Work vehicle

Abstract

To provide a work vehicle that can effectively and inexpensively suppress vibrations in the control unit. [Solution] A coil spring 21 is provided between a holding member 20 attached to the vehicle body and the control unit 16. The coil spring 21 holds the control unit 16 in place by the holding member 20 while suspending and supporting it, and also absorbs vibrations.

Description

Technical Field

[0001] The present invention relates to a work vehicle.

Background Art

[0002] As shown in Patent Document 1, there is a work vehicle (tractor) provided with a control unit (engine control unit).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] There is a case where the control unit is supported by a holding member provided on the vehicle body via a vibration isolator rubber, and the vibration isolator rubber reduces the vibration of the vehicle body transmitted from the holding member to the control unit. However, with the vibration isolator rubber, vibration reduction for vibrations in a high frequency band such as engine vibration cannot be effectively obtained. Even if the rubber hardness or the like is changed, only vibration reduction for vibrations of a limited frequency can be effectively obtained. In addition, in order to obtain a large vibration reduction effect, it is necessary to increase the number of rubber mounts, which increases the cost. Further, since the rubber material is easily affected by ultraviolet rays, heat, and chemical substances, depending on the usage environment conditions of the work vehicle, deterioration is promoted and the elasticity decreases, resulting in a decrease in the vibration absorption ability, so it is difficult to obtain a stable vibration reduction effect over a long period of time.

[0005] The present invention provides a work vehicle that can effectively and inexpensively suppress the vibration of a control unit.

Means for Solving the Problems

[0006] The work vehicle according to the present invention is The system includes a control unit, a holding member provided on the vehicle body, and a coil spring provided between the holding member and the control unit, which holds the control unit in a suspended state and absorbs vibrations.

[0007] In this configuration, vibrations between the retaining member and the control unit are absorbed by the elastic deformation of the coil spring. The coil spring can be easily adapted to the frequency and amplitude of vibrations by adjusting its material and shape. Furthermore, coil springs have a lower vibration transmission rate and more stable vibration absorption performance compared to rubber. In other words, since vibrations are absorbed between the retaining member and the control unit by a coil spring that is easily adapted to the frequency and amplitude of vibrations and has stable vibration absorption performance, vibrations in the control unit can be suppressed effectively and inexpensively.

[0008] In the present invention, Preferably, a guide rod formed on the control unit in an upward-extending manner is held by the holding member in a manner that allows it to pass through a unit holding portion provided on the holding member so as to be vertically movable, and the coil spring is fitted onto the guide rod above the unit holding portion and is sandwiched between a spring receiving portion provided on the guide rod and the unit holding portion to suspend and support the control unit, and is elastically deformed by the downward movement of the control unit relative to the holding member.

[0009] With this configuration, vibrations between the holding member and the control unit are absorbed by the coil spring, and in particular, vibrations of the control unit on the side descending relative to the holding member are effectively absorbed by the coil spring, thus effectively suppressing vibrations of the control unit.

[0010] In the present invention, Preferably, a guide rod formed in the control unit extending upward is held by the holding member so as to penetrate the unit holding portion provided in the holding member so as to be able to move up and down, the coil spring is fitted onto the guide rod above the unit holding portion and is sandwiched between a spring receiving portion provided on the guide rod and the unit holding portion to suspend and support the control unit and is elastically deformed by the downward movement of the control unit relative to the holding member, and a second coil spring is fitted onto the guide rod below the unit holding portion and is elastically deformed by the upward movement of the control unit relative to the holding member.

[0011] With this configuration, vibrations between the holding member and the control unit are absorbed by the coil spring and the second coil spring. In particular, vibrations of the control unit moving downward relative to the holding member are effectively absorbed by the coil spring, and vibrations of the control unit moving upward relative to the holding member are effectively absorbed by the second coil spring. Therefore, vibrations of the control unit can be effectively suppressed.

[0012] In the present invention, It is preferable that the guide rod, the coil spring, and the second coil spring are provided at multiple locations in the lateral direction of the control unit.

[0013] In this configuration, the control unit is suspended and supported by coil springs at multiple points, and vibration absorption is performed by the coil springs and second coil springs. As a result, vibration absorption is effectively performed across a wide frequency range in three dimensions, and vibrations of the control unit can be effectively suppressed.

[0014] In the present invention, Preferably, the guide rod forming member for forming the guide rod is connected to the control unit, thereby forming the guide rod on the control unit, and the guide rod forming member is connected to the control unit via a cushioning material.

[0015] With this configuration, vibration transmission from the guide rod forming member to the control unit is mitigated by the cushioning material, thus suppressing vibrations in the control unit. [Brief explanation of the drawing]

[0016] [Figure 1] This is a side view of the tractor, seen from the left side. [Figure 2] This is a side view showing the support structure of the control unit. [Figure 3] This is a front view showing the support structure of the control unit. [Figure 4] This is a cross-sectional view taken along line IV-IV in Figure 3. [Modes for carrying out the invention]

[0017] Hereinafter, an embodiment of the present invention will be described based on the drawings. In the following explanation, with respect to the tractor (an example of a "work vehicle"), the direction of arrow F shown in Figures 1 and 2 is referred to as the "front of the vehicle," the direction of arrow B shown in Figures 1 and 2 is referred to as the "rear of the vehicle," the direction of arrow U shown in Figures 1 and 2 is referred to as the "upper part of the vehicle," and the direction of arrow D shown in Figures 1 and 2 is referred to as the "lower part of the vehicle." The direction of arrow L shown in Figure 3, which is on the front side of the paper in Figure 1, is referred to as the "left side of the vehicle," and the direction of arrow R shown in Figure 3, which is on the back side of the paper in Figure 1, is referred to as the "right side of the vehicle." The left-right direction of the vehicle corresponds to the width of the vehicle.

[0018] [Overall configuration of the tractor] The tractor shown in Fig. 1 is a ride-on working machine configured by connecting various working devices such as a rotary tiller to the rear of the vehicle body. As shown in Fig. 1, the tractor has a traveling vehicle body 4 provided with a vehicle body frame 3. The vehicle body frame 3 is composed of an engine 1, a transmission case 2 extending rearward from the rear of the engine 1, etc. A pair of left and right front wheels 5 are provided at the front of the vehicle body frame 3 so as to be steerable and drivable. A pair of left and right rear wheels 6 are provided at the rear of the vehicle body frame 3 so as to be drivable. A prime mover portion 7 is formed at the front of the traveling vehicle body 4. The prime mover portion 7 is provided with the engine 1 and an engine bonnet 8, etc. A driver's cab 9 is formed at the rear of the traveling vehicle body 4. The driver's cab 9 is provided with a driver's seat 10, a steering wheel 11 for steering operation of the front wheels 5, and an instrument panel 12. At the rear of the transmission case 2, a link mechanism 14 for connecting the working device so as to be liftable and a power take-off shaft (not shown) for taking out power from the engine 1 and transmitting it to the working device are provided.

[0019] 〔Control Unit〕 As shown in Fig. 1, a control unit 16 (hereinafter referred to as "ECU16") is provided inside the rear portion 8a of the engine bonnet 8 behind the engine 1 and below the instrument panel 12. In the present embodiment, the ECU16 controls the engine 1.

[0020] As shown in Figs. 2 and 3, a holding member 20 provided on the traveling vehicle body 4 is provided above the ECU16, and the ECU16 is suspended and supported by a first coil spring 21 provided between the ECU16 and the holding member 20, and is held by the holding member 20 via the first coil spring 21. In the present embodiment, the first coil spring 21 is provided at two locations in the lateral width direction of the ECU16. Vibration is absorbed by the first coil spring 21 between the holding member 20 and the ECU16, and vibration of the ECU16 caused by traveling vibration and engine vibration transmitted to the holding member 20 is suppressed.

[0021] More specifically, as shown in Figure 2, the retaining member 20 is fixed to a support rod 23 that extends in the width direction of the vehicle body at a location corresponding to the rear of the retaining member 20. The retaining member 20 is fixed to the support rod 23 by welding. The support rod 23 is supported by a handle post 24, which is erected on the vehicle body frame 3. The retaining member 20 is installed on the vehicle body 4, connected to the vehicle body frame 3 via the support rod 23 and the handle post 24. The support rod 23 supports the clutch pedal 17 (see Figure 1), the brake pedal (not shown), and the like.

[0022] As shown in Figures 2 and 3, the retaining member 20 is made of a strip of material formed in a U-shape that opens backward in a plan view. A unit retaining portion 20a, which is made of an L-shaped plate member in a side view, is provided at the front of the retaining member 20. The L-shaped plate member is connected to the retaining member 20 by connecting bolts. Two upward-extending guide rods 26 are formed at two locations in the lateral direction of the ECU 16. The two guide rods 26 on the ECU 16 are formed by connecting a guide rod forming member 27, which has the two guide rods 26 at its top, to the ECU 16. The two guide rods 26 are inserted into through holes 20b provided in the unit retaining portion 20a so as to be able to move up and down, and are held up and down by the retaining member 20.

[0023] As shown in Figures 2 and 3, the first coil spring 21 is fitted onto the guide rod 26 above the unit holding portion 20a. The first coil spring 21 is sandwiched between the unit holding portion 20a and the first spring receiving portion 26a provided on the guide rod 26, and the ECU 16 is suspended and supported by the first spring receiving portion 26a receiving the unit holding portion 20a from below while the unit holding portion 20a acts as a reaction force receiving portion, thereby supporting the guide rod 26. The first coil spring 21 is elastically deformed by the ECU 16 descending relative to the holding member 20 while sandwiched between the unit holding portion 20a and the first spring receiving portion 26a.

[0024] As shown in Figures 2 and 3, at two locations where the first coil spring 21 of the ECU 16 is provided, the second coil spring 22 is fitted onto the guide rod 26 below the unit holding portion 20a. The second coil spring 22 is sandwiched between the unit holding portion 20a and the second spring receiving portion 26b provided on the guide rod 26, and is elastically deformed by the ECU 16 rising relative to the holding member 20. The second spring receiving portion 26b of the guide rod 26 is formed by the portion of the guide rod forming member 27 to which the guide rod 26 is fixed.

[0025] Driving vibrations and engine vibrations are transmitted to the retaining member 20, but the vibrations are mitigated between the retaining member 20 and the ECU 16 by the first coil spring 21 and the second coil spring 22, thereby suppressing vibrations in the ECU 16.

[0026] As shown in Figures 2 and 3, the guide rod forming member 27 is connected to each of the four connecting portions 16a formed on the ECU 16 via a cushioning material 28. The four locations where the connecting portions 16a are formed are two on the left and right sides of the upper part of the ECU 16 and two on the left and right sides of the lower part of the ECU 16. In this embodiment, the cushioning material 28 is a rubber cushioning material.

[0027] At two locations on the left and right sides of the lower part of the ECU16, the cushioning material 28 reduces vibration transmission between the guide rod forming member 27 and the ECU16, and the cushioning material 28 also reduces collision between the reinforcing member 24a (see 2,3) located behind the guide rod forming member 27 and the guide rod forming member 27.

[0028] More specifically, as shown in Figure 3, the reinforcing member 24a reinforces the handle post 24 by connecting the left and right vertical plate portions 24b of the handle post 24. As shown in Figure 4, the cushioning material 28 is fitted into the connecting hole 27a of the guide rod forming member 27. The cushioning material 28 is provided with a first cushion portion 28b and a second cushion portion 28c that sandwich the guide rod forming member 27 on the outer circumference side of the connecting hole 27a of the guide rod forming member 27. A connecting bolt 29 is inserted into the through hole 28a of the cushioning material 28 and the connecting hole 16b of the connecting portion 16a of the guide rod forming member 27, and the cushioning material 28 is attached to the guide rod forming member 27 by the connecting bolt 29. The second cushion portion 28c is sandwiched between the plate member 30 that constitutes the head of the connecting bolt 29 and the guide rod forming member 27. A cylindrical member 32, which fits inside the through hole 28a of the cushioning material 28, is provided between the connecting portion 16a and the plate member 30, and the tightening of the connecting bolt 29 is restricted by the cylindrical member 32. In other words, if the connecting bolt 29 is overtightened, the second cushion portion 28c is strongly squeezed between the plate member 30 and the guide rod forming member 27 and deforms excessively, causing the cushioning material 28 to lose its cushioning performance (elasticity). The cylindrical member 32 prevents the cushioning material 28 from losing its cushioning performance (elasticity). The plate member 30 is a single plate member attached across two connecting bolts 29 that are aligned in the lateral direction of the ECU 16, and constitutes the heads of the two connecting bolts 29.

[0029] As shown in Figures 2 and 4, a cushion member 31 is provided between the plate member 30 and the reinforcing member 24a to avoid direct contact between the plate member 30 and the reinforcing member 24a. In this embodiment, the cushion member 31 is made of cushioning rubber and is attached to the plate member 30 with adhesive. The cushion member 31 may not be attached to the plate member 30 but may be attached to the reinforcing member 24a. The cushion member 31 is provided with a cavity 31a into which the portion of the connecting bolt 29 protruding from the plate member 30 fits.

[0030] As shown in Figure 2, cushion members 31 are not provided at two locations on the left and right sides of the upper part of the ECU 16.

[0031] [Another embodiment] (1) In the embodiment described above, the first coil spring 21 suspends and supports the ECU 16 by suspending and supporting the guide rod 26. However, it may also be fitted onto the guide rod 26 below the unit holding portion 20a and connected to the unit holding portion 20a and the ECU 16 to suspend and support the ECU 16.

[0032] (2) In the embodiment described above, a second coil spring 22 is provided, but the second coil spring 22 may be omitted.

[0033] (3) In the embodiment described above, the first coil spring 21, the guide rod 26, and the second coil spring 22 are provided in two locations, but they may be provided in three or more locations.

[0034] (4) In the above embodiment, a cushioning material 28 is provided, but the cushioning material 28 may be omitted.

[0035] (5) In the embodiment described above, the ECU 16 controls the engine 1, but it is not limited to this, and may control something other than the engine, such as a connected work machine. [Industrial applicability]

[0036] This invention is not limited to tractors, but can be applied to various types of work vehicles such as rice transplanters, seeders, and pesticide sprayers. [Explanation of symbols]

[0037] 4. Vehicle body (vehicle body) 16 Control Unit 20 Retaining member 20a Unit holding part 21. First coil spring (coil spring) 22. Second coil spring 26 Guide rod 26a First spring support section (spring support section) 26b Second spring receiving section 27 Guide rod forming member 28 Cushioning material

Claims

1. Control unit and A retaining member attached to the vehicle body, A work vehicle is provided with a coil spring, which is placed between the holding member and the control unit, and which holds the control unit in the holding member in a suspended and supported state, and absorbs vibrations.

2. A guide rod formed in the control unit in an upward-extending manner is held by the holding member in a manner that allows it to pass through the unit holding portion provided in the holding member so as to be able to move up and down. The work vehicle according to claim 1, wherein the coil spring is fitted onto the guide rod above the unit holding portion and is sandwiched between the spring receiving portion provided on the guide rod and the unit holding portion to suspend and support the control unit, and is elastically deformed by the downward movement of the control unit relative to the holding member.

3. A guide rod formed in the control unit in an upward-extending manner is held by the holding member in a manner that allows it to pass through the unit holding portion provided in the holding member so as to be able to move up and down. The coil spring is fitted onto the guide rod above the unit holding portion and is sandwiched between the spring receiving portion provided on the guide rod and the unit holding portion to suspend and support the control unit, and is elastically deformed by the downward movement of the control unit relative to the holding member. A second coil spring is provided, fitted onto the guide rod below the unit holding portion. The work vehicle according to claim 1, wherein the second coil spring is sandwiched between the second spring receiving portion provided on the guide rod and the unit holding portion, and is elastically deformed by the upward movement of the control unit relative to the holding member.

4. The work vehicle according to claim 3, wherein the guide rod, the coil spring, and the second coil spring are provided at multiple locations in the lateral direction of the control unit.

5. The guide rod forming member that forms the guide rod is connected to the control unit, thereby forming the guide rod on the control unit. The work vehicle according to claim 2 or 3, wherein the guide rod forming member is connected to the control unit via a cushioning material.

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