JPH0749064Y2 - Shaft end support structure - Google Patents

Description

[Detailed description of the device] [Industrial applications]

 The present invention relates to a shaft end support structure.

[Prior art]

For example, in a truck, as shown in the perspective view of FIG. 4, when the shift lever 01 is shifted in the direction of the black arrow, the shift arm 02, the control rod 03, the shift rods 04, 05, 0
6, The horizontal shaft 08 slightly rotates through the shift arm 07 to shift the gear of the transmission 010, and when the shift lever 01 is selected in the direction of the white arrow, the select arm 02 ', the control rod 03', and the select rod 03 'are selected. The transmission 010 selects gears via the rods 04 ', 05' and 06 '. As shown in the plan view and vertical sectional view of FIG. 5, the control rods 03, 03 'have an inner shaft which is a select shaft whose both ends are axially supported by cross members of the chassis frame through brackets, and an outer shaft which is an outer shaft. It has a double shaft made up of a hollow outer shaft which is an inserted shifting shaft. The shift arms 02 are provided at both ends of the control rod 03, and the select arms 02 'are provided at both ends of the control rod 03', respectively. Here, as shown in the rear view of FIG. 6, the control rod 03 ', that is, the select shaft is conventionally supported at its right end by a bracket 012 via a screw bush 011 in order to support an axial force and a rotational force. With the left end is a cylindrical boss 0
The structure is such that it is pivotally supported by the bracket 014 via 13, but when the actual vehicle is assembled, as shown in the exploded view of FIG. 7, the correct alignment due to the dimensional error of the mounting holes of the support brackets 012 and 014 is caused. Due to the difficulty, a relatively large clearance is provided between the select shaft 03 'and the cylindrical boss 013, and between the select shaft 03' and the screw bush 011 so as not to disturb the rotation. , Relative movement of related members is possible. However, both ends of the select shaft 03 'have a considerable amount of play with respect to the bearing members, and the arm 0
Since it receives a reaction force of 2,02 'and slightly bends to rotate, it is inevitable that the operation feeling of the gear shift lever is deteriorated during the gear shift operation. Further, the work of enclosing the bearing member with grease is troublesome.

[Problems to be solved by the device]

The present invention has been proposed in view of such circumstances, and an object of the present invention is to provide a shaft end support structure that has a small amount of backlash and can easily perform a grease sealing operation.

[Means for Solving the Problems]

Therefore, in the present invention, the ball-shaped large-diameter head projecting from the shaft end through the small-diameter neck and the large-diameter head are coaxially inserted inside the medium-diameter hole opened at one end. A resin mortar-shaped bush in which a spherical large-diameter recessed hole is formed and an axial cut that opens into the intermediate diameter hole is formed in the outer peripheral cylindrical portion, and a cylindrical boss into which the outer peripheral cylindrical portion is inserted, In a shaft end support structure having a center hole inserted into the shaft end portion and the other end attached to the opening end of the tubular boss, the rubber boot is externally fitted to the outer peripheral portion of the opening end of the tubular boss. Abutting the outer peripheral surface of the rubber boot, pressing the other end of the rubber boot against the open end of the tubular boss, and at least a part of the inner peripheral surface of the rubber boot is provided with the medium-diameter hole of the resin-made bush. The rubber boot is fixed to the open end by pressing the end on the side where Characterized in that comprises a circular cover having a substantially L-shaped cross-section that.

[Action]

According to such a configuration, the grease encapsulating portion covers the rubber boot by the annular cover so that the rubber boot is easily and reliably fixed to the opening end of the cylindrical boss, and the axial movement from the shaft to the resin die-shaped bush is attempted. Even if a force to be transmitted is transmitted, the elasticity of the rubber boot relaxes the force that tends to move in the axial direction and is supported by the annular cover, preventing movement in the axial direction and preventing the shift lever from operating. Feeling is greatly improved. Further, the boot can be fitted in the grease enclosing portion and can be easily attached to the open end of the cylindrical boss by the annular cover made of sheet metal.

【Example】

An embodiment in which the present invention is applied to a gear shift control system will be described with reference to the drawings. FIG. 1 is a sectional view, FIG. 2 is a perspective view showing a ball bush of FIG. 1, and FIG. It is explanatory drawing which shows the point. In the above figure, 1 is a cross shaft in which a ball-shaped large-diameter head 3 is machined on both ends via a small-diameter neck 2, and 4 is a cylindrical mortar-shaped ball bush molded as a resin molded product, the inner end of which is shown. A spherical large-diameter concave hole 6 into which the large-diameter head 3 is fitted is formed so as to communicate with the medium-diameter hole 5 that is open to the inside. Axial cuts 7 are arranged in parallel, and a small diameter through hole 8 is opened at the outer end. Reference numeral 9 is a boot in which the inner end opening is externally inserted into the cross shaft 1 and the outer end opening is fitted to the outer peripheral portion of the opening end of the cylindrical boss 013. At the time of assembly, first, the ball bush 4 is fitted into the head portion 3 of the cross shaft 1, and then inserted into the cylindrical boss 013 together with the cross shaft 1. Head 3 of cross shaft 1 and recess 6 of ball bush 4
When the medium-diameter hole 5 is pushed by the head 3 during fitting with
Since they temporarily expand along the cut 7, they can be fitted smoothly, and after the fitting, the medium-diameter hole 5 closes automatically. In this state, the ball bush 4 easily becomes a cylindrical boss. Since the medium diameter hole 5 is not expanded after being inserted and once inserted, the ball bush 4 does not come off from the head 3. In the assembled state, the clearance between the head portion 3 and the recessed hole 6 and the clearance between the ball bush 4 and the cylindrical boss 013 are substantially zero, so that there is no play between them. Since the outer peripheral portion of the ball bush 4 has a cylindrical surface, the processing accuracy is improved, and since it is a resin molded product, it is more accurate than rubber. The ball bush can be made of an oil-containing resin, and in this case, the lubrication of the head, ball bush, and cylindrical boss is further improved. Although the bottom of the ball bush 4 is thin and fragile, the through hole 8 is provided here to remove the fragile portion in advance, so that the thin portion can be prevented from being broken. According to such a structure, the movement in the axial direction is restrained by the bottom end of the ball bush 4 abutting against the bracket 014, the rotation about the axis is free, and the inner shafts respectively move the head 3 respectively. It becomes possible to flexibly bend as a local center. Here, the ball bush 4 is filled with grease in order to prevent intrusion of muddy water and dust from the outside.
Conventionally, as shown in FIG. 3, when enclosing the grease,
The boot 9a is once displaced to the broken line position, the ball bush 4 is filled with grease 10, the sheet metal cover 11a is fitted into the tubular boss 013 by the press-fitting jig 12, and then the outer end of the boot 9a is fixed to the sheet metal cover 11a.
Is fitted into. However, in such a structure, the boot has to be displaced, and the select arm 02 ′ is provided in the vicinity of the axial end of the cross shaft 1 so that the space for displacing the boot is narrow. Moreover, the work is troublesome. Therefore, in order to improve this point, as shown in FIG. 1, after the grease 10 is put in, the boot 9 is pushed in by the press-fitting jig 12 via the annular sheet metal cover 11 having an L-shaped cross section. With such a structure, the press-fitting jig can be easily moved without interference of the select arm, the work of moving the boot is substantially eliminated, and the material cost of the boot is reduced due to the downsizing.

[Effect of device]

In short, according to the present invention, the ball-shaped large-diameter head projecting from the shaft end through the small-diameter neck and the large-diameter head coaxially inserted inside the medium-diameter hole opened at one end. A resin-made bush having a spherical large-diameter recessed hole formed therein and an axial cut that opens into the intermediate-diameter hole in the outer peripheral cylindrical portion,
A shaft end support structure having a cylindrical boss into which the outer peripheral cylindrical portion is inserted, and a rubber boot in which a center hole is externally inserted into the shaft end and the other end is attached to an open end of the cylindrical boss. -Shaped boss is externally fitted to the outer peripheral portion of the opening end and abuts the outer peripheral surface of the rubber boot, presses the other end of the rubber boot to the open end of the tubular boss, and at least a part of the inner peripheral surface of the rubber boot. By providing an annular cover having a substantially L-shaped cross section for fixing the rubber boot to the open end by pressing the end portion of the resin mortar-shaped bush on the side where the medium diameter hole is provided, the grease enclosing work is performed. Can be easily performed, and even if the force to move in the axial direction is transmitted from the shaft to the resin die bush, the elasticity of the rubber boot reduces the force to move in the axial direction. While ring Since the shaft is supported by the bar and is prevented from moving in the axial direction, there is little rattling of the shaft end, the shift lever is operated smoothly and lightly, and the shaft end support structure that supports the shaft end easily is obtained. The device is extremely useful in industry.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view showing the ball bush of FIG. 1, and FIG. 3 is an explanatory view showing a conventional procedure for enclosing grease, and FIG. Is a perspective view showing a known gear control system for a truck, FIG. 5 is a plan view showing a double shaft portion V in FIG. 4 and a longitudinal sectional view thereof, and FIG. 6 is a support structure for an inner shaft in FIG. The rear view shown and FIG. 7 are exploded perspective views of FIG. 1 ... Cross shaft, 2 ... Neck, 3 ... Head, 4 ... Ball bush, 5 ... Medium diameter hole, 6 ... Recessed hole, 7 ... Axial cut, 8 ... Small diameter through hole , 9,9a …… Boots, 10 …… Grease, 11,11
a …… Sheet metal cover, 12 …… Press-fitting jig 02 …… Shift arm, 02 ′ …… Select arm, 03 …… Control rod (shift shaft, outer shaft), 03 ′…
… Control rod (selection shaft, inner shaft), 0
8 …… Small shaft, 010 …… Transmission, 013 ……
Cylindrical boss, 014 …… Bracket

 ─────────────────────────────────────────────────── ───Continued from the front page (56) References Shown 57-77724 (JP, U) Shown 63-156826 (JP, U) Shown 47-24444 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A ball-shaped large-diameter head projecting from a shaft end through a small-diameter neck, and a spherical surface into which the large-diameter head is coaxially inserted inside a medium-diameter hole opened at one end. -Shaped large-diameter recessed hole is formed and a resin-made die bush in which an axial cut that opens to the medium-diameter hole is formed in the outer peripheral cylindrical portion, a cylindrical boss into which the outer peripheral cylindrical portion is fitted, and In a shaft end support structure having a central boot inserted into the shaft end and the other end attached to the opening end of the tubular boss, the rubber boot is externally fitted to the outer periphery of the opening of the tubular boss. It is in contact with the outer peripheral surface, presses the other end of the rubber boot to the open end of the tubular boss, and at least a part of the inner peripheral surface of the rubber boot is provided with the medium-diameter hole of the resin-made bush. L for pressing the rubber boot to the open end by pressing to the end on the side Shaft end supporting structure, characterized in that it comprises a circular cover having a mold section.