JP2019182309A - Lever guide cover of travelling vehicle - Google Patents

Abstract

To provide a lever guide cover of a travelling vehicle that allows a lower lever guide part and an upper lever guide part included in the lever guide cover installed in an arc surface of a fender to be viewed easily from a seat.SOLUTION: In providing a lever guide cover 15 of a travelling vehicle A formed to have a lower lever guide part 22 and an upper lever guide part 23 through which front and rear two operation levers 20, 21 penetrate respectively, along an arc-shaped upper surface part of a fender 9 covering a wheel 2, the two lever guide parts of the lower lever guide part 22 and the upper lever guide part 23 are formed to be smaller than the overall curvature of a guide body surface 15a of the lever guide cover 15 in side view, or formed linearly, and machine body inside inclination of a guide surface 22a of the lower lever guide part 22 is formed to be larger than an upper side inclination.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a lever guide cover for a traveling vehicle.

Conventionally, various control levers are arranged on the side of the seat installed between the fenders and the fenders that are formed in a substantially arc shape and cover the inner and upper sides of the left and right wheels (rear wheels). For tractors (traveling vehicles) that perform various driving operations, the levers are operated by penetrating each operation lever separately through the left lever guide cover and right lever guide cover made of synthetic resin along the top arc of the fender. It is configured to do. (For example, Patent Document 1)
The left lever guide cover of the tractor is provided with a sub-shift operation lever for traveling speed shift and a PTO shift control lever in the front-rear direction, and the right lever guide cover has a position lever ( The position control lever) and the additional kit lever are arranged so that they can be operated in the front-rear direction in a state where they are juxtaposed in the left-right direction.
In addition, an operation lever for sub-transmission is arranged on the left lever guide cover in the same manner as that of Patent Document 1, and the main transmission lever is not arranged on the left lever guide cover, and the floor step inside the front part of the left fender. A tractor configured to perform a traveling work speed change operation of the tractor by standing up from the side is already known. (For example, Patent Document 2)

Japanese Patent Laid-Open No. 2006-155468 JP-A-8-276762

The tractor shown in Patent Document 1 has a sub-shift lever and a PTO shift lever arranged in the front-rear direction on the left lever guide cover, but the main shift lever is located at another location as shown in Patent Document 2, for example. However, since the lever guide cover is not provided, the lever installation space of the main transmission lever is largely occupied elsewhere. Therefore, in order to eliminate this drawback, it is desirable to dispose the main transmission lever in an empty space formed on the front side of the PTO transmission lever with respect to the lever guide cover.
However, since the front portion of the lever guide cover is a tight (large) descending rounded surface that follows the arc surface of the fender, when simply providing a lower lever guide portion that guides the main transmission lever through this portion, Since the guide surface has a steep downward slope, it is difficult for the operator sitting on the seat to accurately see the whole, so that the operator must operate the main speed change lever with an unstable leaning posture. There are problems such as difficulty in operability and easy misidentification.
And in the tractor which forms the upper lever guide part used as the lever guide part of the PTO shift lever and the lower lever guide part used as the lever guide part of the travel shift lever on the upper and lower surfaces of the left lever guide cover In addition to improving the above visual operability, in particular, a lever guide cover having a guide groove of MT specification and a guide groove of HST specification, for example, with different shapes of guide grooves of the lower lever guide portion, is made of synthetic resin. When manufacturing by molding, the lever guide cover must be manufactured by manufacturing a plurality of synthetic resin molds that form each guide groove required for each specification change, making the manufacturing work complicated and costly There are problems such as becoming high.

In order to solve the above-mentioned problems, the present invention is firstly arranged in a substantially arc shape and spaced apart in the front-rear and vertical directions along the upper surface of the fender 9 that covers the upper and inner sides of the wheel 2. In providing the lever guide cover 15 of the traveling vehicle A, which is formed by having the lower lever guide portion 22 and the upper lever guide portion 23 through which the two operation levers 20 and 21 are separately passed.
The two lever guide portions of the lower lever guide portion 22 and the upper lever guide portion 23 are made smaller than the entire curvature of the guide main body surface 15a of the lever guide cover 15 in a side view, or formed into a straight line. In addition, the inboard side inclination of the guide surface 22a of the lower lever guide portion 22 is larger than the upper inclination.
Secondly, the upper lever guide portion 23 is the lever guide portion of the PTO speed change lever 21, the lower lever guide portion 22 is the lever guide portion of the travel speed change lever 20, and the lever guide portion of the travel speed change lever 20 is the MT specification. The guide grooves 22b corresponding to the HST specifications are characterized in that the specifications can be selectively changed.

According to the first aspect of the present invention, the two operation levers are formed in a substantially arc shape and are spaced apart in the front-rear and vertical directions along the upper surface of the fender that covers the upper and inner sides of the wheel. When providing a lever guide cover for a traveling vehicle that is molded with a lower lever guide portion and an upper lever guide portion that penetrate each of the two lever guides, the lower lever guide portion and the upper lever guide portion are provided with two lever guides. Is smaller than the overall curvature of the guide body surface of the lever guide cover in a side view, or is linearly formed, and the inward side inclination of the guide surface of the lower lever guide portion is made higher than the upper inclination. By making it bigger,
On the lower side of the guide body surface that is inclined forward and downward along the fender, the lower lever guide portion formed by a gentle rounded surface or a straight flat surface with a small guide surface curvature is from the guide body surface. In the state where it is raised upward, the outer side is formed higher due to the large inclination toward the inner side of the vehicle body, so that the visibility of the guide portion from the rear can be enhanced without the operator taking a large crouching posture.
In addition, both guide surfaces with a flat operation surface make it easy to attach operation display means such as attaching labels to the operation surface, and suppress the occurrence of wrinkles by flat adhesive display. And visibility can be improved.
According to the second aspect of the present invention, the upper lever guide portion is the lever guide portion of the PTO shift lever, the lower lever guide portion is the lever guide portion of the travel shift lever, and the lever guide portion of the travel shift lever is the MT specification. And HST specifications, the corresponding guide grooves are made into a format that can be selectively changed.
For example, when synthetic resin molding of a lever guide cover having a guide groove corresponding to each of the MT specification and the HST specification with different specifications, a plurality of dedicated molding dies having different guide portions for each specification are manufactured separately. The lever guide cover for each specification change can be manufactured by changing only the child mold for forming each guide groove while commonly using one master mold, so only a part of the synthetic resin mold is changed or the guide is changed Specifications can be created only by post-processing of the hole, and it can be made into a simple and easy-to-make flat surface that does not require complicated rounded surface processing, so the difficulty of creating MT specifications and HST specifications separately In addition, the lever guide cover can be manufactured efficiently while reducing the cost.

It is a top view of the tractor to which the present invention is applied. It is an enlarged plan view which shows the principal part structure of a control part. It is a front perspective view which shows the structure of the left lever guide cover and operation lever of MT specification. FIG. 4 is a front perspective view of the left lever guide cover of FIG. 3. 4 shows a cross-sectional shape of the left lever guide cover of FIG. 4, (a) is a cross-sectional view taken along line AA, (b) is a cross-sectional view taken along line BB, and (c) is a cross-sectional view taken along line CC. It is. (A) is a top view of a left lever guide cover, (b) is a bottom view of a left lever guide cover. The structure of the left lever guide cover of a HST specification is shown, (a) is a top view, (b) is a bottom view. The manufacturing method of the left lever guide cover is shown, (a) is a plan view of the left lever guide cover formed with the lower lever guide portion in the non-hole state, and (b) is a lower lever guide portion in (a). It is a top view which shows the state which formed the guide groove of MT specification, (c) is a top view which shows the state which formed the guide groove of HST specification in the lower lever guide part of (a).

  An embodiment of the present invention will be described with reference to the drawings. A tractor A shown in FIG. 1 covers a body frame 3 supported by wheels such as a pair of left and right front wheels 1 and a rear wheel 2, and an upper surface side of an engine (not shown) installed on the front side of the body frame 3. A bonnet 4 and a control unit 6 disposed behind the bonnet 4 are provided, and a working machine 8 such as a tillage machine is installed behind the traveling machine body via a lifting link 7 so as to be lifted and lowered.

  The tractor A in the illustrated example is configured by an MT specification that travels and shifts engine power via a mechanical transmission speed change mechanism, and the control unit 6 has a range extending from the front to the top of the rear wheel 2 on the left and right outer sides. A pair of left and right metal fenders 9 covering in a circular arc shape are erected from both sides of the body frame 3 with the same configuration as the conventional one, thereby covering the upper and inner sides of the rear wheel 2 and the seat 10. Various operation levers, which will be described later, are arranged between the two.

At the rear part of the left and right fenders 9, a safety frame 11 is provided so as to surround the rear side of the seat 10 in a downward U shape, and is gripped on the surface (upper side) of the fender 9 when getting on and off the control unit 6. An assist bar 12 is provided.
On the upper surface side of the left and right fenders 9 having an arc shape, a left lever guide cover 15R and a right lever guide cover 15R are provided as lever guide covers (15) for operating and guiding a plurality of operation levers to be described later. It is arranged.

  The control unit 6 is not shown on the seat 10 on which the operator is seated, the steering handle 16 disposed on the front side thereof, the floor step 17 laid between the seat 10 and the steering handle 16, and the front lower side of the seat 10. The clutch pedal 18 and the brake pedal 18a are arranged on the left and right sides of the steering handle 16 on the lower side of the steering handle 16 and the like, which include a step rear cover 17a installed so as to surround the transmission case portion.

Various operation levers that are swung back and forth or in the left-right direction are arranged at predetermined positions on the left and right sides of the seat 10 to facilitate operations such as running and tilling.
That is, between the left fender 9 and the seat 10, an operation lever (transmission lever) 20 for switching the traveling speed and an operation lever (PTO transmission lever) for rotating and shifting the PTO shaft of the work implement 8 and the like. ) 21 are arranged apart from each other in the front-rear direction, and an auxiliary transmission lever 24 is arranged on the inner side (seat side) of both, and both of them can be guided by the left lever guide cover 15L in the manner described later. Is guided through.

On the other hand, between the right fender 9 and the seat 10, a position control lever 30 arranged so as to raise and lower a tilling work machine 8 shown in the figure via the lifting link 7, and automatic control of tilling depth are performed. The automatic depth lever 31 is erected with a sufficient distance in the left-right direction via a display guide surface 32 having a lever operation display interval (viewing interval). Both levers are guided through the right lever guide cover 15R.
In addition, in the basic arrangement of the operation levers described above, other operation levers such as an accelerator lever for operating the engine speed and an additional kit lever for operating an additional kit such as a work machine, etc., may be placed in a suitable place as necessary. Can be provided.

  Next, a lever guide cover structure attached to the fender 9 will be described with reference to FIGS. First, the left lever guide cover 15L and the right lever guide cover 15R as the lever guide cover (15) are manufactured by synthetic resin molding similar to conventional ones, and the arc fenders of the left fender 9 and the right fender 9 are on the arc upper surface side. It is manufactured so that it can be internally fitted to the mounting surface portion 9a that is recessedly formed along the. The left and right lever guide covers are detachably attached and fixed to the outer peripheral side by a plurality of bolts 9b in a state where the mounting surface formed on the back side of the guide main body surface 15a is positioned and set in each mounting surface portion 9a.

  The left lever guide cover 15L has a lower lever guide portion 22 and an upper lever guide portion 23, which guide the operation separately through the two operation levers 20 and 21, approximately along the upper surface of the arcuate fender 9. The arrangement structure is separated in the front-rear and vertical directions with respect to the guide body surface 15a having the rounded surface. An inclined mounting surface portion 15b having a guide surface 25a inclined downward is integrally formed on the inner side of the lever guide portions 22 and 23, and the auxiliary transmission lever 24 can be operated in the front-rear direction on the guide surface 25a. A guide groove 25b having an I-shaped long hole to be allowed is formed, and a sub-transmission lever guide portion 25 is configured to guide through the sub-transmission lever 24.

The lower lever guide portion 22 has an H-shaped guide groove 22b formed in the guide surface 22a so that the inserted shift lever 20 can be operated at four positions.
The upper lever guide portion 23 is formed with an H-shaped guide groove 23b in the guide surface 23a, and the PTO shift lever 21 to be inserted is aligned with the reverse rotation position so that the four-position shift operation can be performed.
The auxiliary transmission lever guide portion 25 allows the auxiliary transmission lever 24 to be operated at high and low speeds through a guide groove 25b formed in an I-shape in the front-rear direction on the guide surface 25a.

In the above configuration, the left lever guide cover 15L has a state in which the guide surface 22a of the lower lever guide portion 22 and the guide surface 23a of the upper lever guide portion 23 protrude upward from the upper surface of the guide main body surface 15a. In the side view, the guide surface 22a and the guide surface 23a have a guide surface curvature that is smaller than the overall curvature of the guide main body surface 15a.
That is, the left lever guide cover 15L in the illustrated example is formed so that the guide surfaces of the lower lever guide portion 22 and the upper lever guide portion 23 form a rounded surface or a straight flat surface in a side view. .

As a result, the left lever guide cover 15L protrudes upward with a small guide surface curvature at the lower side of the guide main body surface 15a which is inclined downward at the front side of the arc portion of the fender 9 with a small guide surface curvature. In order to achieve the installation mode, the operator can easily visually recognize the lower end side of the lower lever guide portion 22 from the rear without taking the bent posture in which the operator is greatly bent from the rear toward the front. ing.
Further, the guide surfaces 22a and 23a whose operation surfaces are formed in a flat shape make it easy to perform an operation of attaching an operation display means such as attaching a label 26 or applying a mark to the surfaces of the guide surfaces 22a and 23a. Etc. can be suppressed to make it easy to visually recognize. (Fig. 6)

As shown in FIGS. 4 and 5, the guide surface 22a and the guide surface 23a have a predetermined in-machine-side inclination angle θ that inclines upward toward the in-vehicle body side, and the left and right directions of the respective guide surfaces The inner side is lowered and the outer side is raised.
As a result, the guide surfaces 22a and 23a face each other in a direction substantially orthogonal to the operator's line of sight of the sitting posture, so that the label 26 and the like can be easily seen and a highly efficient gear shifting operation can be performed while suppressing a misidentification operation. ing.

Further, the left lever guide cover 15L in the illustrated example is configured such that the inward side inclination angle θ of the guide surfaces 22a and 23a is sequentially increased with respect to the rear guide surface. .
That is, for example, the left lever guide cover 15L has a height H1 of the guide surface 23a from the guide main body surface 15a shown in the cross section of FIG. 5A, and is rearward of the guide surface 22a as shown in the cross section of (b). The side height H2 is increased, and then, as shown in the cross section of (c), the front side height H3 that is on the front side is sequentially increased.

  According to this, in the seated work posture, the operator can easily see the guide surface 23a that is positioned closest to the rear by the gentle inward side inclination by the outer height H1. Also, when viewing the guide surface 22a that gradually becomes farther downward toward the front side, the guide surface 22a becomes higher from the outer height H2 due to the in-body side inclination angle θ that gradually increases as it goes downward. Therefore, the guide surface display of the label 26 and the like can be accurately visually recognized without taking an unreasonable posture.

Therefore, the left lever guide cover 15L that enhances the front side visibility in this way can be used even when the operator sees the guide surface 22a at the position instantaneously facing the lower left side and away from the seat 10 from the seat 10. Since it is easy to check the display surface, there is a feature that a speed change operation that prevents an erroneous operation can be performed efficiently and smoothly with an easy driving posture without erroneous visual recognition.
In addition, the last part of the guide surface 23a can be made the same height as the surface of the guide main body surface 15a if necessary.

Further, it is desirable to integrally form a rib portion 27 protruding downward in a thick shape at the groove edge between the guide surface 22a formed on a flat surface and the guide groove 22b opened on the guide surface 23a and the guide groove 23b. In this case, since the rib portion 27 reinforces the periphery of the groove, a flat and wide guide surface can be easily formed with strength on each lever guide portion. (FIGS. 5 and 6)
And the rib piece of the rib part 27 in this case shape | molds each lever guide part 22 and 23 as a child mold | die mentioned later with which the base | mold which molds the main body part of the left lever guide cover 15L synthetic resin is replaceable. It is preferable that the molding is performed in the direction in which the mold is removed.

Next, referring to FIG. 7, the HST specification left lever guide cover when the left lever guide cover 15L installed on the MT specification tractor A is used in correspondence with the HST specification tractor A provided with the HST transmission mechanism. 15L will be described. In addition, about the structure and effect | action similar to the thing of the said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.
The left lever guide cover 15L shown in the figure has a guide groove 22b having a substantially I-shape in the front-rear direction formed in the lower lever guide portion 22, and the operation lever 20 for HST speed change inserted in the guide groove 22b is neutral. The guide is movably operated in the front-rear direction from the position.

On the other hand, the upper lever guide portion 23 has a guide surface 23a having an H-shaped guide groove 23b similar to that shown in FIG. 5, and the guide groove 23b is used to rotate and change the PTO shaft of the tillage work machine 8 or the like. The PTO speed change lever 21 that penetrates is guided to guide the rotational speed change movement at each speed change position from the neutral position.
That is, the left lever guide cover 15L of the HST specification shown in FIG. 7 has the same structure as the left lever guide cover 15L of the MT specification shown in FIG. 5 and the guide main body surface 15a of the cover main body, and the lower lever guide portion. 22 and the upper lever guide portion 23 have the same outer peripheral shape in plan view, but both differ only in the shape of the guide groove 22a.

  As a result, a synthetic resin mold (mold) for manufacturing a plurality of left lever guide covers 15L having different specifications includes a lower guide part mold for molding a main part of the lower lever guide part 22 (not shown) and an upper side. The upper guide part mold for molding the main part of the lever guide part 23 and the main mold for molding the main body side with both of them removed. Then, each of the child molds of the lower guide part mold and the upper guide part mold of the MT specifications and the HST specifications is slid or fitted to the mother mold attachment part manufactured as the one mold. It is configured so that both can be assembled in a desired combination by means of mold exchange such as a mechanism.

  That is, the synthetic resin mold configured as described above can manufacture the HST specification left lever guide cover 15L after manufacturing the MT specification left lever guide cover 15L. In this case, first, from the mother mold, the MTST left lever guide cover 15L can be manufactured. Remove the lower guide part mold and the upper guide part mold of the specification, and replace the lower guide part mold and the upper guide part mold of the HST specification to the empty child mold mounting part. Accordingly, the synthetic resin for the HST specification left lever guide cover 15L can be easily and efficiently manufactured at low cost.

Therefore, when manufacturing the left lever guide cover 15L with different specifications, a single mold is used in common and a synthetic resin molding without separately producing a plurality of dedicated molding dies having different guide portions for each specification. Even if it is installed in the apparatus, only a desired child mold can be exchanged and manufactured efficiently.
In other words, it is possible to omit complicated processing of the mold for forming the guide part for a large and bulky mother mold, but it is only necessary to perform simple fitting processing for the child mold mounting part on this part, so it is simple and easy to handle. An easy and lightweight mother mold can be obtained, and an increase in manufacturing cost can be suppressed.

In the left lever guide cover 15L of FIG. 7, the straight line that makes the two guide surfaces 22a, 23a of the lower lever guide portion 22 and the upper lever guide portion 23 smaller than the entire curvature of the guide main body surface 15a in a side view. The guide surfaces 22a and 23a serving as display surfaces are formed into flat surfaces that are inclined toward the inside of the machine body and are formed so as to be raised toward the seat 10 side.
That is, in this case, each of the child molds for forming the lower lever guide portion 22 and the upper lever guide portion 23 is a curved surface that is complicated to mold the surface shape of the guide surfaces 22a and 23a and the guide groove pattern. Therefore, it can be efficiently and easily formed by plane processing without using a combination of the above.

Further, in order to make a plurality of guide surfaces 22a and 23a project in a divided state on the guide main body surface 15a formed with a cover surface having a large curvature so as to make it easier to visually recognize and mold the display surface, each display surface is projected and molded. The child mold for the lower lever guide portion 22 and the child mold for the upper lever guide portion 23 can be separately manufactured.
As a result, the synthetic resin molding die can be reduced in size and weight of the double-piece mold and can be easily processed individually. Different molding can be simplified, and it is easy to perform simultaneous machining by connecting the two during plane machining, enabling individual production with high surface accuracy and making the mold production cost as possible There is a feature that it can be reduced.

Next, referring to FIG. 8, the left lever guide cover 15L installed on the MT-specific tractor A and the HST-specific tractor A having the HST speed change mechanism are provided by a simple and low-cost means from one master having the basic structure. An embodiment for manufacturing corresponding to the above will be described. In addition, about the structure and effect | action similar to the thing of the said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.
First, the left lever guide cover 15L shown in FIG. 8 (a) has an overall shape formed by a mother die having a basic structure similar to that shown in FIG. 6 and FIG. The appearance of the guide portion 22 is partially different in that the guide groove 22 has a non-perforated flat groove-free surface 22c in which no guide groove 22b is formed.

The left lever guide cover 15L shown in FIG. 8B is provided with a guide groove 22b of MT specification similar to that shown in FIG. 6 on the groove-unprocessed surface 22c of FIG. The present invention relates to an embodiment in which it is molded and used by processing.
The left lever guide cover 15L shown in FIG. 8 (c) is formed by separately performing groove processing of HST specifications similar to that shown in FIG. 7 on the groove-free surface 22c of FIG. 8 (a). It is the aspect used.

That is, the synthetic resin mold of the left lever guide cover 15L is used for the guide groove while keeping the outer shape of the guide surface 22a the same as that of the mold exchange part such as the slide or fitting mechanism of the basic mother mold of the above-described embodiment. It is desirable to adopt a configuration in which the lower guide part mold having a simple and flat forming head that does not have the hole forming function is exchanged as a child mold.
Then, the left lever guide cover 15L molded with synthetic resin thereby becomes a flat surface 22a having no guide groove 22b in the lower lever guide portion 22 as shown in FIG. The left lever guide cover 15L can be used for various working machines such as a tractor having no specifications. Also, if necessary, the flat surface 22a can be easily mounted with various switches, instruments, lamps, and other equipment, so it is applicable not only to the left lever guide cover 15L but also to the right lever guide cover 15R. There are also advantages such as increased versatility.

  Then, the flat surface 22a of the left lever guide cover 15L to be mass-produced is formed by punching and pressing the groove shape of the MT-shaped H-shaped and HST-shaped I-shaped and arbitrary-shaped guide grooves 22b in the outer contour thereof. In addition, it is possible to freely select the specifications by only post-processing using a laser drilling device or the like, and it is possible to easily and inexpensively cope with the need for many kinds of small-quantity production without requiring a large number of special child molds. Accordingly, the present invention can be optimized for the production of small agricultural tractors that are particularly demanded for multi-model small-volume production.

A Tractor (traveling vehicle)
2 Rear wheels
9 Fender (15) Lever guide cover 15L Left lever guide cover 15R Right lever guide cover 15a Guide body surface 20 Traveling gear shift lever (control lever)
21 PTO speed change lever (control lever)
22 Lower lever guide portion 22a Guide surface 22b Guide groove 23 Upper lever guide portion

Claims (2)

Two operation levers (20), which are formed in a substantially arc shape and are spaced apart in the front-rear and up-down directions along the upper surface of the fender (9) covering the upper and inner sides of the wheel (2), In providing the lever guide cover (15) of the traveling vehicle (A) which is molded to have the lower lever guide portion (22) and the upper lever guide portion (23) which penetrate (21) separately,
The two lever guide portions of the lower lever guide portion (22) and the upper lever guide portion (23) are made smaller than the overall curvature of the guide main body surface (15a) of the lever guide cover (15) in a side view. A lever guide cover for a traveling vehicle, wherein the lever guide cover is formed in a straight line, and the inboard side inclination of the guide surface (22a) of the lower lever guide portion (22) is larger than the upper inclination.   The upper lever guide portion (23) is the lever guide portion of the PTO speed change lever (21), the lower lever guide portion (22) is the lever guide portion of the travel speed change lever (20), and the lever of the travel speed change lever (20). The lever guide cover for a traveling vehicle according to claim 1, wherein the guide portion has a guide groove (22b) corresponding to the MT specification and the HST specification.

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