JP2959140B2 - Hub bolt press-in device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hub bolt press-fitting device, and more particularly to an equalizing mechanism.

[0002]

2. Description of the Related Art A disc wheel of a wheel is mounted and fixed to a hub fixed to an axle via a plurality of hub bolts. The hub bolt has a serration formed at a base end thereof. It is press-fitted into a drilled bolt hole and is firmly fixed to the hub by a serration so that it cannot rotate. When a hub bolt is press-fitted into a hub, all hub bolts are press-fitted at once by a hub bolt press-in device.

FIG. 6 schematically shows a conventional hub bolt press-fitting device.
And a press-fitting head 4 mounted on the tip of the rod 3 of the hydraulic cylinder 2. The press-fitting head 4 is configured, for example, according to the number of hub bolts into which the hole 4 a is to be press-fitted. Four are drilled,
A push rod 5 is slidably and liquid-tightly fitted in each of the holes 4a, and a liquid chamber 4b formed between the end face of each hole 4a and the end face of each push rod 5 is filled with oil. Have been. These liquid chambers 4b are mutually connected by an oil passage 4c, and the oil in each liquid chamber 4c can move between the liquid chambers. Also, the open end 4 of the oil passage 4c
A check valve 6 is provided at d. The holes 4a and the push rods 5 of the press-fit head 4 are arranged at equal intervals on the same circumference corresponding to the hub bolts.
They are drawn side by side for clarity.

When the hub bolts 8 are press-fitted into the hub 7, after inserting the shaft portions 8a of the hub bolts 8 into the respective bolt holes 7a of the hub 7, the tips of the push rods 5 of the press-fitting head 4 are applied to the respective heads 8b. The hydraulic cylinder 2 is extended to apply a pressing force to the press-fitting head 4, the pressing force is transmitted to each push rod via oil, and these hub bolts 8 are simultaneously and evenly pressed to cause serrations 8 c. Press into the base end.

[0005]

However, since the conventional hub bolt press-fitting device is constituted by a hydraulic equalizing mechanism, oil in the liquid chamber 4b of the pressure head 4 leaks inevitably. For this reason, at the time of use or during use, it is necessary to check the state of the oil in the liquid chamber from time to time and replenish the oil only for the leaked amount, which is not only troublesome, but also has poor workability.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a hub bolt press-fitting device in which an equalizing mechanism is mechanically configured to eliminate oil leakage and to simplify the structure. And

[0007]

According to the present invention, in order to achieve the above object, a cylinder is provided on a press-fitting head of an equalizing mechanism at predetermined intervals on the same circumference so as to be slidable in the axial direction. In the hub bolt press-fitting device which presses the four push rods simultaneously and evenly and press-fits the four hub bolts into the bolt holes of the hub, the equalizing mechanism is provided with both ends each being adjacent to the four push rods. The first mounted on each upper end of two push rods
, Two first push rods each having a lower end placed at the center of each of the first rocker bars, and two ends of each of the second push rods at both ends. The cylinder is mounted on the upper end, and the tip of the rod of the cylinder is brought into contact with the center of the upper surface.
And a second rocking bar for simultaneously and evenly pressing the four push rods via the rocking bar.

[0008]

The center of the upper surface of the second oscillating bar is pressed by the rod of the cylinder, and the second two push rods are pressed by both ends of the oscillating bar. Each of these push rods presses the center of each of the upper surfaces of the first two swing bars. Each end of these rocking bars presses two adjacent push rods of the first four, respectively. These four push rods press the hub bolts inserted into the bolt holes of the hub simultaneously and evenly to completely press-fit the hub bolts to the base end of the serrations.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 4, the equalizing mechanism 10 of the hub bolt press-in device includes a press-in head 11, first four push rods 12 to 15, first two rocking bars 16, 17, and a second Two push rods 18,
19 and a second single swing bar 20. At the lower end of the press-fitting head 11, holes 11a to 11d (FIG. 3) are formed at equal intervals on the same circumference and are parallel to the axial direction. At the center, the lower ends have adjacent holes among these holes 11a to 11d, for example. Square holes 11e and 11f (FIGS. 1 and 3) opening at the upper ends of the holes 11a and 11b, 11c and 11d, and a hole 1 opening at the lower end in the center of the upper end of each of the holes 11e and 11f.
1g, 11h (FIG. 1), the lower end is a hole 11g, 1h.
Square holes 11i (FIG. 1) opening at the upper end of 1h are formed in the respective axial directions.

Each of the push rods 12 to 15 is reduced in diameter with a slight step from the center to the lower part, and has a notch 12a on one side of each upper end for preventing interference with the swing bars 16 and 17, respectively. To 15a. The push rods 12 to 15 each have an upper large-diameter portion having a bush 2.
1 are slidably fitted in holes 11a to 11d of the press-fitting head 11 in the axial direction.
The upper part of 3 has push rods 1 on both sides in square hole 11e.
The upper portions of 4 and 15 protrude on both sides in the square hole 11f.

Each of the holes 11a to 11
Spring holders 22 (FIGS. 1 and 2) are provided at the lower ends of d, respectively.
Each of the spring holders 22 accommodates a spring 23 for pushing the push rods 12 to 15 upward. That is, one spring 23 is
The lower portion of the push rod 12 is loosely inserted and is contracted between the end surface of the spring holder 22 and the step surface of the push rod 12 to push the push rod 12 upward. Similarly, each of the springs 23 of the other push rods 13 to 15 has these push rods 1.
3 to 15 are pushed upward.

The swing bar 16 is housed in the square hole 11e, and both ends of the lower surface are placed on the upper ends of the push rods 12, 13 (FIG. 2), and the central portion 16a is connected to the upper ends of the push rods 12, 13. Each notch 12 to avoid interference
a, bulging into a substantially semicircular shape in opposition to 13a,
A square hole 16b is formed substantially at the center of the upper surface. The swing bar 16 has both side surfaces slidably in contact with both sides of the square hole 11e, and the upper surface thereof is swingable against the upper surface of the square hole 11e with a slight gap. Similarly, the swing bar 17 is housed in the square hole 11f, and both ends thereof are mounted on the upper ends of the push rods 14 and 15 so as to be swingable.

The push rods 18 and 19 are slidably fitted in the holes 11g and 11h of the press-fitting head 11 through bushings 24 in the axial direction, respectively. 17 are fitted in the respective square holes 16b, 17b, and notches 18a, 19a (FIGS. 1, 3) are provided on one side of the upper end. These push rods 18,
The upper part of 19 protrudes on both sides inside the square hole 11i.

The swing bar 20 is formed in the same manner as the swing bar 16 and is housed in the uppermost square hole 11i of the press-fit head 11, and both ends of the lower surface are placed on the upper ends of the push rods 18 and 19. And the center part 20a is the push rod 1
To avoid interference with the upper ends of 8, 19, each notch 18a,
It is formed to bulge into a substantially semicircular shape in opposition to 19a, and a square hole 20b is formed substantially at the center of the upper surface. The swing bar 20 has both side surfaces slidably in contact with both sides of the square hole 11i, and the upper surface thereof can swing with a slight gap facing the upper end of the square hole 11i.

As shown in FIGS. 1 and 2, the press-fitting head 11 is screwed to a cylinder head of a hydraulic cylinder 26 via a bracket 25, and the tip of a rod 27 of the cylinder 26 is chamfered on both sides. The swing bar 20 is fitted in a square hole 20b on the upper surface. That is, as shown in FIG. 5, both ends of the swing bars 16 and 17 are placed on the upper ends of the push rods 12 and 13 and 14 and 15 respectively. Holes 16b, 17b
The lower ends of the push rods 18 and 19 are fitted therein, and both ends of the oscillating bar 20 are mounted on the upper ends of the oscillating bars 18 and 19, respectively.
The tip of the rod 27 of the hydraulic cylinder 26 is fitted therein.

The lower surfaces 16a, 17a and 20a of the swinging bars 16, 17 and 20 are bulged downward,
At the center of the upper surface corresponding to these bulging portions, square holes 16b, 1
By drilling 7b and 20b and fitting the lower surfaces of the push rods 18 and 19 and the tip of the rod 27, the overall height of the press-fit head 11 when the swing mechanism is configured in two stages can be reduced. I have to.

The operation will be described below. In FIGS. 1 and 2, after the hub 7 is mounted on a mounting table (not shown), the shaft portions 8a of the hub bolts 8 are fitted into the four bolt holes 7a (only two are shown) up to the tip end of the serration 8c. After inserting
Hub bolts 8 corresponding to the lower end faces of the push rods 12 to 15 of the equalizing mechanism 10 of the hub bolt press-fitting device.
To the upper surface of the head 8b.

Next, the rod 27 is extended by driving the hydraulic cylinder 26 to press the center of the upper surface of the swing bar 20. When the center of the swing bar 20 is pressed, both ends thereof simultaneously and uniformly press the two push rods 18 and 19, and simultaneously and uniformly press the center of the upper surfaces of the swing bars 16 and 17. The swing bar 16 has push rods 12 and 13 at both ends when the center of the upper surface is pressed, and the push bar 14 and 15 has push rods 14 and 15 at both ends when the center of the upper surface is pressed. Press simultaneously and evenly.
As a result, the four push rods 12 to 15 are simultaneously and evenly pressed against the spring force of the spring 23 to press the respective hub bolts 8 and press-fit the respective bolt holes 7a to the base ends of the serrations 8c.

If, for example, three of the four hub bolts are press-fitted at the same time, and the press-fitting of the remaining one hub bolt is slightly delayed, the three press-fitted ones of the three hub bolts are completed first. The pressing force of the cylinder 26 applied to the push rod of the hub bolt is applied to the push rod of the hub bolt that has not yet been press-fitted, and presses the hub bolt.

For example, if the completion of the press-fitting of the hub bolt 8 corresponding to the push rod 12 is later than the completion of the press-fitting of the other three hub bolts 8, the push rod 12 becomes the push rod 13 of the hub bolt 8 for which the press-fitting is completed. The oscillating bar 16 oscillating about the fulcrum is pressed by the oscillating bar 20 oscillating about the push rod 19 via the push rod 18. Thereby, the push rod 12 can completely press-fit the corresponding hub bolt 8.

As described above, the push rods 12 to 1
5 completes press-fitting of the hub bolt 8, the hydraulic cylinder 2
6. Release the pressing force to retract the rod 27. Rod 2
With the retraction of 7, each spring 23 pushes up the push rods 12 to 15, the swing bars 16, 17, the push rods 18, 19, and the swing bar 20 by the spring force and returns to the original position.

[0022]

As described above, according to the present invention, four pushers are provided on the press-fitting head of the equalizing mechanism at predetermined intervals and slidably in the axial direction on the same circumference by the cylinder. In a hub bolt press-fitting device for pressing four rods simultaneously and evenly and press-fitting four hub bolts into a bolt hole of a hub, the equalizing mechanism may be configured such that each end of each of the two push rods is adjacent to the four push rods. First two swing bars mounted on each upper end,
A first two push rods each having a lower end placed at the center of each of the first rocking bars; and two ends mounted at each upper end of each of the second push rods, and A second swinging bar which abuts a tip of a rod of a cylinder and simultaneously and uniformly presses the four push rods via the second pushing rod and the first swinging bar when the cylinder is extended; With this configuration, the equalizing mechanism can be completely mechanically and simply configured, oil leakage and the like can be completely eliminated, and it is extremely easy to use, and the workability of press-fitting the hub bolt can be improved. Has an excellent effect.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an equalizing mechanism of a hub bolt press-fitting device according to the present invention.

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

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

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1;

FIG. 5 is a plan view showing a positional relationship between each push rod and each swing bar in FIG. 1;

FIG. 6 is a schematic configuration diagram of a conventional hub bolt press-fitting device.

[Explanation of symbols]

 Reference Signs List 7 hub 8 hub bolt 10 equalizing mechanism 11 press-fit head 12-15, 181, 19 push rod 16, 17, 20 swing bar 22 spring holder 23 spring 26 hydraulic cylinder 27 rod

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-164526 (JP, A) JP-A-7-81743 (JP, A) JP-A-63-35531 (JP, U) (58) Survey Field (Int.Cl. ⁶ , DB name) B23P 19/02 B25B 27/08

Claims (1)

(57) [Claims] 1. A cylinder is used to simultaneously and evenly press four push rods arranged at predetermined intervals and axially slidably on the same circumference of a press-fitting head of an equalizing mechanism to uniformly and uniformly press the hub. In a hub bolt press-fitting device for press-fitting four hub bolts into bolt holes, the first and second equalizing mechanisms are mounted on first upper ends of two push rods adjacent to the four push rods.
Swing bars, two first push rods each having a lower end placed at the center of each of the first swing bars, and both ends at the upper ends of the second push rods. The tip of the rod of the cylinder is placed in contact with the center of the upper surface, and when the cylinder is extended, the four push rods are simultaneously and uniformly pressed via the second push rod and the first swing bar. And a second swinging bar.