CN112744291B

CN112744291B - Hydraulic motor and steering column with same

Info

Publication number: CN112744291B
Application number: CN201911063160.XA
Authority: CN
Inventors: 何锡阳; 赵瑛; 潘洪明
Original assignee: BYD Co Ltd; Shanwei BYD Automobile Co Ltd
Current assignee: BYD Co Ltd; Shanwei BYD Automobile Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2022-05-13
Anticipated expiration: 2039-10-31
Also published as: CN112744291A

Abstract

The invention provides a hydraulic motor and a steering column with the same. The hydraulic motor comprises a shell, two driving gears, two speed change mechanisms, a driving shaft and two output shafts, an oil duct is arranged in the shell, a driving cavity and two speed change cavities, the two speed change mechanisms are arranged in the two speed change cavities respectively, liquid can enter the driving cavity through the outlet of the oil duct to drive the two driving gears to rotate, two opposite ends of the driving shaft are connected with the two speed change mechanisms respectively, the driving shaft extends through the axis of one driving gear and is fixedly connected with the driving gear, the two output shafts extend out of the shell, and the two output shafts are connected with the two speed change mechanisms respectively. According to the hydraulic motor of this application, the structure is regular, is convenient for install and arranges, can establish ties to the drive mechanism that needs both ends output in.

Description

Hydraulic motor and steering column with same

Technical Field

The present invention relates generally to the field of motors, and more particularly to a hydraulic motor and a steering column having the same.

Background

A hydraulic motor is an actuator of a hydraulic system, and the hydraulic motor is capable of converting hydraulic pressure energy into mechanical energy of an output shaft of the hydraulic motor. Liquids are media that transmit forces and motions. However, the existing hydraulic motors have scattered structures and large floor space.

Accordingly, it is desirable to provide a hydraulic motor and a steering column having the same to partially solve the above problems.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

In order to partially solve the above-described problems, according to a first aspect of the present invention, there is provided a hydraulic motor including:

the oil-gas transmission device comprises a shell, a plurality of oil passages and a plurality of oil-gas transmission pipes, wherein a driving cavity, two oil passages and two speed change cavities are arranged in the shell, and outlets of the two oil passages are arranged on the cavity wall of the driving cavity;

the two driving gears are meshed with each other and are arranged in the driving cavity, the outlet of at least one of the two oil passages corresponds to the mutually meshed positions of the two driving gears, and liquid can enter the driving cavity through the outlet corresponding to the mutually meshed positions of the two driving gears to drive the two driving gears to rotate;

two speed change mechanisms respectively arranged in the two speed change cavities;

the two ends of the driving shaft, which are opposite to each other in the axial direction of the driving shaft, are respectively connected with the two speed change mechanisms, and the driving shaft extends through the axis of one of the two driving gears and is fixedly connected with the driving gear; and

the two output shafts extend out of the shell, and are respectively connected with the two speed change mechanisms.

According to the hydraulic motor of this application, hydraulic motor includes two speed change mechanism and two output shafts, and two speed change mechanism are connected with the opposite both ends of the axial direction of driving shaft along the driving shaft respectively, and two output shafts are connected with two speed change mechanism respectively, and like this, hydraulic motor's structure is regular, is convenient for install and arrange, can establish ties to the drive mechanism of needs both ends output in.

Optionally, the two oil ducts include a first oil duct and a second oil duct, the first oil duct includes a first outlet, the second oil duct includes a second outlet, and the first outlet and the second outlet are respectively located at two opposite ends of the driving cavity and both correspond to the mutually-meshed positions of the two driving gears. Therefore, the driving gear can be driven to rotate forwards or backwards.

Optionally, the first oil passage further includes a first inlet, the second oil passage further includes a second inlet, and the first inlet and the second inlet are both disposed on the outer surface of the housing and arranged side by side. Thereby making the housing compact.

Optionally, the variable speed cavity further comprises two lubricating oil passages, the two lubricating oil passages are both communicated with the same fluid in the two oil passages, and outlets of the two lubricating oil passages are respectively arranged on the cavity walls of the two variable speed cavities. This allows lubrication of the gear shifting mechanism.

Optionally, a damping structure is provided in the lubricating oil passage to reduce the pressure of the liquid. Thereby avoiding the high-pressure liquid from damaging the transmission.

Optionally, the driving cavity is in communication with the shift cavity via a through hole through which the driving shaft extends, and a seal is provided along a circumferential direction of the through hole. Thereby preventing liquid in the active cavity from entering the shift cavity.

Optionally, the direction of rotation of the two output shafts is the same. Thus ensuring that the two output shafts rotate synchronously.

Optionally, the shifting mechanism comprises:

the inner gear ring is arranged on the cavity wall of the speed change cavity;

the sun gear is connected with the driving shaft, so that the driving shaft drives the sun gear to rotate;

the planet gear is respectively meshed with the sun gear and the inner gear ring; and

the planet carrier is connected with the planet wheel and the output shaft, and the rotating speed of the output shaft is smaller than that of the driving shaft.

Therefore, the rotating speed of the output shaft is less than that of the driving shaft, and the effect of transmitting low rotating speed and large torque can be realized.

The invention also provides a steering column, which comprises the hydraulic motor.

According to the utility model provides a steering column, steering column includes hydraulic motor, and hydraulic motor includes two speed change mechanism and two output shafts, and two speed change mechanism are connected with the opposite both ends of the axial direction of driving shaft along the driving shaft respectively, and two output shafts are connected with two speed change mechanism respectively, and like this, hydraulic motor's structure is regular, is convenient for install and arrange, can establish ties to the drive mechanism of needs both ends output in.

Optionally, the steering column further comprises an upper column and a lower column, the upper column being connected to one of the two output shafts, and the lower column being connected to the other of the two output shafts. Therefore, synchronous steering of the upper pipe column and the lower pipe column can be realized.

Drawings

The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles and apparatus of the invention. In the drawings, there is shown in the drawings,

FIG. 1 is a schematic diagram of a hydraulic motor according to a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of the hydraulic motor shown in FIG. 1;

FIG. 3 is a cross-sectional view taken along line A-A in FIG. 2;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 5 is a schematic structural view of a steering column in accordance with a preferred embodiment of the present invention; and

fig. 6 is a schematic view showing the structure of the steering column shown in fig. 5 coupled with wheels.

Description of reference numerals:

100: the hydraulic motor 110: shell body

111: top wall 112: bottom wall

113: outer peripheral wall 114: active cavity

115: the connecting wall 116: speed-changing cavity

117: damping oil passage 118: sealing element

121: left driving gear 122: right driving gear

123: connecting shaft 124: driving shaft

125: active bearing 131: first oil duct

132: first inlet 133: first outlet

134: second oil passage 135: the second inlet

136: second outlet 137: a first oil delivery pipe

138: the second oil delivery pipe 139: lubricating oil passage

140: the speed change mechanism 141: inner gear ring

142: sun gear 143: planet wheel

144: carrier 145: connecting plate

146: gear shaft 151: output shaft

152: output bearing 153: dust ring

200: the steering column 201: upper pipe column

202: the lower pipe column 203: steering wheel

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.

In the following description, for purposes of explanation, specific details are set forth in order to provide a thorough understanding of the present invention. It is apparent that the practice of the invention is not limited to the specific details set forth herein as are known to those of skill in the art. The following detailed description of the preferred embodiments of the present invention, however, the present invention may have other embodiments in addition to the detailed description, and should not be construed as being limited to the embodiments set forth herein.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, as the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. When the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The terms "upper", "lower", "front", "rear", "left", "right" and the like as used herein are for purposes of illustration only and are not limiting.

Ordinal words such as "first" and "second" are referred to herein merely as labels, and do not have any other meaning, such as a particular order, etc. Also, for example, the term "first component" does not itself imply the presence of "second component", and the term "second component" does not itself imply the presence of "first component".

In the following, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings, which illustrate representative embodiments of the invention and do not limit the invention.

The application discloses hydraulic motor, hydraulic motor's output shaft can rotate and the rotational speed of output shaft is controllable. Specifically, as shown in fig. 2, the hydraulic motor 100 disclosed in the present application includes a housing 110 and two driving gears (a left driving gear 121 and a right driving gear 122) that are engaged with each other and are both disposed in the housing 110, and a fluid can drive the two driving gears to rotate. Preferably, the liquid may be hydraulic oil, and the hydraulic motor 100 may be in fluid communication with an oil storage device such that the hydraulic oil in the oil storage device enters the hydraulic motor 100. Of course, the liquid may also be another medium, which is not intended to be limiting in this application.

The specific structure of the hydraulic motor 100 is described below.

As shown in fig. 2, 3 and 5, the housing 110 is substantially cylindrical and a cavity is provided in the housing 110. The housing 110 may include a top wall 111, a bottom wall 112, and an outer peripheral wall 113, a top end of the outer peripheral wall 113 being connected to the top wall 111, and a bottom end of the outer peripheral wall 113 being connected to the bottom wall 112. The cross-sectional shapes of the top wall 111 and the bottom wall 112 may be substantially circular in a plane perpendicular to the axial direction of the housing 110. The outer peripheral wall 113 may be provided along the circumferential direction of the housing 110.

Two oil passages may be provided in the housing 110 to allow the liquid to enter the cavity via the two oil passages, respectively. Both oil passages may include an inlet and an outlet, and the respective inlets of both oil passages may be provided on the outer peripheral wall 113.

Specifically, the two oil passages may include the first oil passage 131 and the second oil passage 134, and the hydraulic oil does not simultaneously enter the first oil passage 131 and the second oil passage 134. When the oil storage device delivers hydraulic oil to the first oil passage 131, the oil storage device does not deliver hydraulic oil to the second oil passage. When the oil storage device delivers hydraulic oil to the second oil passage 134, the oil storage device does not deliver hydraulic oil to the first oil passage.

The direction in which the hydraulic oil in the first oil passage 131 drives the rotation of the drive gear is different from the direction in which the hydraulic oil in the second oil passage 134 drives the rotation of the drive gear. In the present embodiment, "the first oil passage" and "the second oil passage" mean that hydraulic oil can enter into two different oil passages, respectively, and do not represent a specific rotational direction of the drive gear.

For example, hydraulic oil in the first oil passage 131 can drive the drive gear in a forward direction, and hydraulic oil in the second oil passage 134 can drive the drive gear in a reverse direction. Of course, depending on the arrangement of the two gears, the hydraulic oil in the first oil passage 131 can also drive the driving gear to rotate in the reverse direction, and the hydraulic oil in the second oil passage 134 can drive the driving gear to rotate in the forward direction.

As shown in fig. 1 and 3, the first oil passage 131 includes a first inlet 132 and a first outlet 133, the first inlet 132 may be provided on an outer surface of the outer circumferential wall 113 of the housing 110, and the first inlet 132 may be in fluid communication with the oil storage device through a first oil delivery pipe 137 such that hydraulic oil in the oil storage device can enter the first oil passage 131 via the first inlet 132.

The second oil passage 134 may include a second inlet port 135 and a second outlet port 136, the second inlet port 135 may be provided on an outer surface of the outer circumferential wall 113 of the housing 110, and the second inlet port 135 may be in fluid communication with the oil storage device through a second oil delivery pipe 138, so that hydraulic oil in the oil storage device can be introduced into the second oil passage 134 via the second inlet port 135.

In order to save space, as shown in connection with fig. 5, first inlet 132 and second inlet 135 may be arranged side by side in the axial direction of housing 110, so that first oil delivery pipe 137 and second oil delivery pipe 138 can be arranged side by side in the axial direction of housing 110, thereby facilitating assembly.

Returning now to fig. 2 and 3, the cavity in the housing 110 may include a drive cavity 114 with both drive gears disposed in the drive cavity 114. The first outlet 133 of the first oil passage 131 and the second outlet 136 of the second oil passage 134 may be both disposed on the cavity wall of the active cavity 114. The first outlet 133 of the first oil passage 131 and the second outlet 136 of the second oil passage 134 may be respectively located at opposite ends of the driving cavity 114 in a radial direction of the driving gear, so that hydraulic oil enters the driving cavity 114 through one outlet and hydraulic oil in the driving cavity 114 enters the oil passages through the other outlet, thereby reducing energy loss.

Further, a connecting wall 115 may be further provided in the housing 110, and the connecting wall 115 may be parallel to both the top wall 111 and the bottom wall 112 in the axial direction of the housing 110. The circumferential edge of the connecting wall 115 may be connected to the inner surface of the outer circumferential wall 113. An active cavity 114 may be provided in the connecting wall 115.

The two driving gears include a left driving gear 121 and a right driving gear 122, the left driving gear 121 and the right driving gear 122 are engaged with each other, and the number of teeth of the left driving gear 121 and the right driving gear 122 may be the same, so that the two driving gears stably rotate, and energy loss is reduced. The hydraulic motor 100 further includes a connecting shaft 123, the connecting shaft 123 may extend through the axial center of the left driving gear 121 and be fixedly connected to the left driving gear 121, and the connecting shaft 123 may be rotatably connected to the connecting wall 115 by a connecting bearing. The central axis of the connecting shaft 123 may coincide with the central axis of the left driving gear 121 to ensure the stability of the rotation of the left driving gear 121.

Hydraulic motor 100 further includes a drive shaft 124, and drive shaft 124 may extend through the axial center of right drive gear 122 and be fixed to right drive gear 122. The connecting wall 115 is provided with a through hole through which the driving shaft may extend, and the driving shaft 124 may be rotatably connected with the connecting wall 115 by a driving bearing 125.

The active bearing 125 can also support the active shaft 124, thereby enhancing the coupling strength of the active shaft 124 and the coupling wall 115. The hydraulic motor 100 may include two active bearings 125, and the two active bearings 125 may be respectively located at both ends of the active cavity 114 in an axial direction of the active shaft 124 to stably support the active shaft 124. The central axis of the driving shaft 124 may coincide with the central axis of the right driving gear 122 to ensure the stability of the rotation of the right driving gear 122.

Further, in order to ensure the stability of the overall operation of the hydraulic motor 100, the central axis of the driving shaft 124 may also coincide with the central axis of the housing 110. Thus, the hydraulic oil can drive the two drive gears to rotate, thereby rotating the drive shaft 124. The rotation direction of the right driving gear 122 may be the same as the rotation direction of the driving shaft 124. Of course, in an embodiment not shown in the drawings, the driving shaft may be fixedly connected to the left driving gear, so that the left driving gear drives the driving shaft to rotate.

As shown in fig. 3, the active cavity 114 may be a closed cavity. The outer edges of the teeth of the two driving gears in the radial direction of the housing 110 may be closely attached to the cavity wall of the driving cavity 114 to separate the hydraulic oil at the first outlet 133 and the second outlet 136, so as to avoid mixing of the hydraulic oil at the outlets of the two oil passages. The first outlet 133 and the second outlet 136 may be disposed at opposite ends of the driving cavity 114, respectively, to drive the driving gear to rotate.

As shown in fig. 3, the outlet of at least one of the first oil passage 131 and the second oil passage 134 corresponds to a position of the two drive gears that are meshed with each other. For example, in the first preferred embodiment, the first outlet 133 of the first oil passage 131 may correspond to a position of mutual engagement of the left driving gear 121 and the right driving gear 122. Hydraulic oil from the first oil passage 131 may enter the driving cavity 114 via the first outlet 133 to build pressure, thereby driving the left and right driving gears 121 and 122 to rotate. Meanwhile, the left driving gear 121 and the right driving gear 122 can also perform a pressure relief function on hydraulic oil. The second outlet 136 of the second oil passage 134 may not correspond to a position of mutual engagement of the left driving gear 121 and the right driving gear 122. The depressurized hydraulic oil may enter the second oil passage 134 via the second outlet 136 and may be finally discharged from the housing 110 via the second inlet 135.

In a second preferred embodiment, the second outlet 136 of the second oil passage 134 may correspond to a position where the left driving gear 121 and the right driving gear 122 are engaged with each other, and hydraulic oil from the second oil passage 134 may enter the driving cavity 114 through the second outlet 136 to build pressure, thereby driving the left driving gear 121 and the right driving gear 122 to rotate. The first outlet 133 of the first oil passage 131 may not correspond to the position where the left driving gear 121 and the right driving gear 122 are engaged with each other, and the decompressed hydraulic oil may enter the first oil passage 131 through the first outlet 133 and finally be discharged from the housing 110 through the first inlet 132.

In the third preferred embodiment, as shown in fig. 3, the first outlet 133 of the first oil passage 131 and the second outlet 136 of the second oil passage 134 may each correspond to a position of the left driving gear 121 and the right driving gear 122 where they are engaged with each other. The first outlet 133 and the second outlet 136 may be oppositely disposed in a radial direction of the housing 110. Thus, the first oil passage 131 and the second oil passage 134 can each separately deliver hydraulic oil into the driving cavity 114 to drive the two driving gears in forward or reverse rotation. When one of the two oil passages delivers hydraulic oil into the driving cavity 114, the other of the two oil passages discharges the hydraulic oil in the driving cavity 114. The first outlet 133 may function to both deliver hydraulic oil into the active cavity 114 and to drain hydraulic oil from the active cavity 114. Of course, the second outlet 136 functions similarly to the first outlet 133 and will not be described in detail herein.

The "inlet" of the present embodiment refers to a port through which the liquid enters the inside of the housing 110 from the outside of the housing 110, and does not represent that the liquid flow direction is a fixed direction of flowing from the "inlet" to the "outlet". The liquid in the active cavity 114 may also enter the oil passage through the "outlet" and then be discharged to the outside of the housing 110 through the "inlet".

As shown in fig. 1 and 2, the hydraulic motor 100 further includes two speed change mechanisms 140 and two output shafts 151, the cavity of the housing 110 further includes two speed change cavities 116, the two speed change mechanisms 140 are respectively disposed in the two speed change cavities 116, two ends of the driving shaft 124 opposite to each other in the axial direction of the driving shaft 124 are respectively connected to the two speed change mechanisms 140, and the two output shafts 151 are respectively connected to the two speed change mechanisms 140. To ensure that the axle shaft 124 can be coupled to the shifting mechanism 140, the through-hole of the connecting wall 115 can communicate between the axle cavity 114 and the shifting cavity 116 to allow the axle shaft 124 to extend into the shifting cavity 116.

Both output shafts 151 can extend out through the housing 110. The top wall 111 of the housing 110 may be provided with an opening, and one of the two output shafts 151 may extend through the opening of the top wall 111. The bottom wall 112 of the housing 110 may also be provided with an opening, and the other of the two output shafts 151 may extend through the opening of the bottom wall 112. In this way, both output shafts 151 can output torque, and both output shafts 151 can be connected with an external part, and the output shafts 151 are rotationally stable, thereby being applied to a plurality of different fields. To facilitate connection of output shaft 151 with external components, the free end of output shaft 151 may include a spline or spline housing.

An output bearing 152 may be disposed between the output shaft 151 and the top wall 111 for supporting the output shaft 151. Further, in order to prevent dust outside the housing 110 from entering the inside of the housing 110, especially, in order to prevent dust from entering the speed change cavity 116, a dust ring 153 may be provided between the output shaft 151 and the top wall 111, and the dust ring 153 may be located closer to the outside of the housing 110 than the output bearing 152.

According to the hydraulic motor 100 of the present application, the hydraulic motor 100 includes two speed change mechanisms 140 and two output shafts 151, the two speed change mechanisms 140 are respectively connected to two opposite ends of the driving shaft 124 along the axial direction of the driving shaft 124, and the two output shafts 151 are respectively connected to the two speed change mechanisms 140, so that the structure of the hydraulic motor 100 is regular, and is convenient to install and arrange, and can be connected in series to a transmission mechanism requiring two-end output.

The specific structure of the shifting mechanism 140 will be described below.

The specific structures of the two shifting mechanisms 140 are the same, and for the sake of simplicity of the page, the specific structure of one shifting mechanism 140 will be described as an example.

The variator 140 can be used to reduce the speed of the output of the primary shaft 124 such that the rotational speed of the two output shafts 151 is less than the rotational speed of the primary shaft 124.

The speed change mechanism 140 may be configured as a planetary gear speed reduction mechanism. The transmission mechanism 140 includes an annular gear 141, a sun gear 142, planet gears 143, and a carrier 144, and one end of the driveshaft 124 in the axial direction of the driveshaft 124 is capable of extending through the axis of the sun gear 142 and is fixedly connected to the sun gear 142. The hydraulic oil drives the two drive gears to rotate, thereby driving the drive shaft 124 to rotate, and further driving the sun gear 142 to rotate. The central axis of the sun gear 142 may coincide with the central axis of the axle shaft 124 to ensure stability of the gear rotation.

The ring gear 141 is provided on the wall of the shift cavity 116. Alternatively, the ring gear 141 may be rigidly connected to the wall of the shift cavity 116 to prevent the ring gear 141 from falling off the housing 110. Preferably, the ring gear 141 may be integrally formed with the cavity wall of the shift cavity 116 to reduce assembly steps. The planet gears 143 are engaged with the sun gear 142 and the ring gear 141, respectively, so that the planet gears 143 can rotate within the ring gear 141 around the circumferential direction of the sun gear 142.

The planet carrier 144 is used to connect the planet wheels 143 with the output shaft 151, and the central axis of the output shaft 151 may coincide with the central axis of the drive shaft 124. Thus, the sun gear 142 and the planet gears 143 are geared together to form a gear pair, and have a certain reduction ratio, so that the rotation speed of the output shaft 151 is lower than that of the input shaft 124. The hydraulic motor 100 of the present application includes two output shafts 151, and the power of the two output shafts 151 is derived from two driving gears in the housing 110, so that the hydraulic motor 100 of the present application does not need to be externally connected with an input shaft for power input.

Alternatively, as shown in fig. 2 and 4, the speed change mechanism 140 may further include at least two planetary wheels 143, and the planet carrier 144 includes a connecting plate 145 and at least two gear shafts 146, the connecting plate 145 being used to connect the output shaft 151 and the at least two gear shafts 146. The output shaft 151 and the at least two gear shafts 146 are respectively disposed on opposite sides of the connection plate 145. The at least two gear shafts 146 are used for connecting the at least two planet wheels 143, respectively. At least two planet wheels 143 may be spaced around the sun wheel 142 in the circumferential direction, so as to have a certain reduction ratio to achieve the purpose of speed reduction.

Specifically, as shown in fig. 4, the speed change mechanism 140 may include four planetary wheels 143, and the planet carrier 144 may include four gear shafts 146, the four gear shafts 146 being respectively connected to the four planetary wheels 143, the four planetary wheels 143 being disposed at intervals around the circumferential direction of the sun gear 142. The gear shaft 146 can extend through the axis of the planet 143 and is fixedly connected to the planet 143. Therefore, after the sun gear 142 rotates for a plurality of circles, the planet gear 143 rotates for one circle in the internal gear 141, and a certain speed reduction purpose is achieved.

Hydraulic oil enters the drive cavity 114 to drive the left drive gear 121 and the right drive gear 122 to rotate. The driving shaft 124 extends through the axial center of the right driving gear 122 and is fixedly connected with the right driving gear 122, so that the right driving gear 122 drives the driving shaft 124 to rotate, and the driving shaft 124 rotates to transmit the rotation speed and the torque. The rotational speed of the drive shaft 124 may be the same as the rotational speed of the right drive gear 122.

One end of the driving shaft 124 in the axial direction of the driving shaft 124 can extend through the axial center of the sun gear 142 and is fixedly connected with the sun gear 142, so that the driving shaft 124 drives the sun gear 142 to rotate, and the rotation speed of the sun gear 142 can be the same as the rotation speeds of the driving shaft 124 and the right driving gear 122. The inner gear ring 141 is arranged on the housing 110, the sun gear 142 is connected with the gear pair of the planet gear 143, the planet gear 143 is connected with the gear pair of the inner gear ring 141, and the sun gear 142 drives the planet gear 143 to rotate in the inner gear ring 141. The planet carrier 144 comprises a connecting plate 145 and a gear shaft 146, the gear shaft 146 can extend through the axle center of the planet wheel 143 and is rigidly connected with the planet wheel 143, and the connecting plate 145 is used for connecting the gear shaft 146 and the output shaft 151. The planet gears 143 rotate the planet carrier 144 within the ring gear 141, which in turn rotates the output shaft 151.

Because sun gear 142 and planet wheel 143 are the gear pair transmission, have certain reduction ratio, like this, sun gear 142 rotates N rings, and planet wheel 143 just rotates the round, reaches certain speed reduction purpose.

Further, two planetary gear reduction mechanisms are integrated in the housing 110, so that the speed of the driving shaft 124 at a high rotation speed is reduced and then output to the two output shafts 151, respectively. Thus, the hydraulic motor 100 of the present application includes two output shafts 151, and is applied to a wide range unlike a conventional motor including only one output shaft.

The two speed change mechanisms 140 may be symmetrically arranged in the axial direction of the drive shaft 124 with respect to the drive gear, and the specific structures of the two speed change mechanisms 140 are the same. Thus, as shown in fig. 1, the central axes of the two output shafts 151 coincide with each other, and the two output shafts 151 rotate in the same direction, so as to ensure synchronous rotation of the external components connected to the output shafts 151. An embodiment in which the steering column is an external component will be described later.

In order to reduce the wear of the sun gear 142, the planet gears 143, and the ring gear 141, the hydraulic motor 100 further includes two lubricating oil passages 139, and both of the two lubricating oil passages 139 are in fluid communication with the same one of the two oil passages to ensure that the pressures of the hydraulic oil entering the two shifting cavities 116 are kept the same. Alternatively, as shown in fig. 2, two lubricating oil passages 139 may be provided in parallel and may both be in fluid communication with the second oil passage 134, and hydraulic oil in the second oil passage 134 may enter the two lubricating oil passages 139. The extending direction of the two lubricating oil passages 139 may be substantially parallel to the axial direction of the axle shaft 124. The two lubricating oil passages 139 each include a lubricating outlet, and the two lubricating outlets are respectively provided on the cavity walls of the two speed change cavities 116 to supply hydraulic oil to the speed change cavities 116, thereby performing lubricating and heat dissipating functions on the sun gear 142, the planet gear 143, the ring gear 141, the planet carrier 144, and the like.

Since the oil storage device can deliver high-pressure hydraulic oil to the second oil passage 134, a damping structure is further provided in the lubricating oil passage 139 to reduce the pressure of the hydraulic oil. Preferably, the damping structure may be configured as a damping oil passage 117, the damping oil passage 117 being serially connected in the lubricating oil passage 139 and the damping oil passage 117 having a smaller diameter than the lubricating oil passage 139. In this way, the damping oil passage 117 can let a small amount of hydraulic oil in and reduce the pressure of the hydraulic oil by resistance so that the pressure of the hydraulic oil in the speed change cavity 116 is low pressure.

Further, two shift cavities 116 are respectively located at both ends of the driving shaft 124 in the axial direction of the driving shaft 124, and the driving cavity 114 and the connecting wall 115 are located between the two shift cavities 116. The drive shaft 124 can extend through the connecting wall 115, and the first and

second oil passages

131 and 134 can each deliver hydraulic oil into the drive cavity 114. In order to prevent the hydraulic oil in the driving cavity 114 from entering the shifting cavity 116, a seal 118 is provided between the driving shaft 124 and the connecting wall 115, and the seal 118 may be provided along the circumferential direction of the through hole of the connecting wall 115.

Preferably, the seal 118 may be configured as a seal to prevent hydraulic oil in the active cavity 114 from entering the shift cavity 116 and to prevent lubrication oil in the shift cavity 116 from entering the active cavity 114 to avoid mixing of the fluid in the active cavity 114 and the shift cavity 116. Further, in order to prevent the lubrication in the transmission cavity 116 from leaking to the outside of the housing, a seal 118 may also be provided between the output shaft 151 and the top wall 111, and the seal 118 may also be configured as a seal ring, which may be provided between a dust seal 153 and the output bearing 152, thereby facilitating the arrangement.

Further, the oil reservoir may supply hydraulic oil to the driving cavity 114 through the first and

second oil passages

131 and 134, respectively, so as to rotate the driving gear in the forward or reverse direction, and thus rotate the output shaft 151 in the forward or reverse direction. Meanwhile, the hydraulic motor 100 of the present application includes two output shafts 151, and therefore, the hydraulic motor 100 of the present application has a bidirectional rotation function, and hydraulic oil may cause the rotation direction of the output shafts 151 to be different through the inlets of different oil passages.

The oil reservoir may also not supply hydraulic oil to the hydraulic motor 100, and since the two output shafts 151 are connected to each other by a plurality of gears and shafts inside the housing 110, the rotation directions of the two output shafts 151 are the same. The external component can control one of the two output shafts 151 to rotate, so as to control the other of the two output shafts 151 to rotate, thereby realizing linkage of the two output shafts 151.

As shown in fig. 5, the present application also provides a steering column 200, the steering column 200 including the hydraulic motor 100 described above. The hydraulic motor 100 of the present application may be applied to a hydraulic control system for automatic steering as an actuator for automatic steering.

According to the steering column 200 of the present application, the steering column 200 includes the hydraulic motor 100. The hydraulic motor 100 comprises two speed change mechanisms 140 and two output shafts 151, the two speed change mechanisms 140 are respectively connected with two opposite ends of the driving shaft 124 in the axial direction of the driving shaft 124, and the two output shafts 151 are respectively connected with the two speed change mechanisms 140, so that the structure of the hydraulic motor 100 is regular and convenient to mount and arrange, the rotating speed of the output shafts 151 is smaller than that of the driving shaft 124, the effect of transmitting low rotating speed and large torque can be realized, and the two speed change mechanisms can be connected in series into a transmission mechanism needing to be output from two ends.

More specifically, the hydraulic motor 100 may function as an actuator for automatic steering. The steering column 200 further includes an upper column 201 and a lower column 202 that are separated from each other, and the hydraulic motor 100 may be connected in series between the upper column 201 and the lower column 202. The upper tubular string 201 may be connected to one of the two output shafts 151 and the lower tubular string 202 may be connected to the other of the two output shafts 151.

As shown in connection with fig. 6, an upper tubular string 201 and a lower tubular string 202 may be respectively located at opposite ends of the driveshaft 124 (housing 110) in the axial direction of the driveshaft 124. The axial direction of the upper column 201 may be substantially parallel to the axial direction of the driveshaft 124, the bottom end of the upper column 201 in the axial direction being connected to one of the two output shafts 151, and the top end of the upper column 201 in the axial direction being for connection to the steering wheel 203. The axial direction of the lower tubular string 202 may be substantially parallel to the axial direction of the drive shaft 124, the top end of the lower tubular string 202 in the axial direction being connected to the other of the two output shafts 151, and the bottom end of the lower tubular string 202 in the axial direction being connected to the wheels.

As described above for the rotation of the output shaft 151, the driving gear drives the driving shaft 124 to rotate, the driving shaft 124 drives the sun gear 142 to rotate, the sun gear 142 drives the planet gears 143 to rotate in the internal gear 141, and finally the output shaft 151 is driven to rotate. Meanwhile, because the sun gear 142 and the planet gear 143 are driven by a gear pair and have a certain reduction ratio, the rotation speed of the output shaft 151 is less than that of the driving shaft 124.

Further, since the two speed change mechanisms 140 and the two output shafts 151 are located at opposite ends of the driving shaft 124 in the axial direction of the driving shaft 124 and are symmetrically arranged, the rotation directions of the two output shafts 151 are the same to ensure the synchronous rotation of the upper tubular column 201 and the lower tubular column 202, thereby ensuring the rotation direction of the steering wheel 203 to be consistent with the rotation direction of the wheels.

Liquid can enter the hydraulic motor 100 to drive the two output shafts 151 to rotate, and the two output shafts 151 drive the upper tubular column 201 and the lower tubular column 202 to rotate, so that the steering function of wheels and a steering wheel 203 is realized. As described above, the oil reservoir may supply hydraulic oil to the driving cavity 114 through the first oil passage 131 and the second oil passage 134, respectively, and the hydraulic motor 100 has a bidirectional rotation function, and the hydraulic oil may cause the output shaft 151 to rotate in different directions through the inlets of the different oil passages, thereby achieving different steering of the wheels and the steering wheel 203, and thus achieving unmanned steering.

Of course, the oil reservoir may also not supply hydraulic oil to the hydraulic motor 100, and since the two output shafts 151 are connected to each other by a plurality of gears and shafts inside the housing 110, the rotation directions of the two output shafts 151 are the same. Therefore, the steering wheel 203 can control one of the two output shafts 151 to rotate, so that the other of the two output shafts 151 can synchronously rotate along with the rotation, thereby driving the wheels to rotate and realizing the steering of the driver.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "part," "member," and the like, when used herein, can refer to either a single part or a combination of parts. Terms such as "mounted," "disposed," and the like, as used herein, may refer to one component as being directly attached to another component or one component as being attached to another component through intervening components. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A hydraulic motor, comprising:

the two speed change mechanisms are arranged in the two speed change cavities respectively;

the two output shafts extend out of the shell, are respectively connected with the two speed change mechanisms, and have the same rotating direction.

2. The hydraulic motor of claim 1, wherein the two oil passages comprise a first oil passage and a second oil passage, the first oil passage comprises a first outlet, the second oil passage comprises a second outlet, and the first outlet and the second outlet are respectively located at opposite ends of the driving cavity and both correspond to the two driving gears at a position where the two driving gears are meshed with each other.

3. The hydraulic motor of claim 2, wherein the first oil passage further comprises a first inlet, the second oil passage further comprises a second inlet, and the first inlet and the second inlet are both disposed on an outer surface of the housing and arranged side-by-side.

4. The hydraulic motor of claim 1, further comprising two oil passages, wherein the two oil passages are both in fluid communication with the same one of the two oil passages, and wherein outlets of the two oil passages are respectively disposed on the walls of the two speed change cavities.

5. The hydraulic motor as claimed in claim 4, wherein a damping structure is provided in the oil passage to reduce the pressure of the liquid.

6. The hydraulic motor of claim 1, wherein the driving cavity communicates with the shift cavity via a through hole through which the driving shaft extends, and a seal is provided along a circumferential direction of the through hole.

7. The hydraulic motor of claim 1, wherein the speed change mechanism comprises:

the inner gear ring is arranged on the cavity wall of the speed change cavity;

8. A steering column, characterized in that it comprises a hydraulic motor according to any one of claims 1-7.

9. The steering column of claim 8, further comprising an upper column connected to one of the two output shafts and a lower column connected to the other of the two output shafts.