Agricultural tractor

Abstract

The present invention relates to a suspension device capable of protecting a driver from external force applied in various directions. The present invention provides an agricultural tractor having the suspension device comprising a first stopper which protrudes to a certain height from a support bracket, and is provided with a vibration-proof member on the upper end portion thereof facing a cabin, wherein the first stopper includes the vibration-proof member disposed at the lower end of the cabin and installed to be spaced apart from the cabin. According to the present invention, driver's safety can be effectively secured in various operating situations.

Description

agricultural tractor

[0001] The present invention relates to an agricultural tractor, and more specifically, to a suspension device for supporting the cabin of an agricultural tractor.

[0002] Agricultural tractors can perform various types of agricultural work by attaching and detaching various implements. Implements include rotary tillers, plows, harrows, loaders, and backhoes.

[0003] Agricultural tractors with a certain horsepower or more have a cabin.

[0004] The cabin forms the driver's passenger space and isolates the passenger space from the external environment.

[0005] Agricultural tractors operate not only on paved roads but also in environments with uneven road surfaces, such as slopes, mud, and rice paddies.

[0006] Operating on uneven road surfaces at the work site causes the agricultural tractor to shake in various directions, generating vibrations and shocks.

[0007] Vibrations and shocks generated by the operation of an agricultural tractor can be transmitted directly to the driver in the passenger compartment inside the cabin.

[0008] If vibrations and shocks are transmitted directly to the driver, not only is the driver's ride comfort reduced, but fatigue may also accumulate in the driver's body due to repeatedly applied vibrations and shocks. If a continuous burden is placed on the driver's body, safety issues may arise due to decreased concentration.

[0009] Conventionally, a mounting device was interposed between the vehicle body and the cabin of an agricultural tractor to reduce vibrations and shocks transmitted to the driver.

[0010] In the case of mounting devices, most were implemented by interposing rubber anti-vibration mounts between the cabin and the vehicle body.

[0011] However, as agricultural tractor models become larger, the weight of not only the vehicle body but also the implements becomes substantial, causing the shock load that rubber anti-vibration mounts must withstand during operation to increase excessively. It was difficult to sufficiently reduce the vibration and shock transmitted to the operator using mounting devices alone.

[0012] Recently, the distribution of high-quality agricultural tractors has become commonplace to satisfy customer needs, and as part of this effort to improve the quality of agricultural tractors, attempts are being made to apply suspension systems that offer superior vibration and shock reduction performance compared to mounting devices.

[0013] FIG. 1 is a reference diagram illustrating a suspension system applied to a conventional agricultural tractor.

[0014] Referring to FIG. 1, the suspension device (SD) applied to a conventional agricultural tractor (T) includes a shock absorber (D).

[0015] The buffer (D) includes a spring (S) and a shock absorber (SA).

[0016] The spring (S) wraps around the outside of the shock absorber (SA) and is coupled to cushion the shock applied from the outside.

[0017] The shock absorber (SA) dampens the vibration of the spring (S) that absorbs the shock applied from the outside.

[0018] Since agricultural tractors (T) mostly perform work on work sites with irregular road surface conditions, the external forces generated during this process are not limited to the vertical direction of the agricultural tractor but also act in various ways in the front-rear and left-right directions.

[0019] In the case of the suspension device (SD), since the shock absorber (D) is designed to respond to vertical loads, it is inevitably vulnerable to external forces applied in combination from other directions.

[0020] Of course, under normal driving and working conditions, external forces within the design range act on the conventional suspension device (10), so there is no difficulty in reducing shock and vibration transmitted to the driver.

[0021] However, due to the structure of the suspension device (SD), excessive external force is repeatedly applied to a single shock absorber (D) in situations such as when the road surface of the work site is very uneven or when the agricultural tractor (T) overturns. In other words, not only is a significant load applied in the vertical direction to the shock absorber (D) of the suspension device (SD), but external forces are also applied from various directions. In this case, the possibility that the shock absorber (D) may detach from the mounting point or be damaged cannot be ruled out.

[0022] Considering the limitations of such conventional suspension devices (SD), the structure needs to be improved so that the safety of the driver can be more reliably guaranteed in various operating situations as well as in general driving and working conditions of the agricultural tractor (T).

[0023] [Prior Art Literature]

[0024] [Patent Literature]

[0025] (Patent Document 1) Korean Published Patent Application No. 10-2015-0046080

[0026] (Patent Document 2) Japanese Published Patent Application No. 11-268664

[0027] The present invention was conceived from consideration of a structure capable of protecting the driver from external forces acting from various directions.

[0028] To achieve this purpose, an agricultural tractor (10) according to one embodiment of the present invention comprises: a cabin (200) providing a passenger space for a driver; a vehicle body (300) supporting the cabin (200) and supporting driving on a work site or working with a work implement on a work site; and a suspension device (100) installed between the cabin (200) and the vehicle body (300) to support the cabin (200) and dampen vibrations transmitted from the vehicle body (300); wherein the suspension device (100) comprises: a plate-shaped support bracket (110) installed below the cabin (200) and having its lower portion supported by the vehicle body (300); and a shock absorber (120) having its upper portion mounted on the vehicle body (300) and its lower portion mounted on the support bracket (110) to dampen vibrations generated between the vehicle body (300) and the cabin (200). and a first stopper (140) formed to protrude a predetermined height from the support bracket (110), having a vibration damping member (142) provided on the upper portion facing the cabin (200), and positioned adjacent to the buffer (120); wherein the first stopper (140) may be installed spaced apart from the cabin (200), with the vibration damping member (142) positioned at the bottom of the cabin (200).

[0029] The above suspension device (100) includes a support link (130) in which the upper portion is mounted on the cabin (200) and the lower portion is mounted on the support bracket (110) to support the cabin (200) together with the shock absorber (120); the support link (130) includes a fixed arm (131) fixedly installed on the support bracket (110); a movable arm (132) in which one end is connected to the cabin (200) and the other end is connected to the fixed arm; and a hinge portion (133) that hinge-connects the fixed arm (131) and the movable arm (132); and the support link (130) allows the movable arm (132) to rotate and move in the up and down direction relative to the hinge portion (133).

[0030] The suspension device (100) comprises a second stopper (150) for restricting the movement of the support link (130); the second stopper (150) comprises a first side panel (151) installed on the support bracket (110) and positioned adjacent to the support link (130); and a second side panel (152) installed on the support bracket (110) and positioned opposite the first side panel (151) with the support link (130) in between; and the first side panel (151) and the second side panel (152) can restrict the horizontal movement of the movable arm (132).

[0031] The second stopper (150) further includes an upper panel (153) connecting the upper portions of the first side panel (151) and the second side panel (152); and the upper panel (153) is spaced apart from the support bracket (110) by a predetermined height to restrict the upward movement of the movable arm (132).

[0032] The suspension device (100) may further include: a ball storage bar (160) having a long length in a direction perpendicular to the support bracket (110) and a lower portion installed on the support bracket (110); and a detachment prevention pin (160-P) detachably coupled to the upper portion of the ball storage bar (160) to prevent the work ball (WB) inserted into the ball storage bar (160) from detaching.

[0033] The above ball holder bar (160) can be positioned behind the first stopper (140).

[0034] To achieve this purpose, an agricultural tractor (10) according to another embodiment of the present invention comprises: a cabin (200) providing a passenger space for a driver; a vehicle body (300) supporting the cabin (200) and supporting driving on a work site or working with a work implement on a work site; and a suspension device (100) installed between the cabin (200) and the vehicle body (300) to support the cabin (200) and dampen vibrations transmitted from the vehicle body (300); wherein the suspension device (100) comprises a plate-shaped support bracket (110) installed below the cabin (200), the lower portion of which is supported by the vehicle body (300); It may include: a damper (120) installed below the cabin (200), with its upper portion mounted on the cabin (200) and its lower portion mounted on the support bracket (110) to dampen vibrations generated between the vehicle body (300) and the cabin (200); a support link (130) with its upper portion mounted on the cabin (200) and its lower portion mounted on the support bracket (110) to support the cabin (200) together with the damper (120); and a second stopper (150) to restrict the movement of the support link (130).

[0035] The second stopper (150) comprises: a first side panel (151) installed on the support bracket (110) and positioned adjacent to the support link (130); and a second side panel (152) installed on the support bracket (110) and positioned opposite the first side panel (151) with the support link (130) in between, and the second stopper (150) can restrict the horizontal movement of the support link (130).

[0036] The support link (130) comprises: a fixed arm (131) fixedly installed on the support bracket (110); a movable arm (132) with one end connected to the cabin (200) and the other end connected to the fixed arm (131); and a hinge portion (133) that hinge-connects the fixed arm (131) and the movable arm (132); wherein the support link (130) allows the movable arm (132) to rotate in the up and down direction relative to the hinge portion (133); and the second stopper (150) further comprises an upper panel (153) connecting the upper portions of the first side panel (151) and the second side panel (152); wherein the upper panel (153) is spaced apart from the support bracket (110) at a predetermined height to restrict the upward movement of the movable arm (132).

[0037] The suspension device (100) may further include: a ball storage bar (160) having a long length in a direction perpendicular to the support bracket (110) and a lower portion installed on the support bracket (110); and a detachment prevention pin (160-P) detachably coupled to the upper portion of the ball storage bar (160) to prevent the work ball (WB) inserted into the ball storage bar (160) from detaching.

[0038] The above ball holder bar (160) can be positioned behind the second stopper (150).

[0039] The support link (130) comprises: a fixed arm (131) fixedly installed on the support bracket (110); a movable arm (132) having one end connected to the cabin (200) and the other end connected to the fixed arm (131); and a hinge portion (133) that hinge-connects the fixed arm (131) and the movable arm (132); wherein the support link (130) allows the movable arm to rotate in the up and down direction relative to the hinge portion (133); and the second stopper (150) comprises: a first side panel (151) installed on the support bracket (110) and positioned adjacent to the support link (130); and a second side panel (152) installed on the support bracket (110) and positioned opposite the first side panel (151) with the support link (130) in between. and an upper panel (153) connecting the upper portions of the first side panel (151) and the second side panel (152); wherein the upper panel (153) is spaced apart from the support bracket (110) by a predetermined height to restrict the upward movement of the movable arm (132).

[0040] The above suspension device (100) can support the rear part of the cabin (200).

[0041] The above suspension device (100) can be installed on the rear side of the cabin (200).

[0042] As explained above, according to the present invention, the following effects can be derived.

[0043] First, even if the buffer is displaced from its mounting position, the first stopper supports the lower part of the cabin, thereby preventing the cabin from rapidly descending and preventing damage to surrounding parts and workers caused by this.

[0044] Second, the second stopper prevents the support link from detaching while suppressing oscillation in unnecessary directions, thereby minimizing cabin shaking and enabling the support link to stably support the cabin together with the buffer.

[0045] Ultimately, driver safety can be effectively enhanced in various operating situations.

[0046] FIG. 1 is a reference diagram for explaining a suspension system applied to a conventional agricultural tractor.

[0047] FIGS. 2 and 3 are reference drawings for explaining an agricultural tractor according to an embodiment of the present invention.

[0048] FIGS. 4 and 5 are reference drawings for explaining the mounting structure of a suspension device in an agricultural tractor according to one embodiment of the present invention.

[0049] FIG. 6 is an exploded view of the suspension device exemplified in FIG. 5.

[0050] FIG. 7 is a perspective view of the suspension device exemplified in FIG. 5.

[0051] FIG. 8 is a reference diagram for explaining the first stopper in the suspension device exemplified in FIG. 5.

[0052] FIGS. 9 and 10 are reference drawings for explaining the second stopper in the suspension device exemplified in FIG. 5.

[0053] Preferred embodiments according to the present invention are described with reference to the accompanying drawings, provided that for the sake of brevity, descriptions of well-known configurations are omitted or compressed as much as possible.

[0054] <Brief Overview of Agricultural Tractors>

[0055] FIGS. 2 and FIGS. 3 are reference drawings for explaining an agricultural tractor (10) according to one embodiment of the present invention, and FIGS. 4 and FIGS. 5 are reference drawings for explaining the mounting structure of a suspension device (100) in an agricultural tractor (10) according to one embodiment of the present invention.

[0056] Referring to FIGS. 2 to 5, an agricultural tractor (10) according to one embodiment of the present invention includes a cabin (200), a vehicle body (300), and a suspension device (100).

[0057] The cabin (200) forms the passenger compartment for the driver.

[0058] The vehicle body (300) supports the cabin (200) and drives the work site or supports the work equipment on the work site.

[0059] The vehicle body (300) includes a support frame (not shown), a drive source (310), a driving mechanism (320), and a transmission (330), etc.

[0060] The support frame forms the frame of the agricultural tractor (10).

[0061] Components required for the operation of the agricultural tractor (10), such as the drive source (310), the driving mechanism (320), and the transmission (330), can be supported by a support frame.

[0062] The driving source (310) generates power necessary for the agricultural tractor (10) to drive or to perform work by a connected work tool. The driving source (310) may be equipped with an internal combustion engine, but may also be equipped with an electric motor.

[0063] The driving device (320) includes wheels for driving and drives with power generated from the driving source (310).

[0064] The transmission (330) converts power input from the driving source (310) into power required by the driver and transmits it to the driving device (320).

[0065] Vibrations generated from the vehicle body (300), such as vibrations generated from the driving source (310) during operation of the agricultural tractor (10), vibrations generated during the work process, vibrations generated from the transmission (330), and vibrations generated by the road surface condition during driving, can be transmitted to the cabin (200).

[0066] The suspension device (100) is installed between the cabin (200) and the vehicle body (300).

[0067] A number of suspension devices (100) are provided.

[0068] A plurality of suspension devices (100) support at least one of the front and rear of the cabin (200) and dampen vibrations transmitted from the vehicle body (300) to the cabin (200).

[0069] For reference, the load may fluctuate rapidly during the process of attaching or detaching a work implement to the rear of the agricultural tractor (10). When a work implement is attached, vibrations generated by the work implement during operation may also be transmitted to the vehicle body. The rear of the agricultural tractor (10) is more vulnerable to vibrations and shocks during operation compared to the front.

[0070] Accordingly, in the agricultural tractor (10) proposed by the present invention, a conventional mounting device (not shown) is applied to the front part of the cabin (200), and a suspension device (100) is applied only to the rear part. In this case, two mounting devices may be placed on each side of the front part of the cabin (200), and two suspension devices (100) may be placed on each side of the rear part of the cabin (200). It may also be considered that the suspension devices (100) are placed on both sides of the rear part of the cabin (200).

[0071] In addition to being installed on both sides of the rear portion of the cabin (200), the suspension device (100) may also be installed to support any point on the horizontal line connecting both sides of the rear portion of the cabin (200). That is, the application of the suspension device (100) can be considered at any point where it can support the rear portion of the cabin (200).

[0072] However, since this is merely one example, it goes without saying that the application of the suspension device (100) proposed by the present invention to both the front and rear parts of the cabin (200) can be considered depending on the design.

[0073] Hereinafter, the suspension device (100) proposed by the present invention will be described in detail with reference to the drawings.

[0074] <Explanation of the Suspension System>

[0075] FIGS. 4 and 5 are reference drawings for explaining the mounting structure of a suspension device (100) in an agricultural tractor (10) according to an embodiment of the present invention, FIG. 6 is an exploded perspective view of the suspension device (100) illustrated in FIG. 5, FIG. 7 is a perspective view of the suspension device (100) illustrated in FIG. 5, FIG. 8 is a reference drawing for explaining a first stopper in the suspension device (100) illustrated in FIG. 5, and FIGS. 9 and 10 are reference drawings for explaining a second stopper in the suspension device (100) illustrated in FIG. 5.

[0076] Referring to FIGS. 4 to 7, in an agricultural tractor (10) according to one embodiment of the present invention, the suspension device (100) includes a support bracket (110), a shock absorber (120), a support link (130), a first stopper (140), and a second stopper (150).

[0077] The support bracket (110) is provided in the shape of a plate having a predetermined area.

[0078] The support bracket (110) is installed on the vehicle body (300).

[0079] The upper portion of the shock absorber (120) is mounted on the cabin (200) positioned on the upper part of the vehicle body (300), and the lower portion is mounted on the support bracket (110).

[0080] The shock absorber (120) dampens vibrations generated between the vehicle body (300) and the cabin (200).

[0081] The buffer (120) includes a shock absorber (121) and a spring (122).

[0082] The shock absorber (121) is provided as a cylinder that acts as a damper.

[0083] At both ends of the shock absorber (121), fastening parts (121a, 121b) are provided to be connected to the cabin (200) and the vehicle body (300), respectively.

[0084] The support bracket (110) is provided with a fastening member (110-CP) for being connected to a fastening part (121b) provided at the lower part of the shock absorber (121).

[0085] The spring (122) has elastic support and is coupled by wrapping around the outer circumference of the shock absorber (121).

[0086] When vibration occurs from the vehicle body (300), the spring (120) is elastically deformed and absorbs the vibration, and the shock absorber (121) dampens the vibration of the spring (122).

[0087] The buffer (120) is positioned such that the upper and lower portions are offset from each other on the same vertical line, with the upper portion being closer to the cabin (200) side than the lower portion and positioned at an angle. The buffer (120) withstands external forces acting in the vertical direction as well as the horizontal direction and supports the lower portion of the cabin (120).

[0088] The upper part of the support link (130) is mounted to the cabin (200), and the lower part is mounted to the support bracket (110).

[0089] The support link (130) supports the cabin (200) together with the buffer (120).

[0090] The support link (130) includes a fixed arm (131), a movable arm (132), and a hinge part (133).

[0091] The fixed arm (131) is fixedly installed on the support bracket (110).

[0092] One end of the movable arm (132) is connected to the cabin (200), and the other end is connected to the fixed arm (131).

[0093] The moving arm (132) can be rotated and moved in the up and down direction, which is the arrangement direction of the cabin (200) and the support link (130), based on the hinge part (133).

[0094] The hinge portion (133) hinges the fixed arm (131) and the movable arm (132).

[0095] In the support link (130), one end portion of the movable arm (132) is positioned closer to the cabin (200) side than the other end portion and is arranged to rotate and move in the up and down direction. The support link (130), together with the buffer (120), can withstand external forces acting in the left and right directions as well as the up and down direction and support the lower portion of the cabin (120).

[0096] The first stopper (140) includes a support (141) and a vibration damping member (142).

[0097] The support member (141) is formed to protrude a predetermined height from the support bracket (110).

[0098] The anti-vibration member (142) is provided on the upper part of the support (141).

[0099] The vibration damping member (142) may be made of a material capable of absorbing vibrations while supporting the load of the cabin (200). For example, the vibration damping member (142) may be made of rubber, but is not limited thereto.

[0100] The anti-vibration member (142) prevents direct contact between the support (141) made of metal material and the cabin (200), and can effectively absorb vibrations caused by impact when the cabin (200) falls.

[0101] Of course, the shape of the anti-vibration member (142) can be varied by the load of the cabin (200), the arrangement structure of surrounding components, and the spacing at which the support member (141) is spaced from the cabin (200).

[0102] The upper portion of the first stopper (140) is positioned at a predetermined distance from the cabin (200). More specifically, the upper portion of the anti-vibration member (142) is positioned at a predetermined distance from the cabin (200). This is to avoid interfering with the operation of the shock absorber (120) and the support link (130) in a normal driving and working environment.

[0103] The first stopper (140) is configured to support the lower part of the cabin (200) in place of the buffer (120) when the buffer (120) is dislodged from its mounting position due to breakage, damage, etc.

[0104] Of course, when operating an agricultural tractor under normal driving and working conditions, external forces within the design range act on the conventional suspension system, so there is no difficulty in reducing the shock and vibration transmitted to the driver.

[0105] However, in extreme situations—such as when an agricultural tractor overturns—where external forces occur in various unexpected directions, unlike normal driving and working conditions, it is inevitable. In particular, due to the structure of the suspension, agricultural tractors may be vulnerable to vertical crushing and lateral loads.

[0106] It is necessary to consider even vibrations caused by impacts exceeding the designed value in preparation for such extreme situations. Accordingly, the present invention is designed to more reliably ensure the safety of the driver in various operating situations of an agricultural tractor by placing a first stopper (140) adjacent to a buffer (120).

[0107] Below, the function of the first stopper (140) will be explained with further reference to FIG. 8.

[0108] FIG. 8 illustrates a situation in which the connection between the buffer (120) and the cabin (200) of the suspension device (100) is damaged due to excessive external force applied in an extreme situation.

[0109] When the shock absorber (120) of the suspension device (100) positioned on the right side among the suspension devices (100) positioned on each side of the rear of the cabin (200) is displaced from its mounting position, the cabin (200) tilts to the right.

[0110] When the cabin (200) is tilted to the right, the lower part of the cabin (200) and the upper part of the first stopper (140) come into contact and support the cabin (200) in place of the buffer (120).

[0111] The first stopper (140) properly supports the lower part of the cabin (200) that collapses downward, and the left side of the remaining cabin (200) is supported by the installed suspension device (100). That is, the first stopper (140) prevents the cabin (200) from rapidly falling.

[0112] When the cabin (200) is supported by the first stopper (140), the first stopper (140) supports the self-weight of the agricultural tractor (10) and prevents secondary damage to the cabin (200) and surrounding components, as well as ensuring that the driver inside the cabin (200) is also safely protected.

[0113] The second stopper (150) includes a first side panel (151), a second side panel (152), and an upper panel (153). Further reference is made to FIG. 9 regarding the configuration and function of the second stopper (150).

[0114] Referring to FIGS. 4 through 7 and FIG. 9, the first side panel (151) is installed on the upper surface of the support bracket (110) and is positioned adjacent to the support link (130).

[0115] The second side panel (152) is installed on the upper surface of the support bracket (110) and is positioned opposite the first side panel (151) with the support link (130) in between.

[0116] The gap (D) between the first side panel (151) and the second side panel (152) is made larger than the width of the connecting portion connecting one end and the other end of the movable arm (132) so that the movable arm (132) is fitted.

[0117] The gap (D) between the first side panel (151) and the second side panel (152) is made smaller than the width (W) of one end portion of the movable arm (132) so that the movable arm (132) does not easily detach from the second stopper (150).

[0118] The first side panel (151) and the second side panel (152) restrict the horizontal movement of the support link (130). Consequently, the first side panel (151) and the second side panel (152) prevent left-right oscillation of the moving arm (132) and guide its direction of movement so that it can only move up and down.

[0119] Unnecessary shaking of the cabin (200) supported by the support link (130) can be suppressed by the first side panel (151) and the second side panel (152).

[0120] The upper panel (153) connects the upper portions of the first side panel (151) and the second side panel (152).

[0121] The upper panel (153) is spaced apart from the support bracket (110) by a predetermined height to restrict the upward movement of the movable arm (132).

[0122] As the upper movement of the moving arm (132) is restricted by the upper panel (153), the support link (130) operates, and the distance between the support bracket (110) and the cabin (200) can be prevented from becoming excessively far apart.

[0123] If the moving arm (132) moves excessively upward, a height difference occurs between the point supported by the buffer (120) and the point supported by the moving arm (132) in the cabin (200), and tilting of the cabin (200) may be induced.

[0124] If the moving arm (132) and the buffer (120) move differently than intended, a load is placed on one of the components, and problems such as damage or breakage of the component may occur due to the eccentric load.

[0125] Since the range of movement of the movable arm (132) is maintained constant by the upper panel (153), the predictability of the movement of the suspension device (100) during actual driving can be ensured. When the movement of the suspension device (100) is predicted, the design of surrounding parts of the suspension device (100) can be optimized by referring to this when designing other parts of the agricultural tractor (10).

[0126] As the upward movement of the moving arm (132) is restricted by the upper panel (153), the recoil phenomenon of the cabin (200) rapidly rising and falling can be suppressed. As the recoil phenomenon is suppressed, the safety of the driver is ensured, and at the same time, the possibility of damage or breakage of the support link (130) can be minimized.

[0127] The position of the upper panel (153) can be positioned higher than the upper portion of the first stopper (140). Since the position of the upper panel (153) limits the distance the moving arm (132) can move upward, it is obvious that it can be applied variably depending on the gap between the cabin (200) and the installation area where the support bracket (110) is installed in the vehicle body (300).

[0128] The first side panel (151), the second side panel (152), and the top panel (153) can be formed integrally.

[0129] Another variation of the second stopper (150) is illustrated in FIG. 10.

[0130] As illustrated in FIG. 10, the second stopper (150) may include only the first side panel (151) and the second side panel (152). In this case, as previously mentioned, the first side panel (151) and the second side panel (152) can guide the movement of the movable arm (132) while preventing left-right oscillation of the support link (130).

[0131] However, for the application of the second stopper (150) of the structure exemplified in FIG. 10 to be considered, there is a need to devise other measures to restrict the upward movement of the moving arm (132) in the support link (130).

[0132] For example, the hinge portion (133) of the support link (130) can be considered as a hinge member with a fixed maximum rotation angle.

[0133] If the rotation angle of the movable arm (132) is limited through a design change of the hinge part (133), there is no need to limit the upward movement of the movable arm (132) using a separate structure such as the upper panel (153).

[0134] The second stopper (150) of the various examples above can contribute to improving ride comfort together with the shock absorber (120) by not only preventing the support link (130) from coming off but also suppressing oscillation in unnecessary directions.

[0135] Meanwhile, the suspension device (100) proposed by the present invention may further be equipped with a ball bearing bar (160).

[0136] The ball housing bar (160) is installed at its lower portion on the support bracket (110) and is provided in a bar shape having a long length in a direction perpendicular to the support bracket (110).

[0137] A detachment prevention pin (160-P) is detachably connected to the upper portion of the ball holder bar (160) to prevent the work ball (WB, shown in FIG. 7) inserted into the ball holder bar (160) from detaching.

[0138] The anti-detachment pin (160-P) can be provided as a linch pin.

[0139] The ball bearing bar (160) is mounted on a single support bracket (110) provided in the suspension device (100) and positioned at the lower part of the cabin (200), and is located adjacent to a connecting link (not shown) installed at the rear part of the vehicle body (300).

[0140] In the case of the work device, it is mounted on the aforementioned connecting link, and as the ball bearing bar (160) is provided on the support bracket (110) of the suspension device (100), it can be positioned adjacent to the connection point of the work device.

[0141] The work ball (WB) is a component required when mounting a work on a connecting link, and since the work ball (WB) is inserted into the ball storage bar (160) and stored at all times, the worker does not have to carry the work ball (WB), and the delay in mounting the work due to the absence of the work ball (WB) can be prevented in advance.

[0142] As the work ball (WB) is positioned adjacent to the connection point of the work, if the work ball (WB) is required during the mounting of the work, the connection between the work and the connection link can be performed without the operator leaving that position.

[0143] However, if the suspension device (100) proposed by the present invention is applied to the front of the cabin (200), the ball bearing bar (160) and the anti-detachment pin (160-P) may be omitted.

[0144] For reference, the suspension device (100) proposed by the present invention is provided as a single assembly in which all components are placed in appropriate locations on a single support bracket (110), so assembly and replacement may be easy.

[0145] The embodiments described above are merely preferred examples of the present invention and may have various applications. Therefore, the present invention should not be understood as being limited only to the contents described above. Instead, the scope of the present invention should be understood as the separately described claims and their equivalents.

Claims

1. A cabin (200) providing a passenger space for the driver; A vehicle body (300) that supports the above-mentioned cabin (200) and drives to a work site or supports the operation of a work machine on a work site; and A suspension device (100) installed between the cabin (200) and the vehicle body (300) to support the cabin (200) and dampen vibrations transmitted from the vehicle body (300); comprising The above suspension device (100) is, A plate-shaped support bracket (110) installed below the cabin (200), with its lower portion supported by the vehicle body (300); A damper (120) having an upper portion mounted on the vehicle body (300) and a lower portion mounted on the support bracket (110) to dampen vibrations generated between the vehicle body (300) and the cabin (200); and A first stopper (140) is formed to protrude a predetermined height from the support bracket (110), has a vibration damping member (142) provided on the upper portion facing the cabin (200), and is positioned adjacent to the buffer (120); The first stopper (140) is such that the anti-vibration member (142) is positioned at the bottom of the cabin (200) and installed spaced apart from the cabin (200). Agricultural tractor (10).

2. In Paragraph 1, The above suspension device (100) is, A support link (130) having an upper portion mounted on the cabin (200) and a lower portion mounted on the support bracket (110) to support the cabin (200) together with the buffer (120); The above support link (130) is, A fixed arm (131) fixedly installed on the above support bracket (110); A movable arm (132) having one end connected to the cabin (200) and the other end connected to the fixed arm; and A hinge portion (133) that hinge-connects the fixed arm (131) and the movable arm (132); comprising, The support link (130) is such that the movable arm (132) rotates up and down with respect to the hinge part (133). Agricultural tractor (10).

3. In Paragraph 2, The above suspension device (100) is, A second stopper (150) for restricting the movement of the support link (130); comprising, The above second stopper (150) is, A first side panel (151) installed on the support bracket (110) and positioned adjacent to the support link (130); and A second side panel (152) installed on the support bracket (110) and positioned opposite the first side panel (151) with the support link (130) in between; comprising The first side panel (151) and the second side panel (152) restrict the horizontal movement of the movable arm (132). Agricultural tractor (10).

4. In Paragraph 3, The above second stopper (150) is, It further includes an upper panel (153) connecting the upper portions of the first side panel (151) and the second side panel (152); The upper panel (153) is spaced apart from the support bracket (110) by a predetermined height to restrict the upward movement of the movable arm (132). Agricultural tractor (10).

5. In Paragraph 1, The above suspension device (100) is, A ball-shaped bar (160) having a lower portion installed on the support bracket (110) and having a long length in a direction perpendicular to the support bracket (110); and A detachment prevention pin (160-P) that is detachably coupled to the upper portion of the ball storage bar (160) to prevent the work tool ball (WB) inserted into the ball storage bar (160) from detaching; further comprising Agricultural tractor (10).

6. In Paragraph 5, The above ball bearing bar (160) is positioned further back than the first stopper (140). Agricultural tractor (10).

7. A cabin (200) providing a passenger space for the driver; A vehicle body (300) that supports the above-mentioned cabin (200) and drives to a work site or supports the operation of a work machine on a work site; and A suspension device (100) installed between the cabin (200) and the vehicle body (300) to support the cabin (200) and dampen vibrations transmitted from the vehicle body (300); comprising The above suspension device (100) is, A plate-shaped support bracket (110) installed below the cabin (200), with its lower portion supported by the vehicle body (300); A damper (120) installed below the cabin (200), with its upper portion mounted on the cabin (200) and its lower portion mounted on the support bracket (110) to dampen vibrations generated between the vehicle body (300) and the cabin (200); A support link (130) having an upper portion mounted on the cabin (200) and a lower portion mounted on the support bracket (110) to support the cabin (200) together with the buffer (120); and A second stopper (150) for restricting the movement of the support link (130); comprising Agricultural tractor (10).

8. In Paragraph 7, The above second stopper (150) is, A first side panel (151) installed on the support bracket (110) and positioned adjacent to the support link (130); and A second side panel (152) installed on the support bracket (110) and positioned opposite the first side panel (151) with the support link (130) in between; comprising The second stopper (150) restricts the horizontal movement of the support link (130). Agricultural tractor (10).

9. In Paragraph 8, The above support link (130) is, A fixed arm (131) fixedly installed on the above support bracket (110); A movable arm (132) having one end connected to the cabin (200) and the other end connected to the fixed arm (131); and A hinge portion (133) that hinge-connects the fixed arm (131) and the movable arm (132); comprising, The support link (130) is such that the movable arm (132) rotates up and down relative to the hinge part (133). The above second stopper (150) is, It further includes an upper panel (153) connecting the upper portions of the first side panel (151) and the second side panel (152); The upper panel (153) is spaced apart from the support bracket (110) by a predetermined height to restrict the upward movement of the movable arm (132). Agricultural tractor (10).

10. In Paragraph 7, The above suspension device (100) is, A ball-shaped bar (160) having a lower portion installed on the support bracket (110) and having a long length in a direction perpendicular to the support bracket (110); and A detachment prevention pin (160-P) that is detachably coupled to the upper portion of the ball storage bar (160) to prevent the work tool ball (WB) inserted into the ball storage bar (160) from detaching; further comprising Agricultural tractor (10).

11. In Paragraph 10, The above ball bearing bar (160) is positioned further back than the second stopper (150). Agricultural tractor (10).

12. In Paragraph 7, The above support link (130) is, A fixed arm (131) fixedly installed on the above support bracket (110); A movable arm (132) having one end connected to the cabin (200) and the other end connected to the fixed arm (131); and A hinge portion (133) that hinge-connects the fixed arm (131) and the movable arm (132); comprising, The support link (130) allows the movable arm to rotate and move in the up and down direction relative to the hinge part (133), The above second stopper (150) is, A first side panel (151) installed on the support bracket (110) and positioned adjacent to the support link (130); A second side panel (152) installed on the support bracket (110) and positioned opposite the first side panel (151) with the support link (130) in between; and It includes an upper panel (153) connecting the upper portions of the first side panel (151) and the second side panel (152); and The upper panel (153) is spaced apart from the support bracket (110) by a predetermined height to restrict the upward movement of the movable arm (132). Agricultural tractor (10).

13. In Paragraph 1 or 7, The above suspension device (100) supports the rear part of the cabin (200). Agricultural tractor (10).

14. In Paragraph 1 or 7, The above suspension device (100) is installed on the rear side of the cabin (200). Agricultural tractor (10).

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