3, wherein: open on protecgulum (1) has shaft hole (11), be fixed with driving gear axle (41) on driving gear (4), the front end of driving gear axle (41) passes shaft hole (11), the pore wall in shaft hole (11) with install deep groove ball bearing (14) and lip oil blanket (15) between driving gear axle (41), just lip oil blanket (15) are located the outside of deep groove ball bearing (14).
8. The throttle-equipped, lightweight integrated motor according to claim 7, wherein: an oil return hole (12) is formed in the front cover (1), one end of the oil return hole (12) is communicated with the shell (2), and the other end of the oil return hole is communicated with the shaft hole (11) and is located on the inner side of the deep groove ball bearing (14).
9. The throttle-hole, lightweight, integrated motor according to claim 1, 2 or 3, wherein: the front cover (1), the shell (2) and the valve body (3) are pre-tightened through a plurality of screws (13) which penetrate through the front cover (1) and the shell (2) and are screwed into the valve body (3) in a threaded mode.
10. The throttle-hole, lightweight, integrated motor according to claim 1, 2 or 3, wherein: the wall thickness of the valve body (3) is 60mm, and the material is ZL111(T6) cast aluminum alloy.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010970936.2A CN112096561A (en) | 2020-09-16 | 2020-09-16 | Take lightweight integrated motor of orifice |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010970936.2A CN112096561A (en) | 2020-09-16 | 2020-09-16 | Take lightweight integrated motor of orifice |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112594124A (en) * | 2021-01-27 | 2021-04-02 | 合肥皖液液压元件有限公司 | Novel integrated motor with automatic unloading function of overload |
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2020
- 2020-09-16 CN CN202010970936.2A patent/CN112096561A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112594124A (en) * | 2021-01-27 | 2021-04-02 | 合肥皖液液压元件有限公司 | Novel integrated motor with automatic unloading function of overload |
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