JP2566583Y2 - Center hinge pin device of vehicle body refraction type vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a vehicle center hinge pin device provided with a vehicle body revolving turning mechanism such as a wheel loader.

(Prior Art) FIG. 6 shows the appearance of a wheel loader of a vehicle body refraction type.

In the drawing, a front vehicle body F and a rear vehicle body R are mutually refracted about a center hinge pin center line CC, so that the vehicle body turns.

A conventional center hinge pin device is shown in FIGS. 4 and 5 as sectional views taken along the center hinge pin center line.

 FIG. 4 shows a single pin type.

That is, the front frame f and the shaft S provided on the rear frame r are connected by the center pin p.

Also, as a center hinge pin device for a vehicle equipped with a vehicle body revolving type turning mechanism, Japanese Utility Model Application No. 61-94943 (Japanese Utility Model Application Laid-Open No. 63-977) has been proposed.
The work shown in the microfilm of No. 1 above shows that the front and rear parts of the vehicle body are rotatably connected to each other, a rolling restraining device is provided, and a switching means for the body bending restraining angle is provided. Discloses a center hinge pin device using one pin.

The center hinge pin device disclosed in the microfilm of Japanese Utility Model Application No. 61-94943 (Japanese Utility Model Application Laid-Open No. 63-977) has a longitudinal axis in which the front frame and the rear frame of the vehicle body are fixed to the rear frame. The front and rear bearing portions of the connecting member pivotally supported by the above are loosely fitted and supported on the frame, so that the connecting member is rotatably connected.

These single pin type center hinge pin devices are
Because it has an oscillation function as well as an articulation function, the rear frame on which the driver's seat is mounted swings when riding on uneven road surfaces or obstacles, and the operator swings more and the ride quality is poor. Conventionally, the upper and lower two pin type center hinge pin devices shown in FIG. 5 are generally used as a device for swinging only the rear axle.

That is, the front frame e and the rear frame g are connected by the upper hinge part a and the lower hinge part b.

Here, the center line of the pin c of the upper hinge a and the center line of the pin d of the lower hinge b are arranged on a straight line.

Two tapered roller bearings h, h are provided on the upper hinge part a.
The needle bearings i are arranged on the lower hinge portion b, respectively, so that they are aligned on the back.

JP-A-54-72811 also discloses a two-pin type center hinge device.

It includes a pair of spaced apart pivot connections for pivoting about a horizontal axis and a vertical axis.

Separately from these, as a roller for ropes,
There is No. 9 publication.

This is a one-pin type, which describes a technique for holding a bearing that is spaced apart from the back face, providing a threaded portion on a shaft, and sealing and positioning after lubricating oil is sealed.

(Problem to be Solved by the Invention) The microfilm of Japanese Utility Model Application No. 61-94943 (Japanese Utility Model Application Publication No. 63-977) has a single pin type center hinge pin structure, but has two tapered roller bearings. Since no hinge is used, the load withstands the thrust load at the hinge portion is small, play is likely to occur, and the riding comfort is poor due to vibration during traveling work.

Further, since the taper roller bearing is not used, the greasing interval is short, and the maintainability is not good.

Further, the center hinge pin device of the upper and lower two pin type shown in FIG. 5 has the following problem.

(1) The number of parts is large and the structure is complicated.

(2) Approximately 50 greasing intervals due to the use of needle bearings
0 hours and short.

(3) Since the backlash is generated from two places due to wear, the total amount of backlash increases, and the riding comfort is poor.

In Japanese Patent Application Laid-Open No. 55-11599, two tapered roller bearings are arranged on the back side, and a preload is applied to the bearings as a play preventing means.

However, this backlash preventing means adjusts the clearance for applying a preload by providing a screw portion on the shaft, and the adjustment work is difficult to perform because the nut receiving the screw portion is inserted in the axial direction.

(Means for Solving the Problems) The present invention has been made to solve the above problems.

A single pin type center hinge pin is used to provide only the articulate function, and the oscillation function swings only the rear axle.

That is, in a center hinge pin device of a vehicle body refraction type vehicle that connects a front frame and a rear frame of a vehicle body refraction type vehicle, two taper roller bearings are arranged on the center hinge pin with a space therebetween and are back-to-back. A holding plate and a collar are provided on both shaft end sides, one holding plate is fixed to the front frame or the rear frame, the inner ring of the tapered roller bearing is pressed with the collar, and the other holding plate is axially inserted through the gap adjusting shim. Then, the inner ring of the tapered roller bearing was pushed by the collar to support the load in the thrust direction and the radial direction.

(Operation) In accordance with the interval between the tapered roller bearings, rigidity against thrust and radial loads from the front frame and the rear frame is maintained.

 This interval is appropriately determined according to the vehicle.

By fixing one holding plate to the front frame or rear frame, the position of one tapered roller bearing is determined, and the other holding plate is axially tightened via a gap adjusting shim to form a tapered roller bearing with a collar. The inner ring is pushed, and the force applied from the holding plate becomes the preload applied to both the tapered roller bearings, and this preload is adjusted.

With the adjusted preload, one of the holding plates is fixed to the front frame or the rear frame, so that the pressing plate acts to eliminate backlash.

(Example) Next, an example of this invention is described based on a drawing.

FIG. 1 shows a first embodiment of the center hinge pin device according to the present invention.
FIG. 2 is a sectional view taken along a central axis of the center hinge pin 1 in the embodiment.

It is connected by a center hinge pin 1 and the front frame 2 and the rear frame 3 via a tapered roller bearing 4 _1, 4 ₂ in FIG.

Since the tapered roller bearings 4 ₁ and 4 ₂ are mounted face-to-face, the bearing span is not uniquely determined unlike face-to-face alignment, and the bearing span L is free depending on the magnitude of the load (radial load). , The bearing span L can be made sufficiently long as required for strength.

Reference numeral 5 denotes a shim, and the axial gap is adjusted by the shim 5.

Pressing plates 16 and 10 and collars 6 and 7 are provided on both ends of the tapered roller bearings 4 ₁ and 4 ₂ , and one pressing plate 10 is fixed to the front frame ₂ . By pressing the inner ring, the other holding plate 16 is tightened with the bolt 17 in the axial direction through the gap adjusting shim 5,
Press inner ring of the taper roller bearings 4 ₁ color 6, to support the load in the thrust direction and the radial direction.

Reference numeral 8 denotes a seal provided on the outer surfaces of the collars 6 and 7,
Prevents water, mud, dust, etc. from entering the bearing.

As described above, the collars 6 and 7 are the front frame 2
The load acting on the pin also serves as the boss.

FIG. 2 is a sectional view taken along a central axis of a center hinge pin 21 according to a second embodiment, in which a bolt 27 has a front frame via a shim 25 as compared with the first embodiment shown in FIG. The difference is that the screw 2 and the holding plate 26 are screwed.

 Reference numerals 28 and 29 denote collars, and reference numerals 20 and 26 denote holding plates.

FIG. 3 is a sectional view of the third embodiment, taken along the center axis of the center hinge pin 31. In this embodiment, the adjustment of the axial clearance is performed by the shim 35 and the bolt 38, and the preload of the bearing is adjusted by the bolt 39. Are doing.

 36 and 40 are holding plates, and 41 and 42 are collars.

(Effects of the invention) This invention is as described in detail above, so it is easy to adjust the gap with the bolt and the holding plate, and because it is a single pin type, the number of parts can be reduced and the structure can be simplified,
The use of tapered roller bearings has greatly reduced the cost, and the greasing interval has been extended to about 1000 hours.At the same time, the maintainability has been improved. There is an effect that comfort can be improved.

In the present invention, the preload is adjusted by pressing the inner ring of the bearing in the axial direction through the collar, and the collar also serves as the boss of the front frame and can support the load applied to the pin.

In addition, since a seal is provided on the outer surface of the collar, it is possible to prevent water, mud, dust and the like from entering the bearing.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of the center hinge pin device according to the present invention, FIG. 2 is a sectional view of the second embodiment, FIG. 3 is a sectional view of the third embodiment, and FIG. FIG. 5 is a cross-sectional view of a conventional one-pin type center hinge pin device, FIG. 5 is a cross-sectional view of a conventional two-pin type center hinge pin device, and FIG. 6 is an external side view of a vehicle body refraction type wheel loader. 1,21,31… Center hinge pin 2… Front frame 3… Rear frame 4 ₁ , 4 ₂ … Tapered roller bearing 5,25,35… Shim 6,7,28,29,41,42… Color 10,16,20 , 26,40,36… Retainer plate 17,27,38,39… Bolt

Continuation of the front page (56) References JP-A-54-72811 (JP, A) JP-A-50-20154 (JP, A) JP-A-62-167931 (JP, U) JP-A-63-977 (JP) , U) Japanese Utility Model Showa 58-122017 (JP, U) Japanese Utility Model Showa 62-167930 (JP, U) Japanese Patent Publication 55-11599 (JP, B2) Japanese Utility Model 1-11589 (JP, Y2) 63-42195 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A center hinge pin device for a vehicle body refraction type vehicle connected to a front frame and a rear frame of a vehicle body refraction type vehicle, wherein two taper roller bearings are arranged on the center hinge pin at a distance from each other to face each other. A holding plate and a collar are provided on both shaft end sides of the bearing, one of the holding plates is fixed to the front frame or the rear frame, the inner ring of the tapered roller bearing is pressed with the collar, and the other holding plate is passed through the gap adjustment shim. A center hinge pin device for a vehicle body refraction type vehicle, wherein a collar pushes an inner ring of a tapered roller bearing by axially tightening a bolt to support a load in a thrust direction and a radial direction.