JP2003238072A - Operator cab elevating device for work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operator cab elevating device for a work vehicle wherein an operator cab can be located in a higher position at an elevated position without projecting the operator cab from a car body at a lowered position, and without substantially increasing costs and the number of components. <P>SOLUTION: This operator cab elevating device is provided with an arm (14) connected with the upper center (X1) of a car body side and the lower center (Y2) of the operator cab side, a linkage mechanism (18) connected with the lower center (X2) of the car body side and the upper center (Y2) of the operator cab side including a lever (16) attached to the arm (14), and an arm driving cylinder (20). The operator cab (8) is elevated in parallel. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for raising and lowering a cab of a working vehicle. 2. Description of the Related Art At the site of waste disposal or the like, a high cab type vehicle in which a driver's cab such as a hydraulic shovel is disposed at a high position is used. Hoppers, shredders, dump trucks, etc., to efficiently input materials and waste materials. The high cab specification vehicle includes a fixed high cab specification vehicle in which the driver's cab is fixed to the high position of the vehicle body in advance, and the driver's cab is located at the "up position" and "down position" with respect to the vehicle body.
There is a lift-type high cab specification vehicle equipped with a lift device that can be raised and lowered between the vehicle and a traveling position, during transportation, or the like, so that the vehicle height can be lowered by setting the vehicle to a “down position”. A typical example of a driver's cab elevating device is disclosed in, for example, Japanese Utility Model Laid-Open No. 60-193873. This elevating device includes a parallel link mechanism including a pair of upper and lower parallel links between a cab and a vehicle body, and a drive cylinder that drives the parallel link mechanism. The cab is moved up and down in parallel between the "up position" and the "down position" by extending and retracting the drive cylinder. Getting in and out of the cab is performed at the cab "down position". [0004] However, the conventional cab lift of the above-described embodiment has the following problems to be solved. (1) Ascending position: It is desired that a high cab type vehicle has a higher "ascending position" in order to secure better visibility. However, if each of the upper and lower parallel links is lengthened for this purpose, the "up position" becomes higher accordingly, but the cab protrudes from the vehicle body in the "down position" by the lengthened link. This protrusion becomes an obstacle during transportation such as moving the work vehicle on a trailer at a site or when traveling by the work vehicle itself. Therefore, there is a limit to further increasing the "up position" of the cab by the conventional parallel link mechanism including a pair of parallel links. (2) Two-stage parallel link mechanism: To increase the "up position" of the cab and reduce the protrusion from the vehicle body at the "down position", see, for example, Japanese Patent Application Laid-Open No. 2001-262001.
As disclosed in JP-A-0952, it is proposed to provide a two-stage parallel link mechanism between a vehicle body and a driver's cab, each including a link drive cylinder, and to be able to drive each parallel link mechanism separately. Have been. However, the use of this method is limited because the number of parts is increased and the cost is significantly increased, the number of connection points of the parallel link mechanism is increased, and the driver's cab is likely to rattle, and a countermeasure is required. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and a technical problem of the present invention is to provide a work vehicle cab elevating device that raises and lowers a cab between an "up position" and a "down position". The driver's cab can be positioned at a higher position in the "elevated position" without increasing the protrusion of the driver's cab from the vehicle body in the "lower position", and the number of parts is not significantly increased, thus significantly increasing the cost. An object of the present invention is to provide a driver's cab elevating device that is prevented from being raised. [0008] According to the present invention, there is provided a driving cab elevating device for a working vehicle which solves the above technical problem.
An arm having a pair of upper and lower pivot centers arranged in each of the vehicle body and the driver's cab attached to the vehicle body, one end of which is rotatably connected to the upper center of the vehicle body, and the other end is rotatably connected to the lower center of the driver's cab side; A link mechanism rotatably connected between the lower center on the vehicle body side and the upper center on the cab side via the lever and a lever mechanism rotatably attached to the arm, and between the arm and the vehicle body via the lever; An intervening arm drive cylinder, and the cab is moved up and down in parallel between a "down position" and a "up position" with respect to the vehicle body by swinging the arm by the arm drive cylinder. A cab lift device for a work vehicle is provided. The length of an arm connected between the vehicle body and the operator's cab, which swings the operator's cab between the "down position" and the "up position", is set to four sides of the conventional vertical parallel link. By making the length of the diagonal of the shape, the amount of protrusion of the cab in the "lower position" is substantially the same as that of the conventional case, and the cab can be positioned at a higher position in the "up position". I do. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a hydraulic shovel of a working vehicle, which is a typical working vehicle. This will be described in further detail. Referring to FIG. 1 showing the cab at the "up position" and FIG. 2 showing the "down position", mainly with reference to FIG. 1, a hydraulic shovel generally designated by the numeral 2 is a crawler type lower part. The vehicle includes a traveling body 4 and an upper revolving body 6 which is a vehicle body mounted on the lower traveling body 4 so as to be freely rotatable in a horizontal direction, and a cab 8 is provided at a front portion of the upper revolving body 6 by a cab elevator 10. It is mounted so as to be able to move up and down between a “raising position (FIG. 1)” and a “lowering position (FIG. 2)”. The driver's cab 8 has a door 8a for getting on and off on a side surface. Although not shown, the upper revolving unit 6 includes a work arm, such as a boom and an arm, which is operated by a driver in the cab 8, and a work such as a bucket attached to the tip of the work arm. Equipment is installed. The cab raising / lowering operation can also be performed in the cab 8. The cab raising and lowering device 10 comprises a body-side upper center X1 and a body-side lower center X2 which are a pair of upper and lower rotating centers arranged on a base 12 provided on the upper swing body 6, and a cab facing the cab. 8 has an upper center Y1 on the operator's cab side and a lower center Y2 on the operator's cab side, which are a pair of upper and lower pivots, and one end is rotatable on the upper center X1 on the vehicle body side and the other end is on the lower center Y2 on the cab side. And a lever 16 rotatably attached to the middle of the arm 14 in the longitudinal direction thereof, between the lower center X2 on the vehicle body side and the upper center Y1 on the cab side via the lever 16. And an arm drive cylinder 20 interposed between the arm 14 and the base 12. FIGS. 1 and 2 are enlarged views of a portion of the cab raising / lowering means 10 of FIG. 1 and an enlarged plan view of the cab 8 and the cab raising / lowering means 10 of FIG. 1 as viewed from above. The description will be continued with reference to FIG. The base 12 is the upper revolving unit 6
The cab 8 is symmetrically set within the same width as the left and right sides of the driver's cab 8 in the left and right directions (the direction perpendicular to the plane of FIG. 1 and FIG. 3; the vertical direction in FIG. 4). Plate-like brackets 12a, 12b, and 12c are provided upright from the outside. 1 and 3, viewed from the side, an upper center X1 on the vehicle body side and a lower center X2 on the vehicle body side are positioned at an interval W, and each has a pin hole through which a pin is inserted. It is formed to extend in the width direction of the table 12. An arm 14 is provided between the bracket 12a and the bracket 12b.
The link mechanism 18 is rotatably mounted at one end of the link mechanism 18 between the bracket 12b and the bracket 12c by a pin 24 at one end of the link mechanism 18 at one of the left and right sides thereof. Detailed)). Also, a vehicle body upper center X1 and a vehicle body lower center X2
Between the bracket 12a and the bracket 1
One end and the head side end of the arm driving cylinder 20 are rotatably mounted on the left and right sides of the arm driving cylinder 20 by pins 26, for a total of two positions on the left and right sides. At the lower end of the rear part of the cab 8, plate-like brackets 8 a are provided symmetrically on both sides in the left-right width direction (the direction perpendicular to the plane of FIG. 1 and FIG. 3, the vertical direction in FIG. 4).
8b and 8c are erected respectively. These brackets 8a, 8b, 8c are connected to the brackets 12 of the base 12.
a, 12b, and 12c are provided at substantially the same intervals in the left-right width direction. Then, the cab-side upper center Y1 and the cab-side lower center Y2 are positioned with an interval W therebetween,
A pin hole into which a pin is inserted extends in each of the left and right width directions of the cab 8. The other end of the arm 14 is provided between the brackets 8a and 8b by pins 28, and the other end of the link mechanism 18 is provided between the brackets 8b and 8c by pins 30. It is mounted rotatably. As viewed from the side (FIG. 3), the upper center X on the vehicle body side
1 and the lower center X2 on the vehicle body side, and the upper center Y on the driver's cab side.
1 and the line connecting the driver's cab side lower center Y2 are positioned substantially parallel to each other when the arm 14 and the link mechanism 18 are connected. The arm 14 is formed by integrally connecting a pair of left and right arm members 14a, 14a having the same shape by two connecting members 14b, 14b inserted therebetween. The arm member 14a is formed in a belt shape having a length L between centers X1 and Y2 at both ends by, for example, a thick steel plate. The connecting member 14b is formed by cutting a steel pipe, for example, and both ends are welded and joined to the arm members 14a, 14a. A pin hole that defines a rotation center Z1 for attaching the lever 16 of the link mechanism 18 is formed substantially at the center of a line connecting the centers X1 and Y2 at both ends of each of the arm members 14a and 14a. Arm members 14a, 14
The other end of the arm drive cylinder 20 and the rod-side end are rotatably attached to each of a by a pin 32 between the center Y2 and the rotation center Z1. The link mechanism 18 is attached to the center of rotation Z1 of the arm 14 by a pin 34, and has a center of rotation Z2 at the lower end.
A pair of left and right levers 16 and 16 having a rotation center Z3 at the upper end thereof, and a pair of left and right links 38 and 38 respectively connected to the lower center Z2 by a pin 36 and to the vehicle body lower center X2 by a pin 24. And a pin 40 at the upper center Z3.
Thus, a pair of left and right links 42, 42 respectively connected to the upper center Y1 of the cab side by the pins 30 are provided. The links 38, 38, 42, 42 are formed in a belt shape by a thick steel plate. Between the pair of left and right links 42, 42, a connecting member 43 formed by cutting a steel pipe, for example, is welded and joined to each. A pair of levers 1
6, 16 are left and right arm members 14a, 14a, respectively.
, And the portions of the rotation centers Z2 and Z3 of the upper and lower ends are formed in a forked shape, respectively, and the link 38,
42 are positioned and connected therebetween. The rotation centers Z1, Z2 and Z3 of the lever 16
Are positioned on the same line as viewed from the side surface (FIGS. 1 and 3), and the distances between the rotation centers Z1 and Z2 and between the rotation centers Z1 and Z3 are defined to be the same as W described above. X38 of link 38
The distance between Z2 is the same as the distance between X1 and Z1 of the arm 14, and the distance between Y1 and Z3 of the link 42 is the arm 14
Are defined the same as the distance between Y2 and Z1. The base 12, the operator's cab 8, the arm 14, and the link mechanism 18 allow the two parallelograms, X1, X2, Z2, Z1, and Y1.
Y2, Z1, and Z3 are formed. Therefore, when the arm 14 swings up and down about the rotation center X1, the cab 8 is translated in the up and down directions by the action of these parallelograms. The arm drive cylinder 20 is a well-known double-acting hydraulic cylinder. A total of two arm members are provided corresponding to the pair of arm members 14a of the arm 14, respectively. The arm drive cylinder 20 is operated by a hydraulic source provided on the upper swing body 6 and pressure oil from a control valve (not shown). Between the operator's cab 8 and the base 12, electric wiring for control, hydraulic piping, and the like are guided along the arm 14 between the left and right arm members 14a, 14a by a well-known link chain (not shown). It is arranged. Then, the above-described control valve can be operated in the cab 8. At the periphery of the cab 8, catwalks 44 and 46 in the form of rectangular flat plates are provided at the left side and the front side of the entrance door 8a, respectively. Non-slip plates 44a and 46a are attached to the upper surfaces of the treads of the catwalks 44 and 46, respectively. Driver's cab 8
In addition, a step 48 formed by bending a round bar member or a pipe member, which is a scaffold for getting on and off the catwalk 44, is provided below the rear side of the catwalk 44. By this step 48, the step 50 provided on the lower traveling body 4, the upper surface of the crawler belt 4 a of the lower traveling body 4, the step 48, and the catwalk 44 are relayed to the cab 8 at the “down position” shown in FIG. You can get on and off. Referring to FIGS. 5 and 6, the operation of the above cab lift 10 will be described. FIGS. 5 and 6 show the operation of the lever and the link mechanism in the operator's cab elevating device 10 in comparison with a conventional operator's cab elevating device. In the illustrated explanatory diagram, "the present embodiment" and "the conventional embodiment" are distinguished and shown. Note that the same reference numerals are given to portions corresponding to the portions described in the above embodiment. (1) Lowering position: FIG. 5 shows the operator's cab "lower position". The operator's cab 8 in the "form of the present invention" and the "conventional embodiment" is positioned vertically with respect to the base 12 which is a vehicle body. In the same position. That is, in the vertical direction, the lower surface of the cab 8 is at the height V0,
The horizontal distance between the vehicle and the rear surface of the cab 8 is defined as H1. (2) Raised position: FIG. 6 shows the cab "raised position". The cab 8 in the "form of the present invention" and the "conventional form" includes a base 12 and a rear surface of the cab 8 in the horizontal direction. Are positioned at H2 at the highest vertical position V1 of the driver's cab 8 in the "conventional mode" in the horizontal direction. In this state, the highest position in the vertical direction of the cab 8 in the “present embodiment” is positioned at V2 higher than V1 in the “conventional embodiment”. This V1 and V
As is apparent from FIG. 6, in the “conventional embodiment”, the driver's cab-side lower center Y2 is connected to the vehicle-body-side lower center X1 by a link having a length M. ], The lower center Y2 on the cab side is the upper center X1 on the vehicle body side.
Are connected by an arm 14 having a length L longer than the length M. 5, the length M is defined by the length of one side X2, Y2 of the parallelogram X1, X2, Y2, Y1, whereas the length L is the diagonal line X1.・ Because it is specified by the length of Y2. (3) Foremost position: Further, as shown by a two-dot chain line in FIG. 6, the "foremost position" of the cab 8 with respect to the base 12, that is, the front end of the cab 8 from the base 12 is the foremost. Since the length L of the arm 14 of the “form of the present invention” is longer than the length M of the “form of the prior art”, the horizontal length to the position is different from the horizontal position H3 of the “form of the conventional”. It becomes H4 further forward than that, and the range of ascending and descending movement of the cab 8 becomes wider. (4) Therefore, in the "form of the present invention", the protrusion of the cab 8 from the vehicle body (base 12) at the "down position" as shown in FIG. Without being raised, as shown in FIG.
In this case, the driver's cab 8 can be positioned at a higher position, and the number of parts is not greatly increased as compared with the case of using two parallel link mechanisms as in the prior art, so that the cost is not significantly increased. it can. Further, as shown by the two-dot chain line in FIG. 6, the “frontmost position” can be increased, the moving range of the cab 8 can be widened, and the working efficiency of the work vehicle can be further improved. As described above, the present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above-described embodiments. It can be modified or modified. (1) Working vehicle: In this embodiment,
Although a hydraulic shovel is shown as a work vehicle, the cab lift device according to the present invention can be applied to various work vehicles having a cab, such as a crane truck and a cargo work vehicle. (2) Lever: In this embodiment,
The arm 14 connecting the base 12 which is a vehicle body and the operator's cab 8 includes a pair of left and right arm members 14a, 14a. According to the configuration of the work vehicle and the operator's cab, the arm is one, Alternatively, the number may be three or more. (3) Center of rotation: In the present embodiment, the distance between the upper center X1 on the vehicle body side of the base 12 and the lower center X2 on the vehicle body, and the upper center Y1 of the cab 8 on the cab side and the cab. The distance from the center Y2 is defined to be the same, but the distance may be different. In that case,
The dimensions of the arm and link mechanism connected between them may be modified so that the cab 8 can move up and down in parallel. According to the working vehicle cab elevating device constructed in accordance with the present invention, the operating vehicle cab elevating device for raising and lowering the cab between the "up position" and the "down position". In, the cab can be positioned at a higher position in the "up position" without increasing the protrusion of the cab from the vehicle body in the "down position". Further, it is possible to prevent the number of parts from being significantly increased, and therefore, the cost from being significantly increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a hydraulic shovel, which is a working vehicle equipped with a cab lift device configured according to the present invention, in a cab “up position”.
Left side view shown in FIG. FIG. 2 is a left side view of the hydraulic excavator shown in FIG. 1 in a cab “down position”. FIG. 3 is an enlarged view of a part of a cab lifting device of the hydraulic shovel shown in FIG. 1; FIG. 4 is an enlarged plan view showing the driver's cab and the driver's cab elevating device as viewed in the direction of arrows AA in FIG. 1; FIG. 5 is a diagram illustrating the operation of the operator cab elevating device, in which the “present embodiment” and the “conventional embodiment” are shown side by side at the operator cab “lower position”. FIG. 6 is a diagram for explaining the operation of the cab raising / lowering device, in which the “present embodiment” and the “conventional embodiment” are shown side by side in the cab “up position”. [Description of References] 2: Hydraulic excavator (working vehicle) 6: Upper revolving body (body) 8: Driver cab 10: Driver cab elevating device 12: Base (body) 14: Arm 16: Lever 18: Link mechanism 20: Arm drive cylinder X1: Upper center on the vehicle body side (rotation center) X2: Lower center on the vehicle body side (rotation center) Y1: Upper center on the cab side (rotation center) Y2: Lower center on the cab side (rotation center)

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Tosumi Omiya             1-2-2 Sakuragaoka, Setagaya-ku, Tokyo             Luma Technica Co., Ltd. F-term (reference) 2D015 EA04

Claims (1)

Claims 1. An upper end of a pair of upper and lower rotation centers disposed in a vehicle body and a driver's cab attached to the vehicle body, one end is located at an upper center on a vehicle body side and the other end is located at a lower center on a driver's cab side. An arm rotatably connected to the arm, and a link rotatably connected between the lower center on the vehicle body side and the upper center on the cab side via the lever including a lever rotatably attached to the arm; A mechanism, and an arm drive cylinder interposed between the arm and the vehicle body, and the cab is moved up and down with respect to the vehicle body by swinging the arm by the arm drive cylinder. And a driver's cab elevating device for a work vehicle, which is moved up and down in parallel between the operator and the vehicle.