CN103397993B - A kind of cam pump - Google Patents
A kind of cam pump Download PDFInfo
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- CN103397993B CN103397993B CN201310344493.6A CN201310344493A CN103397993B CN 103397993 B CN103397993 B CN 103397993B CN 201310344493 A CN201310344493 A CN 201310344493A CN 103397993 B CN103397993 B CN 103397993B
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Abstract
The present invention relates to a kind of cam pump, comprise plunger system and cylinder body, also comprise: cylindrical cam, its end face has the curved profile comprising multiple profile region, each described profile region comprises oil suction district and laminated oil zone; Wherein, described plunger system comprises at least one plunger rod and at least one roller, is provided with at least one oil cylinder in described cylinder body; At least one roller described contacts with described curved profile, and drives described at least one plunger rod to-and-fro motion at least one oil cylinder described.According to technological scheme of the present invention, drive the to-and-fro motion at least one oil cylinder of at least one plunger rod by the curved profile of cylindrical cam, achieve repeatedly oil suction and the force feed process of cam pump.Comparatively speaking, the main shaft of existing pump rotates once, and oil pressure chamber can only complete the process of an oil suction and force feed.Under the condition in the oil pressure chamber of same volume, cam pump delivery provided by the invention is larger.
Description
Technical field
The present invention relates to oil hydraulic pump field, especially relate to a kind of cam pump.
Background technique
At present, existing oil hydraulic pump mainly comprises plunger pump, vane pump and gear pump.The swash plate of plunger pump rotates a circle, and each plunger can only to-and-fro motion stroke, which limits the raising of pump displacement.Vane pump and gear pump delivery are general all smaller, and for vane pump, adding huge discharge must increase length of blade, but lengthened vanes just easily fractures; Gear pump is the engagement squeezed fluid force feed between roller tooth, and the space formed because of gear teeth meshing is very little, and the very difficult space effectively increasing gear teeth meshing and formed, so gear pump delivery is very little, and be difficult to be greatly improved.
In order to be applicable to present large-flow hydraulic system, the even multiple oil hydraulic pump of installation two of just having to, to increase discharge capacity, this adds increased cost, increases the volume of pumping system.Therefore, be necessary that the above-mentioned defect for existing in prior art is improved.
Summary of the invention
Main purpose of the present invention is to provide a kind of cam pump, and it has the structure of improvement, can increase pump delivery.
To achieve these goals, according to an aspect of the present invention, a kind of cam pump is provided, comprise plunger system and cylinder body, described cam pump also comprises: cylindrical cam, its end face has the curved profile comprising multiple profile region, and each described profile region comprises oil suction district and laminated oil zone; Wherein, described plunger system comprises at least one plunger rod and at least one roller, is provided with at least one oil cylinder in described cylinder body; At least one roller described contacts with described curved profile, and drives described at least one plunger rod to-and-fro motion at least one oil cylinder described.
Further, plunger system comprises multiple plunger rod and corresponding multiple roller; The multiple oil cylinders corresponding with multiple plunger rod are provided with in cylinder body; Multiple profile region and multiple pair of rollers should.
Further, cam pump also comprises multiple spring, and multiple spring is arranged in corresponding multiple oil cylinders.
Further, plunger system comprises: the first baffle plate, allows multiple plunger rod to pass through, and limits the position of multiple oil cylinder; Positive stop lug boss, allows multiple plunger rod to pass through, and prevents multiple plunger rod run-off the straight.
Further, multiple profile region is evenly distributed on the end face of cylindrical cam.
Further, multiple roller is in the sustained height on the end face of cylindrical cam.
Further, multiple roller is divided into two groups, and wherein, first group is in the first height on the end face of cylindrical cam, and second group is in the second height on the end face of cylindrical cam.
Further, cam pump also comprises: action system, and it is for changing the position of cylinder body relative to multiple plunger rod, to change the volume in the oil pressure chamber of multiple oil cylinder.
Further, the volume in the oil pressure chamber of the multiple oil cylinder of action system periodic variation.
Further, action system comprises: actuating strut, is connected to cylinder body; Housing, its position immobilizes; Coil, is arranged on housing; Regulator, is electrically connected with coil, and provides alternating current for coil; Electromagnet, is arranged on actuating strut, and is in the alternating magnetic field of electromagnet generation.
Further, actuating strut is connected on cylinder body by otic placode.
Further, housing is cylindric, and coil is arranged on the internal surface of housing, actuating strut be arranged in housing at least partially, electromagnet is arranged at the middle and upper part of actuating strut.
Further, action system also comprises the second baffle of the bottom being arranged at housing, and second baffle allows actuating strut to extend there through, and prevents actuating strut run-off the straight.
Further, regulator also comprises induction conversion equipment, the pressure of the output fluid of this induction conversion equipment induction cam pump, and calculate the comparative result of this pressure and preset pressure value, the amplitude of the alternating current that regulator exports is changed according to this comparative result, to change cam pump delivery, thus ensure that the pressure of the output fluid of cam pump remains unchanged.
According to technological scheme of the present invention, drive the to-and-fro motion at least one oil cylinder of at least one plunger rod by the curved profile of cylindrical cam, achieve repeatedly oil suction and the force feed process of cam pump.Comparatively speaking, the main shaft of existing pump rotates once, and oil pressure chamber can only complete the process of an oil suction and force feed.Under the condition in the oil pressure chamber of same volume, cam pump delivery provided by the invention is larger.
Accompanying drawing explanation
Figure of description is used to provide a further understanding of the present invention, forms a part of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the cam pump according to the embodiment of the present invention one;
Fig. 2 is the partial cutaway schematic of the cylindrical cam according to the embodiment of the present invention one;
Fig. 3 is the schematic diagram of the cam profile according to the embodiment of the present invention one;
Fig. 4 is the schematic diagram of the cam profile according to the embodiment of the present invention one, illustrated therein is the position of roller;
Fig. 5 is each cylinder efficient schematic diagram according to the embodiment of the present invention one;
Fig. 6 is the schematic diagram of the another kind of cam profile according to the embodiment of the present invention one;
Fig. 7 is the schematic diagram of another cam profile according to the embodiment of the present invention one;
Fig. 8 is the structural representation of the cam pump according to the embodiment of the present invention two;
Fig. 9 is the fundamental diagram according to the embodiment of the present invention two.
Embodiment
It should be noted that, when not clearly limit or when not conflicting, the feature in each embodiment of the present invention can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
In order to overcome the defect of oil hydraulic pump of the prior art, the invention provides a kind of cam pump, comprise plunger system and cylinder body, also comprise: cylindrical cam, its end face has the curved profile comprising multiple profile region, each described profile region comprises oil suction district and laminated oil zone; Wherein, described plunger system comprises at least one plunger rod and at least one roller, is provided with at least one oil cylinder in described cylinder body; At least one roller described contacts with described curved profile, and drives described at least one plunger rod to-and-fro motion at least one oil cylinder described.
According to such structure, when transmission main shaft rotates a circle, drive the to-and-fro motion at least one oil cylinder of at least one plunger rod by the curved profile of cylindrical cam, achieve repeatedly oil suction and the force feed process of cam pump.Comparatively speaking, the main shaft of existing pump rotates once, and oil pressure chamber can only complete the process of an oil suction and force feed.Under the condition in the oil pressure chamber of same volume, cam pump delivery provided by the invention is larger.In addition, this cam pump is while realizing huge discharge, and do not increase the volume of pump significantly, structure is also relatively simple.
Fig. 1 is the structural representation of the cam pump according to the embodiment of the present invention one.As shown in Figure 1, the cam pump that the embodiment of the present invention one provides, comprises cylindrical cam 10, cylinder body 20 and plunger system.Plunger system comprises plunger rod 30, bearing pin 31 and roller 32.In fact there are four equally distributed plunger rods and corresponding four rolling in this embodiment, three plunger rods wherein and three rollers in Fig. 1, can be seen.Cylinder body 20 is cylindrical bodys of a casting, comprises the oil cylinder inserted for plunger rod 30.In fact there are four equally distributed oil cylinders in this embodiment, two wherein in Fig. 1, can be seen.
See Fig. 1, be provided with spring 21 in each oil cylinder, it provides restoring force for corresponding plunger rod 30.In Fig. 1, the upper end of plunger rod 30 is provided with diaphragm seal 22 by the mode such as gluing.The upper end of spring 21 is fixedly connected with the upper-end surface of oil cylinder, and the lower end of spring 21 is connected with diaphragm seal 22.In addition, be provided with circular groove at the side opening of the upper end part of plunger rod 30, seal ring 23 just embeds wherein.
Diaphragm seal 22 and seal ring 23 seal simultaneously, and oil cylinder are divided into superposed oil pressure chamber and the cavity being positioned at bottom together with the upper end of plunger rod 30.Diaphragm seal 22 and seal ring 23 can also prevent the hydraulic oil in oil pressure chamber from revealing and producing the pressure loss, power loss.
The upper end of oil cylinder offers inlet port 24 and force feed mouth 25 respectively.Cam pump provided by the invention also comprises the first baffle plate 40 and positive stop lug boss 41.Upper half part of plunger rod 30 is in oil cylinder, and through the first baffle plate 40 and positive stop lug boss 41.First baffle plate 40 is fixedly connected with cylinder body 20, is mainly used in the position of restriction plunger rod 30, supports cylinder body 20 and limits the position of each oil cylinder.Positive stop lug boss 41 is mainly used in the position limiting plunger rod 30, prevents plunger rod 30 run-off the straight.
The bottom least significant end of plunger rod 30 is provided with groove and hole, and roller 32, through described hole, is positioned in groove by bearing pin 31.Thus, roller 32 can rotate around described bearing pin 31.
Fig. 2 is the partial cutaway schematic of the cylindrical cam according to the embodiment of the present invention one.As shown in Figure 2, cylindrical cam comprises cylindrical body 11, is positioned at curved profile 12 on the end face of cylindrical cam and spline 13.Cylindrical body 11 is ring-type entity steel structure, and its inside is spline 13, and whole cylindrical cam is connected with transmission main shaft by spline 13, and passes through spline 13 by the transmission of power of transmission main shaft to whole cylindrical cam.
Curved profile 12 is placed in the top of cylindrical body 11, is namely on the end face of cylindrical cam, and its thickness is determined according to actual conditions.By outside cylinder face expansion, the cam profile of curved profile 12 correspondence as shown in Figure 3.Fig. 4 is the schematic diagram of the cam profile according to the embodiment of the present invention one, illustrated therein is the position of roller.In conjunction with sectional drawing as shown in Figure 1, see from top to bottom, when cylindrical cam counterclockwise rotates, correspondingly, roller 32 moves from right to left along profile line in the diagram.
Composition graphs 1-5, if roller 32 is from M point setting in motion, from M point to N point process, roller 32 rises gradually, and promote plunger rod 30 simultaneously and moved upward H2 highly, Compress Spring 21, makes hydraulic oil output in performance loop from the force feed mouth 25 of oil cylinder.Also namely, when the roller 32 of plunger system is in B region, then cam pump is in force feed state, is extruded by hydraulic oil, and be pressed into performance loop from the oil pressure chamber of oil cylinder.B region constitutes laminated oil zone.
From N point to H point process, promotion plunger rod 30 moves downward by the rebounding force of spring 21, and namely 32 rollers move downward.Also namely, when the roller 32 of plunger system is in a-quadrant, then cam pump is in oil suction state, hydraulic oil is sucked the oil pressure chamber of oil cylinder from fuel tank by inlet port 24.A-quadrant constitutes oil suction district.
From the whole process of M point H point, roller 32 is attached on the curved profile 12 of cylindrical cam 10 all the time.Curved profile 12 is divided into four equally distributed profile regions, and each profile region comprises a laminated oil zone and an oil suction district.Above-mentioned is exactly force feed, an oil-absorbing process, and the work of cam pump is exactly repeating of this each process.
When the roller 32 of plunger system be in B region and force feed time, the roller 32 of curved profile 12 pairs of plunger system, except active force upwards, also has the power of a side direction.In order to reduce this lateral force, the slope in B region can be reduced.Meanwhile, in order to accelerate swelling rate, the slope of a-quadrant can be strengthened.Therefore, proportion can not be identical in each profile region a-quadrant and B region.
In this embodiment, be provided with four oil cylinders in cylinder body 20 evenly distributedly, it corresponds respectively to four plunger rods 30 and corresponding roller 32.As shown in Figures 3 and 4, the curved profile on the end face of cylindrical cam 10 12 comprises four equally distributed profile regions, and they correspond respectively to four rolling 32, and also, four rolling 32 is in respective profile region, and is in sustained height all the time.Now, each roller 32 is also on the sustained height on the end face of cylindrical cam 10, four oil cylinder I to IV as shown in Figure 5.
Because the curved profile on cylindrical cam 10 is equally distributed, simultaneously four plunger rods 30 upwards or simultaneously move downward, so four oil cylinders realization oil suctions simultaneously or simultaneously force feed.Outside each inlet port 24 and force feed mouth 25, one-way valve is housed, hydraulic oil can only be flowed towards a direction, and prevent from flowing backwards, namely during oil suction, hydraulic oil can only from fuel tank inflow pump, and during force feed, hydraulic oil can only flow to performance loop from pump.Each oil cylinder is separated into an oil pressure chamber and a cavity by diaphragm seal 22, seal ring 23 and plunger rod 32, and the two is not connected.
When roller 32 is in the A district shown in Fig. 3 or 4, then plunger rod 32 moves downward, then hydraulic oil enters oil cylinder from fuel tank by each inlet port 24.When roller 32 is in the B district shown in Fig. 3 or 4, then plunger rod 32 moves upward, then hydraulic oil enters performance loop from oil cylinder by each force feed mouth 25.
Like this, when transmission main shaft rotates a circle, drive the to-and-fro motion in multiple oil cylinder of multiple plunger rods 32 by the curved profile 12 of cylindrical cam 10 simultaneously, achieve repeatedly oil suction and the force feed process of cam pump.Comparatively speaking, the main shaft of existing pump rotates once, and oil pressure chamber can only complete the process of an oil suction and force feed.Under the condition in the oil pressure chamber of same volume, the cam pump delivery that the embodiment of the present invention one provides is larger.Further, the cam pump that the present embodiment provides is while realizing huge discharge, and do not increase the volume of pump significantly, structure is also relatively simple.
In addition, existing plunger pump is mainly inclined disc type, no matter be when be all that a part of oil cylinder is in oil suction state, a part is in force feed state, this just causes cylinder body by force unbalance, and in the pump proposed in this embodiment, all oil cylinders simultaneously be in oil suction or force feed state, the stressed unbalanced phenomenon of cylinder body can be eliminated.
In addition, existing plunger pump has oil distribution casing, oil distribution casing all offers oil suction window and force feed window, and oil cylinder, from oil suction window inhalant liquid force feed, forms seal space, when moving to force feed window, hydraulic oil is pressed into force feed window.Because hydraulic oil has pressure, when seal space periodically opens and closes, and be the opening and closing of moment, so produce larger impact.And the pump that the present embodiment provides has the transition of long period from oil suction State Transferring to force feed state, can effectively reduce to impact.
Certainly, in a modification of above-described embodiment, corresponding to the curved profile 12 of cam 10, the multiple plunger rods 30 in plunger system and roller 32 thereof are circumferentially also can uneven distribution.Multiple roller 32 can be divided into two groups, the motion state of two groups of rollers is inconsistent, but the motion state of all rollers in group is completely the same, that is: all distinguish consistent with the motion state of all rollers in second group for first group.
Further, as shown in Figure 5, in each profile region in curved profile 12, the length of oil suction district A and laminated oil zone B is equal, and namely plunger system oil suction is equal with the time of force feed.Above-mentioned two groups of rollers are in oil suction district and laminated oil zone respectively.Thus, first group of roller is in first on the end face of cylindrical cam highly all the time, second group of roller is in second on the end face of described cylindrical cam highly all the time, because first is highly different from the second height, thus corresponding plunger rod is in different motion states, can realize incessantly to working oil path fuel feeding.
In addition, in another modification of above-described embodiment, corresponding to the curved profile 12 of cam 10, multiple plunger rods 30 in plunger system and roller 32 thereof are in circumferentially also uneven distribution, and do not divide into groups, but under the condition of not interfering and keep uniform force, distribute plunger rod and corresponding roller according to actual needs.The distribution of such as roller can as shown in Figure 6, and multiple roller is on the different heights on the end face of described cylindrical cam.Thus, the working method of cam pump is more flexible and changeable, according to different actual conditions, can be applicable to different operating modes.
Below in conjunction with Fig. 8 and Fig. 9, embodiments of the invention two are described.Implement the similar of the cam pump structure of two and the cam pump of embodiment one, difference is that the cam pump of enforcement two adds action system, and it is for changing the position of cylinder body relative to multiple plunger rod, to change the volume in the oil pressure chamber of multiple oil cylinder.
As shown in Figure 8, this action system comprises actuating strut 60, housing 61, coil 62 and electromagnet 63, also comprises regulator 70.Housing 61 is cylindrical shape, and it is fixedly installed on the working platform of such as cam pump, thus keeps its position constant all the time.Regulator 70 for sending alternating current, and regulates the amplitude of alternating current.Wire 71 connection adjustor 70 and coil 62.The coil 62 of annular is arranged on the internal surface of housing 61, passes into Ac, can produce alternating electromagnetic field in coil 62.Electromagnet 63 is arranged at the middle and upper part of actuating strut 60, and be in alternating electromagnetic field that coil 62 produces, induction field changes and produces power.
Actuating strut 60 can be connected with cylinder body 20 by the otic placode 28 that cylinder body 20 is arranged, thus actuating strut 60 can be pushed away downwards by otic placode 28 or upwards scuffing of cylinder bore body 20.The bottom of housing 61 can also arrange second baffle 64, and actuating strut 60 just can pass from baffle plate 64, therefore second baffle 64 can the position of limit movement bar 60, prevents its run-off the straight.
As shown in Figure 9, for one of them oil cylinder, in the complete oil suction of cam pump one, force feed process, there are three kinds of middle critical states:
I: original state, prepare oil suction; Electromagnet 61 starts to pass into the alternating current that amplitude is A, and pushing action bar 60 moves upward, thus drives cylinder body 20 to move upward, and plunger rod 30 moves downward simultaneously.
II: oil suction completes, prepare force feed; The current amplitude passing into electromagnet becomes-A from A, and pushing action bar 60 moves downward, thus promotion cylinder body 20 moves downward, and plunger rod 30 moves upward simultaneously.
III: force feed completes, prepare oil suction.
In above process, the distance that cylinder body 20 moves up and down is H1, and the distance that plunger rod 30 moves up and down is H2, and the H2 in this H2 and Fig. 3 is equal, and the distance that namely plunger rod 30 moves up and down is determined by the height difference of the curved profile of cylindrical cam.In whole oil suction and force feed process, the hydraulic oil volume that oil cylinder extrudes is (H1+H2) * S, and wherein S is the sectional area of oil cylinder.By changing the amplitude of electromagnet 61 input current, to change the amount of moving up and down of actuating strut 60, thus change the move distance H1 of cylinder body 20, realize the hydraulic oil volume continuously adjustabe that oil cylinder extrudes, now cam pump is variable displacement pump.
In this embodiment, by the relative movement between cylinder body 20 and plunger rod 30, the volume in the oil pressure chamber of oil cylinder is made to produce cyclically-varying.When current amplitude one timing of action system input, the maximum volume that can be formed in oil pressure chamber is certain, and namely necessarily, pump delivery is certain for the hydraulic oil that extrudes of plunger rod 30 motion one-period.But, change the current amplitude of action system input, just can change the maximum volume that can be formed in oil pressure chamber, namely can adjust pump delivery.
Embodiments of the invention three are described below.Implement the similar of the cam pump structure of three and the cam pump of embodiment two, difference is, the regulator implemented in the cam pump of three also comprises induction conversion equipment.
Induction conversion equipment can respond to the pressure size that cam pump exports fluid.The pressure that cam pump exports fluid first responded to by induction conversion equipment, and judge that it is larger or little than setup pressure value, calculate difference, the amplitude (cycle of alternating current is constant) exporting alternating current is changed in corresponding ratio, thus change pump delivery, to realize the constant object of pump output hydraulic pressure oil pressure.
Thus, it is automatic adjustment that the variable discharge capacity of the cam pump of embodiment three regulates, and do not need manual intervention, the pressure of output is constant all the time.
Cam pump of the present invention is described above according to embodiment, but this cam pump is not limited in the parts described in this embodiment and/or annexation, such as, the plunger rod in plunger system and roller thereof are not limited to four, also can other quantity, comprise one or more.Correspondingly, the oil cylinder quantity in cylinder body is also not limited to four, can be one or more.Further, the curved profile on the end face of cylindrical cam is also not limited to four profile regions, can be multiple.When all rollers are not in the sustained height of cam profile, these rollers are not limited to be divided into two groups, also can be divided into three groups or more groups.Action system, except adopting the mode of electromagnetic induction driving, can also pass through alternate manner drive actions bar, such as alternation motor, stepper motor etc.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a cam pump, comprise plunger system and cylinder body (20), it is characterized in that, described cam pump also comprises:
Cylindrical cam (10), its end face has the curved profile (11) comprising multiple profile region, each described profile region comprises oil suction district and laminated oil zone;
Wherein, described plunger system comprises at least one plunger rod (30) and at least one roller (32), and described cylinder body is provided with at least one oil cylinder in (20);
Described at least one roller (32) contacts with described curved profile (11), and drives described at least one plunger rod (30) to-and-fro motion at least one oil cylinder described;
Described cam pump also comprises:
Action system, it is for changing the position of described cylinder body (20) relative to described at least one plunger rod (30), to change the volume in the oil pressure chamber of at least one oil cylinder described;
Described action system comprises:
Actuating strut (60), is connected to described cylinder body (20);
Housing (61), its position immobilizes;
Coil (62), is arranged on described housing;
Regulator (70), is electrically connected with described coil, and provides alternating current for described coil;
Electromagnet (63), is arranged on described actuating strut, and is in the alternating magnetic field of described electromagnet generation.
2. cam pump according to claim 1, is characterized in that, described plunger system comprises multiple plunger rod (30) and corresponding multiple roller (32); The multiple oil cylinders corresponding with described multiple plunger rod (30) are provided with in described cylinder body (20); Described multiple profile region is corresponding with described multiple roller (32).
3. cam pump according to claim 2, is characterized in that, described cam pump also comprises multiple spring (21), and described multiple spring is arranged in corresponding described multiple oil cylinder.
4. cam pump according to claim 2, is characterized in that, described plunger system comprises:
First baffle plate (40), allows described multiple plunger rod (30) to pass through, and limits the position of described multiple oil cylinder;
Positive stop lug boss (41), allows described multiple plunger rod (30) to pass through, and prevents the run-off the straight of described multiple plunger rod (30).
5. cam pump according to claim 2, is characterized in that, described multiple profile region is evenly distributed on the end face of described cylindrical cam (10).
6. cam pump according to claim 5, is characterized in that, described multiple roller (32) is in the sustained height on the end face of described cylindrical cam (10).
7. cam pump according to claim 5, it is characterized in that, described multiple roller (32) is divided into two groups, wherein, first group is in the first height on the end face of described cylindrical cam (10), and second group is in the second height on the end face of described cylindrical cam (10).
8. cam pump according to claim 1, is characterized in that, the volume in the oil pressure chamber of at least one oil cylinder described in described action system periodic variation.
9. cam pump according to claim 1, is characterized in that, described actuating strut is connected on described cylinder body (20) by otic placode (28).
10. cam pump according to claim 1, it is characterized in that, described housing (61) is cylindric, described coil (62) is arranged on the internal surface of described housing, described actuating strut (60) be arranged in described housing at least partially, described electromagnet (63) is arranged at the middle and upper part of described actuating strut.
11. cam pumps according to claim 1, it is characterized in that, described action system also comprises the second baffle (64) of the bottom being arranged at described housing, and described second baffle allows described actuating strut (60) to extend there through, and prevents described actuating strut run-off the straight.
12. cam pumps according to claim 1, it is characterized in that, described regulator (70) also comprises induction conversion equipment, the pressure of the output fluid of described cam pump responded to by this induction conversion equipment, and calculate the comparative result of this pressure and preset pressure value, change the amplitude of the alternating current that described regulator (70) exports according to this comparative result, to change described cam pump delivery, thus ensure that the pressure of the output fluid of described cam pump remains unchanged.
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| CN201310344493.6A CN103397993B (en) | 2013-08-08 | 2013-08-08 | A kind of cam pump |
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| CN104454512B (en) * | 2014-11-04 | 2016-08-24 | 中国农业大学 | A kind of multi-joint lobe pump |
| CN104791211B (en) * | 2015-05-06 | 2016-07-27 | 郑州航空工业管理学院 | Electromagnetic type variable cam mechanism and little pulsation variable-flow fueller |
| CN107493762B (en) * | 2017-09-30 | 2024-03-19 | 盐城工学院 | Seed separating and sowing device suitable for rape direct seeding |
| CN110604330A (en) * | 2019-09-02 | 2019-12-24 | 惠州市三协精密有限公司 | Cavity equipment is gone into to sesame oil preserved fruit |
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| JP2003083194A (en) * | 2001-09-12 | 2003-03-19 | Mikuni Adec Corp | In-tank-type electromagnetic fuel pump |
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| US7966924B1 (en) * | 2008-09-11 | 2011-06-28 | Sauer-Danfoss Inc. | Non-linear feedback in a dual yoke hydromodule |
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