JP7686473B2 - Steering gear - Google Patents

Description

The present invention relates to a steering device that reduces the size of the device configuration.

A steering device installed in a vehicle, etc., inputs rotation according to the operation of a steering wheel, etc., and outputs a rotation output via a reduction gear. In order to create a burden during operation, steering devices that use a hydraulic device to provide auxiliary force in the operating direction have been commonly used. In recent years, there has been an increase in steering devices that are electrically controlled by a motor, etc. to provide auxiliary force in the operating direction (see, for example, Patent Document 1).

JP 2017-128300 A

It is desirable for the steering device to receive input from operation and auxiliary rotational force from a motor or the like, and for the device configuration to be compact.

The present invention aims to provide a steering device that can reduce the size of the device configuration.

The present invention is a steering device that includes an input device that generates a rotational driving force by a transmission shaft that rotates in conjunction with the input shaft in a direction perpendicular to the input shaft to which rotation linked to operation is transmitted, a reducer that receives the rotational driving force from the input device arranged on one side, reduces the number of rotations compared to the rotational driving force, and increases the torque to output a rotational force around the rotational shaft, a motor that is arranged on the one side adjacent to the direction perpendicular to the transmission shaft and inputs a rotational assist force to the reducer in a direction that increases the rotational driving force, and an output arm that is connected to the reducer and rotates around the rotational shaft within an arbitrary angle range by the rotational force.

According to the present invention, by providing an input device and a motor on one side of the reducer, the device configuration can be made smaller in the radial direction of the reducer. Also, according to the present invention, by providing an input device and a motor on one side of the reducer, the output arm can rotate without any restrictions on the rotation range in the reducer.

The reducer of the present invention may also include an input gear, a plurality of spur gears that receive the rotational driving force and rotate in mesh with the input gear, a plurality of eccentric cams formed on a plurality of shafts that are respectively connected to the plurality of spur gears, an eccentric gear that rotates eccentrically about the rotation axis of the input gear, and a case to which the output arm is connected and in which the eccentric gear rotates eccentrically around the rotation axis along the inner circumferential surface and outputs rotation at a reduced rotation speed compared to the rotation speed of the spur gear.

According to the present invention, by inputting a rotational driving force to the spur gear of the reducer, it is possible to output rotation from the reducer at a rotational speed that is reduced compared to the rotational speed of the spur gear.

The present invention is a steering device that includes an input device that inputs a rotational driving force according to an operation, a reducer that receives the rotational driving force, reduces the number of rotations compared to the rotational driving force, and increases the torque to output a rotational force around a rotation axis, and an output section that is connected to the reducer and rotates around the rotation axis by the rotational force, and the input device is disposed on one side of the reducer.

According to the present invention, the input device is provided on one side of the reducer, so the device configuration can be made smaller in the radial direction of the reducer.

The input device of the present invention may have an orthogonal input section including an input shaft that inputs the rotational driving force, and a transmission shaft that rotates in conjunction with the input shaft in a direction perpendicular to the input shaft and inputs the rotational driving force to the reducer, and a motor that is disposed adjacent to the transmission shaft of the orthogonal input section in the perpendicular direction and inputs a rotational assist force to the reducer in a direction that enhances the rotational driving force.

According to the present invention, the orthogonal input section and the motor are provided on one side of the reducer, so that the output arm can rotate without any restrictions on the rotation range in the reducer.

The present invention is a steering device comprising: an input device that inputs a rotational driving force according to an operation; a reducer that receives the rotational driving force, reduces the number of rotations compared to the rotational driving force, and increases the torque to output a rotational force around a rotational axis; and an output arm that is connected to the reducer and rotates around the rotational axis by the rotational force. The input device is disposed on one side of the reducer, and has an orthogonal input section that includes an input shaft that inputs the rotational driving force and a transmission shaft that rotates in conjunction with the input shaft in a direction perpendicular to the input shaft and inputs the rotational driving force to the reducer; and a motor that is disposed adjacent to the transmission shaft of the orthogonal input section in the perpendicular direction and inputs a rotational auxiliary force to the reducer in a direction that increases the rotational driving force, and the output arm is connected to the reducer so as to be freely rotatable without any limit to the rotation range.

According to the present invention, the orthogonal input section and the motor are provided on one side of the reducer, so that the device configuration can be made compact in the radial direction of the reducer. Also, according to the present invention, the orthogonal input section and the motor are provided on one side of the reducer, so that the output arm can rotate without any restrictions on the rotation range in the reducer.

The present invention makes it possible to miniaturize the device configuration of the steering device.

1 is a cross-sectional view showing an outline of a configuration of a steering device according to an embodiment of the present invention. FIG. FIG.

As shown in FIG. 1, the steering device W includes an input device 10 that inputs the rotational driving force during operation, a reduction gear 1 that amplifies the torque of the rotational driving force and outputs the rotational force, and an output arm 30 (pitman arm) that is connected to the reduction gear 1 and rotates due to the rotational force.

The input device 10 is disposed on one side of the reducer 1. The input device 10 includes an orthogonal input unit 11 that outputs the rotational driving force in an operation by orthogonally rotating the rotational direction, and a motor M that provides an auxiliary force for the operation.

The orthogonal input unit 11 includes a housing 11K that is fixed to a fixed object such as a vehicle body. The housing 11K is provided with an input shaft 12 to which a rotational driving force is input during operation. The input shaft 12 is formed, for example, in a cylindrical shape. The input shaft 12 is supported by the housing 11K via a bearing R1 so as to be rotatable about an axis 12L. One end of the input shaft 12 is exposed to the outside of the housing 11K, for example, and is connected to a steering shaft (not shown) that rotates in conjunction with steering wheel operation.

A first bevel gear 12A is formed on the other end of the input shaft 12. The first bevel gear 12A has bevel teeth formed on a conical surface. A transmission shaft 13 is arranged in a direction perpendicular to the input shaft 12. The arrangement direction of the input shaft 12 is not limited to that shown in the figure, and may be arranged at any position around the axis 13L of the transmission shaft 13 depending on the state of the installation object. The transmission shaft 13 rotates in conjunction with the input shaft 12 and inputs the rotational driving force input by the input shaft 12 to the reducer 1. The transmission shaft 13 is formed, for example, in a cylindrical shape. One end side and the other end side of the transmission shaft 13 are axially supported by the housing 11K via a bearing R2 so as to be rotatable around the axis 13L. The other end side of the transmission shaft 13 is axially supported on the reducer 1 side. One end side of the transmission shaft 13 is axially supported at a position away from the reducer 1.

The transmission shaft 13 has a second bevel gear 13A formed in the center. The second bevel gear 13A has bevel teeth formed on its conical surface. The second bevel gear 13A meshes with the first bevel gear 12A. The second bevel gear 13A is disposed between the axis 12L of the input shaft 12 and one side of the reducer 1.

A disk-shaped drive gear 13B is formed on the other end of the transmission shaft 13. The drive gear 13B is a spur gear with spur teeth formed on the outer periphery. A second gear 5G (described later) provided on the reducer 1 meshes with the drive gear 13B. With the above configuration, the orthogonal input unit 11 can convert the rotational drive force input to the input shaft 12 into a rotational drive force in an orthogonal direction and input it to the reducer 1. That is, the input device 10 generates a rotational drive force by the transmission shaft 13 that rotates in conjunction with the input shaft 12 in a direction orthogonal to the input shaft 12 to which the rotation associated with the operation is transmitted.

The motor M is disposed adjacent to the orthogonal input unit 11 in the orthogonal direction of the transmission shaft 13 of the orthogonal input unit 11. The orthogonal input unit 11 is disposed outside the outer circumference of the motor M and in the orthogonal direction to the rotation axis ML of the shaft MS. The motor M inputs a rotational assist force to the reducer 1 in a direction that enhances the rotational driving force input to the reducer 1. The motor M is, for example, a DC brush motor. The motor M may be a DC brushless motor. The motor M may be any motor that can input a rotational assist force to the reducer 1. The motor M includes a housing M1 fixed to the case 11K. The housing M1 is formed in a cylindrical shape with one end closed and the other end open. One end of the housing M1 is closed by a lid M3 formed in a disk shape.

The other end of the housing M1 is closed by the end bell M2, which is formed in a disk shape. The end bell M2 is fixed to the case 11K. Permanent magnets G1, G2 are fixed along the inner circumferential surface of the housing M1. The rotor MR is disposed in the space surrounded by the inside of the housing M1 and the end bell M2. The rotor MR includes a cylindrical shaft MS and multiple coils MC provided on the shaft MS. One end of the shaft MS is rotatably supported at the center of the lid M3 via a bearing R3.

The other end of the shaft MS is rotatably supported via a bearing R3 at the center of the end bell M2. A cylindrical commutator (not shown), which serves as an electrical contact, is provided on the end bell M2 side of the shaft MS inside the housing M1. The end bell M2 is provided with a pair of brushes (not shown) that hold the commutator in between. A pair of conductors (not shown) that are electrically connected to electrodes of a power source (not shown) are connected to the pair of brushes. When electricity is applied to the pair of brushes from the power source, the rotor MR rotates. The commutator and pair of brushes may be provided on the lid M3 side.

The other end of the shaft MS is exposed from the end bell M2 to the reducer 1 side. A pinion gear MP is provided on the other end of the shaft MS. The pinion gear MP is a spur gear with spur teeth formed on the outer periphery. A second gear 5G (described later) provided on the reducer 1 meshes with the pinion gear MP. With the above configuration, the motor M rotates the rotor MR in a direction that increases the rotational driving force input to the second gear 5G provided on the reducer 1, and can input a rotational auxiliary force to the reducer 1. One side of the reducer 1 is fixed to the housing 11K. The reducer 1 receives the rotational driving force, reduces the rotation speed compared to the rotational driving force, and increases the torque to output the rotational force from the output section around the rotation axis. An output arm 30 is connected to the reducer 1, and rotates around the rotation axis by the rotational force output by the reducer 1.

As shown in Figures 2 and 3, the reducer 1 includes a cylindrical case 2 and a reduction mechanism 3 provided within the case 2. Internal teeth 2H are formed on the inner peripheral surface of the case 2. The internal teeth 2H are formed by a number of cylindrically formed pins 2P and pin grooves 2M formed with a substantially semicircular cross section that support the multiple pins 2P. The multiple pin grooves 2M are arranged along the inner peripheral surface when viewed from the central axis direction of the case 2.

The pin grooves 2M extend along the central axis direction on the inner peripheral surface of the case 2. Each pin 2P abuts against each pin groove 2M along the axial direction. The multiple pins 2P are arranged in multiple pin grooves 2M along the inner peripheral surface when viewed from the central axis direction of the case 2. With the above configuration, the multiple pins 2P form internal teeth 2H on the inner peripheral surface of the case 2 when viewed in the central axis direction.

The reduction mechanism 3 includes an input gear 4 that rotates at the center of the case 2. The input gear 4 includes, for example, an end plate 4D, a first shaft 4S connected to the end plate 4D, and a first gear 4G connected to the first shaft 4S. The first gear 4G is, for example, a pinion gear MP described below. The end plate 4D is formed, for example, in a disk shape. The end plate 4D and one end side of the first shaft 4S are connected concentrically with the axis 4L (rotation axis) of the first shaft 4S. The end plate 4D may not be necessary depending on the installation state of the reduction gear 1.

The first shaft 4S is formed in a cylindrical shape. The first shaft 4S is rotatably supported at the center of a first disk U1 and a second disk U2 formed in a disk shape. The first disk U1 is provided on one side of the reducer. The first disk U1 is fixed to the housing 11K. The second disk U2 is provided on the other side of the reducer. A first gear 4G formed in a disk shape having a predetermined number of spur teeth is connected to the other end of the first shaft 4S. For example, the first gear 4G side of the first shaft 4S is supported on the first disk U1 via a bearing B1.

The input gear 4 is supported, for example, on the end plate 4D side of the first shaft 4S via a bearing B2 on the second disk U2. The bearings B1 and B2 are ball bearings, roller bearings, etc. A plurality of spur gears 5 mesh with the periphery of the input gear 4. In this embodiment, three spur gears 5 are evenly arranged around the periphery of the input gear 4. Three or more spur gears 5 may be provided.

When one of the three spur gears 5 is driven to rotate, the input gear 4 rotates. The rotation of the input gear 4 causes the other two spur gears 5 to rotate in conjunction. The spur gear 5 includes, for example, a second gear 5G that meshes with the first gear 4G, a second shaft 5S that is concentrically connected to the second gear 5G, and a first eccentric cam 5M and a second eccentric cam 5N formed on the second shaft 5S.

One of the three second gears 5G meshes with the drive gear 13B and the pinion gear MP (first gear 4G) (see FIG. 1). That is, one of the three spur gears 5 receives a rotational driving force from the orthogonal input portion 11 and a rotational assist force from the motor M in a direction that enhances the rotational driving force, causing the second shaft 5S to rotate.

The second shaft 5S is formed in a cylindrical shape. One end of the second shaft 5S is rotatably supported by the second disk U2 via a bearing B4. The other end of the second shaft 5S is rotatably supported by the first disk U1 via a bearing B3.

The other end of the second shaft 5S and the second gear 5G are connected concentrically with the axis 5L (rotation axis) of the second shaft 5S. The second gear 5G is formed, for example, in a disk shape having a predetermined number of spur teeth. When the second gear 5G is rotationally driven by the first gear 4G, the second shaft 5S rotates in conjunction with it. A first eccentric cam 5M and a second eccentric cam 5N are integrally formed with the second shaft 5S. The first eccentric cam 5M and the second eccentric cam 5N are formed, for example, in a cylindrical shape. The first eccentric cam 5M is formed eccentrically with its central axis deviated from the axis 5L of the second shaft 5S.

The second eccentric cam 5N is formed eccentrically with its central axis offset from the axis 5L of the second shaft 5S. The eccentric direction of the second eccentric cam 5N is opposite to the eccentric direction of the first eccentric cam 5M. The first eccentric cam 5M and the second eccentric cam 5N rotate in conjunction with the second shaft 5S of the spur gear 5, which is connected to the spur gear 5. The first eccentric cam 5M drives the first eccentric gear 6 provided inside the case 2.

The first eccentric gear 6 is formed in a disk shape. A circular through hole 6D is formed around the central axis 6L of the first eccentric gear 6. The through hole 6D is formed to be larger than the diameter of the first shaft 4S. The first shaft 4S is inserted through the through hole 6D. The through hole 6D is formed to have a diameter that does not allow the first shaft 4S to come into contact when the first eccentric gear 6 rotates eccentrically, as described below.

External teeth 6C are formed along the outer periphery of the first eccentric gear 6. The external teeth 6C are partially meshed with the internal teeth 2H formed along the inner circumferential surface of the case 2. The external teeth 6C are formed, for example, with one or more teeth less than the internal teeth 2H. The first eccentric gear 6 rotates eccentrically about the axis 4L (rotation axis) of the input gear 4. The first eccentric gear 6 eccentrically rotates by rolling along the inner circumferential surface of the case 2 without slipping, with the external teeth 6C partially meshing with the internal teeth 2H.

The first eccentric gear 6 has, for example, three first through holes 6H that rotatably support three first eccentric cams 5M. The first through holes 6H are formed as circular openings. The first eccentric cams 5M are rotatably supported in the first through holes 6H via needle bearings B5. The first eccentric gear 6 has three second through holes 6K arranged between the three first through holes 6H. Three or more second through holes 6K may be formed depending on the number of first through holes 6H.

The second through hole 6K is formed symmetrically when viewed from the direction of the central axis 6L of the first eccentric gear 6, for example. The second through hole 6K has a thin-walled portion 6P, which is the area where the thickness between the second through hole 6K and the external teeth 6C is the thinnest. The second eccentric cam 5N drives the second eccentric gear 7 provided inside the case 2. The second eccentric gear 7 is formed in a disk shape.

A circular through hole 7D is formed around the central axis 7L of the second eccentric gear 7. The through hole 7D is formed to be larger than the diameter of the first shaft 4S. The first shaft 4S is inserted through the through hole 7D. The through hole 7D is formed to have a diameter that does not allow the first shaft 4S to come into contact when the second eccentric gear 7 rotates eccentrically, as described below. External teeth 7C are formed along the outer periphery of the second eccentric gear 7. The external teeth 7C are partially meshed with the internal teeth 2H formed along the inner circumferential surface of the case 2. The external teeth 7C are formed, for example, with one or more teeth less than the internal teeth 2H. The second eccentric gear 7 rotates eccentrically about the axis 4L (rotation axis) of the input gear 4.

The second eccentric gear 7 rotates eccentrically, rolling without slipping along the inner circumferential surface of the case 2 with its outer teeth 7C partially meshing with the inner teeth 2H. The second eccentric gear 7 rotates in conjunction with the first eccentric gear 6, and eccentrically rotates in the opposite direction to the eccentric direction of the first eccentric gear 6. The second eccentric gear 7 and the first eccentric gear 6 rotate in conjunction with each other, thereby maintaining balance in the reducer 1.

The second eccentric gear 7 has, for example, three first through holes 7H that rotatably support three second eccentric cams 5N. The first through holes 7H are formed as circular openings. The second eccentric cams 5N are rotatably supported in the first through holes 7H via needle bearings B6. The second eccentric gear 7 has three second through holes 7K arranged between the three first through holes 7H. Three or more second through holes 7K may be formed depending on the number of first through holes 7H.

The second through hole 7K is formed symmetrically when viewed from the direction of the central axis 7L of the second eccentric gear 7. The second through hole 7K has a thin-walled portion 7P, which is the area where the thickness between the second through hole 7K and the external teeth 7C is the thinnest.

A connecting shaft S is inserted through the second through holes 6K, 7K. One end of the connecting shaft S is connected to a second circular plate U2 that rotatably supports one end of the three second shafts 5S. The other end of the connecting shaft S is connected to a first circular plate U1 that rotatably supports the other end of the three second shafts 5S. Three connecting shafts S are provided corresponding to the three second through holes 6K, 7K.

The connecting shaft S has one end SA protruding from the second disc U2 through the second through holes 6K, 7K. The cross sections of the connecting shaft S, seen in the direction of the axis SL, at the one end SA side and the other end SB side, are formed into a cylindrical shape. The connecting shaft S has one end SA side supported by the second disc U2. The connecting shaft S has the other end SB side supported by the first disc U1. The connecting shaft S, for example, has a cross section, seen in the direction of the axis SL, formed symmetrically.

When viewed in the axial SL direction, the other end SB of the connecting shaft S is positioned on the first disc U1 by a pin SP. When viewed in the axial SL direction, the one end SA of the connecting shaft S may be positioned on the second disc U2 by a pin SP. The connecting shaft S is fixed to the housing 11K, for example, via the first disc U1. With the above configuration, the first disc U1, the connecting shaft S, and the second disc U2 are fixed to the housing 11K, and the case 2 rotates relative to the first disc U1, the connecting shaft S, and the second disc U2. The case 2 reduces the number of rotations compared to the rotational driving force input to the orthogonal input section 11, and increases the torque to output a rotational force around the axis 4L (rotation axis).

In conjunction with the rotation of the case 2, the output arm 30 connected to the case 2 rotates around the axis 4L (rotation axis). The output arm 30 is formed, for example, in a rod shape. The base end side of the output arm 30 is connected, for example, to the outer periphery of the case 2. The output arm 30 is connected to the reducer 1 so as to be rotatable around the axis 4L. In other words, the output arm 30 is connected to the reducer 1, and rotates within any angle range around the rotation axis ML due to the rotational force output by the reducer 1.

For example, a ball joint (not shown) is provided on the tip side of the output arm 30. The tip side of the output arm 30 is connected to a steering mechanism (not shown). The connection position of the output arm 30 on the case 2 is not limited to that shown in the figure, and may be connected to any position around the axis 4L (rotation axis) depending on the position of the connection target on the tip side. With the above configuration, the orthogonal input section 11 and the motor M of the input device 10 are not arranged in the outer circumferential direction of the case 2 of the reducer 1. With the above configuration, the output arm 30 can rotate without limiting the rotation range in the outer circumferential direction of the case 2 of the reducer 1. Therefore, the output arm 30 can be connected to any position in the outer circumferential direction of the case 2 of the reducer 1.

Next, the operation of the steering device W will be explained.

In the orthogonal input section 11, a rotational driving force according to operation is input to the input shaft 12. When the input shaft 12 rotates around the axis 12L, the first bevel gear 12A rotates in conjunction with it. When the first bevel gear 12A rotates, the second bevel gear 13A meshing with the first bevel gear 12A rotates in conjunction with it. When the second bevel gear 13A rotates, the transmission shaft 13 rotates in conjunction with it around the axis 13L that is perpendicular to the axis 12L of the input shaft 12.

When the input gear 4 rotates, the first gear 4G rotates around the axis 4L in conjunction with the first gear 4G via the first shaft 4S. A plurality of second gears 5G meshing with the first gear 4G rotate around the axis 5L in conjunction with the first gear 4G. When the second gear 5G rotates, the second shaft 5S rotates in conjunction with the second gear 4G. In conjunction with the rotation of the second shaft 5S, the first eccentric cam 5M and the second eccentric cam 5N rotate eccentrically around the axis 5L.

In conjunction with the rotation of the first eccentric cam 5M, the first eccentric gear 6 rotates eccentrically around the axis 4L along the inner circumferential surface of the case 2. In conjunction with the rotation of the second eccentric cam 5N, the second eccentric gear 7 rotates eccentrically around the axis 4L along the inner circumferential surface of the case 2. The second eccentric gear 7 rotates with a half-turn shift from the rotation of the first eccentric gear 6. In conjunction with the rotation of the first eccentric gear 6 and the second eccentric gear 7, the first disc U1 and the second disc U2 simultaneously rotate relative to the case 2 around the axis 4L.

The first disk U1 and the second disk U2 are fixed to the housing 11K. Therefore, the case 2 rotates around the axis 4L relative to the first disk U1 and the second disk U2. The case 2 rotates at a lower rotational speed compared to the rotational speed of the end plate 4D.

When the multiple spur gears 5 rotate around the axis 5L, the first eccentric gear 6 and the second eccentric gear 7 move eccentrically around the axis 4L in conjunction with the rotation of the multiple spur gears 5. At this time, the connecting shaft S moves relatively along the shape of the inner circumference of the second through hole 6K of the first eccentric gear 6 without contacting the inner circumference of the second through hole 6K. Similarly, the connecting shaft S moves relatively along the shape of the inner circumference of the second through hole (not shown) of the second eccentric gear 7 without contacting the inner circumference of the second through hole.

In conjunction with the eccentric motion of the first eccentric gear 6 and the second eccentric gear 7, the case 2 rotates about the axis 4L relative to the first disk U1 and the second disk U2. The case 2 rotates at a lower rotation speed than the input gear 4. When a rotating object that transmits rotational output is connected to the case 2, a rotational output that is slower and has increased torque compared to the input gear 4 is obtained. In conjunction with the rotation of the case 2, the output arm 30 rotates about the axis 4L. The output arm 30 rotates without restriction within its rotation range.

As described above, with the steering device W, the orthogonal input section 11 is disposed outside the outer periphery of the motor M and perpendicular to the rotation axis ML of the MS, so that the device configuration can be made compact in the radial direction of the reducer 1. With the steering device W, the orthogonal input section 11 and the motor M are not disposed within the rotation range of the output arm 30 in the circumferential direction of the reducer 1, so that the output arm 30 can rotate without restriction within the rotation range.

Among the embodiments disclosed in this specification, those that are composed of multiple objects may be integrated, and conversely, those that are composed of a single object may be separated into multiple objects. Regardless of whether they are integrated or not, it is sufficient that the object of the invention can be achieved. Note that the present invention is not limited to the above-mentioned embodiment, and includes various modifications of the above-mentioned embodiment without departing from the spirit of the present invention. For example, the transmission shaft 13 and the motor M may drive not only the spur gear 5 but also the input gear 4.

1 Reducer, 2 Case, 2H Internal teeth, 2M Pin groove, 2P Pin, 3 Reduction mechanism, 4 Input gear, 4D End plate, 4G First gear, 4L Axis, 4S First shaft, 5 Spur gear, 5G Second gear, 5L Axis, 5M First eccentric cam, 5N Second eccentric cam, 5S Second shaft, 6 First eccentric gear, 6C External teeth, 6D Through hole, 6H First through hole, 6K Second through hole, 6L Central shaft, 6P Thin walled portion, 7 Second eccentric gear, 7C External teeth, 7D Through hole, 7H First through hole, 7K Second through hole, 7L Central shaft, 7P Thin walled portion, 10 Input device, 11 Orthogonal input portion, 11K Housing, 12 Input shaft, 12A First bevel gear, 12L Axis, 13 Transmission shaft, 13A second bevel gear, 13B driving gear, 13L axis, 30 output arm, B1-B4 bearings, B5, B6 needle bearings, G1, G2 permanent magnets, M motor, M1 housing, M2 end bell, M3 cover, MC coil, ML rotating shaft, MP pinion gear, MR rotor, MS shaft, R1-R3 bearing, S connecting shaft, SA one end, SB other end, SL shaft, SP pin, U1 first disc, U2 second disc, W steering device

Claims (3)

an input device that generates a rotational driving force by a transmission shaft that rotates in conjunction with an input shaft in a direction perpendicular to the input shaft to which rotation associated with an operation is transmitted;
a reducer that receives the rotational driving force from the input device disposed on one side, reduces the number of rotations compared to the rotational driving force, and increases the torque to output a rotational force about a rotation axis;
a motor that is disposed on the one surface side adjacent to the transmission shaft in a direction perpendicular to the transmission shaft and inputs a rotation assist force to the reducer in a direction to increase the rotation driving force;
an output arm connected to the reducer and configured to rotate around the rotation shaft within an arbitrary angle range by the rotational force;
Equipped with
The input device includes a housing that houses the input shaft and the transmission shaft,
the reducer is disposed such that the one surface side of the reducer is fixed to the housing,
The motor includes a housing fixed to the enclosure.
A steering device , wherein the housing is arranged side by side with the casing in a direction perpendicular to the transmission shaft, and is arranged on the one side . The reduction gear includes an input gear,
a plurality of spur gears that receive the rotational driving force and rotate in mesh with the input gear;
a plurality of eccentric cams formed on a plurality of shafts respectively connected to the plurality of spur gears;
an eccentric gear that rotates eccentrically with respect to a rotation shaft of the input gear;
a case to which the output arm is connected and to which the eccentric gear rotates eccentrically around the rotation shaft along an inner circumferential surface thereof, and outputs rotation at a rotation speed reduced compared to the rotation speed of the spur gear.
The steering system according to claim 1. an input device for inputting a rotational driving force according to an operation;
a reducer that receives the rotational driving force, reduces a rotational speed compared to the rotational driving force, and increases a torque to output a rotational force about a rotation shaft;
an output arm connected to the reducer and rotated about the rotation shaft by the rotational force,
The input device is disposed on one side of the reducer,
an input shaft for inputting the rotational driving force;
an orthogonal input unit including a transmission shaft that rotates in conjunction with the input shaft in a direction orthogonal to the input shaft and inputs the rotational driving force to the reducer;
a motor arranged adjacent to the orthogonal input portion in a direction perpendicular to the transmission shaft and configured to input a rotation assist force to the reducer in a direction to increase the rotational driving force,
The output arm is rotatably connected to the reducer without any restriction on the rotation range.
Steering gear.

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