Rotary transmission arrangement, device for converting a rotary motion into a linear motion and motor

Abstract

Rotary transmission arrangement (10) comprising: a housing (1) having a bearing surface (11) which carries at least one bearing (4); a hollow shaft (2) which is / will be rotatably coupled to the housing (1) about a first axis of rotation (A1), wherein the hollow shaft (2) has at least one externally rotating stepped shaft section (21A, 21B) and at least one internally rotating stepped shaft section (22); a rod link (3) which is / will be rotatably coupled to the housing (1) about the first axis of rotation (A1), comprising at least one contact section (31) and at least one projecting part (32), wherein the at least one contact section (31) touches at least a part of the hollow shaft (2) in a radial direction and the at least one projecting part (32) abuts the at least one internally rotating stepped shaft section (22) in an axial direction; wherein the at least one bearing (4) comprising at least one circular inner support part (41A, 41B) and at least one circular outer support part (42) supports the hollow shaft (2) and the rod link (3) rotatably against the housing (1) about the first axis of rotation (A1), wherein the at least one circular inner support part (41A, 41B) abuts at least a part of the at least one outer stepped shaft section (21A) in an axial direction and the at least one circular outer support part (42) abuts the bearing surface (11) of the housing (1) in the axial direction; and a stop member (5) which is / will be fixed to the rod member (3), wherein the stop member (5) abuts the at least one circular inner support part (41B) in the axial direction.

Description

[0001] The invention essentially relates to a rotary transmission arrangement, a device for converting a rotary motion into a linear motion, and a motor. More specifically, the present invention relates to a rotary transmission arrangement, a device for converting a rotary motion into a linear motion, and a motor, which provide a secure positioning of axially and radially stressed components in an axial and a radial direction.

[0002] A known device type for converting the rotary motion of a motor into a linear motion includes a conventional ball nut for transmitting the rotary motion of a rod link into a linear motion, wherein the ball nut is movably arranged on the rod link. Since the ball nut moves back and forth on the rod link, the bearings supporting the rod link relative to a housing are subjected to high axial and radial loads.

[0003] An example of a device for converting a rotary motion into a linear motion is disclosed in JP 4722247 B2. However, JP 4722247 B2 discloses a conventional bearing arrangement for rotary support of the rotating section on the stationary section (i.e., housing), wherein the components for supporting the rotating section on the stationary section can easily detach due to the high axial and radial loads.

[0004] US 6 349 801 B1 discloses an electromechanically actuated disc brake.

[0005] One aspect of the present invention is to improve the secure positioning of loaded components in a rotary transmission arrangement in both axial and radial directions. Another aspect of the present invention is to reduce axial impact. A further aspect of the present invention is to prevent rod link movement in the axial direction of the rotary transmission arrangement.

[0006] In consideration of the known technology and according to a first aspect of the present invention, a rotary transmission arrangement is provided, comprising essentially a housing, a hollow shaft, a rod link, at least one bearing, and a stop element. The hollow shaft is rotatably coupled to the housing about a first axis of rotation. The hollow shaft has at least one externally rotating stepped shaft section and at least one internally rotating stepped shaft section. The rod link is rotatably coupled to the housing about the first axis of rotation and has at least one contact section and at least one projecting portion. The at least one contact section touches at least a portion of the hollow shaft in a radial direction, and the at least one projecting portion abuts or strikes the at least one internally rotating stepped shaft section in a radial direction.The at least two contact points are preferably arranged close to each other, but they can also be spaced apart. The at least one bearing comprises at least one circular inner support part and at least one circular outer support part, which rotatably support the hollow shaft and the rod link against the housing about the first axis of rotation. The at least one circular inner support part abuts or strikes at least a portion of the at least one outer stepped shaft section in the axial direction, and the at least one circular outer support part abuts or strikes a bearing surface of the housing in the axial direction. The stop element is fixed to the rod link, and the stop element abuts or strikes at the at least one circular inner support part in the axial direction.

[0007] Since the stop element accommodates at least one circular inner support part of the bearing, and at least one outer stepped shaft section accommodates the other circular inner support part of the bearing, the axial runout is reduced. This axial fixing arrangement further prevents movement of the rod link in an axial direction.

[0008] Preferably, the rotary transmission arrangement further comprises a circular bearing retainer element which is fixed to an inner surface of an opening section of the housing and is designed to abut at least a portion of the at least one circular outer support element in the axial direction. This further enables secure fixing and positioning of the bearing in an axial direction.

[0009] Preferably, the rotary transmission arrangement is designed such that the outer diameter of the circular bearing retainer is larger in a radial direction than the outer diameter of the at least one circular outer support element. This enables secure fixing and positioning of the bearing in an axial direction.

[0010] Preferably, the rotary transmission arrangement is designed such that the circular bearing retainer includes at least one sealing element. This ensures a reliable seal.

[0011] Preferably, the rotary transmission arrangement is designed such that the circular bearing retainer is securely fixed to the inner surface of the opening section of the housing; in particular, at least a part of the circular bearing retainer is pressed, squeezed, or crimped onto at least a part of the opening section, and a deformed section is formed. Therefore, the circular bearing retainer securely locks the bearing.

[0012] Preferably, the rotary transmission arrangement is configured such that the circular bearing retainer has a concave section on an upper surface and a convex section on a lower surface, wherein the concave section has a tool engagement hole, and wherein the convex section on the lower surface of the circular bearing retainer is arranged in a deeper axial direction than the deformed section. This arrangement allows the load from the compression / deformation to dissipate to the convex section of the circular bearing retainer. With this structure, the circular bearing retainer is securely fixed to the housing. This structure is an effective bearing fixing arrangement.Since the circular bearing retainer engages / engages with the inner surface of the opening section of the housing via a thread and / or is pressed onto at least part of the opening section to form the deformed section, this structure exhibits a high degree of flexibility with respect to dimensional tolerances of the bearing and / or the housing.

[0013] Preferably, the rotary transmission arrangement is designed such that the housing has at least one stepped housing section, wherein the at least one bearing is arranged where an axial end face of the at least one bearing is positioned between the outer surface of the at least one stepped housing section and the inner surface of the at least one stepped housing section. With this structure, sufficient housing thickness is provided to secure the bearing in a radial direction.

[0014] Preferably, the rotary transmission arrangement is configured such that the at least one bearing is a four-point contact bearing, wherein the circular inner support part has a lower inner support part and an upper inner support part, the lower inner support part abutting or striking the at least one outer stepped shaft section, and the upper inner support part abutting or striking the stop element. Since the stop element receives the lower inner support part of the bearing and the at least one outer stepped shaft section receives the lower inner support part of the bearing, the axial runout is reduced. This axial locking arrangement further allows the rod link movement to be changed in an axial direction. The circular outer support part can also comprise two separate support parts, i.e., an upper outer support part and a lower outer support part.

[0015] Preferably, the rotary transmission arrangement is configured such that at least one section of the hollow shaft corresponds to the shape of the at least one contact section of the rod link, wherein the at least one contact section of the rod link can have a shape other than a circular one; in particular, the at least one contact section of the rod link can have a polygonal shape, an elliptical shape, or a shape with a concave section and / or a convex section. This rotary transmission structure transmits the rotation of the hollow shaft to the rod link.

[0016] According to a further aspect of the present invention, a device for converting a rotary motion into a linear motion is provided, which essentially comprises a housing, a stator, a hollow shaft, several magnets, a rod element, at least one bearing, a stop element, and a ball nut. The stator with several coils is arranged in a circumferential direction, the stator being arranged on a cylindrical section of the housing. The hollow shaft is rotatably coupled to the housing about a first axis of rotation, the hollow shaft having at least one externally rotating stepped shaft section and at least one internally rotating stepped shaft section. Several magnets are arranged on an outer circumferential surface of the hollow shaft inwards and / or internally from the stator in a radial direction.The connecting rod is rotatably coupled to the housing about the first axis of rotation and comprises at least one contact section and at least one projecting section, wherein the at least one contact section touches at least a portion of the hollow shaft in a radial direction and the at least one projecting section abuts the at least one internally rotating stepped shaft section in an axial direction. The at least one bearing comprises at least one circular inner support member and at least one circular outer support member, which rotatably support the hollow shaft and the connecting rod to the housing about the first axis of rotation. The at least one circular inner support member abuts at least a portion of the at least one externally rotating stepped shaft section in the axial direction, and the at least one circular outer support member abuts a bearing surface of the housing in the axial direction.The stop link is fixed to the rod link, with the stop link abutting at least one circular inner support element in the axial direction. The ball nut is rotatably supported on helical grooves or helical slots on an outer circumferential periphery of the rod link, the ball nut moving in the axial direction of the first axis of rotation corresponding to the rotation of the rod link.

[0017] Since the ball nut moves back and forth in an axial direction, the bearing is subjected to high loads in the axial direction of the rod link. Because the stop element engages one of the circular inner support elements of the bearing, and at least one outer stepped shaft section engages the other of the circular inner support elements, the axial runout is reduced. This axial locking arrangement further prevents the rod link movement in an axial direction.

[0018] According to a further aspect of the present invention, a motor is provided which essentially comprises a device for converting a rotary motion into a linear motion according to one of the preceding aspects of the present invention. This motor can exert sufficient force in both the radial and axial directions to counter the force of the hollow shaft and the rod link.

[0019] Preferably, the motor is designed as a brake system motor. In a brake system, this motor is used to vary the pressure of a brake booster to which the ball nut is mounted. Furthermore, smooth and rapid pressure changes are necessary for safe and comfortable driving. Additionally, the ball nut requires a responsive forward and backward movement, and the bearing is subjected to high axial loads due to this movement.

[0020] The advantages of the present invention can be summarized as follows: a. The stability of the fixation and positioning of the loaded component is increased in the axial and radial directions. b. The axial impact is reduced. c. The movement of the rod link in the axial direction is prevented.

[0021] Further advantages that can be achieved with the embodiments of the present invention are summarized as follows: d. The circular bearing retainer securely locks or secures the bearing. This structure is an effective bearing fixing arrangement. e. The structure exhibits a high degree of flexibility with regard to the dimensional tolerances of the bearing and / or the housing. f. Sufficient housing thickness is provided to hold the bearing in a radial direction. g. The rotary transmission structure transmits the rotation of the hollow shaft to the rod link. h. The motor can provide sufficient strength to counter the force of the hollow shaft and the connecting rod in both the radial and axial directions.

[0022] Other tasks, features, aspects and advantages of the disclosed rotary transmission arrangement, the device for converting the rotary motion into a linear motion and the motor will also become apparent to a person skilled in the art from the following detailed description. Summary of the characters

[0023] The invention will now be described with reference to the figures. It should be understood that the embodiments and aspects of the present invention described in the figures are merely examples and do not limit the scope of the claims in any respect. The invention is defined by the claims and their equivalents. It should be understood that the features of one aspect or embodiment of the invention can be combined with a feature of a different aspect or aspects of other embodiments of the present invention. This invention will become apparent upon study of the following detailed descriptions of the embodiments, which form part of this disclosure, and consideration of the accompanying drawings. Referring now to the accompanying drawings, which form part of this disclosure: Fig. Figure 1 is a cross-sectional view of a rotary transmission arrangement according to a first embodiment, and of a device for converting a rotary motion into a linear motion according to a second embodiment; Fig. Figure 2 shows an enlarged cross-sectional view of the rotary transmission arrangement illustrated in Fig. 1; Fig. 3A is a partial cross-sectional view of a hollow shaft and a rod link of the rotary transmission arrangement, as along the section line X - X' of Fig. 2 can be seen, with the rod link having an elliptical shape; Fig. 3B is a partial cross-sectional view of the hollow shaft and rod link of the rotary transmission assembly, as along the section line X - X' of Fig. 2 can be seen, where the rod link has a convex section containing a shape; Fig. 3C is a partial cross-sectional view of the hollow shaft and rod link of the rotary transmission assembly, as along the section line X - X' of Fig. 2 can be seen, with the rod link having a polygonal shape; and Fig. 3D is a partial cross-sectional view of the hollow shaft and rod link of the rotary transmission assembly as along the section line X - X' of Fig. 2 can be seen, where the rod link has a concave section containing a shape. Detailed description

[0024] The object of the present invention is fully described below by means of examples for the purpose of disclosure, without limiting the disclosure by the examples mentioned. The examples represent different aspects of the present disclosure. To implement the present technical teaching, it is not necessary to implement all of these aspects in combination. Rather, a person skilled in the art will select and combine those aspects that appear useful and are required for the respective application and implementation.

[0025] Firstly, referring to Fig. A rotary transmission arrangement 10 according to a first embodiment is illustrated. The rotary transmission arrangement 10 comprises a housing 1, a hollow shaft 3, a rod link 3, at least one bearing 4, and a stop link 5. The hollow shaft 2 is rotatably coupled to the housing 1 about a first axis of rotation A1 (i.e., a rod link axis). The hollow shaft 2, as shown herein, has two externally rotating stepped shaft sections, in particular a first externally rotating stepped shaft section 21A and a second externally rotating stepped shaft section 21B. While the hollow shaft 2, as illustrated, has two externally rotating stepped shaft sections 21A, 21B, the hollow shaft 2 can have more or fewer than two externally rotating stepped shaft sections 21A, 21B if required and / or desired. The hollow shaft 2 as shown herein further has an internally circumferential stepped shaft section 22.While the hollow shaft 2, as illustrated herein, has an internally rotating stepped shaft section 22, the hollow shaft 2 can have more or less than an internally rotating stepped shaft section 22, if required and / or desired.

[0026] As in Fig. As shown in Figure 1, the rod link 3 (e.g., a solid shaft) is rotatably coupled to the housing 1 about the first axis of rotation A1. The rod link 3 has at least one contact section 31, which is formed circumferentially on an outer circumferential surface of the rod link 3 and which extends along the outer circumferential surface of the rod link 3 in an axial direction with respect to the first axis of rotation A1. While the rod link 3, as illustrated here, has only one contact section 31, the rod link 3 can have more than one contact section 31 if required and / or desired. The rod link 3 further has a projection 32, which extends from the outer circumferential surface of the rod link 3 in a radial direction with respect to the first axis of rotation A1.While the rod link 3, as illustrated herein, has only one projection 32, the rod link 3 can have more than one projection 32, and such a projection 32 can be formed in an annular shape, or more than one projection 32 can be positioned on the rod link 3 in a circumferential direction with respect to the first axis of rotation A1, if required and / or desired. The contact section 31 touches at least a portion of the hollow shaft 2 in a radial direction, and the projection 32 abuts the internally rotating stepped shaft section 22 of the hollow shaft 2 in an axial direction. Consequently, the rod link 3 and the hollow shaft 2 are operatively coupled to each other, rotating as a single unit. The rod link 3 and the hollow shaft 2 are connected to each other, for example, by means of a friction connection or a positive-locking connection, as shown in the following ( . Fig. 3A-3D) are shown, fixed together. Accordingly, the contact section 31 of the rod link 2, the projecting part 32 of the rod link 3 and the internally rotating stepped shaft section 22 of the hollow shaft 2 form a rotary transmission structure which transmits the rotation of the hollow shaft 2 to the rod link 3.

[0027] In the first embodiment, the rotary transmission arrangement 10 further comprises a bearing 4. The bearing 4 comprises two separate circular inner support parts 41A, 41B and a circular outer support part 42. According to a first embodiment, the bearing 4 includes an axially lower inner support part 41A and an axially upper inner support part 41B with respect to the first axis of rotation A1. Preferably, the bearing 4 is designed as a four-point contact roller bearing, comprising a single circular outer support part 42 and two separate circular inner support parts 41A, 41B, in particular the lower inner support part 41A and the upper inner support part 41B. However, the present invention is not limited thereto. While the bearing 4, as illustrated, has only a single circular outer support part 42, the bearing 4 can, if required and / or desired, comprise two separate circular outer support parts 42.Furthermore, bearing 4 can comprise a two-piece roller bearing or ball bearing, or a three-piece roller bearing or ball bearing, if required and / or desired. For example, bearing 4 can be designed as a deep groove ball bearing or as a double-row ring contact ball bearing, if required and / or desired.

[0028] As in Fig. As can be seen in Figure 1, the lower support part 41A of the bearing 4 abuts the first outer stepped shaft section 21A of the hollow shaft 2 in the axial direction. Furthermore, the single circular outer support part 42 of the bearing 4 abuts a bearing surface 11 (e.g., a bearing seat 11 of the housing 1) of the housing 1 in the axial and radial directions with respect to the axis of rotation A1. The rotary transmission arrangement 10 further includes a stop element 5 (e.g., a rod stop 5), which is operatively fixed to the rod 3. In the first embodiment, the stop element 5 is attached to the rod 3 by screw elements, which are arranged on the inside of the stop element 5 and on the outside of the end of the rod 3 (i.e., a rod stop of a screw type). However, the stop element can be arranged on the rod 3 by other means if required and / or desired. As in Fig. As can be seen in Figure 1, a portion of the stop element 5 abuts a portion of the lower inner support part 41B of the bearing 4, specifically the lower side of the lower inner support part 41B in the axial and radial directions with respect to the first axis of rotation A1. Accordingly, the four-point contact roller bearing 4 rotatably supports the rod link 3 and the hollow shaft 2 against the housing 1 in a radial and axial direction. When the hollow shaft 2 and the rod link 3 are arranged in the housing 1 via the bearing 4, the stop element 5 is attached to and screwed onto the rod link 3, thereby rotatably supporting the rod link 3 and the hollow shaft 2 together against the bearing 4 in the axial and radial directions. When the stop link 5 is screwed onto the rod link 3, the stop link 5 merely abuts the lower inner support part 41B of the bearing 4 without touching the lower inner support part 41B or the hollow shaft 2. This creates a gap orA gap is formed between the stop member 5 and the end section of the hollow shaft 2. By receiving the upper inner support part 41B of the bearing 4 through the stop member 5 and by receiving the lower inner support part 41A of the bearing 4 through the first outer stepped shaft section 21A, the rod link 3 is axially fixed against the hollow shaft 2 in a lower position. Consequently, the axial runout can be reduced. This axial locking arrangement further prevents movement of the rod link 3 in an axial direction. Therefore, secure axial positioning of the hollow shaft 2 and the rod link 3 can be achieved.

[0029] In the first embodiment, the rotary transmission arrangement 10 further comprises a circular bearing retainer 6 (e.g., a threaded screw 6). The circular bearing retainer 6 is securely fixed to an inner surface 12A of an opening section 12 of the housing 1. In the first embodiment, the inner surface 12A has an internal thread (not shown) into which an external thread (not shown) of the circular bearing retainer 6 is engaged. However, the present invention is not limited to this, and the circular bearing retainer 6 and the inner surface 12A can engage by other means if required and / or desired. In the first embodiment, the circular bearing retainer 6 is screwed to the opening section 12 of the housing 1 until a lower surface 62 of the surface of the circular bearing retainer 6 abuts the circular outer support part 42 of the bearing 4 in the axial direction with respect to the first axis of rotation A1.The outer diameter of the circular bearing retainer 6 is larger in the radial direction with respect to the first axis of rotation A1 than the outer diameter of the circular outer support part 42 of the bearing 4. As in . Fig. As can be seen in Figure 1, the housing 1 has a cylindrical section 14 and at least one stepped housing section 13, which is positioned at a lower end of the housing 1. The stepped housing section 13 extends radially inward from the end of the cylindrical section 14. The at least one bearing 4 is located where an axial end face of the at least one bearing 4 is positioned between the outer surface of the at least one stepped housing section 13 and the inner surface of the at least one stepped housing section 13. The housing structure described above provides sufficient thickness to support the bearing 4 in the radial direction.

[0030] The circular bearing retainer 6 further comprises at least one sealing element (e.g., a sealing ring) which is arranged within the circular bearing retainer 6 for the purpose of sealing. In the first embodiment, after the circular bearing retainer 6 is attached to the inner surface 12A of the opening section 12 of the housing 1 with screw links and abuts the circular outer support part 42 of the bearing 4 in the axial direction to support the bearing 4 in the axial direction, at least a part of the circular bearing retainer 6 is pressed or crimped onto at least a part of the opening section 12 of the housing 1 in order to securely fix the circular bearing retainer 6 to the bearing 4. In particular, the circular bearing retainer 6 has a concave section 61A, which is pressed inwards in the axial direction, on an axially lower surface 61 and a convex section 62A on the lower surface 62.A tool engagement hole 63 (e.g., tool engagement) is arranged on the concave section 61A of the circular bearing retainer 6 to allow engagement with special tools, such as a wrench. After the circular bearing retainer 6 is fixed to the housing 1 and at least part of the circular bearing retainer 6 is pressed or squeezed against the housing, the convex section 62A on the lower surface 62 of the circular bearing retainer 6 is arranged in a deeper area than the deformed section of the circular bearing retainer 6 that is pressed or squeezed against the housing 1. By providing the aforementioned structure of the circular bearing retainer 6, the circular bearing retainer 6 is securely fixed to the housing 1 without inaccuracy or looseness, and the stress of the pressing / squeezing / deformation can escape to the convex side of the circular bearing retainer 6.Therefore, the circular bearing retainer 6 securely locks or secures the bearing 4. Furthermore, by providing the aforementioned structure of the circular bearing retainer 6, this structure is flexible with regard to the dimensional tolerances of the bearing 4 and the housing 1.

[0031] A device 100 for converting a rotary motion into a linear motion according to a second embodiment is described below with reference to the Fig. The device 100 comprises the same configuration as the rotary transmission arrangement 10 except for the additional components of a stator 7, several magnets 8 and a ball nut 9. Consequently, the elements that have essentially the same function as those in the first embodiment are given the same reference numerals and are not described and / or illustrated again herein for the sake of brevity.

[0032] As in Fig. As shown in Figure 1, the device 100 for converting a rotary motion into a linear motion, according to a second embodiment, additionally comprises a stator 7 with several coils 71 or windings arranged circumferentially on the inner surface of the stator 7. The stator 7 is fixedly attached to the cylindrical section 14 of the housing 1. Furthermore, several magnets 8 are fixedly attached to an outer circumferential surface 23 of the hollow shaft 2, facing inwards or internally from the stator 7 in a radial direction with respect to the axis of rotation A1. The hollow shaft 2 is made of a magnetic material. Therefore, the magnetic flux or induced flux generated by one of the magnets 8 passes through the hollow shaft 2 and flows to the other magnets 8. This means that the hollow shaft 2 can be used as a magnetic path.The axial length of the magnets 8 and the axial length of a magnet-receiving section 2A of the hollow shaft 2, on which the magnets 8 are arranged, are the same, and the hollow shaft 2 is stepped inwards at the end of the magnet-receiving section 2A. If the axial length of the magnet-receiving section 2A is longer than that of the magnets 8, the flux from one of the magnets can easily diffuse through the longer section of the hollow shaft 2. This results in an ineffective flux cycle. Therefore, the highest efficiency can be achieved when the axial lengths of the magnets 8 and the magnet-receiving sections 2A are the same. A ball nut 9 is rotatably supported on several spiral grooves 33 or spiral slots on an outer circumferential periphery of the rod link 3. By providing the aforementioned rotary transmission arrangement 10, the rotation of the hollow shaft 2 is transmitted to the rod link 3 via the aforementioned rotary transmission structure.By providing the device 100, the rotary motion of the hollow shaft 2 and the rod link 3 is converted into a linear motion of the ball nut 9. Consequently, the ball nut 9 moves back and forth axially on the rod link 3, if required and / or desired. Since the ball nut 9 moves back and forth axially, the bearing 4 is subjected to a high load in the axial direction of the rod link 3. Because the stop link 5 accommodates the upper inner support part 41B of the bearing 4 and the first outer stepped shaft section 21A accommodates the lower inner support part 41A of the bearing 4, the axial runout is reduced. This axial locking arrangement further prevents the rod link movement in an axial direction.

[0033] An engine 200 according to a third embodiment is now referred to Fig. The motor 200 has essentially the same configuration as the device 100 for converting rotary motion into linear motion. Consequently, the elements that have essentially the same functions as those in the preceding embodiments are given the same reference numerals and are not described and / or illustrated again in detail herein for the sake of brevity. The motor 200 comprises the device 100 for converting rotary motion into linear motion, including the aforementioned elements. By providing the aforementioned structure, the motor 200 can achieve or provide the required strength or resistance against the force in a radial and axial direction of the rotating parts of the present invention. In a further aspect, the motor 200 can be configured as a brake system motor (brake motor).

[0034] Now, referring mainly to the Fig. 2 and 3A to 3D. As in Fig. Figure 2 illustrates the rotary transmission arrangement 10, which comprises the same configuration as the rotary transmission arrangement 10 according to the first embodiment of the present invention. Consequently, the elements that have essentially the same function as those in the first embodiment are given the same reference numerals and are not described and / or illustrated again in detail here for the sake of brevity. Fig. Figure 2 is an enlarged cross-sectional view of the rotary transmission arrangement 10 illustrated in Fig. 1, showing a mid-section line X - X', with respect to the rotary transmission structure, which transmits the rotation of the hollow shaft 2 to the rod link 3. As in Fig. As can be seen in Figure 2, particularly at the central section line X - X', the contact section corresponds to both the hollow shaft 2 and the rod link 3. Consequently, the rotation of the hollow shaft 2 is transmitted to the rod link 3. The rod link 3 can have a shape other than an annular shape, as shown in the Fig. 3A to 3D can be seen.

[0035] Now, referring to the Fig. Representing rotary transmission structure patterns or rotary transmission structure models in 3A to 3D. Fig. Figure 3A shows a partial cross-sectional view of the hollow shaft 2 and the rod link 3 of the rotary transmission arrangement 10 along the center section line X - X' of Fig. 2, wherein the rod link 3 has an elliptical shape and the contact section of the hollow shaft 2 corresponds to this.

[0036] Fig. Figure 3B shows a partial cross-sectional view of the hollow shaft 2 and the rod link 3 of the rotary transmission arrangement 10 along the center section line X -X' of Fig. 2, wherein the rod member 3 has a convex section comprising a shape or form and the contact section of the hollow shaft 2 corresponds to this.

[0037] Fig. Figure 3C shows a partial cross-sectional view of the hollow shaft 2 and the rod link 3 of the rotary transmission arrangement 10 along the center section line X - X' of Fig. 2, wherein the rod link 3 has a polygonal or polygonal shape or form and the contact section of the hollow shaft 2 corresponds to this.

[0038] Fig. 3D shows a partial cross-sectional view of the hollow shaft 2 and the rod link 3 of the rotary transmission arrangement 10 along the center section line X - X' of Fig. 2, wherein the rod member 3 has a concave section comprising a shape, and the contact section of the hollow shaft 2 corresponds to this.

[0039] As in Fig.As can be seen in Figure 1, the inner surface of the end of the hollow shaft 2 has a stepped end 81, which has an annular stepped shape such that a sensor yoke 82 can be arranged on the stepped end 81. In this embodiment, the sensor yoke 82 is designed as a hollow annular shape and has two cylindrical sections: a first cylindrical section 83 (an upper section) and a second cylindrical section 84 (a lower section). A plate section 85 extends outwards from the end of the second cylindrical section 84 in a circumferential direction. A sensor magnet can be arranged on the plate section 85. The first cylindrical section 83 is press-fitted into the stepped end 81 and fixed to the hollow shaft 2 such that the outer surface of the first cylindrical section 83 contacts the stepped end 81 in a radial direction.However, the shape of the sensor yoke 82 and the stepped end 81 is not limited to this embodiment. The stepped end 81 need not be annular; however, at least a portion of the inner surface of the hollow shaft 2 can be stepped such that a portion of the outer surface of the sensor yoke 82 can contact the stepped end in a radial direction. The sensor yoke 82 can consist of only one cylindrical section or of more than two cylindrical sections. Furthermore, the hollow shaft 2 can have several stepped ends 81 in a circumferential direction, and the annular sensor yoke 82 can have several convex sections projecting in an axial direction, the outer surface of the multiple convex sections contacting the multiple stepped ends 81 in a radial direction.

[0040] Furthermore, a rotation sensor (such as a Hall effect sensor, etc.) is arranged in an axial direction of the plate section 85 (not shown in the drawings), which can detect the rotation of the sensor yoke 82. The rotation of the hollow shaft 2 is then precisely detected to achieve accurate rotation control. Such precise rotation control is necessary for controlling a braking system, where the required pressures in the brake pads are needed to generate the corresponding braking forces.

[0041] Brake systems are arranged at the end of the ball nut 9 and move back and forth in accordance with the rotation of the hollow shaft 2. Therefore, the radial length of the crank nut 9 is shorter than that of the first cylindrical section 83, and the radial length of the first cylindrical section 83 is shorter than that of the second cylindrical section 84. The radial length of the second cylindrical section 84 can be adjusted according to the radial length of the brake system. In this case, since sufficient thickness or strength of the hollow shaft 2 must be ensured to achieve sufficient strength, and since the sensor yoke 82 extends from the inner surface of the hollow shaft 2, the outer surface of the hollow shaft 2 can only be used to fix the magnets 8. Because of this arrangement, the rotary transmission assembly 10 can be designed compactly with sufficient strength in one axial direction.

[0042] From the foregoing description of the present invention, a person skilled in the art will recognize improvements, changes, and modifications to the present invention. Such improvements, changes, and modifications are within the understanding of a person skilled in the art and are covered by the appended claims. Reference symbol list 1 case 2 hollow shafts 2A Magnet pickup section 3 rod link 4 cases 5 stop link 6 circular bearing retainer 7 Stator 8 magnets 9 ball nuts 10 Rotary transmission arrangement 11 storage area 12 Opening section 12A Internal surface 13-stepped housing section 14 cylindrical section 21A first outer stepped shaft section 21B second outer stepped wave section 22 internally circumferential stepped wave section 23 Perimeter outer surface 31 Contact section 32 Protrusion part 33 spiral grooves 41A, 41B circular internal support parts 41A lower inner support part 41B upper inner support part 42 circular outer support part 61 upper surface 61 Concave section 62 lower surface 62A Convex section 63 Tool engagement hole 71 coils 81-step end 82 Sensor yoke 83 first cylindrical section 84 second cylindrical section 85 plate section 100 Device for converting a rotary motion into a linear motion 200 engine

Claims

Rotary transmission arrangement (10) comprising: a housing (1) having a bearing surface (11) which supports at least one bearing (4); a hollow shaft (2) which is rotatably coupled to the housing (1) about a first axis of rotation (A1), wherein the hollow shaft (2) has at least one externally rotating stepped shaft section (21A, 21B) and at least one internally rotating stepped shaft section (22); a rod link (3) which is rotatably coupled to the housing (1) about the first axis of rotation (A1), having at least one contact section (31) and at least one projecting part (32), wherein the at least one contact section (31) touches at least a part of the hollow shaft (2) in a radial direction and the at least one projecting part (32) abuts the at least one internally rotating stepped shaft section (22) in an axial direction;wherein the at least one bearing (4) comprising at least one circular inner support part (41A, 41B) and at least one circular outer support part (42) supports the hollow shaft (2) and the rod link (3) rotatably against the housing (1) about the first axis of rotation (A1), wherein the at least one circular inner support part (41A, 41B) abuts at least a part of the at least one outer stepped shaft section (21A) in an axial direction and the at least one circular outer support part (42) abuts the bearing surface (11) of the housing (1) in the axial direction; and a stop member (5) which is / will be fixed to the rod link (3), wherein the stop member (5) abuts the at least one circular inner support part (41B) in the axial direction. Rotary transmission arrangement (10) according to claim 1, further comprising: a circular bearing retaining member (6) which is / will be fixed to an inner surface (12a) of an opening section (12) of the housing (1), and is designed to abut at least a part of the at least one circular outer support part (42) in the axial direction. Rotary transmission arrangement (10) according to claim 2, in which the outer diameter of the circular bearing retaining member (6) is larger in a radial direction than an outer diameter of the at least one circular outer support part (42). Rotary transmission arrangement (10) according to claim 2 or 3, wherein the circular bearing retaining member (6) comprises at least one sealing element. Rotary transmission arrangement (10) according to one of claims 2 to 4, in which at least a part of the circular bearing retaining member (6) is pressed onto at least a part of the opening section (12) and a deformed section is formed. Rotary transmission arrangement (10) according to one of claims 2 to 5, wherein the circular bearing retainer (6) has a concave section (61A) on an upper surface (61) of the circular bearing retainer (6) and a convex section (62A) on a lower surface (62) of the circular bearing retainer (6), wherein the concave section (61A) has a tool engagement hole (63). Rotary transmission arrangement (10) according to claim 6, in which the convex section (62A) is arranged on the lower surface (62) of the circular bearing retainer (6) in the deeper area than the deformed section in the axial direction. Rotary transmission arrangement (10) according to one of claims 1 to 7, wherein the housing (1) has at least one stepped housing section (13), wherein the at least one bearing (4) is arranged where an axial end surface of the at least one bearing (4) is positioned between the outer surface of the at least one stepped housing section (13) and the inner surface of the at least one stepped housing section (13). Rotary transmission arrangement (10) according to one of claims 1 to 8, in which the at least one bearing (4) is a four-point contact bearing, wherein the circular inner support part (41A, 41B) has a lower inner support part (41A) abutting the at least one outer-circulating stepped shaft section (21A) and an upper inner support part (41B) abutting the stop member (5). Rotary transmission arrangement (10) according to one of claims 1 to 9, in which at least one section of the hollow shaft (2) corresponds to the shape of the at least one contact section (31) of the rod member (3). Rotary transmission arrangement (10) according to one of claims 1 to 10, in which the at least one contact section (31) of the rod member (3) has a shape different from a circular shape. Device (100) for converting a rotary motion into a linear motion, comprising: a housing (1) having a bearing surface (11) which supports at least one bearing (4); a stator (7) with several coils (71) arranged in a circumferential direction, wherein the stator (7) is / will be arranged on a cylindrical section (14) of the housing (1); a hollow shaft (2) which is / will be rotatably coupled to the housing (1) about a first axis of rotation (A1), wherein the hollow shaft (2) has at least one externally rotating stepped shaft section (21A, 21B) and at least one internally rotating stepped shaft section (22); several magnets (8) which are arranged on an external circumferential surface (23) of the hollow shaft (2) inwards from the stator (7) in a radial direction;a rod link (3) which is / will be rotatably coupled to the housing (1) about the first axis of rotation (A1), comprising at least one contact section (31) and at least one projecting part (32), wherein the at least one contact section (31) touches at least a part of the hollow shaft (2) in a radial direction and the at least one projecting part (32) abuts the at least one internally rotating stepped shaft section (22) in an axial direction;wherein the at least one bearing (4) comprising at least one circular inner support part (41A, 41B) and at least one circular outer support part (42) supports the hollow shaft (2) and the rod link (3) rotatably against the housing (1) about the first axis of rotation (A1), wherein the at least one circular inner support part (41A, 41B) abuts at least a part of the at least one outer stepped shaft section (21A) in the axial direction and the at least one circular outer support part (42) abuts the bearing surface (11) of the housing (1) in the axial direction; a stop member (5) which is / will be fixed to the rod link (3), wherein the stop member (5) abuts the at least one circular inner support part (41B) in the axial direction;and a ball nut (9) which is rotatably supported on spiral grooves (33) on an outer circumferential surface of the rod link (3), wherein the ball nut (9) moves in the axial direction of the first axis of rotation (A1) in accordance with the rotation of the rod link (3). Motor (200) comprising a device (100) for converting a rotary motion into a linear motion according to claim 12 and / or a rotary transmission arrangement according to any one of claims 1 to 11. Motor (200) according to claim 13, wherein the motor is designed as a brake system motor.

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