CN217842551U - One-way cam pressurized continuously variable transmission and power machine - Google Patents
One-way cam pressurized continuously variable transmission and power machine Download PDFInfo
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- CN217842551U CN217842551U CN202221732324.0U CN202221732324U CN217842551U CN 217842551 U CN217842551 U CN 217842551U CN 202221732324 U CN202221732324 U CN 202221732324U CN 217842551 U CN217842551 U CN 217842551U
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Abstract
The utility model relates to an one-way cam pressor continuously variable transmission and power machinery makes cam loading system be one-way pressor cam for monotonous change's two-dimensional line segment through setting up the pressurization trajectory, use the dish spring of injecing to satisfy the anti-pressurization demand that drags that leads to among the one-way transmission process as elastic compression element for whole continuously variable transmission's pressurization cam compensation range is wideer, and the structure is compacter, and the great one-way power of more suitable velocity ratio scope and or there is not positive and negative rotation demand operating mode to be used.
Description
Technical Field
The utility model belongs to power machinery derailleur field, concretely relates to pressurized buncher of one-way cam and power machinery.
Background
The cone disc type stepless speed changer is more and more widely used in machinery, and in the prior art, a pressurizing mechanism is mostly arranged on the side of a movable cone disc, for example, a method of pressurizing the movable cone disc of the stepless speed changer in real time by matching an end cam with a hydraulic system or a space cam mechanism for directly pressurizing the movable cone disc is adopted. The stroke of the common end face cam in the arrangement mode cannot meet the axial stroke required by the speed regulation of the movable cone disc. Or the axial stroke required by the speed regulation of the movable conical disc is met by matching with a hydraulic system or adding an axial gear of a cam mechanism. The structure is more complex and not compact enough.
At present, the conical disc type stepless speed changer is mainly used in a bidirectional power machine, so that the use effect is better, but in the actual use process, a plurality of unidirectional power machines are provided, and the rotating direction and the load direction of the unidirectional power machines are kept unchanged in one direction, such as a hydraulic machine, a wind power generation machine, a propeller plane and the like; or the load bearing magnitude difference in the positive and negative load directions is very different, for example, the difference between the driving torque of the transportation machine and the engine anti-drag torque is large.
Chinese patent CN103867678B discloses a conical disc type continuously variable transmission, specifically discloses a pressure mechanism with an end cam, and a pressure structure with a V-shaped groove structure is provided, so that the pressure structure realizes bidirectional pressure in forward and reverse directions, which prolongs the service life of the system and improves the reliability. However, in the case of a large difference between the forward load and the reverse load or in the case of unidirectional transmission, the reverse cam groove causes a long stroke of the pressurizing roller, thereby affecting the dynamic performance of the system and the service life of the whole system.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model aims at providing a low cost, the reliability is high, the better one-way cam pressor continuously variable transmission of transmission efficiency and use its power machinery.
The method is realized by the following technical means:
a stepless speed changer with one-way cam pressurization comprises a driving shaft, a driving fixed cone disc, a driving movable cone disc, a driven shaft, a driven fixed cone disc, a driven movable cone disc and a steel flexible transmission element, wherein the driving fixed cone disc and the driving movable cone disc form a driving cone disc set, the driven fixed cone disc and the driven movable cone disc form a driven cone disc set, and the driving cone disc set and the driven cone disc set work in an environment with lubricating oil through the clamped steel flexible transmission element.
The stepless transmission also comprises a one-way cam pressurizing mechanism, and the one-way cam pressurizing mechanism is arranged on the back of the driving fixed cone disc and/or the driven fixed cone disc; the one-way cam pressurizing mechanism comprises a driving cam, a driven cam, a rolling body and an elastic pressurizing element, wherein the driving cam is connected with a driving shaft and/or a driven shaft in a mode of not allowing mutual rotation (such as direct fixed connection, keying, welding, press fitting, interference fit or bonding); the driven cam is connected with the driving fixed cone disc and/or the back of the driven fixed cone disc in a mode (such as direct fixed connection, key connection, welding, press fitting, interference fit or adhesion) that mutual rotation is not allowed; the end surfaces of the driving cam and the driven cam are respectively provided with n raceways or pressurizing surfaces which are uniformly distributed in the circumferential direction; the n rolling bodies are arranged in the roller path between the driving cam and the driven cam; wherein n is more than or equal to 3 and less than or equal to 9; the raceway comprises a starting section, a pressurizing section and a terminating section after being unfolded along the circumferential direction, the raceways or the pressurizing surfaces of the driving cam and the driven cam are arranged oppositely, and the driving cam and the driven cam are connected through rolling bodies clamped between the oppositely arranged raceways or the pressurizing surfaces.
The pressurizing section is a one-way pressurizing section, the pressurizing section is a three-dimensional curved surface which is constructed by the movement of a semicircular cross section consisting of two sections of non-concentric circular arcs along a trajectory line on a cylindrical surface which is parallel to the axis of the conical disk and takes the axis of the conical disk as the rotation center, the cylindrical surface where the trajectory line is positioned is unfolded into a plane, namely, an unfolding line of the trajectory line of the pressurizing section is unfolded, and the unfolding line of the trajectory line of the pressurizing section is a two-dimensional line section which changes monotonously.
Preferably, the included angle between the pressurizing section, which is formed by expanding the raceway or the pressurizing surface on the end surface of the driving cam along the circumferential direction, and the vertical plane of the rotation center line of the conical disc is alpha 1 (ii) a The pressing after the rolling path or the pressing surface on the end surface of the driven cam is expanded along the circumferential directionThe included angle between the segment and the vertical plane of the rotation center line of the conical disc is alpha 2 (ii) a Gamma is the included angle between the conical surface generatrix of the driving conical disk group and the driven conical disk group of the continuously variable transmission and the vertical plane of the conical disk rotation center line, or the included angle between the tangent line of the conical surface generatrix of the driving conical disk group and the driven conical disk group of the continuously variable transmission at the geometric midpoint and the vertical plane of the conical disk rotation center line;
i max the maximum gear ratio is designed for the continuously variable transmission,
wherein R is Wmin1 The minimum working radius of the driving cone disk group is the minimum enveloping radius of a contact area of the cone disk and the steel flexible transmission element; r Wmax2 The maximum working radius of the driven cone disc group, namely the maximum enveloping radius of the contact area of the cone disc and the steel flexible transmission element, satisfies the following relationship:
preferably, a needle bearing is arranged between the driving cone disc set and/or the driven cone disc set connected with the driven cam and the driving shaft and/or the driven shaft; elastic pressurizing elements are arranged between the driving shaft and/or the driven shaft and the driving cam and/or between the driven cam and the conical disc.
Preferably, the elastic pressing element is a helical spring or the elastic pressing element is one or more disc springs, one axial end of each disc spring is in contact with the one-way cam pressing mechanism in a direct or indirect mode, the other end of each disc spring is in contact with the driving shaft or the driven shaft in a direct or indirect mode, the main pressing direction of each disc spring is the axial direction, and the maximum total axial thrust of the elastic pressing element is F 1 In units of kilonewtons (kN), R max1 Is activeMaximum value of outer radius of conical disc set in mm, R max2 The included angle between the vertical plane of the cone disc rotation center line and the generatrix of the cone disc conical surfaces of the driving cone disc set and the driven cone disc set of the continuously variable transmission or the included angle between the vertical plane of the cone disc rotation center line and the tangent line of the geometric midpoint of the cone disc conical surface generatrix of the driving cone disc set and the driven cone disc set of the continuously variable transmission is the maximum value of the outer radius of the driven cone disc set, and the unit is mm; t is the maximum torque input by the continuously variable transmission, and the unit is Newton-meter (N.m), so that the requirements of the continuously variable transmission are met
Preferably, the rolling bodies are steel balls, and the diameter d of the steel balls is more than or equal to 0.04 (R) max1 +R max2 ) Wherein R is max1 Is the maximum value of the outer radius of a driving cone disc group of the continuously variable transmission, and the unit is mm and R max2 The maximum value of the outer radius of the driven cone disc set of the continuously variable transmission is expressed in mm.
Preferably, the surface hardness of the cam raceway is more than or equal to HRC56; the surface hardness of the rolling element is HRC58 or more.
A power machine uses the aforementioned one-way cam-pressurized continuously variable transmission.
Preferably, the power machine is a flight machine, a power generation machine or an agricultural power machine.
Preferably, the agricultural power machine is a tractor.
The "monotonic variation" of the present invention refers to the trend of monotonic increase or monotonic decrease of the mathematical curve.
The technical effects of the utility model reside in that:
1, because the roller path of the cam is only provided with a pressurizing section in one direction and is not provided with a reverse pressurizing section, the cam-pressurized continuously variable transmission with one-way arrangement is provided, compared with the structure (the same pressurizing sections, namely the so-called V-shaped sections, are arranged in both directions) utilizing a V-shaped roller path or a pressurizing surface in the prior art, the axial movement caused by system deflection and system deformation in the speed ratio change process can be better compensated by arranging a unilateral roller path structure, the structure is more compact, and the cam-pressurized continuously variable transmission is more suitable for working condition application with larger speed ratio range and/or larger torque, and is provided with cam compensation amount caused by corresponding system deflection in different speed ratio ranges of a common straight bus continuously variable transmission shown in figure 1. The utility model discloses a mode of setting up is suitable for the occasion of unidirectional rotation and one-way moment of torsion demand more, and the structure is simpler, and processing, assembly cost are low.
2, for guaranteeing friction formula infinitely variable transmission's reliability, reduce the power loss that too big pressure brought simultaneously, the utility model discloses optimized the pressor angle, through the utility model discloses the pressurization angle of setting for the formula and confirming can make power loss lower on the one hand, improves system efficiency, and on the other hand guarantees the realization of pressurization function, promotes system reliability.
3, through the concrete limited to cam roller (being the rolling element) diameter for it is more suitable the utility model discloses specific one-way cam pressor concrete working method has improved its contact strength at the heavy load during operation, has improved system fatigue life.
4, through specifically injecing (preferred belleville spring) to axial elasticity pressure element, and specifically injecing the scope value of the biggest thrust force of elasticity pressure element, need provide the required axial force of positive and negative power switching for two-way cam loading system, the utility model discloses a set up the mode and more be suitable for the not big occasion of unidirectional rotation or reverse torque demand, can effectively avoid under the impact load rigid flexible transmission elements such as chain slipping on the conical disk surface to and the chain that causes when dragging instead skids, thereby great improvement the whole life-span of system.
Drawings
Fig. 1 shows the cam compensation amount caused by the corresponding system offset in the speed range of 4.5 of the ordinary straight-bus stepless speed change device.
Fig. 2 is a three-dimensional exploded view of a continuously variable transmission according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural view of an active cam according to embodiment 1 of the present invention.
Fig. 4 is a development view of the active cam raceway or the pressing surface circumferential raceway according to embodiments 1 and 2 of the present invention.
Fig. 5 is a three-dimensional exploded view of a continuously variable transmission according to embodiment 2 of the present invention.
Fig. 6 is a vehicle speed change diagram in the low-speed rapid acceleration condition according to embodiment 2 of the present invention.
Fig. 7 is a vehicle speed change diagram in the case of low-speed rapid acceleration according to comparative example 2 of the present invention.
Wherein: 1, driving a shaft; 2, an active cam; 3-1, a coil spring; 3-2, a disc spring; 4, rolling bodies; 5, actively fixing a cone disc; 6, steel flexible transmission element; 7, driving the cone disc; 8, a driven shaft; 9, driven fixed cone disc; 10, a driven dynamic cone disc; 11, a disc spring seat; 201, the end section of the raceway or the pressing surface; 202, a pressing section of a raceway or a pressing surface; 203, initial section of the raceway or pressing surface.
Detailed Description
The stepless speed changer is in friction transmission, a cam pressurizing mechanism needs to ensure that a flexible transmission element and a conical disc surface are always kept in a pressing state, in order to ensure the processing aspect and the contact strength of the flexible transmission element and a conical surface, at present, a straight bus conical disc is mostly adopted for the conical disc, when the transmission ratio is changed, the flexible transmission element moves up and down along the conical disc surface to generate radial displacement and axial displacement, and the flexible transmission element inevitably generates axial deflection in the speed changing process because the working radiuses of a driving shaft and a driven shaft are not completely the same in the speed ratio changing process, and the outward displacement distance or the inward displacement distance of a contact point of the flexible transmission element of the driving shaft and the outward displacement distance or the inward displacement distance of a contact point of the flexible transmission element of the driven shaft are not the same in the assumed constant length of the flexible transmission element. In practical situations, the amount of compensation required is greater due to system degeneration and elongation of the flexible transmission element. The axial force required by the transmission of the flexible transmission element is provided by the cam pressurizing mechanism, the smaller the included angle value between the vertical plane of the rotating central line of the conical disc and the raceway or pressurizing surface after being unfolded along the circumferential direction is, the larger the axial force can be provided, and the axial stroke amount which can be compensated by the cam is reduced, so that the circumferential waste is caused in the situation of power positive and negative asymmetry of the bidirectional cam pressurizing mechanism.
Example 1
As shown in fig. 2, the present embodiment proposes a one-way cam pressurized continuously variable transmission, which includes a driving shaft, a driving cone pulley set, a driven shaft, a driven cone pulley set, a one-way cam pressurizing mechanism, and a steel flexible transmission element. The driving cone disc set comprises a driving fixed cone disc and a driving movable cone disc, the driven cone disc set comprises a driven fixed cone disc and a driven movable cone disc, and the driving cone disc set and the driven cone disc set clamp the steel flexible transmission element to work in a lubricating oil environment. The maximum value of the outer radius of the driving cone disc set is 109mm, the maximum value of the outer radius of the driven cone disc set is 109mm, the included angle between the conical surface generatrix of the driving cone disc set and the conical surface generatrix of the driven cone disc set of the continuously variable transmission and the vertical plane of the rotating center line of the conical discs is 11 degrees, and the back of the driving fixed cone disc is provided with a one-way cam pressurizing mechanism.
The one-way cam pressurizing mechanism comprises a driving cam, a driven cam, a rolling body and an elastic pressurizing element, wherein the driving cam is connected with a driving shaft through a spline, and the driven cam and the driving fixed cone disc are integrated and arranged on the back of the driving fixed cone disc. The end faces of the driving cam and the driven cam are respectively provided with 5 raceways uniformly distributed in the circumferential direction or a pressurizing surface, the driving cam is structurally shown in fig. 3, each raceway or pressurizing surface comprises an initial section 201, a pressurizing section 202 and a terminating section 203, the pressurizing section has a single included angle with the vertical plane of the rotation center line of the conical disc, the end faces where the raceways of the driving cam and the driven cam or the pressurizing surfaces are located are oppositely arranged, and the driving cam and the driven cam are connected through rolling bodies clamped between the raceways on the oppositely arranged end faces or between the pressurizing surfaces.
After the raceway or the pressurizing surface on the end surface of the driving cam is expanded along the circumferential direction, as shown in fig. 4, except for 2 parts of the initial section and the terminating sections 201 and 203 of the raceway or the pressurizing surface, the included angle between the other main pressurizing sections 202 and the vertical plane of the rotation center line of the conical disc is 6.8 degrees; the race or the pressing surface on the end face of the driven cam being expanded in the circumferential direction and then removedThe included angle between the initial section and the vertical plane of the central line of revolution of the conical disk, except 2 parts of the final sections 201 and 203, and the other main pressurizing sections 202 is also 6.8 degrees
The requirements of (2).
The elastic pressurizing elements are 3-1 helical springs, the number of the helical springs is 3, the helical springs are annularly and uniformly distributed in the circumferential direction between the driving cam and the driven cam, the driving cam and the driven cam are abutted through the helical springs, one end of each spring is in contact connection with the pressurizing driving cam, and the direction of a main pressurizing surface of each spring is the tangential direction of rotation of the driving cam; the other end is in contact connection with the driven cam of the driving fixed cone disc, the direction of a main pressurizing surface of the driving fixed cone disc is the tangential direction of the rotation of the driven cam, the maximum compression force of the single spiral spring is 0.17kN, and the requirement of meeting the requirement of the requirement on the maximum compression force of the single spiral spring is met
The requirements of (2).
In order to ensure that the transmission has a compact structure, the outer diameters of the driving cam and the driven cam are smaller than those of the driving cone disc set and the driven cone disc set, and the diameter of the corresponding raceway or the pressing surface of the embodiment in the circumferential direction is 120mm.
In the embodiment, the rolling body is preferably a steel ball, and the diameter of the steel ball is preferably d =25mm, so that d is more than or equal to 0.04 (R) max1 +R max2 ) The requirements of (1).
In this embodiment, preferably, the height of the rotating bus of the conical-disc convex conical surface relative to the protrusion of the connecting straight line at the two ends of the bus is higher than that of the connecting straight line at the two ends of the conical disc, that is, in the same rotating plane where the rotating center line of the conical disc is located, the shortest distance between the tangent line of the rotating bus, which is parallel to the connecting straight line at the two ends of the rotating bus, and the connecting straight line at the two ends of the rotating bus is greater than or equal to 1/200 of the diameter of the conical disc.
Comparative example 1
The stepless speed changer adopting the bidirectional cam pressurization comprises a driving shaft, a driving conical disc set, a driven shaft, a driven conical disc set, a bidirectional cam pressurization mechanism and a steel flexible transmission element. The driving cam and the driven cam roller path or the pressurizing surface of the bidirectional cam pressurizing mechanism are of a V-shaped roller path or V-shaped pressurizing surface structure and comprise a forward pressurizing section, a reverse pressurizing section, a transition section and a terminating section which are connected with each other. The included angle between the forward pressurizing section and the vertical plane of the rotating center line of the conical disc is 6.8 degrees, and the included angle between the reverse pressurizing section and the vertical plane of the rotating center line of the conical disc is 6.8 degrees. The other arrangement is the same as in embodiment 1.
In comparison with the continuously variable transmission of example 1, in the same case of the input torque 630Nm, the length of the flexible transmission element is 939mm, the corresponding rigidity is 0.00092913KN/mm, the axial stroke compensation amount of the cam pressing mechanism of example 1 is 4.5mm, the axial stroke compensation amount of the cam pressing mechanism of example 1 is 3mm, the compensation amount of the pressing mechanism requirement caused by system deviation is 2mm in the speed ratio range of 5, the tension of the flexible transmission element is 13.2KN, the contact point of the flexible transmission element of the driving shaft moves outwards, the axial stroke of the corresponding cam raceway is required to be compensated for being larger than 1mm, the flexible transmission element of example 1 slips, and the transmission reliability is reduced.
Example 2
A stepless speed variator with one-way cam pressure is shown in fig. 5 and comprises a driving shaft, a driving cone disc set, a driven shaft, a driven cone disc set, a one-way cam pressure mechanism and a steel flexible transmission element. The driving cone disc set comprises a driving fixed cone disc and a driving movable cone disc, the driven cone disc set comprises a driven fixed cone disc and a driven movable cone disc, and the driving cone disc set and the driven cone disc set clamp the steel flexible transmission element to work in a lubricating oil environment. The maximum value of the outer radius of the driving cone disc set is 109mm, the maximum value of the outer radius of the driven cone disc set is 109mm, the included angle between the conical surface generatrix of the driving cone disc set and the conical surface generatrix of the driven cone disc set of the continuously variable transmission and the vertical plane of the rotating center line of the conical discs is 11 degrees, and the back of the driving fixed cone disc is provided with a one-way cam pressurizing mechanism.
The one-way cam pressurizing mechanism comprises a driving cam, a driven cam, a rolling body and an elastic pressurizing element, wherein the driving cam is connected with a driving shaft through a spline, and the driven cam and the driving fixed cone disc are integrated and arranged on the back of the driving fixed cone disc. The end faces of the driving cam and the driven cam are respectively provided with 5 roller paths or pressurizing faces which are uniformly distributed along the circumferential direction with the diameter of 200mm, the included angle between each roller path or pressurizing face and the vertical face of the rotation center line of the conical disc is single, the end faces where the roller paths or pressurizing faces of the driving cam and the driven cam are located are arranged oppositely, and the driving cam and the driven cam are connected through rolling bodies clamped between the roller paths or pressurizing faces on the end faces which are arranged oppositely.
After the raceway or the pressurizing surface on the end surface of the driving cam is expanded along the circumferential direction, the included angle between the other main pressurizing part 202 and the vertical plane of the rotation center line of the conical disc is 6.8 degrees except for 2 parts of the initial section and the terminating sections 201 and 203 of the raceway or the pressurizing surface; after the roller path or the pressurizing surface on the end surface of the driven cam is expanded along the circumferential direction, except 2 parts of the initial section and the end sections 201 and 203 of the roller path or the pressurizing surface, the included angle between the rest main pressurizing part 202 and the vertical plane of the rotation center line of the conical disc is also 6.8 degrees, so that the requirement of meeting the requirement of the rotation center line of the conical disc is met
The requirements of (1).
The elastic pressurizing element is a disc spring 3-2, the disc springs are 3 pieces, one end of an axial groove of the disc spring is abutted to the driving cam, the other end of the axial groove of the disc spring is placed in the disc spring seat 11 and abutted to the driving shaft through the disc spring seat, the direction of a main pressurizing surface of the disc spring seat is axial, and the total maximum compression force F is 1 =16kN, satisfies
The requirements of (1).
In the embodiment, the rolling body is a steel ball, the diameter d of the steel ball is =25mm, and d is more than or equal to 0.04 (R) max1 +R max2 ) The requirements of (1).
The rotating bus of the conical disc convex conical surface is higher than the connecting straight line at the two ends of the bus, namely, in the same rotating plane where the rotating center line of the conical disc is located, the shortest distance between the rotating bus and the connecting straight line at the two ends of the rotating bus is more than or equal to 1/200 of the diameter of the conical disc, and the tangent line of the rotating bus is parallel to the connecting straight line at the two ends of the rotating bus.
Comparative example 2
The stepless speed changer adopting bidirectional cam pressurization comprises a driving shaft, a driving cone disc set, a driven shaft, a driven cone disc set, a bidirectional cam pressurization mechanism and a steel flexible transmission element. The two-way cam pressurizing mechanism has V-shaped rolling path or V-shaped pressurizing surface structure comprising mutually connected forward pressurizing section, reverse pressurizing section, transition section and terminating section, and the elastic pressurizing element is 3 disc springs with axial bevel end contacting the driving cam and the other end contacting the driving shaft via the disc spring seat 1 =4kN. The other arrangement is the same as in example 2.
In the continuously variable transmission of the comparative example 2 and the embodiment 2, in the same road, the transmission is connected with a speed regulating motor, a rapid acceleration test (keeping the engine speed at 500rpm stable, rapidly increasing the throttle opening to 99% within 2s, and then rapidly releasing) is carried out under the condition of low speed, the speed change of the transmission in the embodiment 2 and the comparative example 2 is shown in fig. 6 and 7, for the embodiment 2, after the throttle is rapidly stepped on, the speed ratio of the transmission is steadily changed from large to small, corresponding to the steady increase of the rotation speed of the shaft II, and after the throttle is rapidly released, the speed ratio of the transmission is steadily changed from small to large, corresponding to the steady decrease of the rotation speed of the shaft II; in the comparative example 2, as shown in fig. 7, after the accelerator is quickly stepped on, the speed ratio of the transmission changes from large to small and fluctuates at a certain frequency, corresponding to the fact that the rotating speed of the shaft II fluctuates at a certain frequency in the process of reaching the peak rotating speed, and after the accelerator is quickly loosened, the speed ratio of the transmission changes from small to large and corresponds to the fact that the rotating speed of the shaft II tends to steadily decrease after small oscillation at a certain frequency. It can thus be seen that example 2 has higher system reliability and overall lifetime than comparative example 2.
Claims (10)
1. A stepless speed changer pressurized by a one-way cam comprises a driving shaft, a driving fixed cone disc, a driving movable cone disc, a driven shaft, a driven fixed cone disc, a driven movable cone disc and a steel flexible transmission element, wherein the driving fixed cone disc and the driving movable cone disc form a driving cone disc group, the driven fixed cone disc and the driven movable cone disc form a driven cone disc group, and the driving cone disc group and the driven cone disc group work in an environment with lubricating oil through the clamped steel flexible transmission element; the method is characterized in that:
the stepless speed changer also comprises a one-way cam pressurizing mechanism, and the one-way cam pressurizing mechanism is arranged on the back of the driving fixed cone disc and/or the driven fixed cone disc; the one-way cam pressurizing mechanism comprises a driving cam, a driven cam, a rolling body and an elastic pressurizing element, wherein the driving cam is connected with the driving shaft and/or the driven shaft in a non-rotation mode; the driven cam is connected with the driving fixed cone disc and/or the back surface of the driven fixed cone disc in a mode of not allowing mutual rotation; the end surfaces of the driving cam and the driven cam are respectively provided with n raceways or pressurizing surfaces which are uniformly distributed in the circumferential direction; the n rolling bodies are arranged in the roller path between the driving cam and the driven cam; wherein n is more than or equal to 3 and less than or equal to 9; the raceway comprises an initial section, a pressurizing section and a termination section after being expanded along the circumferential direction, the raceways or pressurizing surfaces of the driving cam and the driven cam are arranged oppositely, and the driving cam and the driven cam are connected through rolling bodies clamped between the oppositely arranged raceways or pressurizing surfaces;
the pressurization section is set to be one-way, the pressurization section is a three-dimensional curved surface which is constructed by the motion of a semicircular cross section consisting of two sections of non-concentric circular arcs along a track line on a cylindrical surface which is parallel to the axis of the conical disk and takes the axis of the conical disk as a revolution center, the cylindrical surface on which the track line is positioned is unfolded to be a plane, namely, an unfolding line of the track line of the pressurization section is unfolded, and the unfolding line of the track line of the pressurization section is a two-dimensional line section which changes monotonously.
2. The single-direction cam-pressurized continuously variable transmission according to claim 1, wherein the pressing section of the end surface of the drive cam after the raceway or pressing surface is expanded in the circumferential direction is sandwiched between the pressing section and a perpendicular surface to the rotation center line of the conical diskAngle alpha 1 (ii) a The included angle between the pressurizing section and the vertical plane of the rotation center line of the conical disc after the roller path or the pressurizing surface on the end surface of the driven cam is expanded along the circumferential direction is alpha 2 (ii) a Gamma is the included angle between the conical surface generatrix of the driving conical disk group and the driven conical disk group of the continuously variable transmission and the vertical plane of the conical disk rotation center line, or the included angle between the tangent line of the conical surface generatrix of the driving conical disk group and the driven conical disk group of the continuously variable transmission at the geometric midpoint and the vertical plane of the conical disk rotation center line;
i max the maximum gear ratio is designed for the continuously variable transmission,
wherein R is Wmin1 The minimum working radius of the driving cone disk group is the minimum enveloping radius of a contact area of the cone disk and the steel flexible transmission element; r is Wmax2 The maximum working radius of the driven cone disc group, namely the maximum enveloping radius of the contact area of the cone disc and the steel flexible transmission element, satisfies the following relationship:
3. the one-way cam-pressurized continuously variable transmission of claim 1, wherein a needle bearing is provided between the driving cone pulley set and/or the driven cone pulley set to which the driven cam is connected and the driving shaft and/or the driven shaft; elastic pressurizing elements are arranged between the driving shaft and/or the driven shaft and the driving cam and/or between the driven cam and the conical disc.
4. A one-way cam-pressurized continuously variable transmission as claimed in claim 3, wherein said elastic pressurizing member is a coil spring or said elastic pressurizing member is a coil springThe elastic pressurizing element is one or more disc springs, one axial end of each disc spring is in contact with the one-way cam pressurizing mechanism in a direct or indirect mode, the other end of each disc spring is in contact with the driving shaft or the driven shaft in a direct or indirect mode, the main pressurizing direction of each disc spring is the axial direction, and the axial total maximum thrust of the elastic pressurizing element is F 1 In the unit kN, R max1 Is the maximum value of the outer radius of the driving cone disc set, and the unit is mm and R max2 The included angle between the vertical plane of the cone disc rotation center line and the generatrix of the cone disc conical surfaces of the driving cone disc set and the driven cone disc set of the continuously variable transmission or the included angle between the vertical plane of the cone disc rotation center line and the tangent line of the geometric midpoint of the cone disc conical surface generatrix of the driving cone disc set and the driven cone disc set of the continuously variable transmission is the maximum value of the outer radius of the driven cone disc set, and the unit is mm; t is the maximum torque input by the continuously variable transmission, and the unit is Newton-meter (N.m), so that the requirements of the continuously variable transmission are met
5. The single direction cam pressurized continuously variable transmission of claim 1, wherein said rolling elements are steel balls having a diameter d ≥ 0.04 (R ≥ R) max1 +R max2 ) Wherein R is max1 Is the maximum value of the outer radius of a driving cone disc group of the continuously variable transmission, and the unit is mm and R max2 The maximum value of the outer radius of the driven cone pulley set of the continuously variable transmission is in mm.
6. A one-way cam-pressurized continuously variable transmission as claimed in claim 1, wherein the surface hardness of said raceway of the cam is HRC56 or more.
7. The one-way cam-pressurized continuously variable transmission of claim 1, wherein the surface hardness of the rolling elements is HRC58 or more.
8. A power machine characterized by using a continuously variable transmission pressurized by a one-way cam according to any one of claims 1 to 7.
9. The power machine of claim 8, wherein the power machine is a flight machine, an electric power generation machine, or an agricultural power machine.
10. The power machine of claim 9, wherein the agricultural power machine is a tractor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221732324.0U CN217842551U (en) | 2022-07-07 | 2022-07-07 | One-way cam pressurized continuously variable transmission and power machine |
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| CN202221732324.0U CN217842551U (en) | 2022-07-07 | 2022-07-07 | One-way cam pressurized continuously variable transmission and power machine |
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| CN217842551U true CN217842551U (en) | 2022-11-18 |
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| CN202221732324.0U Active CN217842551U (en) | 2022-07-07 | 2022-07-07 | One-way cam pressurized continuously variable transmission and power machine |
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| Country | Link |
|---|---|
| CN (1) | CN217842551U (en) |
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2022
- 2022-07-07 CN CN202221732324.0U patent/CN217842551U/en active Active
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