Gear box and intelligent seat adjusting transmission unit thereof

Abstract

The utility model discloses a gear box and a seat intelligent adjusting transmission unit thereof.The gear box is used for containing a worm gear and a worm in a relatively rotating mode, a main containing part is arranged in the middle area of the gear box and used for forming a main containing cavity suitable for containing the worm gear, and the inner side wall and the outer side wall of the main containing part are both cambered surfaces; therefore, on the basis of ensuring the thickness of the main accommodating part, the stress of the main accommodating part is more dispersed, and the structural reliability of the gearbox is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile accessories, and in particular to a gear box and a seat intelligent adjustment transmission unit thereof. Background Art

[0002] The seat intelligent adjustment transmission unit is a common mechanism for adjusting the seat position in automobiles. It is arranged between the seat and the bottom of the car body, and is used to realize the transmission connection and coordination between the seat and the guide rail at the bottom of the car body. When the motor is working, it can move the seat along the guide rail through the seat intelligent adjustment transmission unit, thereby achieving the purpose of adjusting the seat position. Existing seat intelligent adjustment transmission units usually use worm gear transmission to make the car seat move smoothly. However, the gear box of the existing seat intelligent adjustment transmission unit is prone to stress concentration, and the structural strength is low, which affects the reliability and service life of the seat intelligent adjustment transmission unit. Summary of the invention

[0003] An object of the present invention is to provide a gear box that can reduce the generation of stress concentration and help improve the structural reliability of the gear box.

[0004] Another object of the present invention is to provide a seat intelligent adjustment transmission unit having the above-mentioned gear box.

[0005] In order to achieve at least one of the above purposes, the technical solution adopted by the present invention is: a gear box for accommodating a worm wheel and a worm in a relatively rotatable manner, the middle area of ​​the gear box has a main accommodating portion for forming a main accommodating cavity suitable for accommodating the worm wheel, the main accommodating portion has an inner wall and an outer wall, and the inner wall and the outer wall are both arc surfaces.

[0006] As a preference, the inner wall and the outer wall are both arc surfaces.

[0007] Preferably, a secondary accommodating portion is provided above the main accommodating portion, for forming a secondary accommodating cavity suitable for accommodating the worm, the secondary accommodating cavity being communicated with the main accommodating portion so that the worm wheel and the worm wheel can mesh with each other; the secondary accommodating portion has an inner end surface, the inner end surface includes an intermediate surface and an extension surface, the intermediate surface is arranged opposite to the end surface of the worm wheel, the extension surface extends from the intermediate surface to the two ends of the gear box, and the length of the extension surface along the axial direction of the worm wheel is consistent with the length of the main accommodating portion along the axial direction of the worm wheel, so that the extension surface intersects with the inner side wall of the main accommodating portion.

[0008] Preferably, the main accommodating portion further has an inner end wall, and the secondary accommodating portion further has a peripheral side surface, and the inner end wall, the peripheral side surface and the extension surface intersect; the inner end wall is protrudingly provided with reinforcing ribs, and the reinforcing ribs are suitable for connecting the inner end wall and the peripheral side surface, and / or connecting the inner end wall and the extension surface.

[0009] As a preference, the thickness of the reinforcing rib is L, satisfying: 0<L≤2.5mm.

[0010] Preferably, the auxiliary accommodation portion has a supporting hole and a convex rib, the supporting hole is used to support the worm, and the convex rib is protrudingly located on the inner end surface of the auxiliary accommodation portion and surrounds the outer circumference of the supporting hole, suitable for abutting against the worm.

[0011] Preferably, the inner circumferential surface of the convex rib is coplanar with the inner circumferential surface of the supporting hole to jointly support the worm.

[0012] As a preference, the height of the convex rib is H, satisfying: 0<H≤1mm.

[0013] Preferably, the diameter of the end face of the worm that abuts against the convex rib is d, and the outer diameter of the convex rib is D, satisfying: d≤D.

[0014] In order to achieve at least one of the above purposes, the technical solution adopted by the present invention is: a seat intelligent adjustment transmission unit, comprising: a worm wheel and a worm that mesh with each other; a gear box as described above, the gear box comprises a first shell and a second shell that are interlocked with each other, the first shell and the second shell are each provided with a main accommodating part and a secondary accommodating part, which are suitable for forming a main accommodating cavity and a secondary accommodating cavity after being interlocked, so as to accommodate the worm wheel and the worm in a relatively rotatable manner.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The inner wall and the outer wall of the main housing portion are both cambered surfaces, which can disperse the stress of the main housing portion while ensuring the thickness of the main housing portion, thereby improving the structural reliability of the gearbox;

[0017] (2) By providing reinforcing ribs, the inner end wall and the circumferential side surface are connected, as well as the inner end wall and the extended surface, which is beneficial to improving the structural reliability of the gear box. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front structural schematic diagram of a seat intelligent adjustment transmission unit in some embodiments of the present application;

[0019] Figure 2 is a schematic diagram of the back structure of a seat intelligent adjustment transmission unit in some embodiments of the present application;

[0020] Figure 3 is an exploded diagram of a seat intelligent adjustment transmission unit of some embodiments of the present application;

[0021] Figure 4 is a schematic diagram of the internal structure of a seat intelligent adjustment transmission unit of some embodiments of the present application;

[0022] Figure 5 is a cross-sectional view of a seat intelligent adjustment transmission unit according to some embodiments of the present application;

[0023] Figure 6 is a cross-sectional view of a gear box of a seat intelligent adjustment transmission unit in some embodiments of the present application;

[0024] Figure 7 is a schematic diagram of the internal structure of the first shell of some embodiments of the present application;

[0025] Figure 8 yes Figure 7 A partial enlarged view of the middle A;

[0026] Fig. 9 is a schematic diagram of the internal structure of the second housing of some embodiments of the present application;

[0027] Fig.10 yes Fig. 9 A partial enlarged view of point B in the middle;

[0028] Fig.11 is an internal front view of a first housing of some embodiments of the present application;

[0029] Fig.12 yes Fig.11 A partial enlarged view of point C in the middle.

[0030] In the figure: 10, gear box; 11, first housing; 12, second housing; 13, main housing; 131, inner side wall; 132, outer side wall; 133, inner end wall; 134, main housing cavity; 14, auxiliary housing; 141, inner end surface; 1411, middle surface; 1412, extension surface; 142, outer end surface; 143, peripheral side surface; 144, reinforcing rib; 145, auxiliary housing cavity; 146, supporting hole; 147, convex rib; 15, stealing part; 151, transverse surface; 152, vertical surface; 16, bottom surface; 17, lower end side; 20, worm wheel; 21, external tooth portion; 22, shaft neck portion; 30, worm; 31, meshing portion; 32, rod neck portion; 40, bushing; 41, supporting section; 42, wear-resistant section; 50, wear-resistant part; 60, sleeve part; 70, shock-absorbing part. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0032] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0033] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0034] A gear box 10, such as Figure 1-Figure 6 As shown, the gearbox 10 is used to relatively rotatably accommodate the worm wheel 20 and the worm 30. The middle area of ​​the gearbox 10 has a main accommodating portion 13, which is used to form a main accommodating cavity 134 suitable for accommodating the worm wheel 20. The main accommodating portion 13 has an inner wall 131 and an outer wall 132, and both the inner wall 131 and the outer wall 132 are cambered surfaces.

[0035] It is understandable that in the existing gearbox, the inner side wall of the main housing portion is an arc surface to avoid the worm gear and surround the outer periphery of the worm gear, while the outer side wall of the main housing portion is a plane to make the gearbox more square and convenient to place. However, since the inner side wall is an arc surface and the outer side wall 1 is a plane, the wall thickness of the main housing portion 13 is uneven, which is prone to stress concentration.

[0036] In this embodiment, if Figure 5-Figure 6 As shown, the inner wall 131 and the outer wall 132 of the main housing portion 13 of the gear box 10 are both arc surfaces, so that the wall thickness of the main housing portion 13 is more uniform while ensuring the thickness of the main housing portion 13, which is beneficial to disperse the stress of the main housing portion 13 and further helps to improve the structural reliability of the gear box 10.

[0037] In some embodiments, both the inner wall 131 and the outer wall 132 are arc surfaces for easy manufacturing and processing. In a specific embodiment, the arc diameter of the inner wall 131 is consistent with the arc diameter of the outer wall 132, so that the wall thickness of the main housing portion 13 is uniform, so that the stress is more dispersed, the stress concentration is reduced, and the structural strength of the gearbox 10 is improved. In another specific embodiment, the arc diameter of the inner wall 131 is slightly smaller than the arc diameter of the outer wall 132. It can be understood that under normal circumstances, the axis of the arc corresponding to the inner wall 131, the axis of the arc corresponding to the outer wall 132, and the axis of the worm wheel 20 are located in the same horizontal plane. Therefore, when the arc diameter of the inner wall 131 is slightly smaller than the arc diameter of the outer wall 132, the wall thickness of the main housing portion 13 gradually increases from the horizontal plane where the axis is located to the direction away from the horizontal plane where the axis is located, so that the wall thickness of the connection between the main housing portion 13 and other parts of the gearbox 10 is relatively thicker, while reducing stress concentration, it is beneficial to improve the structural strength of the gearbox 10.

[0038] In some embodiments, Figure 5-Figure 12 As shown, a secondary accommodating portion 14 is provided above the main accommodating portion 13, which is used to form a secondary accommodating cavity 145 suitable for accommodating the worm 30. The secondary accommodating cavity 145 is communicated with the main accommodating cavity 134 so that the worm wheel 20 and the worm 30 can mesh with each other; the secondary accommodating portion 14 has an inner end surface 141, and the inner end surface 141 includes an intermediate surface 1411 and an extension surface 1412. The intermediate surface 1411 is arranged opposite to the end surface of the worm 30, and the extension surface 1412 extends from the intermediate surface 1411 to both ends of the gear box 10, and the length of the extension surface 1412 along the axial direction of the worm wheel 20 is consistent with the length of the main accommodating portion 13 along the axial direction of the worm wheel 20, so that the extension surface 1412 intersects with the inner side wall 131 of the main accommodating portion 13, which is conducive to increasing the joining length between the inner end surface 141 and the inner side wall 131, thereby improving the connection strength between the main accommodating portion 13 and the secondary accommodating portion 14.

[0039] It is worth mentioning that, in the existing gearbox, the inner end face of the secondary accommodating portion is not provided with an extension face, that is, the position corresponding to the extension face is the inner side wall of the main accommodating portion, and the inner side wall is an arc surface, while the outer end face of the secondary accommodating portion is a plane, which makes the local wall thickness between the inner side wall of the main accommodating portion and the outer end face of the secondary accommodating portion thicker, which easily causes uneven stress distribution.

[0040] In this implementation, if Figure 6 As shown, by providing the extension surface 1412 , the outer end surface 142 and the inner end surface 141 of the auxiliary accommodation portion 14 are both planes, thereby making the wall thickness more uniform, which is beneficial to reducing the generation of concentrated stress, thereby further improving the structural strength of the gear box 10 .

[0041] Further, such as Figure 5 , Figure 7and Figure 8 As shown, the main accommodation portion 13 also has an inner end wall 133, and the secondary accommodation portion 14 also has a peripheral side surface 143, and the inner end wall 133, the peripheral side surface 143 and the extension surface 1412 intersect; the inner end wall 133 is protrudingly provided with a reinforcing rib 144, and the reinforcing rib 144 is suitable for connecting the inner end wall 133 and the peripheral side surface 143, and / or connecting the inner end wall 133 and the extension surface 1412, which is beneficial to improving the structural reliability of the gear box 10.

[0042] Furthermore, Figure 6 , Fig. 9 and Fig.11 As shown, a material stealing portion 15 is provided below the main accommodating portion 13, and the material stealing portion 15 has a transverse surface 151 and a vertical surface 152. The transverse surface 151 is arranged relative to the bottom surface 16 of the gear box 10, so that the wall thickness between the transverse surface 151 and the bottom surface 16 is uniform, and the vertical surface 152 is arranged relative to the lower end side surface 17 of the bottom shell, so that the wall thickness between the vertical surface 152 and the lower end side surface 17 is uniform, which is beneficial to reduce the generation of concentrated stress and improve the structural strength of the gear box 10.

[0043] Specifically, the existing gear box is not provided with a material stealing part, that is, the position corresponding to the material stealing part is the inner wall of the main accommodating part, and the inner wall is an arc surface, while the bottom surface and the lower end side surface of the gear box are flat, which makes the local wall thickness between the inner wall and the bottom surface of the gear box and between the inner wall and the lower end side surface of the gear box thicker, which easily causes uneven stress distribution.

[0044] In this embodiment, by providing the stealing portion 15 , the local wall thickness can be thinned, so that the wall thickness of the gear box 10 is more uniform, which is beneficial to reduce the generation of concentrated stress, and further improve the structural strength of the gear box 10 .

[0045] It is worth mentioning that Fig. 9 and Fig.11 As shown, the transverse surface 151 and the vertical surface 152 of the material stealing portion 15 intersect with the inner end wall 133 of the main accommodating portion 13, and the inner end wall 133 is protrudingly provided with a reinforcing rib 144, and the reinforcing rib 144 is suitable for connecting the inner end wall 133 and the transverse surface 151, and / or connecting the inner end wall 133 and the vertical surface 152, which is beneficial to improving the structural reliability of the gear box 10.

[0046] Further, such as Fig.12 As shown, the thickness of the reinforcing rib 144 is L, which satisfies: 0<L≤2.5mm, so as to increase the local thickness of the gear box 10 to improve the structural strength of the gear box 10 while reducing the impact on the uniformity of the wall thickness of the gear box 10 and reducing the risk of stress concentration.

[0047] In some embodiments, Figure 5 , Figure 7 and Fig. 9 As shown, the auxiliary housing portion 14 has a supporting hole 146 and a convex rib 147. The supporting hole 146 is used to support the worm 30. The convex rib 147 is protrudingly located on the inner end surface 141 of the auxiliary housing portion 14 and surrounds the outer periphery of the supporting hole 146, and is suitable for abutting against the worm 30. Specifically, the worm 30 includes a meshing portion 31 for meshing with the worm wheel 20, and a rod neck portion 32 located at both ends of the meshing portion 31. The rod neck portion 32 is suitable for being accommodated in the supporting hole 146 to support the worm 30 to be rotatably connected to the gear box 10. It can be understood that when the worm 30 rotates, especially when axial movement occurs, the end surface of the meshing portion 31 will generate friction with the convex rib 147, that is, the convex rib 147 can provide a wear margin, which is conducive to preventing the worm 30 from directly causing wear to the inner end surface 141 of the auxiliary housing portion 14, thereby extending the service life of the gear box 10.

[0048] Furthermore, in some embodiments, Figure 5 As shown, both ends of the worm 30 are also sleeved with a shaft sleeve 40, and the shaft sleeve 40 includes a supporting section 41 and a wear-resistant section 42 arranged in sequence along the axial direction. When the shaft sleeve 40 is sleeved on the rod neck 32, the supporting section 41 is suitable for being accommodated in the supporting hole 146, so that the worm 30 can be rotatably connected to the gear box 10, and the wear-resistant section 42 is located between the end face of the meshing portion 31 of the worm 30 and the inner end face 141 of the auxiliary accommodation portion 14. When the worm 30 rotates, friction is generated between the wear-resistant section 42 and the convex rib 147, thereby reducing the wear of the worm 30 and the inner end face 141, which is beneficial to further extend the service life of the worm 30.

[0049] It is understandable that the rib 147 can be a full circle so that the rib 147 can evenly distribute the axial force on the worm 30, so that the worm 30 is evenly stressed and easy to process. The rib 147 can also be a plurality of arc segments, which can reduce the contact area between the rib 147 and the worm 30 while providing wear allowance, thereby helping to reduce the friction between the rib 147 and the worm 30, so that the worm 30 rotates more smoothly.

[0050] In some embodiments, the inner circumference of the rib 147 is coplanar with the inner circumference of the support hole 146 to jointly support the worm 30 or the sleeve 40. It is understood that the inner circumference of the rib 147 is coplanar with the inner circumference of the support hole 146, which can increase the matching length between the worm 30 and the gear box 10, or increase the matching length between the sleeve 40 and the gear box 10, thereby facilitating the connection reliability between the worm 30 and the gear box 10. In addition, the inner circumference of the rib 147 and the inner circumference of the support hole 146 can be processed and formed together, which is conducive to reducing the processing steps of the gear box 10.

[0051] In other embodiments, the inner circumference of the rib 147 is located at the periphery of the support hole 146 to avoid the inner circumference of the rib 147 from contacting the worm 30 or the sleeve 40 , thereby helping to reduce the processing requirements for the inner circumference of the rib 147 .

[0052] In some embodiments, Figure 5 As shown, the height of the rib 147 is H, which satisfies: 0<H≤1mm, so as to provide sufficient wear allowance and reduce the impact on the size of the gear box 10, the worm 30 and the sleeve 40.

[0053] In some embodiments, Figure 5 As shown, the diameter of the end face of the worm 30 that abuts against the rib 147 is d, and the outer diameter of the rib 147 is D, which satisfies: d≤D. Specifically, when the two ends of the worm 30 are not sleeved with the sleeve 40, the surface of the worm 30 that abuts against the rib 147 is the end face of the meshing portion 31 of the worm 30, and the diameter of the end face of the meshing portion 31 is recorded as d; when the two ends of the worm 30 are sleeved with the sleeve 40, the surface of the worm 30 that abuts against the rib 147 is the end face of the wear-resistant section 42 of the sleeve 40, and the diameter of the end face of the wear-resistant section 42 is recorded as d. It can be understood that if the outer diameter of the rib 147 is smaller than the diameter of the end face of the worm 30 that abuts against the rib 147, the outer edge of the end face cannot be supported by the rib 147 along the axial direction of the worm 30, which increases the risk of the end face of the worm 30 or the sleeve 40 tilting relative to the rib 147. In the present embodiment, when the outer diameter of the rib 147 is greater than or equal to the diameter of the contact surface, the rib 147 can stably support the worm 30 or the sleeve 40 in the axial direction, which is beneficial for making the axial force on the worm 30 and the sleeve 40 more uniform.

[0054] Preferably, the inner circumferential surface of the convex rib 147 is coplanar with the inner circumferential surface of the support hole 146, and d<D≤d+1mm.

[0055] A seat intelligent adjustment transmission unit, such as Figure 1-4 As shown, it includes: a worm wheel 20 and a worm 30 meshing with each other; the above-mentioned gear box 10, the gear box 10 includes a first shell 11 and a second shell 12 that are interlocked with each other, the first shell 11 and the second shell 12 are respectively provided with a main accommodating portion 13 and a secondary accommodating portion 14, which are suitable for forming a main accommodating cavity 134 and a secondary accommodating cavity 145 after being interlocked, so as to accommodate the worm wheel 20 and the worm 30 in a relatively rotatable manner.

[0056] Furthermore, the worm wheel 20 includes an outer tooth portion 21 for meshing with the worm 30, and a journal portion 22 located at both ends of the outer tooth portion 21; the seat intelligent adjustment transmission unit also includes a wear-resistant part 50 and a sleeve part 60, the wear-resistant part 50 is suitable for being sleeved on the journal portion 22 of the worm wheel 20, and can rotate synchronously with the worm wheel 20; the sleeve part 60 is suitable for being sleeved on the journal portion 22 of the worm wheel 20, and is located on the side of the wear-resistant part 50 away from the outer tooth portion 21, and the sleeve part 60 is fixedly connected to the gear box 10, that is, the sleeve part 60 cannot rotate relative to the gear box 10, and then when the worm 30 rotates relative to the gear box 10, the wear-resistant part 50 and the sleeve part 60 rotate relative to each other to generate friction, thereby reducing the wear of the worm 30 and the gear box 10, which is beneficial to extend the service life of the worm 30 and the gear box 10.

[0057] In some embodiments, Figure 3 As shown, the seat intelligent adjustment transmission unit also includes a shock absorbing member 70, which is suitable for being installed on the outside of the gear box 10 and wrapping the opposite ends of the gear box along the axial direction of the worm gear 20. When the seat intelligent adjustment transmission unit moves to the end of the stroke, the shock absorbing member 70 can play a role in buffering, shock absorption and noise reduction, which is beneficial to reduce the risk of damage to the seat intelligent adjustment transmission unit due to impact, further extend the service life of the seat intelligent adjustment transmission unit, and at the same time help to improve the comfort of the car seat.

[0058] The above describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A gear box for accommodating a worm wheel and a worm in a relatively rotatable manner, characterized in that: The middle area of ​​the gear box has a main accommodating portion for forming a main accommodating cavity suitable for accommodating the worm gear, and the main accommodating portion has an inner side wall and an outer side wall, and both the inner side wall and the outer side wall are cambered surfaces.

2. The gearbox according to claim 1, characterized in that: The inner wall and the outer wall are both arc surfaces.

3. The gearbox according to claim 1, characterized in that: A secondary accommodating portion is provided above the main accommodating portion, which is used to form a secondary accommodating cavity suitable for accommodating the worm, and the secondary accommodating cavity is communicated with the main accommodating portion so that the worm wheel and the worm wheel can mesh with each other; the secondary accommodating portion has an inner end surface, and the inner end surface includes an intermediate surface and an extension surface, the intermediate surface is arranged opposite to the end surface of the worm wheel, the extension surface extends from the intermediate surface to the two ends of the gear box, and the length of the extension surface along the axial direction of the worm wheel is consistent with the length of the main accommodating portion along the axial direction of the worm wheel, so that the extension surface intersects with the inner side wall of the main accommodating portion.

4. The gearbox according to claim 3, characterized in that: The main accommodating portion also has an inner end wall, and the secondary accommodating portion also has a peripheral side surface, and the inner end wall, the peripheral side surface and the extension surface intersect; the inner end wall is protrudingly provided with reinforcing ribs, and the reinforcing ribs are suitable for connecting the inner end wall and the peripheral side surface, and / or connecting the inner end wall and the extension surface.

5. The gearbox according to claim 4, characterized in that: The thickness of the reinforcing rib is L, which satisfies: 0<L≤2.5mm.

6. The gearbox according to any one of claims 3 to 5, characterized in that: The auxiliary accommodation portion has a supporting hole and a convex rib, wherein the supporting hole is used to support the worm, and the convex rib is protrudingly located on the inner end surface of the auxiliary accommodation portion and surrounds the outer circumference of the supporting hole, and is suitable for abutting against the worm.

7. The gearbox according to claim 6, characterized in that: The inner circumferential surface of the convex rib is coplanar with the inner circumferential surface of the supporting hole to jointly support the worm.

8. The gearbox according to claim 6, characterized in that: The height of the convex rib is H, which satisfies: 0<H≤1mm.

9. The gearbox according to claim 6, characterized in that: The diameter of the end face of the worm that contacts the convex rib is d, and the outer diameter of the convex rib is D, satisfying: d≤D.

10. A seat intelligent adjustment transmission unit, characterized in that: include: A worm wheel and a worm screw meshing with each other; a gear box as described in any one of claims 1 to 9, wherein the gear box comprises a first shell body and a second shell body which are interlocked with each other, wherein the first shell body and the second shell body are respectively provided with a main accommodating portion and a secondary accommodating portion, which are suitable for forming a main accommodating cavity and a secondary accommodating cavity after being interlocked, so as to accommodate the worm wheel and the worm screw in a relatively rotatable manner.

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