Oscillating drive device

Abstract

The invention relates to a pivot drive (10) for a high-pressure cleaning device, comprising a motor shaft (20) which is mounted so as to be rotatable about an axis of rotation (18), and a pivot unit (22) which comprises a pivot body (32, 108, 118) and a pivot disc (34) between which a pivot disc bearing (44) is arranged, the pivot body (32, 108, 118) having a first contact surface (56, 110) which is spherically curved and having a second contact surface (60, 112). The pivoting body (32, 108, 118) can be connected to the motor shaft in a rotationally fixed manner by means of a screw connection (30) which can be pressed against the first contact surface (56, 110) in a planar manner. The second contact surface (60; 112) can be pressed against a fastening surface (71) associated with the motor shaft (20). In order to improve the pivot drive (10) in order to achieve simple assembly and production, it is proposed that the pivot body (32, 108, 118) be embodied as a one-piece solid component, the second contact surface (60, 112) being planar and arranged perpendicular to the rotational axis (18), and the pivot disc bearing (44) being supported on the support disc (50).

Description

Technical Field

[0001] The invention relates to an oscillating drive for a high-pressure cleaning device, comprising a motor having a motor shaft which is rotatably mounted about an axis of rotation, and a oscillating unit having a oscillating body and an oscillating plate which are rotatably driven about the axis of rotation, the end side of the oscillating plate being remote from the oscillating body being inclined relative to the axis of rotation, wherein a oscillating plate bearing is arranged between the oscillating body and the oscillating plate, wherein the oscillating body has a spherically curved first contact surface on a front side facing the oscillating plate, and a second contact surface on a rear side facing the motor shaft, wherein a central aperture extends from the first contact surface toward the second contact surface, and wherein the oscillating body can be connected to the motor shaft in a rotationally fixed manner by means of a screw connection, wherein the screw connection comprises a connecting screw which passes through the central aperture and whose longitudinal axis is oriented coaxially with the axis of rotation, wherein the screw connection can be pressed flatly against the first contact surface, and wherein the second contact surface can be pressed against a fixing surface which is designed flat and oriented perpendicularly to the axis of rotation and which is arranged directly on the motor shaft or on a component which is rotationally fixedly connected to the motor shaft. Background Art

[0002] According to DE 42 05 859 A1, a sway drive device is known, which includes a motor with a motor shaft rotatably supported around an axis of rotation and a sway unit. The sway unit includes a sway plate and a sway body formed from a sheet. The sway plate is supported on a support surface of the sway body by a sway plate bearing. This sway drive device is used for an axial piston pump to convert the rotational motion of the motor shaft into a reciprocating motion of a piston abutting against the end side of the sway plate. With the help of the piston, liquid, preferably water, can be periodically sucked in, pressurized and discharged through a pressure line. If the delivery capacity of the axial piston pump should be changed, the piston stroke can be changed by changing the inclination of the sway plate. The greater the inclination of the sway plate relative to the axis of rotation, the greater the piston stroke.

[0003] If the piston stroke is now to be changed, this can be achieved by tilting the pendulum, which has a spherically curved contact surface on its rear side facing the motor shaft. The piston stroke can thus be adjusted and a pendulum of a single design can be used for axial piston pumps with different delivery capacities. The inclination of the pendulum must be adjusted during assembly and subsequently checked, which complicates the assembly process.

[0004] The design of the oscillating body as a sheet metal component requires reshaping processes and reprocessing, for example in the form of heat treatment, during production. The heat treatment results in hardening of the support surface on which the sway plate bearing rests. This is necessary to achieve wear resistance of the oscillating body. The production of the oscillating drive requires different production steps, which complicates production. Summary of the invention

[0005] The object of the present invention is to provide a pivot drive of the type mentioned above which is simple to assemble and produce.

[0006] This object is achieved according to the invention in a swivel drive of this type in that the swivel body is embodied as a one-piece solid component, wherein the second contact surface is designed to be flat and oriented perpendicular to the axis of rotation, and the swivel plate bearing is supported on a support plate that can be connected to the swivel body and abuts against a support surface of the swivel body oriented parallel to the end side of the swivel plate.

[0007] In the swing drive device according to the present invention, the swing body is designed as a one-piece solid component. Due to the integrity of the swing body, it can be manufactured in one step. Similarly, it is not necessary to assemble different components into a swing body. Therefore, the manufacturing steps can be reduced.

[0008] The swing plate bearing is supported on the support plate, which abuts against a support surface of the swing body that is oriented parallel to the end side of the swing plate. The surface on which the swing plate bearing is supported is subjected to strong mechanical loads and is formed by the support plate according to the invention. Mechanical wear of the surface on which the swing plate bearing is supported can be offset, for example, by selecting a hard material for the support plate or by means of heat treatment (by means of which the upper surface of the support plate is hardened). Since the swing plate bearing is supported on the support plate, rather than directly on the support surface of the swing body, there is no need for further processing of the swing body, for example by means of heat treatment to harden the support surface. This reduces the manufacturing complexity of the swing body.

[0009] The second contact surface of the oscillating body is of planar design and is arranged perpendicular to the axis of rotation. The support surface of the oscillating body, which is oriented parallel to the end side of the oscillating plate, results in an angle of inclination between the support surface and the second contact surface, which determines the piston stroke of the piston that can reciprocate, is arranged parallel to the axis of rotation and abuts against the end surface of the oscillating plate. The second contact surface can be pressed against a planar fixing surface of the motor shaft or a component that is connected to the motor shaft in a non-rotatable manner and is oriented perpendicular to the axis of rotation on the motor shaft side. The planar second contact surface oriented perpendicular to the axis of rotation and the planar fixing surface oriented perpendicular to the axis of rotation allow for very simple assembly of the oscillating body, whose geometry determines the piston stroke. Therefore, it is not necessary to adjust and check the angle of inclination during assembly.

[0010] The oscillating body has a front side and a rear side. A first contact surface with a spherical curvature is arranged on the front side of the oscillating body, and a second contact surface with a planar design and oriented perpendicular to the motor shaft is arranged on the rear side, which can be pressed against a planar fixing surface oriented perpendicular to the motor shaft. The bolt connection device (with which the oscillating body can be connected to the motor shaft in a rotationally fixed manner) can be pressed against the first contact surface in a planar manner. The spherically curved first contact surface allows the bolt connection device to be flat against the first contact surface regardless of the inclination angle, thereby allowing a uniform force distribution of the bolt connection device along the first contact surface and the second contact surface to the fixing surface and then to the motor shaft. The center point of the sphere forming the first contact surface is defined by the intersection of the axis of rotation and the end side of the oscillating plate. It can thus be ensured that the oscillating plate is centered relative to the axis of rotation regardless of the inclination angle. The planar second contact surface allows a simple geometric design of the rear side of the oscillating body.

[0011] Preferably, the spherically curved first contact surface is designed to be concave.

[0012] Depending on the desired piston stroke, in the oscillating drive device of the present invention, a oscillating body having a piston stroke corresponding to the tilt angle between the support surface and the second contact surface is used. Therefore, different oscillating bodies are characterized only by different tilt angles, but the front side of the oscillating body can remain the same for all tilt angles, and only the tilt angle of the planar second contact surface relative to the support surface needs to be changed. Therefore, the design of oscillating bodies with different tilt angles becomes very simple.

[0013] In order to make the production of the rocking body particularly simple, the rocking body can preferably be produced by means of a mold which comprises at least one molded part.

[0014] Advantageously, the mold comprises a first molded part and a second molded part. The front side of the swinging body can be molded by means of the first molded part. The rear side of the swinging body can be molded by means of the second molded part. Due to the first contact surface designed as a spherical arch, only the geometrically simple rear side and thus the second molded part need to be matched for swinging bodies with different inclination angles. Thus, the first molded part that molds the front side of the swinging body can remain the same for all required inclination angles. Accordingly, a simple production of swinging bodies with different inclination angles is achieved under simple assembly conditions.

[0015] Preferably, the oscillating body is a cast part, thereby enabling particularly simple and inexpensive production.

[0016] Particularly preferably, the rocker body is an aluminum die-casting. The aluminum die-casting process makes it possible to obtain a particularly dimensionally accurate component with good surface quality, wherein further processing can be omitted.

[0017] Advantageously, the swash plate bearing is designed as a rolling bearing.

[0018] Preferably, the oscillating body has at least one centering element, which is used to center the support plate relative to the oscillating body. This simplifies the precise positioning of the support plate on the oscillating body.

[0019] Advantageously, at least one centering element is formed as a form-fitting element, wherein the support disk can be connected to the rocking body in a rotationally fixed manner by means of the form-fitting element. The support disk can be connected to the rocking body, for example, by means of a press fit.

[0020] In an advantageous embodiment of the invention, the screw connection is designed in one piece in the form of a connecting screw, which has a screw head that bears flat against the first contact surface. The screw head is shaped according to the curved first contact surface of the spherical surface, so that a uniform force distribution is achieved from the connection along the first contact surface and the second contact surface to the fastening surface and thus to the motor shaft.

[0021] Alternatively, the bolt connection can be designed in two parts and include a connecting bolt and a washer, wherein the washer bears flat against the first contact surface. This allows a standard bolt to be used as a connecting bolt. In combination with the washer surface designed according to the spherical curvature of the first contact surface and facing the first contact surface, a uniform force distribution from the connecting device along the first contact surface and the second contact surface to the fastening surface and thus to the motor shaft can be achieved.

[0022] Advantageously, in addition to the screw connection, the oscillating body can also be connected to the motor shaft by means of a form-fitting connection. This achieves a rotationally fixed connection between the oscillating body and the motor shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following description of the preferred embodiments of the present invention is used to further illustrate the invention in conjunction with the accompanying drawings. In the drawings:

[0024] Figure 1 A sectional view of a high-pressure cleaning device with a first embodiment of a pivot drive is shown;

[0025] Figure 2 Show according to Figure 1 A magnified view of detail X;

[0026] Figure 3 Show according to Figure 1 A perspective view of the swivel unit of the swivel drive device tilted from the rear;

[0027] Figure 4 Shown along the basis Figure 3 A cross-sectional view of the swing unit along line 4-4;

[0028] Figure 5 Show according to Figure 1 A perspective view of the swing body of the swing drive device tilted from the front;

[0029] Figure 6The second embodiment of the swing drive is shown based on Figure 4 A cross-sectional view of

[0030] Figure 7 The third embodiment of the swivel drive is shown based on Figure 4 A cross-sectional view of

[0031] Figure 8 The fourth embodiment of the swing drive is shown based on Figure 2 A magnified view of

[0032] Fig. 9 Show according to Figure 8 A perspective view of the swivel unit of the swivel drive device tilted from the rear;

[0033] Fig.10 Shown along the basis Fig. 9 A cross-sectional view of the swing unit along line 10-10. DETAILED DESCRIPTION

[0034] exist Figures 1 to 5 A first embodiment of an oscillating drive 10 according to the invention for a high-pressure cleaning appliance is shown schematically and is denoted in its entirety by the reference numeral 10 .

[0035] The high-pressure cleaning device comprises an axial piston pump 12 with a piston 14, which is driven by a swivel drive 10. The swivel drive 10 comprises a motor 16 with a motor shaft 20 rotatably mounted about an axis of rotation 18, and a swivel unit 22. The rotatable mounting of the motor shaft 20 is implemented by means of a ball bearing 24, which has an inner ring 26 connected to the motor shaft 20 in a rotationally fixed manner and an outer ring 29 connected to a housing 28 in a rotationally fixed manner.

[0036] The swivel unit 22 comprises a swivel body 32 connected to the motor shaft 20 by means of a screw connection 30 and a swivel plate 34 of planar annular design, against which the piston 14 of the axial piston pump 12 rests in an elastic manner by means of a piston spring 38 on an end side 36 of the swivel plate 34 facing away from the swivel body 32 .

[0037] The screw connection 30 is designed as a connecting screw 40. The longitudinal axis 42 of the connecting screw 40 is oriented coaxially with the rotation axis 18. A swivel plate bearing 44 is arranged between the swivel plate 34 and the swivel body 32. The swivel plate bearing 44 includes a spherical rolling body 46 and a bearing cage 48 surrounding the rolling body 46. The swivel plate bearing 44 is supported on a support plate 50 connected to the swivel body 32. The support plate 50 is designed in an annular shape and flatly abuts against a support surface 51 of the swivel body 32 (which is parallel to the end side 36 of the swivel plate 34).

[0038] The swing body 32 includes a front section 52 extending from the support surface 51 toward the swing plate 34, and a rear section 53 extending from the support surface 51 toward the motor shaft 20. The support surface 51 divides the swing body 32 into the front section 52 and the rear section 53.

[0039] The oscillating body 32 has a first contact surface 56 which is curved inwardly spherically on the front side 54 facing the oscillating plate 34 and arranged on the front section 52, and a second contact surface 60 which is designed flat and oriented perpendicularly to the axis of rotation 18 on the rear side 58 facing the motor shaft 20 and arranged on the rear section 53. The central opening 62 extends from the first contact surface 56 to the second contact surface 60. The connecting screw 40 comprises a screw head 64 and a threaded rod 66. The threaded rod 66 passes through the central opening 62 and is screwed into a central threaded hole 68 arranged on the end side 70 of the motor shaft 20, which is oriented coaxially with the axis of rotation 18. The screw head 64 is complementary in design to the first contact surface 56 and bears against the first contact surface 56 in a planar manner. The second contact surface 60 bears against a fixing surface 71 which is designed flat and oriented perpendicularly to the axis of rotation 18 and is formed by an end surface 72 of the inner ring 26 of the radial single-row deep groove ball bearing 24 which faces the oscillating body 32. The support surface 51 of the swivel body 32 , which is arranged parallel to the end face 36 of the swivel plate 34 , forms an inclination angle α with respect to the second contact surface 60 .

[0040] like Figure 5 As shown, the oscillating body 32 has centering elements 73 on its front side 54, which in turn form positive locking elements 74 and extend parallel to the axis of rotation 18 in the direction of the oscillating disk 34. The inner edge 76 of the annular support disk 50 bears against the outer surface 75 of the positive locking elements 74.

[0041] On the front section 52, the swing body 32 has a first mounting element 78 and a second mounting element 80 arranged offset in the circumferential direction relative to the first mounting element 78. These mounting elements 78, 80 each include blades 82, 84 and blade edges 86, 88. The blades 82, 84 extend perpendicularly to the support surface 51 in the direction toward the swing disk 34. The blade edges 86, 88 extend radially outward from the support surface 51.

[0042] The swing drive 10 can be assembled as follows:

[0043] First, the support disc 50 is pressed onto the oscillating body 32, so that the outer surface 75 of the form-locking element 74 abuts the inner edge 76 of the support disc 50, and the support disc 50 abuts the support surface 52 of the oscillating body 32. Next, the swivel disc bearing 44 is placed on the support disc 50. Subsequently, the swivel disc 34 is positioned on the swivel disc bearing 44. In order to prevent the swivel unit 22 from falling off during the installation process, the swivel disc bearing 44 and the swivel disc 34 can be pressed against the blades 82, 84 of the mounting elements 78, 80. In the next assembly step, the outer surfaces 90, 92 of the blade edges 86, 88, which are oriented parallel to each other, can be clamped by means of an installation tool. The swivel unit 22 is now in place and screwed to the motor shaft 16 by means of the connecting screw 40. By the screw head 64 abutting the first contact surface 56 in a planar manner, the oscillating body 32 is tensioned with its second contact surface 60 relative to the fixing surface 71 and is thus connected to the motor shaft 20 in a rotationally fixed manner.

[0044] Figure 6 The swivel unit of the second embodiment of the swivel drive according to the present invention is schematically shown. Here, the swivel unit of the second embodiment is identical to the swivel unit 22 of the first embodiment. In the second embodiment, the bolt connection device 30 is implemented in two parts and comprises a connecting bolt 94 and a washer 96. The connecting bolt 94 comprises a bolt head 98 and a screw 100. The washer 96 is arranged between the bolt head 98 and the swivel body 32 and is penetrated by the screw 100 like the central opening 62 of the swivel plate 32. The longitudinal axis 102 of the connecting bolt 94 is arranged coaxially with the axis of rotation 18. The washer 96 is flat on the front side 104 facing the bolt head 98 and is spherically curved on its rear side 106 away from the bolt head 98.

[0045] Figure 7 The third embodiment of the wobble unit of the wobble drive according to the invention is schematically shown. The third embodiment differs from the first and second embodiments in the geometry of the wobble body.

[0046] In the third embodiment of the oscillating drive, a oscillating body 108 corresponding to the oscillating body 32 of the first embodiment is used. The oscillating body 108 has a first contact surface 110 of spherical arcuate design, a second contact surface 112 of planar design and arranged perpendicular to the axis of rotation 18, and a support surface 113 oriented parallel to the end side of the oscillating plate 34. The first contact surface 110 is arranged on a front section 114 of the oscillating body 108 extending from the support surface 113 in the direction of the oscillating plate 34. The second contact surface 112 is arranged on a rear section 115 of the oscillating body 108 extending from the support surface 113 in the direction of the motor shaft 20. The front section 114 and the rear section 115 are separated by the support surface 113.

[0047] The bolt head 64 of the connecting bolt 40 can be pressed against the first contact surface 110 in a planar manner. The second contact surface 112 abuts against the fixing surface 71. The support plate 50 abuts against the support surface 113 of the swing body 108 in a planar manner. The swing plate 34 is supported on the support plate 50 by the swing plate bearing 44. The support surface 113 and the second contact surface 112 form an inclination angle β with each other. The inclination angle β of the third embodiment is smaller than the inclination angle α of the first and second embodiments.

[0048] The front section 114 of the third embodiment of the pivot drive is identical to the front section 52 of the first and second embodiments, while the rear section 115 differs from the rear section 53 of the first and second embodiments only by the inclination angle β.

[0049] Figures 8 to 10 A fourth embodiment of the oscillating drive according to the invention is schematically shown. The fourth embodiment corresponds approximately to the first and second embodiments in terms of the shape of the oscillating body. In the fourth embodiment, a oscillating body 118 is used, which has a deepening 120 on its rear side 58 facing the motor shaft 20. The deepening 120 has a planar first side surface 122 and a planar second side surface 124 opposite the first side surface 122, which are connected to each other by a rounded third side surface 126 and a rounded fourth side surface 128. A motor shaft end section 130 corresponding to the shape of the deepening 120 can be introduced into the deepening 120. This serves to prevent relative rotation between the oscillating body 118 and the motor shaft 20.

Claims

1. A swivel drive device for a high-pressure cleaning device, the swivel drive device comprising a motor (16) having a motor shaft (20) rotatably supported about a rotation axis (18), and a swivel unit (22) having a swivel body (32; 108; 118) rotatably driven about the rotation axis (18) and a swivel plate (34), the end side (36) of the swivel plate remote from the swivel body (32; 108; 118) being inclined relative to the rotation axis (18), wherein: A swivel plate bearing (44) is arranged between the swivel body (32; 108; 118) and the swivel plate (34), wherein the swivel body (32; 108; 118) has a spherically curved first contact surface (56; 110) on a front side (54) facing the swivel plate (34) and a second contact surface (60; 112) on a rear side (58) facing the motor shaft, wherein a central aperture (62) extends from the first contact surface (56; 110) toward the second contact surface (60; 112), and wherein the swivel body (32; 108; 118) can be connected to the motor shaft (20) in a rotationally fixed manner by means of a screw connection (30), wherein the screw connection (30) comprises a connecting screw (40; 94) extending through the central aperture (62), the longitudinal axis (42; 102) of the connecting screw being oriented coaxially with the axis of rotation (18). , wherein the screw connection (30) can bear flat against the first contact surface (56; 110), and wherein the second contact surface (60; 112) can bear against a fixing surface (71) of planar design and oriented perpendicularly to the rotation axis (18), the fixing surface being arranged directly on the motor shaft (20) or on a component connected to the motor shaft in a rotationally fixed manner, characterized in that the swing body (32; 108; 118) is embodied as a one-piece solid component, wherein the second contact surface (60; 112) is of planar design and oriented perpendicularly to the rotation axis (18), and the swing plate bearing (44) is supported on a support plate (50) that can be connected to the swing body (32; 108; 118), the support plate bearing against a support surface (51; 113) of the swing body (32; 108; 118) being oriented parallel to the end side (36) of the swing plate (34).

2. The swing drive device according to claim 1, characterized in that: The swinging body (32; 108; 118) is a casting.

3. The oscillating drive device according to any one of the preceding claims, characterized in that The swash plate bearing (44) is designed as a rolling bearing.

4. The oscillating drive according to any one of the preceding claims, characterized in that The oscillating body (32; 108; 118) has at least one centering element (73) which serves to center the support plate (50) relative to the oscillating body (32; 108; 118).

5. The swing drive device according to claim 4, characterized in that: The at least one centering element (73) forms a positive locking element (74), wherein the support disk (50) can be connected to the rocker body (32; 108; 118) in a rotationally fixed manner by means of the positive locking element (74).

6. The oscillating drive according to any one of the preceding claims, characterized in that The screw connection (30) is designed in one piece in the form of a connecting screw (40) having a screw head (64) which bears flat against the first contact surface (56; 110).

7. The swing drive device according to any one of claims 1 to 5, characterized in that: The screw connection (30) is designed in two parts and comprises a connecting screw (94) and a washer (96), wherein the washer (86) bears flatly against the first contact surface (56; 110).

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