KR20170061272A - Apparatus for cotrolling differential lock system - Google Patents

Apparatus for cotrolling differential lock system Download PDF

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Publication number
KR20170061272A
KR20170061272A KR1020150166038A KR20150166038A KR20170061272A KR 20170061272 A KR20170061272 A KR 20170061272A KR 1020150166038 A KR1020150166038 A KR 1020150166038A KR 20150166038 A KR20150166038 A KR 20150166038A KR 20170061272 A KR20170061272 A KR 20170061272A
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KR
South Korea
Prior art keywords
lever
force
wire
dog sleeve
differential
Prior art date
Application number
KR1020150166038A
Other languages
Korean (ko)
Inventor
이동현
권익현
문철우
박지현
이상엽
이재연
조장희
최우성
하유신
유장영
Original Assignee
경북대학교 산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 경북대학교 산학협력단 filed Critical 경북대학교 산학협력단
Priority to KR1020150166038A priority Critical patent/KR20170061272A/en
Publication of KR20170061272A publication Critical patent/KR20170061272A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
    • B60K23/04—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for differential gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/16—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/16—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing
    • B60K17/20—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing in which the differential movement is limited
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/20—Arrangements for suppressing or influencing the differential action, e.g. locking devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
    • B60K23/04—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for differential gearing
    • B60K2023/046—Axle differential locking means

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Retarders (AREA)

Abstract

The present invention provides a lever device.
More specifically, the lever handle is protruded to an upper portion of a lever casing having a guide groove formed at its center, and the lever handle is moved forward and backward to select a locked state of the differential lock dog sleeve according to the driving condition according to the position of the lever handle A control device for a differential gear lock device, comprising: a lever handle which receives a front and rear engaging force of a driver and is coupled to the lever casing and a first joint pin; A lever coupled to the lever handle and the second joint pin to receive the attracting force; a wire coupled to the clevis by the wire pin to receive the attracting force; And a dog sleeve fork that receives a work force, converts the work force into a rotational force, and transmits the rotational force to the differential lock dog sleeve to control a locked state of the differential lock dog sleeve. do.

Description

[0001] APPARATUS FOR COTROLLING DIFFERENTIAL LOCK SYSTEM [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control apparatus for a differential gear lock apparatus, and more particularly, to a control apparatus for a differential gear lock apparatus, which can determine a locked state of a differential gear lock apparatus by transmitting a work force received from a user to a differential gear lock apparatus .

Tiller cultivator is a necessity equipment which is used for farming and multipurpose by purchasing almost one every farmhouse. It is expected that it will be widely used in the future because it is cheap and durable and has little trouble.

Generally, a tilling machine is a two-wheeled agricultural machine, and has a steering clutch that controls the attraction force of the engine to be transmitted directly to both wheels so as to control the attraction force transmitted to both wheels through the steering clutch. Lt; / RTI > According to this configuration, when the cultivator is steered in the flat ground, the clutch in the direction to be steered is operated to cut off the attractive force, so that the steering wheel can be steered without turning the wheels.

On the other hand, unlike general vehicles, cultivators often need to run on uneven roads with narrow farming or bending for agricultural work. In addition, there is a special way to turn the steering clutch lever in reverse direction It is a very dangerous equipment that can cause serious accidents because it is difficult and inconvenient to operate differently depending on the mechanism, that is, the operating environment of the cultivator.

The reason why the conventional cultivator is in danger is the problem of the unusual manpower transmission method. To solve this problem, a safety steering device for intuitively changing direction has been developed. The developed safety steering system is designed to be compatible with the conventional tiller steering system and it can be changed regardless of conditions when operating the steering clutch of tiller in the direction to move. In this case, when the safety steering device is to be operated in a straight line, the differential gear lock device is operated. However, the existing dog clutch lever for controlling the differential gear lock device is not manufactured efficiently, do.

Korean Patent Publication No. 2003-0087091

One aspect of the present invention is to operate the differential gear lock device using the control device of the differential gear lock device and to change the locked state of the differential gear lock device only by operating the lever to the front and rear sides, And a control device of a differential gear lock device which enables the tiller to operate.

The control device of the differential gear lock apparatus according to the embodiment of the present invention is characterized in that the lever handle is protruded to an upper portion of a lever casing having a guide groove formed at the center thereof to move the lever handle forward and backward, A control device of a differential gear lock device for selecting a locked state of a differential lock dog sleeve satisfying a condition, comprising: a lever handle which receives front and rear engaging forces of a driver and is bound to the lever casing and a first joint pin; A lever coupled to the lever handle and the second joint pin to receive the attracting force; a wire coupled to the clevis by the wire pin to receive the attracting force; And a dog sleeve fork that receives the force, converts the force to rotational force, and transmits the rotational force to the differential lock dog sleeve to control the locked state of the differential lock dog sleeve.

Wherein the dog sleeve fork comprises a force transducing member for converting the attraction force into a rotational force, a connecting rod for transmitting the rotational force by being coupled with one end of the force converting member, And a fixing unit for determining the locked state of the differential lock dog sleeve according to the rotational force.

The locking state of the differential lock dog sleeve according to the rotational force is determined by the fact that the fixed portion rotates around the center of the link and the end of the fixed portion contacting the differential lock dog sleeve as the fixed portion rotates And pushing the differential lock dog sleeve.

The fixing portion may have a diagonal shape, and both ends of the diagonals may be bent inward, and the side surface of the end may be bent so as not to be caught by the rotation.

According to one aspect of the present invention described above, it is possible to conveniently control the locking state of the differential locking device by merely moving the lever in the forward and backward directions, and to impart the characteristic so that the position of the lever can be fixed, So that it is possible to improve the convenience of the operation and the travel.

1 is a perspective view showing a control apparatus of a differential gear lock apparatus according to an embodiment of the present invention.
Fig. 2 is a perspective view showing the lever shown in Fig. 1. Fig.
3 is a side view showing the side of the lever shown in Fig.
Fig. 4 is a front view showing a front face of the lever shown in Fig. 2; Fig.
Fig. 5 is a view showing the wire shown in Fig. 1. Fig.
FIG. 6 is a side view showing a side view of the dog sleeve fork shown in FIG. 1; FIG.
FIG. 7 is a perspective view showing the force conversion member of the dog sleeve fork shown in FIG. 6;
8 is a schematic view showing a method of operating the attraction force converting member shown in Fig.
FIG. 9 is a schematic view showing an operation in which the control device of the differential gear lock device according to the embodiment of the present invention controls the differential gear lock device. FIG.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views. Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

1 is a perspective view illustrating a control apparatus for a differential gear lock apparatus according to an embodiment of the present invention,

1, the control device of the differential gear lock device may include a lever 10, a wire 20, and a dog sleeve fork 30. As shown in Fig.

First, the lever 10 can be formed on a side surface of the steering wheel knob so that the driver can easily operate the lever. The lever 10, which is generated by the driver to determine the locked state of the differential gear lock 40, . The lever handle 11 can be moved forward or backward with respect to the driver and sets the differential gear lock 40 in the locked state when moving forward and unlocks the differential gear lock 40 when moving backward, State. The lever (10) can transmit the transferred workforce to the wire (20).

The wire 20 may be formed such that one side of the wire 20 is connected to the lever 10 and the other side of the wire 20 is connected to the dog sleeve fork 30. The wire 20 can receive the force from the lever 10 and can transfer the force transferred from the lever 10 to the dog sleeve fork 30.

The dog sleeve fork 30 may be connected to the wire 20 to receive the force from the wire 20, and may convert the transmitted force into rotational force. The dog sleeve fork 30 uses the converted rotational force to move the differential lock dog sleeve 41 of the differential gear lock 40 away from the differential gear lock 40, Can be released.

FIG. 2 is a perspective view showing the lever shown in FIG. 1, FIG. 3 is a side view showing the side of the lever shown in FIG. 2, and FIG. 4 is a front view showing the front side of the lever shown in FIG.

2, the lever 10 includes a lever handle 11, a lever casing 12, a clevis 13, a first joint pin 14, a wire pin 15, a second joint pin 16, And a first wire fixing bolt (17).

The lever handle 11 can receive the work force transmitted by the driver. The lever handle 11 can be transmitted to the differential gear lock device 40 through the front and rear to determine the locked state of the differential gear lock device 40. In this case, the forward and backward directions may be forward and backward directions on the basis of the driver, and the driver may manipulate the lever handle 11 in all directions to lock the differential gear lock device 40, It can be operated in the backward direction to release it.

The lever handle 11 may be formed to pass through a guide groove formed at the center of the upper portion of the lever casing 12 and may be fixed using the side surface of the lever casing 12 and the first joint pin 14. [ At this time, a hole may be formed in the lower portion of the lever handle 11 and the side surface of the lever casing 12, and the first joint pin 14 penetrates through the formed hole, and the lever handle 11 and the lever casing 12, And the guide groove may be in the form of a seven character including a ring structure.

Meanwhile, the lever handle 11 can move in the forward and backward directions according to the shape of the guide groove, and the movement at this time is the same as the position of the lever handle shown in FIG. More specifically, the state 11 'of FIG. 3 is the position of the lever handle 11 when the differential gear lock 40 is in the locked state, and the states 11 and 11 "are the positions when the differential gear lock 40 is in the unlocked state The position of the lever handle 11 in FIG. At this time, the state 11 '' may be fixed to the annular structure formed in the guide groove so as not to return the lever handle 11 to the state 11 'in order to maintain the unlocked state.

The lever casing 12 may be formed in a square pillar shape so as to protect the components of the lever 10. The center of the upper portion of the lever casing 12 may be a guide groove through which the lever handle 11 can pass . At this time, the guide grooves may be formed in various shapes.

The clevis 13 can be engaged with the lever handle 11 by allowing the second joint pin 16 to pass through the hole formed at the end of the clevis 13 and the lever handle 11. The clevis 13 can be moved in position as the lever handle 11 moves and can receive the attraction force from the lever handle 11 during the movement. More specifically, when the lever handle 11 of FIG. 3 moves from the 11 'state to the 11 state, the clevis 13 moves from the 13' state to the 13 state.

The clevis 13 can engage with the wire 20 and can transfer the attraction force transmitted from the lever handle 11 to the wire 20. [ At this time, the coupling of the clevis 13 with the wire 20 may be a coupling using the wire pin 15. [ More specifically, the wire pin 15 is formed with a hole through which the wire 20 can pass, and the wire 20 is formed. And can penetrate the wire pin 15 through the hole. The wire 20 penetrating the hole can be fixed so as not to fall out of the hole of the wire pin 15 through the knot of the wire 20 itself, the beads formed at the end of the wire 20, or various fixing devices. The wire 20 and the fixed wire pin 15 may be fixed so as to penetrate through the hole formed at the end of the opposite clevis 13 which is not engaged with the lever handle 11. [ At this time, the wire pin 15 may be fixed to the core 21.

 The clevis 13 according to the embodiment of the present invention forms the clevis 13 by using the wire pin 15. However, the clevis 13 is not fixed to this shape but may be a clevis 13 of various shapes such as a U- ), And the clevis 13 at this time can penetrate through the wire 20 at the bottom.

The first wire fixing bolt 17 may be formed on one side of the lever casing 12 and the wire 20 coupled with the clevis 13 may be inserted into the lever casing 12, (Not shown). The first wire fixing bolt 17 can be engaged with the fixing nut 22 of the wire 20 to fix the position of the wire. The fixing nut 22 is included in the wire 20 and will be described later.

Fig. 5 is a view showing the wire shown in Fig. 1. Fig.

5, one end of the wire 20 is connected to the clevis 13 so that the wire 20 can receive the attraction force from the clevis 13, and the transferred attraction force is transmitted to the other side of the wire 20 To the connected dog sleeve fork 30. At this time, the wire 20 may include a wick 21, a fixing nut 22, a wire cover 23, and a rod 24.

The core 21 may be formed by a plurality of strands formed by twisting thin wires, and both ends of the core may be joined with the clevis 13 or a rod 24 may be formed. The wick 21 is connected to the clevis 13 of the lever 10 and the second wire fixing bolts 34 of the dog sleeve fork 30 so that the force transmitted from the lever 10 is transmitted to the dog sleeve fork 30 ).

The fixing nut 22 and the wire cover 23 may be formed so as to surround the wick 21. At this time, the fixing nut 22 and the wire cover 23 are formed so as not to be fixed to the wick 21, and the lubricant can be sprayed so as not to interfere with the movement of the wick 21.

The fixing nut 22 is formed at the end of the wire cover 23 in the direction of connection with the clevis 13 and the wick 21 joined with the first wire fixing bolt 17 and joined with the clevis 13 It can help to reliably deliver the workforce.

The wire cover 23 is made of a material such as reinforced rubber or plastic and is formed so as to surround the outside of the wick 21 to prevent the wick 21 from being damaged, And may be spaced apart from the wick 21.

The rod 24 may be formed at one end of the wick 21. At this time, the rod 24 is threaded and can be coupled to the second wire fixing bolt 34 of the dog sleeve fork 30.

Fig. 6 is a side view showing a side surface of the dog sleeve fork shown in Fig. 1, and Fig. 7 is a perspective view showing a force transducer member of the dog sleeve fork shown in Fig.

Referring to FIGS. 6 and 7, the dog sleeve fork 30 may be connected to the wire 20 and may be configured to mate with the differential gear lock 40. The dog sleeve fork 30 can receive the force from the wire 20, convert the transmitted force to rotational force, and control the locked state of the differential gear lock device 40 using the converted rotational force. The dog sleeve fork 30 may include a force conversion member 31, a linkage 32, and a fixing portion 33.

The attraction force conversion member 31 may convert the attraction force transmitted from the wire 20 into a rotational force and transmit the rotational force to the connection point 32. [ The force conversion member 31 may be made of metal to receive attraction force and rotational force, and may be rod-shaped. In this case, the force conversion member 31 may be formed into various shapes such as a curved shape or a step shape depending on the situation, and the force conversion member 31 may be formed of a wire (for example, 20). The attraction force conversion member 31 formed in such a shifted direction moves from the 31 'state to the 31 state when the attraction force is transmitted from the wire 20 and the rotation force generated by the movement of the attraction force conversion member 31 is transmitted to the connection base 32 .

A second wire fixing bolt 34 for coupling with the rod 24 may be formed at one side of the attraction force changing member 31 and a hole may be formed at the other side for engaging with the connecting rod 32 . At this time, the formed holes may be formed with protruding grooves so that the attraction force converting member 31 and the linkage 32 rotate equally. The formed protruding grooves are engaged with the grooves of the connecting rod (32).

The connecting rod 32 can receive the rotational force from the force converting member 31 and can transmit the transmitted rotational force to the fixing unit 33. [ The connecting rod 32 receives the rotational force from the force converting member 31 when the force converting member 31 moves. At this time, the connecting rod 32 may rotate about the center axis of the connecting rod.

The connecting rod 32 may be formed of a metal material to receive rotational force, and may be in the form of a rod. One end of the linkage 32 coupled with the force conversion member 31 may be formed with a groove so as to rotate in the same manner as the force conversion member 31, Lt; / RTI > And the other end of the linkage 32 can be engaged with the fixing part 33. [

The fixing portion 33 can receive the rotational force from the connecting rod 32 and can release the locking state of the differential gear lock 40 by using the transmitted rotational force. At this time, releasing the lock state of the differential gear lock device 40 may be that the differential lock dog sleeve 41 is moved using the torque transmitted from the fixed portion 33. [ This will be described in more detail with reference to Fig.

9, the differential gear lock device 40 includes a differential lock dog sleeve 41 and a differential lock spring 43. In the locked state A, the differential lock dog sleeve 41 is engaged with the differential gear lock 41, The differential lock dog sleeve 41 is engaged with the differential gear lock 40 in the unlocked state B. In the locked state A, the lever 11 is in the state 11 'of FIG. 3, so that no attractive force is generated and no rotational force is converted on the basis of the attractive force, It is not delivered. At this time, the differential lock spring 43 in contact with the differential lock dog sleeve 41 applies an elastic force to the differential lock dog sleeve 41, and the differential lock dog sleeve 41 is subjected to the differential force Is coupled to the gear lock (40).

In the case of the unlocked state (B), when the lever knob 11 is in the 11 state or the 11 " state of Fig. 3 and the attraction force is generated and the attraction force conversion member 31 And the converted rotational force is transmitted to the fixing portion 33 through the linking portion 32. [0031] The rotational force at this time is larger than the elastic force of the differential lock spring 43. [ Thereby, the differential lock dog sleeve 41 is separated from the differential gear lock device 40 in accordance with the rotation based on the rotational force of the fixed portion 33. [

In order to transmit the transmitted rotational force to the differential lock dog sleeve 41 without waste, the fixing portion 33 may be formed in a diagonally curved shape inward of both ends. When the fixing portion 33 rotates, The side surface of the end portion may be curved so as not to be caught by the lock dog sleeve 41. [ The ends thus formed can be fixedly joined to the U-shaped groove formed in the differential lock dog sleeve 41. Although the fixing portion 33 of the present invention is formed in a diagonal shape, it may be formed in various shapes such as a U shape, a forceps type, and the like.

10: Lever
20: Wire
30: dog sleeve fork

Claims (4)

A lever handle is protruded to an upper portion of a lever casing having a guide groove formed at its center, and the lever handle is moved forward and backward to select a differential lock gear sleeve locking state corresponding to a driving condition according to a position of the lever handle A control device of a device,
A lever handle which receives the front and rear pulling forces of the driver and is coupled to the lever casing and the first joint pin; And a lever coupled to the lever handle and the second joint pin to receive the attraction force;
A wire which is connected to the clevis by a wire pin and receives the attraction force;
And a dog sleeve fork that is coupled to the other side of the wire to receive the attraction force, converts the attraction force into rotational force, and transmits the rotational force to the differential lock dog sleeve to control the locked state of the differential lock dog sleeve. Control device for gear lock. The method according to claim 1,
The dog sleeve fork comprises:
A force transducing member for converting the attraction force into a rotational force, a connecting rod which is engaged with one end of the force converting member and transmits the rotational force, and a connecting rod which is formed on the other side of the connecting rod, A control device for a differential gear lock device comprising a fixing part for determining a locked state of a dog sleeve. 3. The method of claim 2,
Determining the locked state of the differential lock dog sleeve according to the rotational force,
Wherein the fixing portion rotates about the center of the linkage and the end of the fixing portion contacting the differential lock dog sleeve pushes the differential lock dog sleeve as the fixing portion rotates. The method of claim 3,
The fixing unit includes:
Wherein the differential gear is formed so that both ends of the differential gear are bent inward and the side surface of the differential gear is bent so as not to be caught by the rotation.
KR1020150166038A 2015-11-26 2015-11-26 Apparatus for cotrolling differential lock system KR20170061272A (en)

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KR1020150166038A KR20170061272A (en) 2015-11-26 2015-11-26 Apparatus for cotrolling differential lock system

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Application Number Priority Date Filing Date Title
KR1020150166038A KR20170061272A (en) 2015-11-26 2015-11-26 Apparatus for cotrolling differential lock system

Publications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11667190B2 (en) * 2020-03-10 2023-06-06 Kubota Corporation Work vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11667190B2 (en) * 2020-03-10 2023-06-06 Kubota Corporation Work vehicle

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