JPH0653584U - Driver's cab support device for driver's cab mobile work vehicle - Google Patents

Abstract

(57) [Abstract] [Purpose] In a cab mobile work vehicle, lower the mounting position of the cab with respect to the swivel base to improve the stability of the vehicle and increase the side-view. [Operation] An operation in which a driver's cab 5 is arranged beside a revolving base 2 having a pair of left and right revolving frames 3A, 3B, and the driver's cab 5 can be selectively set to a traveling position and a working position. In a room moving type work vehicle, a lower end portion 3Aa of a revolving frame 3A located on the driver's cab 5 side is provided with a pair of side plates 11 and 12 spaced apart from each other, and a supporting tubular shape extending in the front-rear direction of the revolving base 2. The body 10 is formed, and the telescopic beam 20 supporting the driver's cab 5 is slidably fitted into the supporting tubular body 10. With such a configuration, the supporting tubular body 10 that movably supports the driver's cab 5 and the telescopic beam 20 are not located below the driver's cab 5. The mounting height of the chamber 5 can be set low.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a driver's cab support device in a driver's cab mobile work vehicle in which a driver's cab for traveling and working can be moved in the front-rear direction of the vehicle.

[0002]

[Prior art]

 Conventionally, in work vehicles such as crane vehicles, where the driver's cab is used both when the vehicle is traveling and when working, the driver's cab is used in the front-rear direction of the swivel platform, especially from the viewpoint of ensuring forward visibility during traveling. Depending on the usage situation of the work vehicle, the driver's cab is selectively set to the running position near the front of the swivel base during running and to the working position near the center of the swivel base during working. It is known to obtain them (see, for example, Japanese Utility Model Laid-Open No. 62-203191).

[0003]

[Problems to be solved by the device]

 However, in the conventional cab mobile work vehicle such as the above-mentioned publicly known example, since the moving mechanism for guiding and supporting the cab is arranged below the cab, in order to secure the space for arranging the moving mechanism, The mounting position of the driver's cab with respect to the swivel platform is inevitably high, and as a result, for example, the position of the center of gravity of the work vehicle as a whole is increased, and stability is impaired. Since the occupant's eye point also rises as the vehicle rises, the boom, whose base end is pivotally supported by the swivel when the vehicle is traveling, is stored with the boom extending forward of the vehicle from the swivel. Therefore, there is a great possibility that the boom hinders the occupant's lateral field of view, which causes a problem such that the advantage of securing the field of view of the cab mobile work vehicle is diminished.

Therefore, the present invention makes it possible to set the mounting position of the driver's cab with respect to the swivel as low as possible in the driver's cab support device of the driver's cab mobile work vehicle, and thus stabilize the vehicle by lowering its center of gravity. It is intended to improve driving performance and driving safety by expanding the visibility during driving.

[0005]

[Means for Solving the Problems]

 As a concrete means for solving such a problem in the invention of the present application, in the invention of claim 1, the vehicle body frame is provided with a pair of left and right revolving frames 3A, 3B for pivotally supporting the base end portion of the boom so as to be capable of driving up and down. A driver's cab 5 is arranged on the side of a turntable 2 mounted so as to be capable of turning on the vehicle 1, and the driver's cab 5 is located at a running position located near the front of the turntable 2 when the vehicle is running, and when operating, the above-mentioned In a cab mobile work vehicle which can be selectively set to a working position located near the center of the swivel base 2, at least one of the pair of swivel frames 3A, 3B of the swivel base 2 is the cab 5 The lower end 3Aa of the swivel frame 3A located on the side is composed of a pair of side plates 11 and 12 facing each other in the width direction of the swivel base 2 and separated from each other. In the front-back direction To form a building support tubular body 10, to the support cylinder for shaped body 10, it is characterized in that slidably brought fitted stretch beam 20 that supports the above cab 5.

According to a second aspect of the invention, in the cab support device for a cab mobile work vehicle according to the first aspect, the front end portion 5a of the cab 5 is supported by the tip portion 20a of the telescopic beam 20. It is characterized by

According to a third aspect of the present invention, in the cab supporting device for a cab mobile work vehicle according to the first or second aspect, the rear end portion 5b of the cab 5 is connected to the rear end of the telescopic beam 20. It is characterized in that it is guided and supported by a rear support mechanism Y provided at a proper position on the rear of the portion 20b or the revolving frame 3A.

[0008]

[Action]

 With each of the inventions of the present application, the following actions can be obtained with such a configuration.

According to the first aspect of the invention, the telescopic beam 20 is slidably fitted in the supporting tubular body 10 provided at the lower end portion 3 Aa of the one swivel frame 3 A of the swivel base 2, and By supporting the operator's cab 5 on the telescopic beam 20, the operator's cab 5 moves in the front-back direction of the swivel base 2 as the telescopic beam 20 expands and contracts with respect to the supporting tubular body 10, and the traveling position or the working position is improved. It is set to the hour position.

In this case, the supporting tubular body 10 supporting the driver's cab 5 and the telescopic beam 20 are located at the lower end portion 3Aa of the one revolving frame 3A located on the side of the driver's cab 5, and Since they are not under the cabin 5, compared to the case where they are located under the cabin 5, the mounting space for the cabin 5 is not required, and the cabin 5 is mounted on the swivel base 2. It is possible if the height can be set low.

According to the second aspect of the present invention, in addition to the above-described operation, the front end portion 5a of the operator cab 5 is usually a space for arranging a vehicle control device such as an instrument panel and a steering wheel, and a passenger's boarding space. Is located rearward of the front end portion 5a, so that even if the front end portion 5a of the operator's cab 5 is restricted in space in the vertical direction due to the mounting mechanism for the telescopic beam 20, the rear end portion 5a is located behind the front end portion 5a. There is no effect on the passenger's boarding space, so it is possible to lower the passenger's eyepoint by setting this passenger seating area sufficiently low.

According to the third aspect of the present invention, in addition to the above or the above-mentioned action, the rear end portion 5b of the operator cab 5, which is further rearward than the passenger seating portion, is usually a space for arranging accessories. Therefore, even if the rear end portion 5b is guided and supported by the rear support mechanism Y, this does not prevent the height of the occupant riding portion from being set low. It is possible to reduce the eye point of the occupant while increasing the support rigidity of the cab 5.

[0013]

[Effect of device]

 Therefore, according to the driver's cab support device for the driver's cab mobile work vehicle of the inventions of the present application, the telescopic beam 20 and the supporting tubular body 10 for movably supporting the driver's cab 5 in the front-rear direction are provided in the driver's cab 5. By removing it from the lower side and disposing it on the lower end portion 3Aa of one of the swivel frames 3A, the mounting height of the cab 5 to the swivel base 2 can be set as low as possible. The lower the mounting position of the cab 5 is, the lower the center of gravity of the work vehicle as a whole is, which improves the stability against a fall, and the eye point of the occupant in the cab 5 is lowered, so that the cab of the cab 5 is lowered. Practical effects such as a reduction in the lateral visibility due to the boom that is stored and stored in the side and an increase in the running safety of the vehicle can be obtained.

[0014]

【Example】

 An application of the present invention to a mobile cab mobile crane will be specifically described below as an embodiment.

First Embodiment FIGS. 1 and 2 show a cab support device Z according to a first embodiment of the invention of the present application. In FIG. 1, reference numeral 1 is a vehicle body frame. A later-described swivel base 2 is rotatably attached to the shaft 1 via a swivel bearing 9. The swivel base 2 is for pivotally supporting a base end portion of a boom (not shown) so that the boom can be lifted and lowered. The swivel base member 4 is fastened and fixed to the swivel seat bearing 9, and the swivel base member 4 is provided. On the upper surface side of the swivel base member 4, there are provided a pair of swivel frames 3A, 3B which are arranged in parallel so as to face each other with the axis of the swivel bearing 9 interposed therebetween. Further, at a position directly outside one of the pair of turning frames 3A and 3B, which is located on the right side of the vehicle body, a driver's cab 5 to be described later is arranged along the turning frame 3A in the front-rear direction of the turntable 2. It is supported so that it can be moved to. For this reason, the one revolving frame 3A has the following novel structure in order to enable the arrangement of various mechanisms described later for movably supporting the cab 5.

That is, as shown in FIGS. 1 to 5, the revolving frame 3A is basically based on a single plate structure, but the lower end portion 3A a particularly near the revolving base member 4 has this structure. Is a double plate composed of a side plate 11 located substantially on the extension of the one plate portion and a side plate 12 located closer to the center of rotation than the side plate 11 and facing the side plate 11 at a predetermined interval. In addition to the structure, the upper and lower ends of the pair of side plates 11 and 12 are formed by the swivel base member 4 and the top plate 13 at a portion corresponding to the swivel base member 4 (see FIG. 3). In a portion extending forward of the swivel base member 4, the bottom plate 14 extendingly arranged at the end edge of the swivel base member 4 and the top plate 13 (see FIGS. 4 and 5) are connected to each other to have a substantially rectangular cross section. And along the swivel frame 3A A supporting tubular body 10 extending in the front-rear direction of the swivel base 2 is formed.

Further, a telescopic beam 20 having a rectangular cross section is fitted in the supporting tubular body 10 so as to be slidable in its axial direction. The telescopic beam 20 is arranged inside the telescopic beam 20, one end 19a of which is connected to the telescopic beam 20 via a front cylinder pin 25 as shown in FIG. 4, and the other end 19b thereof is shown in FIG. As shown in FIG. 5, the beam expanding / contracting cylinder 19 connected to the supporting tubular body 10 via the rear cylinder pin 26 is used to expand / contract. In this retractable beam 20, the tip end portion 20a of the telescopic beam 20 is projected forward from the tip end surface 10a of the supporting tubular body 10 by a predetermined dimension as shown by a solid line in FIGS. The state (in the following description, the position of the telescopic beam 20 at this time is referred to as the retracted position), and at its maximum extension position, as shown by the chain line in the figures, up to the vicinity of the front portion 1a of the body frame 1. The extended state (see reference numeral 20 '. In the following description, the position of the telescopic beam 20 at this time is referred to as the forward position).

Further, in order to lock the telescopic beam 20 in its forward and backward positions, respectively, as shown in FIG. 4, the side plate 12 of the supporting tubular body 10 is driven forward and backward by a locking cylinder 32. A lock mechanism 30 having a lock pin 31 is disposed, and the expandable beam 20 is provided with two pin receiving holes 33, 34 into which the lock pin 31 can be selectively engaged, as shown in FIG. It is formed with a space corresponding to the stroke of the beam 20. Therefore, the telescopic beam 20 is locked in the retracted position by engaging the lock pin 31 of the locking mechanism 30 with the first pin receiving hole 33 located near the tip portion 20a of the telescopic beam 20, and the rear end portion is locked. By engaging with the second pin receiving hole 34 located closer to 20b, it is locked in the forward position.

On the other hand, the operator's cab 5 is composed of a frame body having a front-rear direction dimension substantially equal to the axial length of the telescopic beam 20, and a portion near the front end portion 5a thereof is mainly used for steering, a crane operation lever and the like. It will be a space for placing control equipment. Further, the portion near the rear end 5b serves as a space for disposing hydraulic equipment and the like. The central portion 5d, which is located between the space for arranging the control equipment and the space for arranging the hydraulic equipment, etc., is a passenger's boarding space.

In order to support the operator's cab 5 having such a structure on the telescopic beam 20 at two positions, the front and rear supporting mechanisms X and Y, which will be described later, are provided on the telescopic beam 20. ing. First, as to the front support mechanism X, as shown in FIGS. 1 and 2, the front support mechanism X extends horizontally outward from the side surface of the distal end portion 20a of the telescopic beam 20 near the anti-rotation center. The first support arm 22 is attached in an extended state, and a pair of mount members 8 and 8 are provided at both ends of the first support arm 22 in the axial direction. The pair of mount members 8 support the front end portion 5a of the operation chamber 5 at two positions in the width direction. In this case, the bearing height of the operator cab 5 by the front support mechanism X is such that the lower end surface 5c of the operator cab 5 is slightly above the lower surface position of the telescopic beam 20 in the bearing state as shown in FIG. Is set to. Therefore, by setting the lower end surface 5c of the operator's cab 5 low in this way, the bearing mechanism inevitably becomes relatively higher than the lower end surface 5c of the operator's cab in the vicinity of the front end 5a of the operator's cab 5. Space will be allocated, but this part is a space for arranging the control equipment as described above, and there is no space in terms of space, so there is no problem.

On the other hand, as shown in FIGS. 1 to 3, the rear support mechanism Y includes the side plate of the support tubular body 10 from the side surface of the telescopic beam 20 near the anti-rotation center of the rear end 20b. 11. A second support arm 23 attached through the opening 15 formed in 11 so as to extend outward in the horizontal direction, and a pair provided at both ends in the axial direction of the second support arm 23. It is composed of the mounting members 8, 8. Then, the rear end portion 5b of the cab 5 is supported at two positions in the width direction by the pair of mounting members 8 of the rear support mechanism Y. In this case, the rear end portion 5b of the operator cab 5 also has a relatively high bearing height due to the presence of the rear support mechanism Y, and the space is accordingly divided, but this portion is supplemented as described above. Since it is a space for arranging the machines and there is originally a space to spare, no problems will occur.

Therefore, in the driver's cab 5, the central portion 5 d, which is most required to be arranged at a low position, that is, the passenger's boarding space portion, is located below the driver's cab 5 and has the above-mentioned supporting tubular body 10. Also, since there is no telescopic beam 20, it is not necessary to secure a space for arranging them, and even if the bearing heights at the front and rear two positions of the cab 5 are relatively high, this does not impose any restrictions. As a result, the mounting height can be set lower, and the eye point of the occupant can be set lower, and the center of gravity of the entire crane vehicle can be lowered. In particular, the lowering of the occupant's eye point means that the boom of the boom, which is pivotally supported by the swivel base 2 and extends substantially horizontally from the swivel base 2 toward the front side of the vehicle when the vehicle is traveling, is retracted. Considering that the placement height is constant, this leads to the expansion of the occupant's lateral field of view.

Further, in this embodiment, from the viewpoint of increasing the bearing rigidity of the operator cab 5 by the rear bearing mechanism Y, as shown in FIGS. 1 to 3, the axial direction of the second bearing arm 23 is A support roller 37 that rolls on the upper surface of the swivel base member 4 and a receiving roller 38 that opposes the lower surface of the swivel base member 4 at a predetermined interval are provided at an intermediate position. In addition to being supported, the supporting roller 37 and the receiving roller 38 suppress the vertical vibration of the cab 5. In order to allow the support roller 37 to roll, the side end of the swivel base member 4 near the support roller 37 is linearly extended in the front-rear direction of the swivel base 2.

When the operator cab 5 is supported by the front support mechanism X and the rear support mechanism Y configured as described above and connected together to the telescopic beam 20, the telescopic beam 20 is supported by the beam telescopic cylinder 19. By expanding and contracting, the cab 5 is moved in the front-back direction with respect to the swivel base 2, and when the expandable beam 20 is in the retracted position, the cab 5 is located near the center of the swivel base 2 (in the following, The position of the cab 5 in this case is referred to as a working position.) When the telescopic beam 20 is in the forward position (see reference numeral 20 '), the cab 5 projects toward the front side of the swivel base 2 and It is located in the vicinity of the front end 1a of the frame 1 (see reference numeral 5 '. In the following, the position of the cab 5 in this case is referred to as the traveling position).

Further, in this embodiment, from the viewpoint of ensuring the amount of forward movement of the cab 5 when the cab 5 is set to the traveling position, the front end 1a of the vehicle body frame 1 is Of the front right outriggers 6 and the left front outriggers 7 to be arranged, the front right outriggers 6 are arranged on the front side of the vehicle body with respect to the front left outriggers 7, and are supported on the outer box portion 6a of the front right outriggers 6. While the support pin 18 is provided, a support boss member 17 is provided at an intermediate position in the axial direction of the first support arm 22, and the support boss member 17 is provided on the support boss member 17 when the operator cab 5 is set at the traveling position. The support pin 18 is fitted so that the swing of the cab 5 can be regulated. The support pin 18 may be directly provided on the vehicle body frame 1 in addition to being provided on the front right outrigger 6 as in this embodiment.

When the mobile crane having such a structure is used, the driver's cab 5 is set to the traveling position when the vehicle is traveling and the working position is set when the vehicle is traveling. With the configuration, safer driving can be secured. That is, in the case of a crane vehicle, the tip of the boom generally projects largely forward from the front end 1a of the vehicle body frame 1 when traveling, so that the front end 1a of the vehicle body frame 1 should be located as much as possible when entering the intersection. Although it is required to visually check the situation at a close position, in this embodiment, since the traveling position of the cab 5 is set to a position near the front end 1a of the vehicle body frame 1 as described above, The safety confirmation by the occupant can be performed accurately and easily.

Further, in this case, in this embodiment, as described above, since the mounting height of the operator cab 5 with respect to the swivel base 2 is reduced to lower the occupant's eye point, The field of view of the vehicle, especially the field of view on the left side, is less likely to be obstructed by the boom, which makes it easier to confirm safety while driving and further enhances safe driving performance. Further, by lowering the mounting position of the cab 5 as described above, the position of the center of gravity of the entire crane vehicle is lowered, so that the stability of the crane vehicle against falling is improved accordingly.

In this embodiment, the beam expanding / contracting cylinder 19 is fitted inside the expanding / contracting beam 20. However, in other embodiments, the beam expanding / contracting cylinder 19 is mounted in the revolving frame 3A. It is also possible to expose and arrange the inside of the so as to be along the turning frame 3A.

Second Embodiment FIGS. 6 and 7 show a cab support device Z according to a second embodiment of the inventions of the present application. The driver's cab support device Z of this embodiment is different from that of the first embodiment only in the configuration of the rear support mechanism Y, and the other configurations are the same as those of the first embodiment. Only the structure of the rear support mechanism Y will be described in detail.

In the rear support mechanism Y, the second support arm 23 directly attaches the second support arm 23 to the rear end 20b of the expansion beam 20 in the first embodiment, whereas the support tubular body 1 described above. A guide rail 41 of a predetermined length attached to the side plate 11 of 0 in the front-rear direction of the swivel base 2 and slidable with respect to the guide rail 41 via a plurality of bearings 43, 43 ,. Two slide mechanisms 40, each of which is composed of a slider 42 fitted to the above, are arranged on the lower end portion 3Aa of the swivel frame 3A at a predetermined interval in the vertical direction. The second support arm 23 is movable in the front-rear direction of the swivel base 2 by being fixed to the base end of the second support arm 23.

Then, the rear end portion 5b of the cab 5 is supported by the pair of mount members 8, 8 provided on the second support arm 23, and each of the first support arms 22 fixed to the telescopic beam 20 side is supported. The front end portion 5a of the cab 5 is supported by the mount members 8,8. Therefore, when the telescopic beam 20 is telescopically driven by the beam telescopic cylinder 19, the second support arm 23 is indirectly pushed and pulled by the beam telescopic cylinder 19 via the cab 5, and the first support arm 23 is moved. It is possible to move the cab 5 together with the unit 22.

As described above, when the rear support mechanism Y is not directly attached to the telescopic beam 20 but is attached to the side plate 11 of the support tubular body 10, the second support is attached to the side plate 11 as in the first embodiment. Since it is not necessary to form the opening 15 for allowing the movement of the arm 23, there is an advantage that the rigidity of the revolving frame 3A can be improved.

Third Embodiment FIG. 8 shows a cab support device Z according to a third embodiment of the inventions of the present application. In the cab support device Z of this embodiment, the first support arm 22 is attached to the tip end portion 20a of the telescopic beam 20, and the cab 5 is mounted via the mount members 8 provided on the first support arm 22. Although the front end portion 5a is supported in the same manner as in each of the above-described embodiments, the support structure of the rear end portion 5b of the driving chamber 5 and the driving structure of the cab 5 are different from those in the above-described embodiments.

That is, in this embodiment, the support arm 24 including the pair of mount members 8 supporting the rear end portion 5b of the operator's cab 5 is provided with an outer cylinder fixed to the swivel base member 4 side. The inner cylinder member 52 is slidably fitted into the member 51 and fixed to the front end of the inner cylinder member 52. The inner cylinder member 52 is attached to the outer cylinder member 51 by the beam expansion / contraction cylinder 19 disposed therein. The support arm 24 is moved in the front-back direction of the swivel base 2 by being driven to expand and contract. In this case, the support roller 37 is provided on the bearing arm 24 to enhance the bearing rigidity of the bearing arm 24 (that is, the bearing rigidity of the operating chamber 5) by the inner tubular member 52.

Therefore, in this embodiment, the telescopic beam 20 is in a state of being telescopically driven by the beam telescopic cylinder 19 via the cab 5. In the case of the construction of this embodiment, since it is not necessary to form the opening 15 in the side plate 11 of the supporting tubular body 10, the rigidity of the revolving frame 3A can be maintained high. There is an advantage.

[Brief description of drawings]

FIG. 1 is a side view of a main part of a driver's cab support device in a driver's cab mobile work vehicle according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a plan view of a main part of a cab support device in a cab mobile work vehicle according to a second embodiment of the present invention.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a plan view of a main part of a cab support device in a cab mobile work vehicle according to a third embodiment of the present invention.

[Explanation of symbols]

1 is a body frame, 2 is a swivel base, 3A and 3B are swivel frames, 4 is a swivel base member, 5 is a driver's cab, 6 is a front right outrigger, 7 is a front left outrigger, 8 is a mount member, and 9 is swivel. Seat bearing, 10 is a cylindrical body for bearing, 11
Reference numerals 12 and 12 are side plates, 13 is a top plate, 14 is a bottom plate, 15 is an opening, 17 is a support boss member, 18 is a support pin, 19 is a beam expansion / contraction cylinder, 20 is an expansion beam, and 22-24.
Is a support arm, 25 is a front cylinder pin, 26 is a rear cylinder pin, 30 is a lock mechanism, 31 is a lock pin, 32 is a lock cylinder, 33 is a first pin receiving hole, 3
4 is a second pin receiving hole, 37 is a supporting roller, 38 is a receiving roller, 40 is a sliding mechanism, 41 is a guide rail, 42 is a slider, 43 is a bearing, 51 is an outer cylinder member, 52
Is an inner cylinder member, X is a front support mechanism, Y is a rear support mechanism, Z
Is a driver's cab support device.

Claims (3)

[Scope of utility model registration request] 1. A swivel base (2) provided with a pair of left and right swivel frames (3A), (3B) pivotally supporting a base end portion of a boom so that the boom can be raised and lowered, and swivel mounted on a vehicle body frame (1). ) Is located on the side of the driver's cab (5), and the driver's cab (5) is located at a traveling position near the front of the swivel base (2) when the vehicle is traveling, and the swivel base (2) is in operation. In a cab mobile work vehicle which can be selectively set to a working position located near the center of the vehicle, at least one of the pair of revolving frames (3A) and (3B) of the revolving base (2) is operated as described above. The lower end portion (3Aa) of the revolving frame (3A) located on the chamber (5) side is composed of a pair of side plates (11), (12) which are spaced apart to face each other in the width direction of the revolving base (2). The pair of side plates (11) and (12) form a supporting tubular body (10) extending in the front-rear direction of the swivel base (2), and A driver's cab support device for a driver's cab mobile work vehicle, characterized in that a telescopic beam (20) supporting the driver's cab (5) is slidably fitted in a bearing tubular body (10). . 2. The telescopic beam (2) according to claim 1,
0) The front end portion (5a) of the cab (5) is supported by the front end portion (20a) of the cab (0). 3. The cab according to claim 1 or 2,
(5) The rear end (5b) is the rear end of the telescopic beam (20).
(20b) or a cab supporting device for a cab mobile work vehicle, which is guided and supported by a rear supporting mechanism (Y) provided at a proper position in the rear of the revolving frame (3A).