JP2019137223A - Vehicle with loading platform lift - Google Patents

Abstract

To efficiently assemble parallel link mechanisms and a bumper arm to a vehicle body while reducing the weight of a vehicle, in the vehicle with a loading platform lift.SOLUTION: An attachment base part Ab of a loading platform lift A having left and right parallel link mechanisms L for guiding and supporting a loading platform T so as to be liftable, and a lift cylinder CL for exerting a drive force for oscillating the parallel link mechanisms upward comprises: a cross member 10 extending to a vehicle width direction; and left and right attachment members 1 which firmly adhere to each other with an interval at their outer surfaces. Each attachment member 1 has a lash member attachment part 21 attached with a lash member M for lashing the attachment members to a vehicle body F, a parallel link attachment part 22 attached with the parallel link mechanisms L, and a bumper attachment part 23 attached with a bumper 11. The cross member 10 is supported to the vehicle body F via the left and right attachment members 1 and the lash member M.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a load receiving platform lifting device that lifts and lowers a load receiving platform on which a load can be placed so that it can be used for loading and unloading loads between the ground and an in-vehicle load box, and to attach the load receiving platform lifting device to a vehicle body. The present invention relates to a vehicle with a cargo receiving platform lifting device provided with a mounting base.

  Such a load receiving table lifting device is already known as disclosed in Patent Document 1 below.

Japanese Utility Model Publication No. 1-173032

  In a vehicle with a load receiving table lifting device of Patent Document 1, a cross member fixed to the vehicle body is used as an attachment base of the load receiving table lifting device, and a lifting link mechanism and a bumper arm of the load receiving table lifting device are directly attached to the cross member. It is done. Although this structure has an advantage that interference between the lifting link mechanism and the vehicle body can be avoided without difficulty, there are also the following problems.

  In other words, since each mounting portion of the lifting link mechanism and the bumper arm has a pair of left and right, it is directly assembled to a long cross member with high accuracy while individually adjusting the horizontal mounting position and mutual position of all the mounting portions. The work is not easy in practice.

  Further, in the cross member, each mounting portion of the lifting link mechanism and the bumper arm is disposed at a position offset to the left and right from the coupling portion (mount bracket) between the cross member and the vehicle body. A relatively large bending load acts on Therefore, it is necessary to take measures to impart sufficient rigidity and strength to the cross member to counter this load. In this case, for example, if the thickness and dimensions of the entire cross member are increased, the weight of the cross member is increased. For example, if the entire cross member is formed of an expensive high-strength material, the cost may increase.

  The present invention has been proposed in view of the above, and an object of the present invention is to provide a vehicle with a load receiving platform lifting / lowering device that can solve the problems of conventional devices with a simple structure.

  In order to achieve the above object, the present invention provides a load receiving platform lifting device for lifting a load receiving platform on which a load can be placed so that it can be used for loading and unloading loads between the ground and an onboard load box. In a vehicle with a load receiving platform lifting device having a mounting base for mounting the platform lifting device to a vehicle body, the load receiving platform lifting device includes left and right parallel link mechanisms that guide and support the load receiving platform so as to be movable up and down, and the left and right parallel links. Left and right lift cylinders that generate a driving force that swings the mechanism upward, and the mounting base includes left and right mounting members that are secured to the outer surface of the cross member extending in the vehicle width direction at intervals. The attachment member includes a securing member attaching portion to which a securing member for securing the attaching member to a vehicle body is attached, a parallel link attaching portion to which the parallel link mechanism is attached, and a bumper attaching portion to which a bumper is attached. The have the cross member, the first feature to be supported on the vehicle body via the left and right mounting member and the lashing member.

  According to the present invention, in addition to the first feature, the cross member has a front and rear side plate portions and an upper plate portion integrally connecting the upper ends of both side plate portions, and has a reverse U-shaped cross section. And the front and rear side plate portions are respectively fixed to the front and rear side walls of the cross member, and a space is defined between the upper plate portion and the upper wall of the cross member. The second feature is that a nut or a bolt head among bolts and nuts for connecting the lashing member and the lashing member mounting portion is housed.

  According to the present invention, the mounting base for mounting the load receiving platform lifting device to the vehicle body includes left and right mounting members that are fixed to the outer surface of the cross member at a distance from each other, and each mounting member attaches the mounting member to the vehicle body. Since there are a lashing member mounting portion to which a lashing member to be lashed is mounted, a parallel link mounting portion to which a parallel link mechanism is mounted, and a bumper mounting portion to which a bumper is mounted, the load from the parallel link mechanism and the bumper Can be received by the vehicle body via the attachment member and the tying member, and the load on the cross member can be greatly reduced, which can contribute to weight reduction of the cross member. In addition, since the mounting member is a small part compared to the cross member, there is no risk of a substantial increase in weight and cost even if measures are given to provide sufficient rigidity and strength. This can contribute to cost savings.

  In addition, parallel link attachment parts, bumper attachment parts, and lashing member attachment parts can be collectively arranged on each of the left and right attachment members, which are small parts, so that the position adjustment work between these attachment parts can be performed accurately and efficiently. In addition, since the left and right mounting members in which the respective mounting portions are collectively arranged can be assembled to the cross member to form a sub-assembly, the left and right mounting members can be assembled to the vehicle body with high accuracy and efficiency. As a result, it is possible to greatly contribute to the improvement of workability of assembling the load receiving table lifting device to the vehicle body.

  According to the second feature, the cross member is formed in a square pipe shape with a pair of side walls facing the vehicle front-rear direction, and each mounting member is formed in an inverted U-shaped cross section, and the front and rear thereof The side plate portions of the cross member are fixed to the front and rear side walls of the cross member, and a space is defined between the upper plate portion of the mounting member and the upper wall of the cross member. Since either one of the bolts and nuts connecting between the member mounting parts is housed, the gap space between the upper plate part of the mounting member having a reverse U-shaped cross section and the upper surface of the cross member is effectively used. In addition, a part of the coupling means (the above-described nut or bolt head) between the lashing member and the lashing member mounting portion can be easily deployed, and the degree of freedom in designing the lashing member can be increased.

The whole side view which shows one Embodiment of the cargo handling vehicle provided with the load receiving stand raising / lowering apparatus of this invention Side view of the main part of the loading platform lifting device (enlarged side view of the part shown by arrow 2 in FIG. 1) Exploded side view of the main part of the loading platform lifting device Sectional view taken along line 4-4 of FIG. 2 (however, the solid lines of the cargo cradle and the body frame are not shown) Sectional view along line 5-5 in FIG. (A) is an enlarged sectional view taken along line 6 (a) -6 (a) in FIG. 5, and (b) is an enlarged sectional view taken along line 6 (b) -6 (b) in FIG. Exploded side view of the mounting base viewed from the same direction as FIG.

  Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

  In this embodiment, the load receiving platform lifting apparatus according to the present invention is applied to a cargo handling vehicle with a cargo box.

  1 to 7, a cargo box N is mounted on a body frame F of the cargo handling vehicle V, and a rear end opening of the cargo box N is an opening / closing door G provided at a rear end portion of the cargo box N. Can be opened and closed. A load receiving table elevating device A is attached to the vehicle body frame F located immediately below the rear portion of the cargo box N, and the load receiving table elevating device A includes a metal mounting base Ab for attaching this to the vehicle body frame F.

  The mounting base Ab includes a cross member 10 that extends linearly in the vehicle width direction, and left and right fixing frames 1 that are fixed to the outer surface of the cross member 10 at intervals. The vehicle body frame F is an example of a vehicle body, and the fixed frame 1 is an example of an attachment member.

  Each fixed frame 1 is attached with a lashing member attachment portion 21 to which a lashing member M (generally referred to as a mounting bracket) for tying the fixed frame 1 to the vehicle body frame F is attached, and a parallel link mechanism L of the load receiving platform lifting device A. The parallel link attaching part 22 and the bumper attaching part 23 to which the bumper 11 is attached are provided, and the specific structure of each attaching part 21 to 23 will be described later.

  The cross member 10 is formed in a square pipe shape (in the embodiment, the cross section is substantially rectangular) in which the pair of side walls 10f and 10r face the vehicle longitudinal direction. On the other hand, the fixed frame 1 has a substantially horizontal upper plate portion 1t that integrally connects the front and rear side plate portions 1f, 1r and the upper ends of both side plate portions 1f, 1r, and is formed in an inverted U-shaped cross section. Is done. The front and rear side plate portions 1f and 1r are fixed (for example, welding, bolt connection, etc.) to the front and rear side walls 10f and 10r of the cross member 10, respectively. The fixed frame 1 has a rear side plate portion 1r, which is a main mounting surface, of the front and rear side plate portions 1f and 1r, which is sufficiently long below the front side plate portion 1f, and particularly the rear side plate portion 1r. The lower end of the central portion of the cross member 10 extends below the lower wall 10t of the cross member 10.

  The upper surface of the upper plate portion 1t of the fixed frame 1 constitutes the above-described securing member attaching portion 21, and a space that is flat vertically between the upper plate portion 1t and the upper wall 10t of the cross member 10 is provided. S is defined. In this space S, a plurality of nuts 42 of bolts 41 and nuts 42 for connecting between the lashing member M and the lashing member attachment portion 21 are attached to each other at a predetermined interval (for example, welding). 43 is accommodated. The mounting plate 43 is coupled (for example, welded) to the lower surface of the upper plate portion 1t of the fixed frame 1.

  The lashing member M includes an L-shaped bent plate Ma and a reinforcing plate Mb that is coupled (for example, welded) so as to straddle the inner surface of the vertical plate portion Mav and the horizontal plate portion Mah of the bent plate Ma. doing.

  The bent plate Ma has a vertical plate portion Mav coupled to the side surface of the vehicle body frame F (for example, welding, bolt coupling, etc.), and the bottom surface of the horizontal plate portion Mah becomes the securing member attaching portion 21 of the fixed frame 1. It contacts the upper surface of the upper plate portion 1t. In this contact state, the bolt 41 penetrates the horizontal plate portion Mah of the bent plate Ma from above and is screwed and tightened to the nut 42, so that the fixed frame 1 is detachably coupled to the securing member M. The contact surface of the horizontal plate portion Mah with the head 41a of the bolt 41 is reinforced by a reinforcing plate 44 that overlaps with the contact surface.

  Thus, the fixed frame 1 (mounting base Ab) is coupled to and supported by the vehicle body frame F via the securing member M, and the cross member 10 is coupled to the vehicle body frame F via the left and right stationary frames 1 and the securing member M. Supported by

  In addition, in the space S, instead of accommodating the nut 42, the enormous head 41a of the bolt 41 may be accommodated. In that case, the bolt 41 is arranged so that the screw shaft portion protrudes upward from the horizontal plate portion Mah of the bending plate Ma.

  Next, a specific structure of the load receiving table lifting device A will be described.

  The load receiving table elevating device A includes a load receiving table T having a placement surface Tf on which a load can be placed, and left and right lifting drive devices D for driving the load receiving table Tf. In this embodiment, each elevating drive device D elevates and lowers the load receiving table T via the parallel link mechanism L that guides and supports the load receiving table T so as to be able to move up and down (more specifically, vertically swingable). And a hydraulically operated lift cylinder Cl to be driven.

  Thus, the elevating drive device D moves the parallel link mechanism L up and down in conjunction with the expansion and contraction operation of the lift cylinder Cl, thereby moving the load receiving platform T between the loading platform surface Nf of the cargo box N and the ground E. It can be moved up and down while maintaining a substantially horizontal posture. And by the raising / lowering operation | movement of the load receiving stand T, the load, the cart with a caster, etc. which were mounted on the load receiving stand T can be smoothly loaded / unloaded between the ground E and the loading platform surface Nf.

  First and second mounting stays 22 s 1 and 22 s 2 that are coupled (for example, welded) so as to straddle the upper plate portion 1 t and the rear side plate portion 1 r of the fixed frame 1 and project rearward are provided on the left and right sides. Are integrally provided at a small interval. The first mounting stay 22s1 made of a single thick plate has a stopper 2p pivotally supported by the upper end of the auxiliary link 2 so as to swing back and forth and fixed (for example, welded) to the front side edge of the auxiliary link 2. The plate 2s abuts against the outer surface of the rear side plate portion 1r on the rear side of the fixed frame 1 so as to be able to contact and separate. The auxiliary link 2 is normally held in contact with the fixed frame 1 because the weight of the load receiving tray T or the like acts on the auxiliary link 2 at all times. In this holding state, the fixed frame 1 and the auxiliary link 2 are held. Functions as a fixed link of the parallel link mechanism L to be described next, so that the link form of the parallel link mechanism L is maintained.

  The parallel link mechanism L includes the fixed link (that is, the fixed frame 1 and the auxiliary link 2), the upper arm 4 pivotally connected to the upper portion of the auxiliary link 2 and pivotally connected 4p, and the rear portion of the fixed frame 1 (specifically Specifically, the lower arm 5 pivotably connected to the second mounting stay 22s2) made of two thin plates and pivotally connected 5p, and the upper and lower arms 4 and 5 are pivotally spaced from each other. And a link plate 6 which can be pivotally connected 4p 'and 5p'.

  Thus, the link plate 6 functions as an output end portion of the elevating drive device D, and the upper arm 4 functions as a movable portion (movable link) of the elevating mechanism (parallel link mechanism L). The first and second mounting stays 22 s 1 and 22 s 2 cooperate with each other to form a parallel link mounting portion 22 provided on the fixed frame 1.

  In the present embodiment, the ends of the left and right upper arms 4 are integrally connected by the connecting member 7, but the connecting member 7 can be omitted.

  Further, one end portion of the lift cylinder Cl is rotatably connected to the lower portion of the auxiliary link 2 via the first pivot P1, and the other end of the lift cylinder Cl is connected to the middle portion or the front portion of the upper arm 4. The parts are connected via a second pivot P2 so as to be rotatable. Accordingly, the upper arm 4 (parallel link mechanism L) swings upward in conjunction with the extension operation of the lift cylinder Cl to raise the link plate 6 and moves downward as the lift cylinder Cl contracts. The link plate 6 is lowered by swinging.

  In the present embodiment, the other end of the lift cylinder Cl is connected to the upper arm 4 via the second pivot P2, but the other end of the lift cylinder Cl is connected to the lower arm via the second pivot P2. 5 may be connected.

  The base end of the load receiving platform T is pivotally connected to the upper portion of the link plate 6 via a third pivot P3. A hydraulically operated hoisting cylinder Ct for raising and lowering the load receiving table T is interposed between the rear surface of the load receiving table T and the upper and lower intermediate portions of the link plate 6. In the present embodiment, the third pivot P3 and the pivot connecting portion 4p 'between the upper arm 4 and the link plate 6 are arranged coaxially, but both of them need to be arranged coaxially. There is no.

  Thus, when the hoisting cylinder Ct is extended, the load receiving platform T rotates in the upright direction around the third pivot P3 with respect to the link plate 6, and the storage position T1 (the mounting surface Tf becomes substantially vertical). (See the chain line in FIG. 1). Further, when the hoisting cylinder Ct is contracted from the state in which the load receiving table T is at the storage position T1, the load receiving table T is rotated about the third pivot P3 with respect to the link plate 6 in the prone direction. Therefore, if the hoisting cylinder Ct is held at the contraction limit, the load receiving platform T is held at the horizontal deployment position T2 (see the solid line in FIG. 1) where the placing surface Tf is substantially horizontal regardless of the lift position of the link plate 6. .

  When the load receiving table T that is lowered by the contraction of the lift cylinder Cl is grounded while the load receiving table T is held at the horizontal deployment position T2, if the lift cylinder Cl is further contracted even after the contact, the auxiliary link 2 slightly swings rearward and the parallel link mechanism L is broken. As a result, the load receiving table T can be tilted to an inclined development position T3 (see a chain line in FIG. 1) in which the mounting surface Tf is inclined downward toward the tip of the load receiving table T. By this tilting, the load receiving table T and the ground The movement of luggage between E becomes smoother.

  A hydraulic pressure supply unit U is accommodated in the hollow portion of the cross member 10. Although not shown, the hydraulic pressure supply unit U includes a hydraulic motor and an oil tank that are hydraulic pressure supply sources for the lift cylinder Cl and the undulating cylinder Ct, and hydraulic oil supply / discharge control from the hydraulic pressure supply source to the cylinders Cl and Ct. And a control valve for arbitrarily operating the control valve. It should be noted that the hydraulic pressure supply unit U may be disposed at an appropriate position on the vehicle body frame F outside the cross member 10.

  The bumper 11 is disposed so as to protrude rearward from the mounting base Ab of the load receiving platform lifting device A, and is fixed to the bumper main body 11m and the bumper main body 11m (for example, welding, bolt connection, etc.). And a pair of left and right bumper arms 11a extending forward from the bumper body 11m. Each bumper arm 11a is formed in the shape of a square pipe, and the front end of the bumper arm 11a comes into contact with and joins (for example, welding) to the outer surface of the side plate 1r on the rear side of the corresponding fixed frame 1.

  In the present embodiment, the bumper 11 is made of metal (for example, iron). However, the bumper 11 may be made of a material other than metal (for example, a synthetic resin material), or as a composite of a metal material and a synthetic resin material. Also good.

  An intermediate portion of each bumper arm 11a is coupled to the vehicle body frame F via a secondary lashing member M ′ having a structure similar to that of the lashing member M described above. Note that the secondary tying member M ′ may be omitted.

  Further, the rear side plate portion 1r of each fixed frame 1 has a third mounting stay having a rear projecting portion 23sr projecting rearward on the opposite side to the second mounting stay 22s2 across the first mounting stay 22s1. 23s are coupled (for example, welded). Then, the side surface of the front end portion of the corresponding bumper arm 11a is coupled (for example, welded) to the side projecting portion 23sr.

  The third mounting stay 23 s has a front overhang 23 sf that projects forward from the rear side plate 1 r of the fixed frame 1. The front overhang 23sf is coupled (for example, welded) to the lower wall 10t of the cross member 10.

  Thus, the third mounting stay 23s and the outer side surface 1r outer surface of the rear side of the fixed frame 1 cooperate with each other to form the bumper mounting portion 23 of the fixed frame 1.

  Next, the operation of the embodiment will be described.

  In the present embodiment, the mounting base Ab for mounting the load receiving platform lifting apparatus A to the vehicle body frame F is fixed to the outer surface of the cross member 10 extending in the vehicle width direction and the left and right sides of the cross member 10 at intervals. And a fixed frame 1 as an attachment member. Each of the fixed frames 1 includes a lashing member attaching portion 21 (more specifically, an outer surface of the upper plate portion 1t) to which a lashing member M for tying the fixing frame 1 to the vehicle body frame F is attached, and a parallel link mechanism L. Are attached to the parallel link mounting portion 22 (more specifically, the first and second mounting stays 22s1, 22s2), and the bumper mounting portion 23 to which the bumper 11 is mounted (more specifically, the third mounting stay 23s and the rear side). Side plate portion 1r outer surface).

  Thereby, since the load from the parallel link mechanism L which acts at the time of raising and lowering the load receiving table T and the impact load from the bumper 11 can be firmly received by the vehicle body frame F via the fixed frame 1 and the securing member M, The load burden on the cross member 10 is greatly reduced, and the weight and cost of the cross member 10 can be reduced. In addition, since the fixed frame 1 that functions as an attachment member is a small component compared to the cross member 10, there is a risk that even if a measure for imparting sufficient rigidity and strength is taken, the weight and cost may increase. Absent. Therefore, as a whole, weight reduction and cost saving of the vehicle V can be achieved.

  In addition, since the parallel link attachment part 22, the bumper attachment part 23, and the securing member attachment part 21 can be collectively arranged on each fixed frame 1 which is a small part, the position adjustment work between the attachment parts 21 to 23 can be performed. It can be performed accurately and efficiently. Moreover, since the left and right fixed frames 1 (attachment members) in which the respective attachment portions 21 to 23 are centrally arranged can be assembled into a single cross member 10 to form a sub-assembly, the left and right fixed frames 1 (attachment members) are attached to the vehicle body frame F. As a whole, the workability of assembling the load receiving table lifting device A to the vehicle body frame F can be improved.

  Furthermore, the cross member 10 of this embodiment is formed in the shape of a square pipe with a pair of side walls 10f, 10r facing the vehicle front-rear direction, and the hollow portion is effectively used as an installation space for the hydraulic pressure supply unit U.

  Each fixed frame 1 (attachment member) has front and rear side plate portions 1f and 1r and an upper plate portion 1t and is formed in an inverted U-shaped cross section, and the front and rear side plate portions 1f and 1r are crossed. The members 10 are fixed to the front and rear side walls 10f and 10r, respectively. A space S is defined between the upper plate portion 1 t and the upper wall 10 t of the cross member 10, and a bolt 41 for connecting the lashing member M and the lashing member mounting portion 21 to the space S. The nut 42 of the nut 42 or the head 41a of the bolt 41 is housed.

  Accordingly, since the gap space S between the upper plate portion 1t of the fixed frame 1 and the upper wall portion 10t of the cross member 10 having an inverted U-shaped cross section can be effectively used, the lashing member M and the lashing member mounting portion A part of the connecting means between 21 (the above-described nut 42 or bolt head 41a) can be easily deployed, and the degree of freedom in designing the securing member M is also increased.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment, A various design change is possible in the range which does not deviate from the summary.

  For example, in the above embodiment, the cross member 10 is constituted by a hollow pipe having a rectangular cross section, but the cross member 10 may be constituted by a round pipe having a circular cross section. Further, the cross member 10 may be formed of a solid member. In this case, the hydraulic pressure supply unit U is installed at a proper position on the vehicle body frame F outside the cross member 10.

  In the above embodiment, the lashing member M is detachably coupled to the fixed frame 1 with bolts 41 and nuts 42. However, the lashing member M may be welded to the fixed frame 1. Moreover, although the securing member M of the said embodiment is welded to the vehicle body frame F, you may couple | bond with the vehicle body frame F so that attachment or detachment is possible with a volt | bolt and a nut.

A: Cargo stand lifting device Ab ... Mounting base Cl ... Lift cylinder E ... Ground F ... Body frame (vehicle body)
M: Locking member L: Parallel link mechanism S: Space T ... Loading platform 1 ... Fixed frame (mounting member)
1f, 1r; 1t ··· Side plates before and after the fixed frame (mounting member); Upper plate 10 ··· Cross members 10f and 10r; 10t · · · Side walls before and after the cross member; Bumper 21 ··· lashing member mounting portion 22 ··· parallel link mounting portion 23 ··· bumper mounting portion 41 ··· bolt 41a ... bolt head 42 ··· nut

Claims (2)

A load receiving platform lifting and lowering device (A) for raising and lowering a load receiving platform (T) on which a load can be placed so that it can be used for loading and unloading loads between the ground (E) and an on-board load box (N) is provided. In a vehicle with a cargo receiving platform lifting device having an attachment base (Ab) for mounting the platform lifting device (A) to the vehicle body (F),
The load receiving table elevating device (A) has a left and right parallel link mechanism (L) that guides and supports the load receiving table (T) so that it can be moved up and down, and a driving force that swings the left and right parallel link mechanism (L) upward. With left and right lift cylinders (Cl)
The mounting base (Ab) includes a cross member (10) extending in the vehicle width direction, and left and right mounting members (1) fixed to the outer surface of the cross member (10) at a distance from each other.
Each of the attachment members (1) includes a lashing member attachment portion (21) to which a lashing member (M) for tying the attachment member (1) to the vehicle body (F) is attached, and the parallel link mechanism (L ) Are attached to the parallel link attachment portion (22), and the bumper attachment portion (23) is attached to the bumper attachment portion (23).
The cross member (10) is supported by a vehicle body (F) via the left and right attachment members (1) and the securing members (M), and a vehicle with a load receiving platform lifting device. The cross member (10) is formed in a square pipe shape with a pair of side walls (10f, 10r) facing the vehicle front-rear direction,
Each of the mounting members (1) has a front and rear side plate portions (1f, 1r) and an upper plate portion (1t) integrally connecting the upper ends of both side plate portions (1f, 1r). In addition to being formed in an inverted U shape, the front and rear side plate portions (1f, 1r) are respectively fixed to the front and rear side walls (10f, 10r) of the cross member (10),
A space (S) is defined between the upper plate portion (1t) and the upper wall (10t) of the cross member (10), and the securing member (M) is defined in the space (S). The nut (42) or the bolt head (41a) of the bolts (41) and nuts (42) that connect between the lashing member attaching part (21) and the bolt head (41a) is housed. A vehicle with a cargo receiving platform lifting device described in 1.

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