JP2017032103A - Grease supply structure of leaf spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grease supply structure of a leaf spring which can surely secure an approach angle of a grease supply device which supplies grease to the leaf spring.SOLUTION: An attachment 28 integrally has a first downstream-side opening end part which is connected to a nut 27, a first upstream-side opening end part, and a first grease supply path which penetrates a clearance between the first downstream-side opening end part and the first upstream-side opening end part while being bent in a substantially L-shape. A grease nipple 29 integrally has a second upstream-side opening end part which is connected to the first upstream-side opening end part, a gun connecting part 35 to which a grease gun 34 can be connected, and a second grease supply path which penetrates a clearance between the second upstream-side opening end part and the gun connecting part 35 while being bent in a substantially-L shape. Grease flowing into the second grease supply path of the grease nipple 29 from the grease gun 34 is supplied to an inside diameter part (grease supply hole) of the nut 27 via the first grease supply path of the attachment 28.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a grease supply structure for a leaf spring mounted on a vehicle.

  Patent Document 1 describes a structure in which a grease supply hole for supplying grease is formed in a spring pin that pivotally supports an end portion of a leaf spring on the chassis frame side.

JP 2004-237754 A

  However, the approach angle of the greasing device (grease gun) with respect to the greasing hole may not be ensured depending on the location of the spring pin and the surrounding layout.

  Then, this invention aims at provision of the grease supply structure of the leaf spring which can ensure reliably the approach angle of the greasing apparatus which supplies grease to a leaf spring.

  In order to achieve the above object, the leaf spring grease supply structure of the present invention is a grease supply structure for supplying grease to the grease supply hole of the grease supply portion on the leaf spring side using a greasing device, and the first connection A tube and a second connecting tube.

  The first connecting pipe includes a first downstream opening end connected to the grease supply unit, a first upstream opening end, and a space between the first downstream opening end and the first upstream opening end. And a first greasing passage which is bent in a substantially L shape at a first predetermined angle and passes therethrough.

  The first connecting pipe includes a second downstream opening end connected to the first upstream opening end, a second upstream opening end to which the greasing device can be connected, and a second downstream opening end. A second greasing passage is formed integrally with the second upstream opening end portion so as to be bent and penetrated in a substantially L shape at a second predetermined angle.

  The grease that has flowed into the second greasing passage from the greasing device is supplied to the grease supply hole via the first greasing passage.

  In the above configuration, the opening direction of the second upstream opening end is appropriately changed by changing one or both of the connection angle of the first connection pipe to the grease supply unit and the connection angle of the second connection pipe to the first connection pipe. Thus, the opening direction of the second upstream opening end can be adjusted over a wide range. Therefore, the approach angle of the greasing device to the second upstream opening end can be set in a suitable direction according to the location of the grease supply section, the surrounding layout, etc., and the approach angle of the greasing device can be reliably set. Can be secured.

  According to the grease supply structure of the leaf spring of the present invention, it is possible to reliably ensure the approach angle of the greasing device that supplies grease to the leaf spring.

It is the external appearance perspective view which looked at the front-end part of the leaf spring which employ | adopted the grease supply structure which concerns on embodiment of this invention from the vehicle width direction outer side. It is the external appearance perspective view which looked at the front-end part of the leaf spring of FIG. 1 from the vehicle width direction inner side. It is the figure which looked at the front-end part of the leaf spring of FIG. 2 from the direction of arrow III. FIG. 4 is a view of the periphery of the inner bearing of FIG. 3 as viewed from the direction of arrow IV. FIG. 4 is a view of the periphery of the inner bearing of FIG. 3 viewed from the direction of an arrow V. FIG. 4 is a view of the periphery of the inner bearing of FIG. 3 as viewed from the direction of arrow VI. FIG. 4 is a view of the periphery of the inner bearing of FIG. 3 as viewed from the direction of arrow VII. It is a side view of a grease nipple. It is the external appearance perspective view which looked at the front-end part of the leaf spring of the state which has supplied grease using the grease gun from the vehicle width direction outer side.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the figure, the arrow FR indicates the front of the vehicle 1, UP indicates the upper side, and IN indicates the inner side in the vehicle width direction. In the following description, the front-rear direction means the front-rear direction of the vehicle 1, and the left-right direction means the left-right direction with the vehicle 1 facing forward.

  A vehicle 1 according to this embodiment shown in FIGS. 1 and 2 is a low-floor truck, and a spring mounting structure 2 is provided at the front portion of the vehicle 1. The spring mounting structure 2 is provided symmetrically on the left and right of the vehicle 1, and each supports the left and right leaf springs 3. Since the left and right spring mounting structures 2 have substantially the same configuration, the right side will be described below and the left side description will be omitted.

  The vehicle 1 includes a pair of left and right side members 4 as a body frame, a cross member (not shown), and the like. The side members 4 extend in the front-rear direction on both sides in the vehicle width direction, and the front end portions of the left and right side members 4 are connected by cross members. Each side member 4 has a U-shaped cross section that opens to the inner side in the vehicle width direction. The side member 4 has a side member side plate portion 5 that stands substantially vertically and extends in the front-rear direction, and an upper edge and a lower end edge of the side member side plate portion 5. A side member upper plate portion 6 and a side member lower plate portion 7 which are bent inward in the width direction and face each other are integrally provided.

  The spring mounting structure 2 includes a spring bracket 8 fixed to the side member 4, a reinforcing plate 9 that reinforces the spring bracket 8, and the like.

  The spring bracket 8 is provided on each of the left and right sides. Each spring bracket 8 extends in the front-rear direction below the front side of the side member 4 and is fastened to the lower side of the side member lower plate portion 7 by a plurality of bolts 10 and nuts 11 screwed into the bolts 10 from below. Fixed. The plurality of bolts 10 are arranged in the front-rear direction. The spring bracket 8 has a U-shaped cross section that opens to the lower side, and extends to the front and rear so as to be parallel to the side member lower plate portion 7, and the left end edge and the right end of the spring bracket upper plate portion 12. A spring bracket inner plate portion 13 and a spring bracket outer plate portion 14 that are bent downward from the edge and opposed to each other are integrally provided.

  The reinforcing plates 9 are provided on the left and right, respectively. Each reinforcing plate 9 has a plurality of bolts 15 and nuts (not shown) screwed into the bolts 15 from the inner side in the vehicle width direction so as to stand substantially vertically on the outer side in the vehicle width direction of the side member 4 and the spring bracket 8. Thus, the side member side plate portion 5 is fastened and fixed to the outside in the vehicle width direction. The reinforcing plate 9 includes a fastening and fixing portion 16 that is fastened and fixed to the side member side plate portion 5, a reinforcing portion 17 that covers a part of the spring bracket outer plate portion 14 on the outer side in the vehicle width direction, and a fastening and fixing portion 16 and a reinforcing portion 17. And a projecting portion 18 projecting outward in the vehicle width direction. The plurality of bolts 15 are arranged at six locations, that is, two locations on the fastening and fixing portion 16 on the front side of the protruding portion 18 and four locations on the fastening and fixing portion 16 on the rear side of the protruding portion 18.

  The leaf springs 3 are provided on the left and right, respectively. Each leaf spring 3 has a configuration in which a plurality of long plates having different lengths are stacked one above the other, and extends in the front-rear direction below the side member 4 with a space from the side member 4. Be placed. A cylindrical eyeball portion 19 is bent at the front end of the leaf spring 3, and the eyeball portion 19 is disposed between the spring bracket inner plate portion 13 and the spring bracket outer plate portion 14. An inner bearing 20 is fixed to the spring bracket inner plate portion 13, an outer bearing 21 is fixed to the spring bracket outer plate portion 14, and the eyeball portion 19 is bridged between the inner bearing 20 and the outer bearing 21. The spring pin 22 is attached to the spring bracket 8.

  The inner bearing 20 has a C-shaped cross-sectional shape in which a bearing hole (not shown) penetrating in the axial direction (vehicle width direction) of the spring pin 22 and a slit 23 opening downward from the bearing hole are formed. A bolt hole (not shown) penetrating in the front-rear direction perpendicular to the axial direction of the spring pin 22 is formed in the lower portion of the inner bearing 20. After one end of the spring pin 22 is inserted into the bearing hole of the inner bearing 20, a bolt 25 inserted into the bolt hole of the inner bearing 20 from the rear, and a nut 26 screwed into the bolt 25 from the front are used. A spring pin 22 is fastened and fixed to 20.

  A nut (grease supply unit) 27 serving as a base is fixed to the outer side of the inner bearing 20 in the vehicle width direction so as to be substantially coaxial with the bearing hole. A grease nipple 29 is connected to the nut 27 via an attachment 28, and an inner diameter portion (female screw portion) of the nut 27 has a grease supply hole 40 (FIG. 6) for supplying grease to the eyeball portion 19 of the leaf spring 3. Reference).

  As shown in FIGS. 3 to 7 (particularly FIG. 6), the attachment 28 is a connection pipe (first connection pipe) that bends in a substantially L shape as a whole, and has a cylindrical male screw portion (first downstream opening). (End part) 41 and the elbow part 30 which continues to the external thread part 41 are integrated. The male thread portion 41 is screwed into and connected to the inner diameter portion (grease supply hole 40) of the nut 27, and the grease nipple 29 is connected to the distal end portion (first upstream opening end portion) 42 of the elbow portion 30. A female screw portion 43 is formed. Between the opening end of the male screw portion 41 and the opening end of the distal end portion 42 of the elbow portion 30, a first supply that bends in a substantially L shape at approximately 90 degrees (first predetermined angle) and penetrates the attachment 28. A fat passage 44 is formed. When the first greasing path 44 is bent, the distal end portion 42 of the attachment 28 faces in a direction rotated approximately 45 degrees rearward from the vertically lower side (see FIG. 3).

  As shown in FIGS. 3 to 8 (particularly FIG. 8), the grease nipple 29 is a connection pipe (second connection pipe) that is bent in an L shape as a whole, and has a cylindrical male screw portion (second downstream opening). (End part) 31, the head part 32 which continues to the external thread part 31, and the elbow part 33 which continues to the head part 32 are integrated. The male screw portion 31 is screwed and connected to the female screw portion 43 (see FIG. 6) of the attachment 28. The head portion 32 functions as an engaging portion with a tightening tool when the male screw portion 31 is screwed into the female screw portion 42 and tightened. A gun connecting portion (second upstream opening end portion) 35 to which a grease outflow portion 37 (see FIG. 2) of a grease gun (greasing device) 34 is detachably connected is provided at the tip of the elbow portion 33. Between the opening end of the male screw portion 31 and the opening end of the gun connection portion 35, a second feed that bends in a substantially L shape at approximately 67.5 degrees (second predetermined angle) and penetrates through the grease nipple 29. An oil passage 36 is formed. When the first greasing path 44 (see FIG. 6) is bent and the second greasing path 36 is bent, the gun connecting portion 35 faces forward and downward and outward in the vehicle width direction (see FIG. 5).

  The grease flowing into the gun connecting portion 35 from the grease outflow portion 37 passes through the second grease supply passage 36 of the grease nipple 29 and the first grease supply passage 44 of the attachment 28 to the grease supply hole 40 on the leaf spring 3 side. Supplied.

  According to this embodiment, one or both of the connection angle (rotation position) of the attachment 28 to the nut 27 (grease supply hole 40) on the leaf suspension 3 side and the connection angle (rotation position) of the grease nipple 29 to the attachment 28 are determined. By appropriately changing, the opening direction of the gun connection part 35 can be adjusted and set, so that the opening direction of the gun connection part 35 can be adjusted over a wide range. Therefore, as shown in FIGS. 2 and 9, the approach angle of the grease gun 34 (grease outflow portion 37) to the gun connection portion 35 is set in a suitable direction according to the location of the nut 27, the surrounding layout, and the like. Thus, the approach angle of the grease gun 34 can be reliably ensured.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the discussion and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  For example, in the above-described embodiment, the bending angle of the first greasing passage 44 in the attachment 28 is approximately 90 degrees, and the bending angle of the second greasing passage 36 in the grease nipple 29 is approximately 67.5 degrees. These angles can be set arbitrarily.

  The leaf spring grease supply structure according to the present invention can be used for trucks and other vehicles.

3 Leaf spring 27 Nut (grease supply part)
28 Attachment (first connecting pipe)
29 Grease nipple (second connecting pipe)
31 Grease nipple male thread (second downstream opening end)
34 Grease gun (greasing device)
35 Gun nipple gun connection (second upstream opening end)
36 Second greasing passage 40 Grease supply hole 41 Male thread portion of attachment (first downstream opening end)
42 Tip of attachment (first upstream opening end)
44 First greasing path

Claims (1)

A grease supply structure for supplying grease to the grease supply hole of the grease supply part on the leaf spring side using a greasing device,
A first predetermined distance between the first downstream opening end connected to the grease supply section, the first upstream opening end, and the first downstream opening end and the first upstream opening end is provided. A first connecting pipe integrally having a first greasing passage that bends and penetrates substantially in an L shape at an angle;
A second downstream opening end connected to the first upstream opening end, a second upstream opening end connectable to the greasing device, the second downstream opening end, and the second. A second connecting pipe integrally having a second greasing passage that is bent in a substantially L shape at a second predetermined angle and penetrated between the upstream opening end portion, and
A grease supply structure for a leaf spring, wherein the grease that has flowed into the second grease supply path from the grease supply apparatus is supplied to the grease supply hole via the first grease supply path.

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