JP2019077274A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle capable of easily reducing the resonance vibration of a cabin. A cabin is provided with a dynamic vibration absorption mechanism 30. The dynamic vibration absorbing mechanism 30 is a weight member 31 that is laid horizontally on the upper part of the cabin frame 20 and extends in the width direction of the vehicle body, and a weight member that is supported at the center of the weight support member 31 in the width direction of the vehicle body. Has 34. The weight support member 31 is an elastic material having an elastic modulus smaller than that of the cabin frame 20. [Selection diagram] Fig. 2

Description

  The present invention relates to a working vehicle supported by a traveling vehicle body via a cushioning material and provided with a cabin that covers an operating unit.

  As a working vehicle mentioned above, there is a tractor shown, for example in patent documents 1. In the tractor disclosed in Patent Document 1, the cabin frame is supported by the cabin brackets of the airframe on both the front and rear sides of the left and right sides of the cabin via anti-vibration rubber.

JP, 2011-25844, A

  In the above-described work vehicle, vibration transmission from the traveling vehicle body to the cabin is suppressed by the cushion material, but depending on the vibration of the traveling vehicle body, the cabin may resonate. When the cabin resonates and vibrates, the ride becomes worse.

  An object of the present invention is to provide a work vehicle capable of reducing the resonance vibration of a cabin in a simple manner.

The work vehicle according to the invention is
A cabin supported by a traveling vehicle body via a cushioning material and covering an operating unit,
In the cabin, there is provided a weight supporting member which is horizontally extended at the upper part of the cabin frame and extends in a direction along the vehicle body width direction, and a weight member supported at a central portion in the vehicle body width direction of the weight supporting member. Equipped with
The weight support member is an elastic material having a smaller elastic modulus than that of the cabin frame.

  According to this configuration, in view of the resonance frequency of the cabin determined by the cabin weight and the vibration isolation mount rigidity, when the cabin resonates and vibrates by appropriately setting the elastic modulus of the weight support member and the mass of the weight member. The members vibrate in the opposite phase or the phase near the opposite phase to absorb cabin vibration.

  Therefore, cabin vibration can be reduced with a simple structure in which only the weight support member and the weight member are added.

  In the present invention, the dynamic vibration absorbing mechanism includes a forward elastic support member extending from the central portion forward in the vehicle body forward direction along the vehicle longitudinal direction and having a smaller elastic modulus than that of the cabin frame, and the central portion And a rearward facing elastic support member having a modulus of elasticity smaller than that of the cabin frame and extending in the vehicle body longitudinal direction from the rear to the rear of the vehicle body, wherein the weight member includes the central portion via the forward facing elastic support member. Preferably, a front weight member supported by the rear weight member and a rear weight member supported by the central portion via the rear-facing elastic support member are provided.

  According to this configuration, when the cabin resonates and vibrates in pitching and bouncing of the traveling vehicle body, the front weight member and the rear weight member elastically deform the weight support member and vibrate in the opposite phase or the phase near the opposite phase to vibrate the cabin. Absorb When the cabin resonates due to rolling of the traveling vehicle body, the front weight member and the rear weight member elastically deform the forward elastic supporting member and the rearward elastic supporting member while vibrating in the opposite phase or the phase near the opposite phase to vibrate the cabin. Absorb. Even if any of pitching, bouncing and rolling occurs on the traveling vehicle body, cabin vibration can be reduced.

  In the present invention, the dynamic vibration absorbing mechanism is preferably accommodated in the roof portion of the cabin.

  According to this configuration, it is possible to cover the dynamic vibration absorbing mechanism at low cost by utilizing the roof portion as a cover for the dynamic vibration absorbing mechanism.

  In the present invention, a pair of left and right air conditioning ducts distributed and accommodated in both lateral sides of the roof portion and extending in a direction along the longitudinal direction of the vehicle body are provided, and the weight members of the dynamic vibration absorbing mechanism are the pair of left and right It is preferable that the air conditioner is accommodated in the roof portion between air conditioning ducts.

  According to this configuration, since the empty space between the air conditioning ducts is utilized for the accommodation space of the weight member, it is possible to prevent the roof from becoming thick due to accommodation of the dynamic absorption mechanism while preventing or suppressing It can be used for the cover.

It is a left side view showing the whole of a tractor. It is a perspective view which shows a cabin frame and a dynamic vibration absorption mechanism. It is a front view which shows a dynamic vibration absorption mechanism. It is a top view which shows a dynamic vibration absorption mechanism. It is an explanatory view showing operation of a dynamic vibration absorption mechanism. It is an explanatory view showing operation of a dynamic vibration absorption mechanism. It is an explanatory view showing operation of a dynamic vibration absorption mechanism.

  Hereinafter, a case where an embodiment of the present invention is applied to a tractor as an example of a work vehicle will be described based on the drawings. FIG. 1 is a left side view showing the entire tractor. The direction of [F] shown in FIG. 1 is the forward direction of the traveling vehicle body 1, the direction of [B] is the backward direction of the traveling vehicle body 1, the direction of the front of the paper is the left of the traveling vehicle 1, and the direction of the paper back is the traveling vehicle 1. Define as the right direction of

  As shown in FIG. 1, the tractor is provided with a traveling vehicle body 1 in which a pair of left and right front wheels 2 are steerable and drivable, and a pair of left and right rear wheels 3 are drivable. A driving unit 4 is formed at the front of the traveling vehicle body 1. The motive power unit 4 is provided with an engine 5 and an engine bonnet 6 that covers the engine 5. An operating unit 7 is formed at the rear of the traveling vehicle body 1. The driver 7 is provided with a driver's seat 8 and a steering wheel 9 for steering the front wheel 2. The driving unit 7 is covered by a cabin 10. A link mechanism 11 is provided at the rear of the traveling vehicle body 1 so as to be able to move up and down.

  The tractor constitutes a riding type cultivator by, for example, being connected to a rear portion of the traveling vehicle body 1 via a link mechanism 11 so that a rotary cultivating device (not shown) can be moved up and down.

  The vehicle body frame 12 of the traveling vehicle body 1 includes an engine 5, a transmission case 13 whose front portion is connected to the rear of the engine 5, and a front frame 14 extended from the lower portion of the engine 5 toward the vehicle front. The left and right front wheels 2 are supported by the front frame 14 via a front wheel drive case (not shown). The left and right rear wheels 3 are supported at the rear of the transmission case 13. The power from the engine 5 is input to the transmission case 13 and transmitted from the transmission case 13 to the left and right rear wheels 3. The power input to the transmission case 13 is output from the transmission case 13 in the forward direction of the vehicle body, input to the front wheel drive case, and transmitted to the left and right front wheels 2 from the front wheel drive case.

  As shown in FIG. 1, the cabin 10 includes a cabin frame 20, a windshield 15 mounted on the front of the cabin frame 20, a rear glass 16 installed on the rear of the cabin frame 20, and an upper portion of the cabin frame 20. An equipped roof portion 17 and side glasses 18 mounted on both lateral sides of the cabin frame 20 are provided. An entrance door 19 is provided on both sides of the cabin 10. The left and right entrance doors 19 are provided on the front side of the side glass 18 so as to be able to swing open and close.

  As shown in FIG. 1, cabin support portions 13 a are formed at two front and rear locations on the left lateral side of the transmission case 13 and at two front and rear locations on the right lateral side. The lower portion of the cabin frame 20 is supported by the four cabin support portions 13a via the cushion rubbers 21, and the cabin 10 has cushion rubbers 21 on the traveling vehicle body 1 at four locations: left front, left rear, right front and right rear. It is supported through. Vibration transmission from the traveling vehicle body 1 to the cabin 10 is suppressed by the cushion rubber 21. In the present embodiment, the cushion rubbers 21 are provided at four places, but may be provided at more than four places. In the present embodiment, the cushion rubber 21 is adopted, but various cushion materials such as a spring can be adopted instead of the cushion rubber 21.

  As shown in FIG. 1, a dynamic vibration absorbing mechanism 30 is provided at the top of the cabin 10. The resonance vibration of the cabin 10 due to the vibration of the traveling vehicle body 1 is reduced by the dynamic vibration absorbing mechanism 30, and in detail, it is configured as follows.

  As shown in FIG. 2, the cabin frame 20 includes a lower frame 23, an upper frame 24, a pair of left and right front vertical frames 25, a pair of left and right middle vertical frames 26, and a pair of left and right rear vertical frames 27. The lower frame 23 is connected to the four cabin support portions 13 a via the cushion rubber 21.

  As shown in FIG. 2, the lower frame 23 includes a pair of left and right middle frames 23 a extending in the longitudinal direction of the vehicle body and a pair of lower side frames 23 b extending in the longitudinal direction of the vehicle body. An intermediate portion in the front-rear direction of the left and right lower side frames 23b is formed in an arc shape along the rear wheel fender 37 (see FIG. 1). A front connecting frame 23c is connected to the front of the left and right lower side frames 23b. The front connecting frame 23c is provided with a shielding wall 23e that shields the engine compartment and the driving unit 7. A rear connecting frame 23d is connected to the rear of the left and right lower side frames 23b. A support frame 22 is connected between the rear of the left and right middle frames 23a and the rear connection frame 23d.

  As shown in FIG. 2, the upper frame 24 includes a pair of upper side frames 24 a extending in the front-rear direction of the left and right vehicle bodies. The front connection hood 24b is connected to the front end portions of the left and right upper side frames 24a. The rear connection frame 24c is connected to the rear end portions of the left and right upper side frames 24a.

  As shown in FIG. 2, the lower frame 23 and the upper frame 24 are connected by a front longitudinal frame 25 at the front left corner and the front right corner of the cabin frame 20. An intermediate portion in the front-rear direction of the lower side frame 23 b and an intermediate portion in the front-rear direction of the upper side frame 24 a are connected by the middle vertical frame 26. The lower frame 23 and the upper frame 24 are connected by a rear vertical frame 27 at the rear left corner and the rear right corner of the cabin frame 20.

  As shown in FIG. 2, the dynamic vibration absorbing mechanism 30 includes a weight support member 31 extending in the lateral direction of the vehicle body, a forward elastic support member 32, a backward elastic support member 33, and a front weight member 34 f and a rear side as weight members 34. And a weight member 34r.

  The weight support member 31 is connected to middle portions in the front-rear direction of the upper side frame 24 a in the upper frame 24 and is straddled over the upper portion of the cabin frame 20. The forward elastic support member 32 extends from the middle portion of the weight support member 31 in the lateral direction of the vehicle along the longitudinal direction of the vehicle in the forward direction of the vehicle. The rearward elastic support member 33 extends from the middle portion of the weight support member 31 in the lateral direction of the vehicle toward the rear of the vehicle along the longitudinal direction of the vehicle. The weight support member 31, the forward elastic support member 32 and the backward elastic support member 33 have an elasticity smaller than that of the lower frame 23, the upper frame 24, the front longitudinal frame 25, the middle longitudinal frame 26 and the rear longitudinal frame 27 in the cabin frame 20. It is comprised by the elastic material which has a modulus. In the present embodiment, the weight support member 31 is formed of a band plate member, but not limited to the band plate member, various members such as a round bar member and a square bar member can be adopted. In the present embodiment, the forward elastic support member 32 and the backward elastic support member 33 are constituted by round bar members, but various members such as square bar members and plate members can be adopted. As the weight support member 31, the forward elastic support member 32, and the backward elastic support member 33, it is possible to use a metal member or a resin member.

  The front weight member 34 f is supported by the extension end of the forward elastic support member 32, and is supported by the intermediate portion of the weight support member 31 in the vehicle body lateral direction via the forward elastic support member 32. The rear weight member 34r is supported by the extension end of the rearward elastic support member 33, and is supported by the intermediate portion of the weight support member 31 in the vehicle body lateral direction via the backward elastic support member 33. A metal member or a resin member can be adopted as the front weight member 34 f and the rear weight member 34 r.

  Assuming that the resonance frequency of the cabin 10 (frequency determined by the weight of the cabin 10 and the rigidity of the cushion rubbers 21 at four places) coinciding with the frequency of the traveling vehicle body 1 is F, the mass of the front weight member 34f and the rear weight member 34r Assuming that the total mass with the mass of m is m and the spring constant by the weight support member 31 is K1, the spring constant K1 is set such that F = 1 / 2π × SQRT (K1 / m) is satisfied. Assuming that the spring constant of the forward elastic support member 32 and the spring constant of the backward elastic support member 33 are K2, the spring constant K2 is set such that F = 1 / 2π × SQRT (K2 / m) is satisfied. However, SQRT () is a function indicating a square root.

  FIG. 5 is an explanatory view (as viewed from above) illustrating the operation of the dynamic vibration absorbing mechanism 30 when the cabin 10 resonates and vibrates during pitching of the traveling vehicle body 1. The direction of [F] shown in FIG. 5 is the forward direction of the traveling vehicle body 1, and the direction of [B] is the rearward direction of the traveling vehicle body 1. As shown in FIG. 5, when the cabin 10 resonates and vibrates during pitching of the traveling vehicle body 1, the front weight member 34 f and the rear weight member 34 r elastically deform the weight support member 31 and have an opposite phase or an opposite phase to the cabin 10. The vibration of the cabin 10 is absorbed by the vibration of the front weight member 34f and the rear weight member 34r.

  FIG. 6 is an explanatory view (as viewed from above) illustrating the operation of the dynamic vibration absorbing mechanism 30 when the cabin 10 resonates and vibrates due to the rolling of the traveling vehicle body 1. The direction of [F] shown in FIG. 6 is the forward direction of the traveling vehicle body 1, and the direction of [B] is the rearward direction of the traveling vehicle body 1. As shown in FIG. 6, when the cabin 10 resonates and vibrates due to rolling of the traveling vehicle body 1, the cabin 10 while the front weight member 34 f and the rear weight member 34 r elastically deform the forward elastic support member 32 and the rear elastic support member 33. The vibration of the cabin 10 is absorbed by the vibration of the front weight member 34f and the rear weight member 34r.

  FIG. 7 is an explanatory view (a view from the front) showing the operation of the dynamic vibration absorbing mechanism 30 when the cabin 10 resonates and vibrates in the bouncing of the traveling vehicle body 1. The direction of [U] shown in FIG. 7 is the upward direction of the traveling vehicle body 1, and the direction of [D] is the downward direction of the traveling vehicle body 1. As shown in FIG. 7, when the cabin 10 resonates and vibrates in the bouncing of the traveling vehicle body 1, the front weight member 34 f and the rear weight member 34 r elastically deform the weight support member 31 and have an opposite phase or an opposite phase to the cabin 10. The vibration of the cabin 10 is absorbed by the vibration of the front weight member 34f and the rear weight member 34r.

  As shown in FIG. 3, the roof portion 17 includes an outer roof 17 a and an inner roof 17 b. An inner space S of the roof portion 17 is formed by the outer roof 17a and the inner roof 17b. As shown to FIG.3, 4, the duct 35 for air conditioning is accommodated in the left side part and right side part of the internal space S. As shown to FIG. The left and right air conditioning ducts 35 are accommodated so as to extend in a direction along the longitudinal direction of the vehicle body, are supplied with air conditioning air from an air conditioning device 36 provided at the rear of the roof portion 17 and discharge the supplied air conditioning air. It supplies to the operation part 7 from 35a.

  As shown in FIGS. 3 and 4, the dynamic vibration absorbing mechanism 30 is accommodated in the inner space S with the front weight member 34f and the rear weight member 34r positioned between the left and right air conditioning ducts 35, and the outer roof 17a and It is covered by the inner roof 17b.

[Another embodiment]
(1) In the embodiment described above, the front weight member 34 f is supported by the weight support member 31 via the forward elastic support member 32, and the rear weight member 34 r is supported by the weight support member 31 via the backward elastic support member 33. However, the weight member 34 may be directly supported at the central portion of the weight support member 31 without providing the forwardly elastic support member 32 and the backward elastic support member 33.

(2) In the embodiment described above, the dynamic vibration absorbing mechanism 30 is housed in the roof portion. However, a dedicated cover may be provided outside the roof portion to cover the dynamic vibration absorbing mechanism 30.

  The present invention can be applied to various working vehicles such as combine harvesters and transport vehicles as well as tractors.

DESCRIPTION OF SYMBOLS 1 driving vehicle body 7 driving part 10 cabin 17 roof part 20 cabin frame 21 cushion material (cushion rubber)
30 Dynamic vibration absorbing mechanism 31 Weight support member 32 Forward elastic support member 33 Backward elastic support member 34 Weight member 34f Front weight member 34r Back weight member 35 Air conditioning duct

Claims (4)

A cabin supported by a traveling vehicle body via a cushioning material and covering an operating unit,
In the cabin, there is provided a weight supporting member which is horizontally extended at the upper part of the cabin frame and extends in a direction along the vehicle body width direction, and a weight member supported at a central portion in the vehicle body width direction of the weight supporting member. Equipped with
The work vehicle, wherein the weight support member is an elastic member having an elastic modulus smaller than an elastic modulus of the cabin frame. In the dynamic vibration absorbing mechanism, a forward elastic supporting member extending from the central portion in the vehicle body forward direction along the vehicle longitudinal direction and having an elastic modulus smaller than that of the cabin frame, and from the central portion toward the vehicle rear A rearward facing elastic support member is provided, which extends along the longitudinal direction of the vehicle body and has a smaller elastic modulus than that of the cabin frame.
As the weight member, a front weight member supported at the central portion via the forward elastic support member and a rear weight member supported at the central portion via the backward elastic support member are provided. The work vehicle according to claim 1.   The work vehicle according to claim 1, wherein the dynamic vibration absorbing mechanism is accommodated in a roof portion of the cabin. A pair of left and right air conditioning ducts are provided which are distributed and accommodated in both lateral sides of the roof portion and which extend in a direction along the longitudinal direction of the vehicle body,
The work vehicle according to claim 3, wherein the weight member of the dynamic vibration absorbing mechanism is accommodated in the roof portion between the pair of left and right air conditioning ducts.

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