Hydraulic control swash plate and manufacturing method thereof

Abstract

The present invention discloses a hydraulically controlled swash plate and a manufacturing method thereof. The hydraulically controlled swash plate mainly comprises a rotating body, a support seat, a screw, a pin shaft, a support plate, a shift fork, a retaining ring, and a transmission pin. The swash plate mechanism and the manufacturing method adopted decompose the originally integrated special-shaped swash plate into the rotating body, the support seat, the support plate, and the shift fork and process them separately. After the components are machined and formed, they are positioned and fastened to each other. This makes it suitable for mass production of ordinary machine tools and achieves high machining accuracy to meet usage requirements. After assembly, the swash plate of the present invention does not require pre-pressure positioning, and only the single degree of freedom of controlling rotation remains. A flat surface or a ball-and-socket tray can be configured to cope with various plunger forms such as sliding shoes or ball heads, thereby realizing a hydraulic-mechanical transmission with divided speed converging and divided speed increasing.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic transmission, in particular to a swash plate for variable control of hydraulic transmission and a manufacturing method thereof. Background Art

[0002] The traditional swash plate used for variable control of hydraulic transmission has many technical defects due to the limitations of its design structure.

[0003] 1. The traditional swash plate uses two narrow arcs at the top and bottom as the load-bearing contact surface. The arcs are narrow and short, the pressure-bearing area is small, the contact stress is large, and the load-bearing capacity is limited.

[0004] Second, due to the limitations of the load-bearing structure and the high contact stress, traditional swash plates generally use rolling bearings as supports to flexibly control the rotation of the swash plate. However, rolling bearings are in line contact, which further increases the contact stress. In particular, as the number of bearing balls decreases during the gradual increase in the variable, the contact stress will rise sharply, which brings extremely high requirements for the mechanical properties of the material and the high hardness processing requirements of the material. If sliding bearings are used for support, complex flow channels need to be set up to draw high-pressure oil to offset part of the contact load-bearing force, which not only complicates the structural design but also reduces the volumetric efficiency.

[0005] 3. Due to the limitations of the design structure, the lever arm of the traditional swash plate to control its own rotation is small, but the reaction lever arm of the hydraulic system pulsation is large, and the ratio of the reaction lever arm to the control rotation lever arm is large, which inevitably requires a larger driving force. Therefore, hydraulic drive is adopted. Due to the limitation of the low servo control pressure, the cylinder diameter of the existing variable servo control cylinder is large, and due to the pulsation of the hydraulic system and the increasing effect of the pulsation torque, the variable servo control cylinder also needs to be equipped with a large flexible preload, which will lead to a further increase in the cylinder diameter. In summary, the volume of the overall control structure is larger; the traditional swash plate is limited by the structure of a single control lever arm and a single-side drive. When it is used in a closed system with bidirectional high and low pressure inlet and outlet oil, the load will be twisted away from the end of the lever arm.

[0006] Fourth, based on the traditional assembly and use of the swash plate, additional preload positioning is required. Generally, a ball joint installed on the main shaft is used to compress the return plate, which in turn presses on the sliding shoe. The sliding shoe contacts the swash plate and preloads the swash plate. This complex structure, and the ball joint applies pressure via a spring installed on the main shaft, inevitably generates a certain amount of mechanical power loss, especially at low pressure, which reduces the overall transmission efficiency.

[0007] 5. The relative motion of the traditional swash plate is that the shoe slides on the surface of the swash plate, and cannot run in a relative rolling manner. In addition, the effect of preload causes greater losses when running at high speed and low pressure.

[0008] 6. The traditional swash plate can only perform a single hydraulic transmission, that is, it can only perform axial oil pressure drive, cannot divide the speed or flow of the main drive, cannot perform parallel synchronous transmission of mechanical flow and hydraulic flow, and cannot realize the transmission function of dividing speed and converging flow or dividing and converging flow.

[0009] In view of the existing technical deficiencies, it is urgent to propose a new control swash plate to solve the above-mentioned problems. The hydraulic control swash plate proposed in the present invention can solve the above-mentioned problems, but it has great technical difficulties in manufacturing and requires complex processes and process structures to ensure the ultimate processing accuracy and performance. Therefore, a complete and feasible manufacturing method is needed to solve the processing problems of the control swash plate. Summary of the Invention

[0010] The technical problem solved by the present invention is to provide a hydraulic control swash plate and a manufacturing method thereof to solve the problems in the above-mentioned background technology.

[0011] The technical problem solved by the present invention is achieved by adopting the following technical solutions:

[0012] The hydraulically controlled swash plate is mainly composed of a rotary body, a support seat, screws, a pin shaft, a support plate, a shift fork, a retaining ring, and a transmission pin. The support plate is arranged on the support seat, and the support plate is limited by contact with the support seat through a plane and a circular arc. The support seat is arranged on the rotary body, and the support seat is limited by contact with the rotary body through a circular arc. The rotary body, support seat and support plate are positioned at the same time by the pin shaft, and then the rotary body, support seat and support plate are fastened together by screws.

[0013] The shift fork is set on the rotating body, and the shift fork is limited by the contact with the rotating body through the arc, and the relative position between the shift fork and the rotating body is further limited by the pin shaft, thereby fastening the shift fork and the rotating body into one;

[0014] The transmission pin can be rotatably arranged on the shift fork and then limited by the retaining ring;

[0015] The swash plate in the assembled and used state has only one degree of freedom of rotation in one direction, and the other degrees of freedom are restricted. The load borne by the swash plate in the used state is borne by the spherical surface on the rotating body, and the support plate and support seat bear the counter-support force of the moment balance.

[0016] In the present invention, the geometric elements provided on the rotating body include a rotating body screw hole, a rotating body positioning hole, a rotating body right end face, an outer circle of the rotating body, a rotating body spherical surface, a rotating body left end face, a primary inner cavity, a secondary inner cavity, a retaining ring groove, a bearing inner cavity, and a rotating body shift fork positioning hole. The main body of the rotating body is rotated and formed about the rotation axis of the outer circle of the rotating body. The inner and outer rotating geometric elements constituting the rotating body are coaxial with the rotation axis of the outer circle of the rotating body. The inner cavity of the rotating body is provided with a retaining ring groove, a bearing inner cavity, a primary inner cavity, and a secondary inner cavity in sequence from the right end face of the rotating body to the left end face of the rotating body. The outer periphery of the rotating body is provided with an outer circle of the rotating body and a rotating body spherical surface in sequence from the right end face of the rotating body to the left end face of the rotating body. A rolling bearing can be provided in the bearing inner cavity. A flat tray or a ball socket tray can be provided on the rolling bearing. The flat end face of the flat tray is used to support the sliding shoe end face of the sliding shoe plunger, and the end spherical socket surface of the ball socket tray is used to support the spherical surface of the ball head plunger. The rolling bearing is limited by a retaining ring set in the retaining ring groove. A boss is set at the connection between the bearing inner cavity and the first-level inner cavity to axially position and load the rolling bearing. The first-level inner cavity and the second-level inner cavity are connected to each other and penetrate the rotating body. The geometric structure of the first-level inner cavity and the second-level inner cavity allows the rotating body to avoid interference with the main shaft when rotating under variable control. The left end face and the spherical surface of the rotating body are intersected by an arc transition, the spherical surface of the rotating body and the outer circle of the rotating body are intersected by an arc transition, and the outer circle of the rotating body and the right end face of the rotating body are intersected by a chamfer transition. The intersecting arcs can avoid damage to the contact surface due to micro-deformation at the intersection when bearing and increase the running resistance. The outer circle of the rotating body is symmetrical about the rotation axis of the rotating body. A rotating body screw hole and a rotating body positioning hole are provided, the axes of the rotating body positioning holes symmetrically arranged on both sides are coaxial, and the axes of the rotating body positioning holes are perpendicularly intersected with the axis of the rotating body, and the two perpendicularly intersecting axes form a reference plane. Rotating body fork positioning holes are also provided at other parts of the outer circle of the rotating body, and the rotation axis of the rotating body fork positioning holes is perpendicular to the reference plane. The center Y of the spherical surface of the rotating body is located on the rotation axis of the outer circle of the rotating body, the right end face of the rotating body is located on one side of the center Y, and the center Y is not on the main body of the rotating body.

[0017] In the present invention, the geometric elements arranged on the support seat include the support seat fastening arc surface, the support seat positioning hole, the support seat screw hole, the support seat outer circle, the support seat matching arc surface, the support seat end face, the support seat receiving surface, the support seat receiving arc, the support seat limiting boss, and the support seat parting surface. The rotation axes of the support seat outer circle, the support seat matching arc surface, and the support seat receiving arc are coaxial, and the center Z of the support seat is located on the common rotation axis of the three. On the main body of the support seat, the support seat outer circle and the support seat matching arc surface are the outer arc surface, the support seat receiving arc is the inner arc surface, the diameter of the support seat receiving arc is smaller than the diameter of the support seat matching arc surface, the diameter of the support seat matching arc surface is smaller than the diameter of the support seat outer circle, and the support seat outer circle and the support seat matching arc surface intersect and connect to form a support seat limiting boss, and the plane where the support seat limiting boss is located is perpendicular to the rotation axis of the support seat matching arc surface, and the plane cutting perpendicular to the rotation axis of the support seat matching arc surface The support seat receiving arc and the support seat cooperate with the arc surface to form the support seat end face, the support seat receiving surface is sunk in the support seat receiving arc, and the plane where the support seat receiving surface is located is perpendicular to the rotation axis of the support seat receiving arc, and the plane where the support seat receiving surface and the support seat limiting boss are located are on the same side of the support seat end face, and the support seat parting surface of the cutting support seat is parallel to the rotation axis of the support seat receiving arc after the cutting support seat receiving arc is not on the entity of the support seat, and the rotation axis of the support seat fastening arc surface formed after cutting the support seat is perpendicular to the rotation axis of the support seat receiving arc, and the entity vertical distance formed between the phase fixed point of the support seat fastening arc surface and the support seat receiving surface is greater than zero, and the support seat positioning hole and the support seat screw hole are arranged on the main body of the support seat perpendicular to the support seat receiving surface, and then pass through the entity between the support seat fastening arc surface and the support seat receiving surface, and the diameter of the support seat fastening arc surface is consistent with the diameter of the outer circle of the rotating body.

[0018] In the present invention, the geometric elements arranged on the support piece include a support piece positioning arc, a support seat parting surface, a support piece receiving arc, a support piece positioning hole, a support piece screw hole, a support piece center, and a support piece positioning plane. The rotation axis of the support piece positioning arc and the rotation axis of the support piece receiving arc are coaxial, the center of the support piece is located on the common rotation axis of the two, and the two arcs form a common support piece center. The diameter of the support piece positioning arc is smaller than the diameter of the support piece receiving arc. The support seat parting surface is parallel to the rotation axis of the support piece positioning arc and is symmetrical about the support piece positioning arc and is arranged on both sides of the support piece positioning arc. The support piece positioning arc The connecting and intersecting surface with the support seat parting surface is perpendicular to the support seat parting surface, thereby forming a complete semicircular arc of the support piece positioning arc. The support piece receiving arc is smaller than the complete semicircular arc. A support piece positioning hole and a support piece screw hole are provided on the support piece formed on the plane where the support piece receiving arc and the support seat parting surface are located. Both sides of the support piece are support piece positioning planes, and the two side surfaces are not used separately during assembly. The diameter of the support piece receiving arc is consistent with the diameter of the support seat receiving arc. The support piece screw hole, the support seat screw hole and the rotating body screw hole are coaxial when assembled, and the support piece positioning hole, the support seat positioning hole and the rotating body positioning hole are coaxial when assembled.

[0019] The shift fork is connected to the shift fork by a U-shaped hole, and the shift fork is connected to the shift fork by a U-shaped hole. A transmission groove is provided on the mother or hydraulic servo cylinder respectively, and a part of the transmission pin can be rotatably set on the shift fork, and the other part can be movably set in the transmission groove. The motor drives the screw to rotate to push the electronically controlled ball nut to move or the hydraulic oil pushes the hydraulic servo cylinder to move, and then drives the swash plate to rotate through the transmission pin. In this process, the transmission pin moves laterally with the electronically controlled ball nut or the hydraulic servo cylinder while also moving longitudinally along the transmission groove to compensate for the relative position change caused by the rotation of the swash plate around the rotating axis X; a shift fork fastening arc surface is provided on one side of the shift fork receiving body, and a shift fork positioning hole is provided on the shift fork receiving body on this side, and the diameter of the shift fork fastening arc surface is consistent with the diameter of the outer circle of the rotating body on the rotating body.

[0020] In the present invention, the support piece is positioned on the support seat by contacting the support piece positioning plane with the support seat receiving surface, and the support seat receiving arc is in contact with the support piece receiving arc for limiting, the support seat fastening arc surface is in contact with the outer circle of the rotating body for limiting, the rotation axes of the support piece positioning hole, the support seat positioning hole and the rotating body positioning hole are correspondingly coaxial, the rotation axes of the support piece screw hole, the support seat screw hole and the rotating body screw hole are correspondingly coaxial, and the pin shaft is simultaneously positioned with the rotating body positioning hole, the support seat positioning hole and the support piece positioning hole, further limiting the relative freedom of the support piece, the support seat and the rotating body, and the screw passes through the support piece screw hole and the support seat screw hole and is screwed into the rotating body screw hole for fastening;

[0021] The shift fork fastening arc surface contacts and limits the outer circle of the rotating body, and a part of the pin shaft is set in the shift fork positioning hole, and the other part is set in the rotating body shift fork positioning hole on the rotating body, thereby completing the full degree of freedom restriction of the shift fork and the rotating body. The shift fork and the rotating body are welded and fixed, and a weld H is formed at the contact intersection line between the two;

[0022] After assembly is complete, the rotation axis of the support plate positioning arc is coaxial with the rotation axis of the supporting seat matching arc surface. The rotation axes of the support plate positioning arcs on the support plates on both sides of the rotating body are coaxial with the rotation axis X. The rotation axis X and the rotation axis of the rotating body intersect perpendicularly, and the intersection of the two coincides with the center Y of the spherical surface of the rotating body. The intersection of the rotation axis X and the rotation axis of the rotating body forms a symmetry plane, and the right and left levers of the shift fork are symmetrical about this symmetry plane.

[0023] After the swash plate is installed in the box, the spherical surface of the rotating body, the support seat limiting boss, the support seat matching arc surface, and the support piece positioning arc are respectively contacted and limited with the box, limiting the swash plate to rotate only around the rotary axis X.

[0024] The manufacturing method of the hydraulic control swash plate has the following specific steps:

[0025] Step 1: Normalizing heat treatment of the raw materials of the rotating body, support seat, support plate, shift fork and transmission pin;

[0026] Step 2: Complete machining according to the designed geometric elements of the rotating body, support seat, support plate, shift fork, and transmission pin;

[0027] Step 3: Position and tighten the rotating body and the fork;

[0028] Step 4: Position and tighten the rotating body, support seat and support plate;

[0029] Step 5: Install the drive pin onto the fork and position it with the retaining ring.

[0030] In the present invention, the machining of the rotating body in step 2 is completed by a turning center through one-time clamping to ensure the positional accuracy between the various parts.

[0031] In the present invention, in step 2, the machining of the support seat is first performed by a single-head dual-spindle turning center to process all geometric elements except the support seat fastening arc surface and the support seat parting surface. This machining includes the main bodies of the two support seats, and the obtained outer circle of the support seat, the supporting seat matching arc surface, and the supporting seat receiving arc are complete cylindrical surfaces in the entire circumference. The obtained end face of the support seat and the supporting seat limiting boss are complete circular rings in the entire circumference, and the obtained support seat receiving surface is a complete circular plane. After the dual-spindle turning center completes the single-head machining, the secondary shaft clamps the outer circle of the support seat and processes the supporting seat fastening arc surface with the reverse head. This machining also includes the main bodies of the two support seats. After the dual-spindle turning center completes the two-head machining, the two support seats connected as one are cut apart from the middle to obtain two support seats.

[0032] In the present invention, the support sheet is machined in step 2 by punching the sheet metal, and the punching arrangement adopts a reverse-head butt-jointing method to obtain the maximum utilization rate of the sheet metal.

[0033] In the present invention, in step 2, the machining of the shift fork first adopts a cutting method to obtain the main structure of the shift fork receiving body, the shift fork right rod and the shift fork left rod, and obtains the shift fork U-shaped cavity and the shift fork fastening arc surface. After the cutting is completed, the shift fork positioning hole, the shift fork right pin hole and the shift fork left pin hole are completed in one processing by a machining center.

[0034] In the present invention, the rotating body is contacted and positioned with the support seat, the support seat and the support plate are contacted and positioned, and the final positioning of the rotating body, the support seat and the support plate is completed by the pin shaft, and then the rotating body, the support seat and the support plate are fastened by screws.

[0035] In the present invention, the rotating body and the shift fork are contacted and positioned, and the final positioning of the rotating body and the shift fork is completed by the pin shaft, and then the rotating body and the shift fork are fastened by welding. Beneficial effects

[0036] 1. The present invention adopts large spherical support, with large pressure-bearing area, small contact stress, and high pressure and large displacement bearing capacity;

[0037] 2. The large spherical support of the present invention can flexibly control the rotation of the swash plate without the use of rolling or sliding bearings. It has a simple and practical structure, and the area difference after the displacement limit rotation is small. It has low requirements for the mechanical properties of the material and can be met by using ductile iron. It does not require high-strength heat treatment and has low manufacturing costs.

[0038] 3. The shift fork control end driving force application point is far from the center of the rotating ball, resulting in a long action arm and low required control driving force. This invention has the outstanding and substantial advantage of being adaptable to both hydraulic and electronic control. The reaction arm of the hydraulic system's pulsation is small, and the ratio of the reaction arm to the control rotation arm is small, eliminating the effect of increased pulsation torque. Hydraulic control eliminates the need for a large flexible preload, and the variable servo control cylinder has a small bore. Electronic control of the ball screw eliminates the need for a flexible preload. The variable servo control structure is simple and compact, significantly improving control mechanism requirements compared to conventional swash plates.

[0039] 4. The swash plate drive control method of the present invention adopts a dual-arm, dual-side drive mode, with consistent driving force on both sides. When applied to a closed system with bidirectional high and low pressure oil inlet and outlet, there is no load torsion on the swash plate itself. The symmetrical swash plate fork structure also provides consistent driving torque on both ports.

[0040] 5. The large spherical surface of the present invention not only provides load-bearing but also self-positioning. Furthermore, with the aid of a support seat and support plate, full-degree-of-freedom positioning can be achieved after assembly without any preload. This lack of preload does not generate additional power loss, and the swash plate can be flexibly configured with either a flat tray or a ball-and-socket tray, thus embodying the outstanding substantial features of both sliding shoe-type plungers and ball-end-type plungers.

[0041] 6. In the present invention, rolling bearings are used when arranging the flat tray or ball-and-socket tray with the swash plate. If a flat tray is used with a sliding shoe plunger, the circumferential friction between the sliding shoe and the flat tray is greater than the rolling friction of the bearing. Therefore, there is no circumferential motion between the sliding shoe and the flat tray, while the circumferential motion between the sliding shoe and the swash plate is accomplished by the rolling bearing. If a ball-and-socket tray is used, there is similarly no circumferential sliding between the plunger ball and the ball-and-socket tray. The plunger ball only experiences minor relative rolling in the ball socket, while the circumferential motion between the plunger ball and the swash plate is also accomplished by the rolling bearing. These various operating modes eliminate the high-speed circumferential motion of a conventional swash plate, significantly reducing mechanical losses and thereby improving transmission efficiency.

[0042] 7. A rolling bearing is disposed between the swash plate and the flat tray or ball-and-socket tray of the present invention. A speed differential can be generated between the flat tray or ball-and-socket tray and the swash plate. This speed differential can be either an accelerating or decelerating speed differential. In the decelerating speed differential, the rotational speeds of the mechanical and hydraulic transmission circuits are simultaneously divided and their power is simultaneously converged, achieving the effect of equal power reduction and torque increase. In the accelerating speed differential, the power of the mechanical transmission circuit can be diverted to the hydraulic circuit, while the mechanical circuit maintains its original speed. The diverted hydraulic circuit accelerates and then converges with the original mechanical circuit to achieve the transmission effect of diversion and acceleration.

[0043] 8. This invention adopts an overall solution of split-part finishing followed by high-precision assembly. The swash plate is simplified by splitting it into its components, separating the complex and irregularly shaped swash plate into a rotating body, shift fork, support seat, and support plate, and then machining each component individually. This makes it suitable for mass production using common machine tools, eliminating the need for turning, boring, and milling composite machining equipment. Furthermore, split-part machining allows each component to be machined simultaneously without interfering with each other, significantly improving the production efficiency of complex and irregularly shaped components.

[0044] 9. The support pieces are punched in a reverse-head-butted distribution method, which has high efficiency, less waste and low manufacturing cost. The support seats are first processed in two pieces as a whole and then split, turning the special-shaped parts into easy-to-process shaft parts, which is convenient for batch processing, with high efficiency, less cutting waste and good economy. After cutting and splitting, they are easy to assemble in groups, achieving higher assembly accuracy and consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A three-dimensional schematic diagram of a swash plate according to a preferred embodiment of the present invention Figure 1 ;

[0046] Figure 2 A three-dimensional schematic diagram of a swash plate according to a preferred embodiment of the present invention Figure 2 ;

[0047] Figure 3 This is a front view of the swash plate assembly of a preferred embodiment of the present invention;

[0048] Figure 4 This is a left side view of the swash plate assembly of a preferred embodiment of the present invention;

[0049] Figure 5 This is a sectional view of the swash plate assembly along line AA of a preferred embodiment of the present invention;

[0050] Figure 6 A partial cross-sectional view of a swash plate assembly according to a preferred embodiment of the present invention;

[0051] Figure 7 This is a front view of a rotating body according to a preferred embodiment of the present invention;

[0052] Figure 8 It is a left side view of the rotating body of a preferred embodiment of the present invention;

[0053] Figure 9 AA sectional view of the rotating body of a preferred embodiment of the present invention;

[0054] Figure 10 A cross-sectional view of the rotating body BB of a preferred embodiment of the present invention;

[0055] Figure 11 A three-dimensional schematic diagram of a support base according to a preferred embodiment of the present invention Figure 1 ;

[0056] Figure 12 A three-dimensional schematic diagram of a support base according to a preferred embodiment of the present invention Figure 2 ;

[0057] Figure 13 This is a front view of a support base according to a preferred embodiment of the present invention;

[0058] Figure 14 This is a left side view of the support base of a preferred embodiment of the present invention;

[0059] Figure 15 A schematic diagram of the support base process of a preferred embodiment of the present invention;

[0060] Figure 16 This is a front view of a support sheet according to a preferred embodiment of the present invention;

[0061] Figure 17 A top view of a support sheet according to a preferred embodiment of the present invention;

[0062] Figure 18 A three-dimensional schematic diagram of a shift fork in a preferred embodiment of the present invention;

[0063] Figure 19 This is a front view of a shift fork in a preferred embodiment of the present invention;

[0064] Figure 20 A left sectional view of a shift fork according to a preferred embodiment of the present invention;

[0065] Figure 21 Schematic diagram of the support sheet blanking distribution of a preferred embodiment of the present invention. Implementation Method

[0066] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0067] See also Figures 1 to 21 The hydraulic control swash plate is mainly composed of a rotating body 1, a support seat 2, a screw 3, a pin 4, a support plate 5, a shift fork 6, a retaining ring 7, and a transmission pin 8;

[0068] The support piece 5 is provided on the support base 2, and the support piece 5 is limited in position by contacting the support base 2 through a plane and a circular arc. The support base 2 is provided on the rotating body 1, and the support base 2 is limited in position by contacting the rotating body 1 through a circular arc. The rotating body 1, the support base 2 and the support piece 5 are simultaneously positioned by the pin 4, and then the rotating body 1, the support base 2 and the support piece 5 are fastened together by the screw 3;

[0069] The shift fork 6 is provided on the rotating body 1. The shift fork 6 is limited in position by contacting the rotating body 1 through an arc, and the relative position between the shift fork 6 and the rotating body 1 is further limited by the pin 4, thereby fastening the shift fork 6 and the rotating body 1 into one body.

[0070] The transmission pin 8 is rotatably arranged on the shift fork 6 and is then limited by the retaining ring 7;

[0071] The swash plate in the assembled and used state has only one degree of freedom of rotation in one direction, and the other degrees of freedom are restricted. The load borne by the spherical surface on the rotating body 1 is borne by the swash plate in the used state, and the support plate 5 and the support seat 2 bear the counter-support force of the moment balance.

[0072] In this embodiment, the geometric elements provided on the rotating body 1 include a rotating body screw hole 11, a rotating body positioning hole 12, a rotating body right end surface 13, a rotating body outer circle 14, a rotating body spherical surface 15, a rotating body left end surface 16, a primary inner cavity 17, a secondary inner cavity 18, a retaining ring groove 19, a bearing inner cavity 110, and a rotating body shift fork positioning hole 111;

[0073] The main body of the rotating body 1 is formed by rotation about the axis of rotation of the rotating body outer circle 14. The internal and external rotating geometric elements of the rotating body 1 are coaxial with the axis of rotation of the rotating body outer circle 14. The inner cavity of the rotating body 1 is provided with a retaining ring groove 19, a bearing inner cavity 110, a primary inner cavity 17, and a secondary inner cavity 18 in sequence from the right end face 13 of the rotating body to the left end face 16 of the rotating body. The outer periphery of the rotating body 1 is provided with the rotating body outer circle 14 and the rotating body spherical surface 15 in sequence from the right end face 13 of the rotating body to the left end face 16 of the rotating body. A rolling bearing can be provided in the bearing inner cavity 110. The rolling bearing can be provided with a flat tray or a ball and socket tray. The flat end face of the flat tray is used to support the sliding shoe end face of the sliding shoe plunger. The end spherical socket surface of the ball and socket tray is used to support the spherical surface of the ball head plunger. The rolling bearing is limited by a retaining ring provided in the retaining ring groove 19. A boss is provided at the junction of the bearing inner cavity 110 and the first-level inner cavity 17 to axially position and load the rolling bearing. The first-level inner cavity 17 and the second-level inner cavity 18 are connected to each other and penetrate the rotating body 1. The geometric structure of the first-level inner cavity 17 and the second-level inner cavity 18 allows the rotating body 1 to avoid interference with the main shaft when rotating under variable control. The left end face 16 and the rotating body spherical surface 15 are intersected by an arc transition, the rotating body spherical surface 15 and the rotating body outer circle 14 are intersected by an arc transition, and the rotating body outer circle 14 and the rotating body right end face 13 are intersected by a chamfer transition. The intersecting arcs can avoid damage to the contact surface due to micro-deformation at the intersection when bearing and increase the running resistance. The rotating body outer circle 14 is aligned with the rotating axis of the rotating body 1. A rotating body screw hole 11 and a rotating body positioning hole 12 are provided. The axes of the rotating body positioning holes 12 symmetrically arranged on both sides are coaxial, and the axes of the rotating body positioning holes 12 are perpendicular to the axis of the rotating body 1. The two perpendicularly intersecting axes form a reference plane. Rotating body fork positioning holes 111 are also provided on other parts of the outer circle of the rotating body 14. The rotation axis of the rotating body fork positioning holes 111 is perpendicular to the reference plane. The center Y of the rotating body spherical surface 15 is located on the rotation axis of the outer circle of the rotating body 14, and the right end face 13 of the rotating body is located on one side of the center Y, and the center Y is not on the main body of the rotating body 1.

[0074] In this embodiment, the geometric elements provided on the support seat 2 include a support seat fastening arc surface 21, a support seat positioning hole 22, a support seat screw hole 23, a support seat outer circle 24, a support seat matching arc surface 25, a support seat end surface 26, a support seat receiving surface 27, a support seat receiving arc 28, a support seat limiting boss 29, and a support seat parting surface 210;

[0075] The rotation axes of the three are coaxial, and the center Z of the support seat is located on the common rotation axis of the three. On the main body of the support seat 2, the outer circle 24 of the support seat and the arc surface 25 of the support seat are external arc surfaces, and the arc 28 of the support seat is internal arc surface. The diameter of the arc 28 of the support seat is smaller than the diameter of the arc surface 25 of the support seat, and the diameter of the arc surface 25 of the support seat is smaller than the diameter of the arc surface 25 of the support seat. The diameter of the outer circle 24 of the seat, the outer circle 24 of the support seat and the arc surface 25 of the support seat are connected to form a support seat limiting boss 29, the plane where the support seat limiting boss 29 is located is perpendicular to the rotation axis of the support seat matching arc surface 25, and the plane perpendicular to the rotation axis of the support seat matching arc surface 25 cuts the support seat receiving arc 28 and the support seat matching arc surface 25 to form the support seat end face 26, the support seat receiving surface 27 sinks into the support seat receiving arc 28, and the support seat The plane where the supporting surface 27 is located is perpendicular to the rotation axis of the support seat supporting arc 28, and the plane where the supporting surface 27 and the supporting seat limiting boss 29 are located is on the same side of the supporting seat end face 26, and the supporting seat parting surface 210 of the cutting supporting seat 2 is parallel to the rotation axis of the supporting seat supporting arc 28. The rotation axis of the supporting seat supporting arc 28 after cutting is not on the entity of the supporting seat 2, and the rotation axis of the supporting seat fastening arc surface 21 formed after cutting the supporting seat 2 is perpendicular to the rotation axis of the supporting seat supporting arc 28. The entity vertical distance formed between the phase fixed point of the supporting seat fastening arc surface 21 and the supporting seat supporting surface 27 is greater than zero, and the supporting seat positioning hole 22 and the supporting seat screw hole 23 are perpendicular to the supporting seat supporting surface 27 and are arranged on the main body of the supporting seat 2, and then pass through the entity between the supporting seat fastening arc surface 21 and the supporting seat supporting surface 27. The diameter of the supporting seat fastening arc surface 21 is consistent with the diameter of the outer circle of the rotating body 14.

[0076] In this embodiment, the geometric elements provided on the support piece 5 include a support piece positioning arc 51, a support seat parting surface 52, a support piece receiving arc 53, a support piece positioning hole 54, a support piece screw hole 55, a support piece center 56, and a support piece positioning plane 57;

[0077] The rotation axis of the support piece positioning arc 51 and the rotation axis of the support piece receiving arc 53 are coaxial, and the support piece center 56 is located on the common rotation axis of the two. The two arcs form a common support piece center 56. The diameter of the support piece positioning arc 51 is smaller than the diameter of the support piece receiving arc 53. The support seat parting surface 52 is parallel to the rotation axis of the support piece positioning arc 51, and is symmetrical about the support piece positioning arc 51 and is arranged on both sides of the support piece positioning arc 51. The connecting intersection surface of the support piece positioning arc 51 and the support seat parting surface 52 is perpendicular to the support seat parting surface 52, thereby forming a complete support piece positioning arc 51. The entire semicircle, the support piece receiving arc 53 is smaller than the complete semicircle, and a support piece positioning hole 54 and a support piece screw hole 55 are provided on the support piece 5 formed on the plane where the support piece receiving arc 53 and the support seat parting surface 52 are located. Both sides of the support piece 5 are support piece positioning planes 57, and the two side surfaces are not distinguished when assembled. The diameter of the support piece receiving arc 53 is consistent with the diameter of the support seat receiving arc 28. The support piece screw hole 55, the support seat screw hole 23 and the rotating body screw hole 11 correspond to the same axis when assembled, and the support piece positioning hole 54, the support seat positioning hole 22 and the rotating body positioning hole 12 correspond to the same axis when assembled.

[0078] In this embodiment, the geometric elements provided on the shift fork 6 include a shift fork receiving body 61, a shift fork right rod 62, a shift fork left rod 63, a shift fork U-shaped cavity 64, a shift fork fastening arc surface 65, a shift fork positioning hole 66, a shift fork right pin hole 67, and a shift fork left pin hole 68;

[0079] The right fork rod 62, the left fork rod 63 and the fork receiving body 61 are connected to each other to form the fork 6 body, and then form a fork U-shaped cavity 64. The electrically controlled ball nut or the hydraulically controlled servo cylinder passes through the fork U-shaped cavity 64 and is located between the right fork rod 62 and the left fork rod 63. The right fork rod 62 is provided with a right pin hole 67 at the end away from the fork receiving body 61, and the left fork rod 63 is provided with a left pin hole 68 at the end away from the fork receiving body 61. A transmission pin 8 is respectively provided in the right pin hole 67 and the left pin hole 68 of the fork, and the axial movement of the transmission pin 8 is limited by the retaining ring 7. A transmission groove is respectively provided on the electrically controlled ball nut or the hydraulically controlled servo cylinder, and a part of the transmission pin 8 can be The rotation is set on the shift fork 6, and the other part is movably set in the transmission groove. The motor drives the screw to rotate and push the electronically controlled ball nut to move or the hydraulic oil pushes the hydraulic servo cylinder to move, and then drives the swash plate to rotate through the transmission pin 8. In this process, the transmission pin 8 moves laterally with the electronically controlled ball nut or the hydraulic servo cylinder while also moving longitudinally along the transmission groove to compensate for the relative position change caused by the rotation of the swash plate around the rotation axis X; a shift fork fastening arc surface 65 is provided on one side of the shift fork receiving body 61, and a shift fork positioning hole 66 is provided on the shift fork receiving body 61 on this side, and the diameter size of the shift fork fastening arc surface 65 is consistent with the diameter size of the outer circle 14 of the rotating body 1.

[0080] In this embodiment, the support piece 5 is positioned on the support seat 2 by contacting the support piece positioning plane 57 with the support seat receiving surface 27, and the support seat receiving arc 28 is in contact with the support piece receiving arc 53 for limiting, the support seat fastening arc surface 21 is in contact with the outer circle 14 of the rotating body for limiting, the rotation axes of the support piece positioning hole 54, the support seat positioning hole 22 and the rotating body positioning hole 12 are correspondingly coaxial, the rotation axes of the support piece screw hole 55, the support seat screw hole 23 and the rotating body screw hole 11 are correspondingly coaxial, and the pin 4 is simultaneously positioned with the rotating body positioning hole 12, the support seat positioning hole 22 and the support piece positioning hole 54, further limiting the relative freedom of the support piece 5, the support seat 2 and the rotating body 1, and the screw 3 passes through the support piece screw hole 55 and the support seat screw hole 23 and is screwed into the rotating body screw hole 11 for fastening;

[0081] The shift fork fastening arc surface 65 contacts and limits the outer circle 14 of the rotating body, and a portion of the pin shaft 4 is set in the shift fork positioning hole 66, and the other portion is set in the rotating body shift fork positioning hole 111 on the rotating body 1, thereby completing the full degree of freedom restriction of the shift fork 6 and the rotating body 1. The shift fork 6 and the rotating body 1 are welded and fixed, and a weld H is formed at the contact intersection line between the two.

[0082] After assembly is complete, the rotation axis of the support plate positioning arc 51 is coaxial with the rotation axis of the support seat matching arc surface 25. The rotation axes of the support plate positioning arcs 51 provided on the support plates 5 on both sides of the rotating body 1 are coaxial with the rotation axis X. The rotation axis X and the rotation axis of the rotating body 1 intersect perpendicularly, and the intersection of the two coincides with the center Y of the spherical surface 15 of the rotating body. The rotation axis X and the rotation axis of the rotating body 1 intersect to form a symmetry plane, and the right fork rod 62 and the left fork rod 63 are symmetrical about this symmetry plane.

[0083] After the swash plate is installed in the housing, the spherical surface 15 of the rotating body, the support seat limiting boss 29, the support seat matching arc surface 25, and the support piece positioning arc 51 are respectively contacted and limited with the housing, limiting the swash plate to rotate only around the rotation axis X.

[0084] See also Figures 1 to 21 The manufacturing method of the hydraulic control swash plate comprises the following specific steps:

[0085] Step 1: Perform normalizing heat treatment on the raw materials of the rotating body 1, the support seat 2, the support plate 5, the shift fork 6, and the transmission pin 8;

[0086] Step 2: Complete machining according to the designed geometric elements of the rotating body 1, support seat 2, support plate 5, shift fork 6, and transmission pin 8;

[0087] Step 3: Position and tighten the rotating body 1 and the shift fork 6;

[0088] Step 4: Position and tighten the rotating body 1, the support base 2 and the support plate 5;

[0089] Step 5: Install the transmission pin 8 onto the fork 6 and position it through the retaining ring 7.

[0090] In this embodiment, the machining of the rotating body 1 in step 2 is completed by a turning center through one-time clamping to ensure the positional accuracy between the various parts.

[0091] In this embodiment, in step 2, the machining of the support seat 2 first uses a dual-spindle turning center to single-head process all geometric elements except the support seat fastening arc surface 21 and the support seat parting surface 210. This machining includes the main bodies of the two support seats 2. The obtained support seat outer circle 24, support seat matching arc surface 25, and support seat receiving arc 28 are full-circumferential complete cylindrical surfaces, the obtained support seat end face 26 and support seat limiting boss 29 are full-circumferential complete circular rings, and the obtained support seat receiving surface 27 is a complete circular plane; after the dual-spindle turning center completes the single-head machining, the secondary shaft clamps the support seat outer circle 24 and reversely machines the support seat fastening arc surface 21. This machining also includes the main bodies of the two support seats 2; after the dual-spindle turning center completes the two-head machining, the two support seats 2 connected as one are cut apart from the middle to obtain two support seats 2.

[0092] In this embodiment, the support piece 5 is machined in step 2 by punching out the plate, and the punching arrangement adopts a reverse-end butt-jointing method to obtain the maximum utilization rate of the plate.

[0093] In this embodiment, in step 2, the machining of the shift fork 6 first uses a cutting method to obtain the main structure of the shift fork receiving body 61, the shift fork right rod 62 and the shift fork left rod 63, and obtains the shift fork U-shaped cavity 64 and the shift fork fastening arc surface 65. After the cutting is completed, the shift fork positioning hole 66, the shift fork right pin hole 67 and the shift fork left pin hole 68 are completed in one processing by a machining center.

[0094] In this embodiment, the rotating body 1 is contacted and positioned with the support seat 2, and the support seat 2 is contacted and positioned with the support plate 5, and the final positioning of the rotating body 1, the support seat 2 and the support plate 5 is completed by the pin shaft 4, and then the rotating body 1, the support seat 2 and the support plate 5 are fastened by the screw 3.

[0095] In this embodiment, the rotating body 1 is contacted and positioned with the shift fork 6 , and the final positioning of the rotating body 1 and the shift fork 6 is completed by the pin 4 , and then the rotating body 1 and the shift fork 6 are fastened together by welding.

[0096] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. Hydraulically controlled swash plate, including a rotating body, a support seat, screws, a pin shaft, a support plate, a shift fork, a retaining ring, and a transmission pin, characterized in that: The support piece is arranged on the support seat, and the support piece is limited by contacting the support seat through a plane and a circular arc. The support seat is arranged on the rotating body, and the support seat is limited by contacting the rotating body through a circular arc. The rotating body, the support seat and the support piece are positioned by a pin shaft at the same time, and then the rotating body, the support seat and the support piece are fastened together by screws; The shift fork is set on the rotating body, and the shift fork is limited by the contact with the rotating body through the arc, and the relative position between the shift fork and the rotating body is further limited by the pin shaft, thereby fastening the shift fork and the rotating body into one; The transmission pin is set on the shift fork and then limited by the retaining ring; The swash plate in the assembled and used state has only one degree of freedom of rotation in one direction, and the other degrees of freedom are restricted. The load borne by the swash plate in the used state is borne by the spherical surface on the rotating body, and the support plate and support seat bear the counter-support force of the moment balance; The support piece is positioned on the support seat through the contact between the support piece positioning plane and the support seat receiving surface, and the support seat receiving arc is in contact with the support piece receiving arc for limiting, the support seat fastening arc surface is in contact with the outer circle of the rotating body for limiting, the rotation axes of the support piece positioning hole, the support seat positioning hole and the rotating body positioning hole are coaxial, the rotation axes of the support piece screw hole, the support seat screw hole and the rotating body screw hole are coaxial, and the pin shaft is simultaneously positioned with the rotating body positioning hole, the support seat positioning hole and the support piece positioning hole to further limit the relative freedom of the support piece, the support seat and the rotating body, and the screw passes through the support piece screw hole and the support seat screw hole and is screwed into the rotating body screw hole for fastening; The shift fork fastening arc surface contacts and limits the outer circle of the rotating body, and a part of the pin shaft is set in the shift fork positioning hole, and the other part is set in the rotating body shift fork positioning hole on the rotating body, thereby completing the full degree of freedom restriction of the shift fork and the rotating body. The shift fork and the rotating body are welded and fixed, and a weld H is formed at the contact intersection line between the two; After assembly is completed, the rotation axis of the support plate positioning arc is coaxial with the rotation axis of the supporting seat matching arc surface. The rotation axes of the support plate positioning arcs on the support plates on both sides of the rotating body are coaxial with the rotation axis X. The rotation axis X and the rotation axis of the rotating body intersect perpendicularly, and the intersection of the two coincides with the center Y of the spherical surface of the rotating body. The rotation axis X and the rotation axis of the rotating body intersect to form a symmetry plane. The right and left levers of the shift fork are symmetrical about this symmetry plane. After the swash plate is installed in the box, the spherical surface of the rotating body, the support seat limiting boss, the support seat matching arc surface, and the support piece positioning arc are respectively contacted and limited with the box, limiting the swash plate to rotate only around the rotary axis X.

2. The hydraulic control swash plate according to claim 1, characterized in that: The geometric elements provided on the rotating body include a rotating body screw hole, a rotating body positioning hole, a rotating body right end face, an outer circle of the rotating body, a rotating body spherical surface, a rotating body left end face, a primary inner cavity, a secondary inner cavity, a retaining ring groove, a bearing inner cavity, and a rotating body shift fork positioning hole. The main body of the rotating body is rotationally formed about the rotation axis of the outer circle of the rotating body, and the inner and outer rotating geometric elements constituting the rotating body are coaxial with the rotation axis of the outer circle of the rotating body. The inner cavity of the rotating body is provided with a retaining ring groove, a bearing inner cavity, a primary inner cavity, and a secondary inner cavity in sequence from the right end face of the rotating body to the left end face of the rotating body. The outer periphery of the rotating body is provided with an outer circle of the rotating body and a spherical surface of the rotating body in sequence from the right end face of the rotating body to the left end face of the rotating body. The left end face and the spherical surface of the rotating body are intersected by an arc transition, the spherical surface of the rotating body and the outer circle of the rotating body are intersected by an arc transition, and the outer circle of the rotating body and the right end face of the rotating body are intersected by a chamfer transition. A rolling bearing may be provided in the bearing cavity, and a flat tray or a ball-and-socket tray may be provided on the rolling bearing. The flat end surface of the flat tray is used to support the sliding shoe end surface of the sliding shoe plunger, and the end spherical socket surface of the ball-and-socket tray is used to support the spherical surface of the ball head plunger. The rolling bearing is limited by a retaining ring provided in the retaining ring groove. A boss is provided at the junction of the bearing cavity and the primary cavity to axially position and load the rolling bearing. The primary cavity and the secondary cavity are connected to each other and penetrate the rotating body. The rotating body screw holes and the rotating body positioning holes are symmetrically arranged about the rotation axis of the rotating body on the outer circle of the rotating body. The axes of the rotating body positioning holes symmetrically arranged on both sides are coaxial, and the axes of the rotating body positioning holes are perpendicularly intersected with the axis of the rotating body. The two perpendicularly intersecting axes form a reference plane. The rotating body fork positioning holes are also provided at other parts of the outer circle of the rotating body. The rotation axis of the rotating body fork positioning holes is perpendicular to the reference plane. The center Y of the spherical surface of the rotating body is located on the rotation axis of the outer circle of the rotating body, the right end face of the rotating body is located on one side of the center Y, and the center Y is not on the main body of the rotating body.

3. The hydraulic control swash plate according to claim 1, characterized in that: The geometric elements arranged on the support seat include a support seat fastening arc surface, a support seat positioning hole, a support seat screw hole, a support seat outer circle, a support seat matching arc surface, a support seat end face, a support seat receiving surface, a support seat receiving arc, a support seat limiting boss, and a support seat parting surface. The rotation axes of the support seat outer circle, the support seat matching arc surface, and the support seat receiving arc are coaxial, and the center Z of the support seat is located on the common rotation axis of the three. The support seat outer circle and the support seat matching arc surface are external arc surfaces, and the support seat receiving arc is an internal arc surface. The diameter of the support seat receiving arc is smaller than the diameter of the support seat matching arc surface, and the diameter of the support seat matching arc surface is smaller than the diameter of the support seat outer circle. The outer circle of the support seat and the supporting arc surface intersect and connect to form a supporting seat limiting boss. The plane where the supporting seat limiting boss is located is perpendicular to the rotation axis of the supporting seat matching arc surface. The plane perpendicular to the rotation axis of the supporting seat matching arc surface cuts the supporting seat receiving arc and the supporting seat matching arc surface to form the supporting seat end face. The supporting seat receiving surface sinks into the supporting seat receiving arc, and the plane where the supporting seat receiving surface is located is perpendicular to the rotation axis of the supporting seat receiving arc. The plane where the supporting seat receiving surface and the supporting seat limiting boss are located are on the same side of the supporting seat end face. The support seat parting surface of the cutting support seat is perpendicular to the support seat supporting arc. The rotation axis of the receiving arc is parallel, and the rotation axis of the receiving arc of the support seat after cutting is not on the entity of the support seat. The rotation axis of the support seat fastening arc surface formed after cutting the support seat intersects perpendicularly with the rotation axis of the support seat receiving arc. The entity vertical distance formed between the phase fixed point of the support seat fastening arc surface and the support seat receiving surface is greater than zero. The support seat positioning hole and the support seat screw hole are arranged on the main body of the support seat perpendicular to the support seat receiving surface, and then penetrate the entity between the support seat fastening arc surface and the support seat receiving surface. The diameter of the support seat fastening arc surface is consistent with the diameter of the outer circle of the rotating body.

4. The hydraulic control swash plate according to claim 1, characterized in that: The geometric elements arranged on the support piece include a support piece positioning arc, a support seat parting surface, a support piece receiving arc, a support piece positioning hole, a support piece screw hole, a support piece center, and a support piece positioning plane. The rotation axis of the support piece positioning arc and the rotation axis of the support piece receiving arc are coaxial, the center of the support piece is located on the common rotation axis of the two, and the two arcs form a common support piece center. The diameter of the support piece positioning arc is smaller than the diameter of the support piece receiving arc. The support seat parting surface is parallel to the rotation axis of the support piece positioning arc and is symmetrical about the support piece positioning arc and is arranged on both sides of the support piece positioning arc. The connecting and intersecting surface of the support piece positioning arc and the support seat parting surface is perpendicular to the support seat parting surface, thereby forming a complete semicircular arc of the support piece positioning arc. The support piece receiving arc is smaller than the complete semicircular arc. A support piece positioning hole and a support piece screw hole are provided on the support piece formed on the plane where the support piece receiving arc and the support seat parting surface are located; Both sides of the support plate are support plate positioning planes, and the two sides are used indiscriminately during assembly. The diameter of the support plate receiving arc is consistent with the diameter of the support seat receiving arc. The support plate screw hole, support seat screw hole and rotating body screw hole are coaxial when assembled. The support plate positioning hole, support seat positioning hole and rotating body positioning hole are coaxial when assembled.

5. The hydraulic control swash plate according to claim 1, characterized in that: The geometric elements arranged on the shift fork include a shift fork receiving body, a shift fork right rod, a shift fork left rod, a shift fork U-shaped cavity, a shift fork fastening arc surface, a shift fork positioning hole, a shift fork right pin hole, and a shift fork left pin hole. The shift fork right rod, the shift fork left rod and the shift fork receiving body are connected to each other to form the shift fork body, and then form the shift fork U-shaped cavity. The shift fork right rod is provided with a shift fork right pin hole at the end away from the shift fork receiving body, and the shift fork left rod is provided with a shift fork left pin hole at the end away from the shift fork receiving body. A shift fork fastening arc surface is provided on one side of the shift fork receiving body, and a shift fork positioning hole is provided on the shift fork receiving body located on the side of the shift fork fastening arc surface. The diameter size of the shift fork fastening arc surface is consistent with the diameter size of the outer circle of the rotating body on the rotating body; the transmission pin can be rotatably arranged in the shift fork right pin hole and the shift fork left pin hole respectively, and the axial movement of the transmission pin is limited by the retaining ring.

6. The hydraulic control swash plate according to claim 5, characterized in that: The U-shaped cavity of the shift fork is located between the right rod and the left rod of the shift fork. An electrically controlled ball nut or a hydraulically controlled servo cylinder is arranged in the U-shaped cavity of the shift fork. A transmission groove is respectively provided on the electrically controlled ball nut or the hydraulically controlled servo cylinder. One part of the transmission pin is rotatably arranged on the shift fork, and the other part is movably arranged in the transmission groove. The motor drives the lead screw to rotate to push the electrically controlled ball nut to move, or the hydraulic oil pushes the hydraulically controlled servo cylinder to move, and then drives the swash plate to rotate through the transmission pin. In this process, the transmission pin moves horizontally with the electrically controlled ball nut or the hydraulically controlled servo cylinder, and moves longitudinally along the transmission groove to compensate for the relative position change caused by the rotation of the swash plate around the rotating axis X.

7. The method for manufacturing a hydraulic control swash plate according to claim 1, wherein: The process steps include: Step 1: Normalizing heat treatment of the raw materials of the rotating body, support seat, support plate, shift fork and transmission pin; Step 2: Complete machining according to the designed geometric elements of the rotating body, support seat, support plate, shift fork, and transmission pin; Step 3: Position and tighten the rotating body and the fork; Step 4: Position and tighten the rotating body, support seat and support plate; Step 5: Install the drive pin onto the fork and position it with the retaining ring.

8. The method for manufacturing a hydraulic control swash plate according to claim 7, wherein: In the second step, the machining of the rotating body is completed by a turning center in one clamping operation; In the step 2, the support piece is machined by punching the plate, and the punching arrangement adopts the reverse end butt-jointing method.

9. The method for manufacturing a hydraulic control swash plate according to claim 7, wherein: In the step 2, the support seat is first machined by a single-head dual-spindle turning center to process all geometric elements except the support seat fastening arc surface and the support seat parting surface. The machining includes the main bodies of the two support seats. The outer circle of the support seat, the supporting seat matching arc surface, and the supporting seat receiving arc are complete cylindrical surfaces in the entire circumference. The end face of the support seat and the supporting seat limiting boss are complete circular rings in the entire circumference. The supporting seat receiving surface is a complete circular plane. After the dual-spindle turning center completes the single-head machining, the secondary shaft clamps the outer circle of the support seat and processes the supporting seat fastening arc surface. The machining also includes the main bodies of the two support seats. After the dual-spindle turning center completes the two-head machining, the two support seats connected as one are cut apart from the middle to obtain two support seats.

10. The method for manufacturing a hydraulic control swash plate according to claim 7, wherein: In the step 2, the machining of the shift fork first uses a cutting method to obtain the main structure of the shift fork receiving body, the shift fork right rod and the shift fork left rod, and obtains the shift fork U-shaped cavity and the shift fork fastening arc surface. After the cutting is completed, the shift fork positioning hole, the shift fork right pin hole and the shift fork left pin hole are completed in one processing by a machining center.

11. The method for manufacturing a hydraulic control swash plate according to claim 7, wherein: The rotating body is contacted and positioned with the support seat, and the support seat is contacted and positioned with the support plate, and the final positioning of the rotating body, the support seat and the support plate is completed by the pin shaft, and then the rotating body, the support seat and the support plate are fastened by screws; The rotating body is contacted and positioned with the shift fork, and the final positioning of the rotating body and the shift fork is completed by the pin shaft, and then the rotating body and the shift fork are fastened together by welding.

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