JP3467819B2 - Transmission operation device for transmission in industrial vehicle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to industrial vehicles such as forklifts and shovel loaders, and more particularly to a transmission gear shift device for remotely operating a transmission that is floatingly supported by a body frame by a shift lever attached to the body frame. .

[0002]

2. Description of the Related Art In an industrial vehicle, in order to prevent engine vibration from being directly transmitted to a vehicle body frame, a floating system is employed in which the engine is supported together with the transmission on the vehicle body frame through an elastic body. Further, the shift lever of the transmission can be remotely operated by operating the shift lever, so that the shift lever and the shift lever are linked to each other via an interlocking rod and an arm member. Since the transmission is floatingly supported together with the engine on the body frame as described above, there is a drawback that the transmission is displaced by the inertial force when a shock is applied to the body frame, and the displacement amount influences the link joint portion to cause the shift slippage. there were.

[0003] Therefore, the applicant is the actual Kaihei 1-149822
As described in Japanese Patent Laid-Open Publication No. 2004-242242, a measure for preventing shift slippage of the shift operating device shown in FIG. That is, while the shift lever 5 is pivotally attached to the vehicle body frame 1, the transmission 2 is floatingly supported by the elastic body 4.4.
An arm member 6 is rotatably pivotally attached to the gear, and a base end portion of the shift lever 5 and one end portion of the arm member 6 are linked by an interlocking rod 7, and the other end portion of the arm member 6 is connected to a shift lever. 8, the shift lever 5 and the arm member 6
By connecting the respective pivotally connecting parts of the vehicle body with the tension rods 9 via ball joints, the body frame 1
By restraining the displacement of the transmission 2 with respect to the shift lever attachment part, the temporary achievement of prevention of shift omission was achieved.

[0004]

Although the adoption of the tension rod reduces the mutual displacement between the transmission and the shift lever, the vibration of the engine is transmitted directly to the vehicle body frame through the tension rod to give an unpleasant feeling. Therefore, the effect of the floating mechanism will be halved. Therefore, it is possible to increase the play of the ball joint, which is the conventional tension rod connecting part, to increase the amount of displacement absorption, but there is a risk that the bearing accuracy will deteriorate and the ball will fall out, and it will fall in all directions. When assembling so as to have uniform play, the position of the floating-supported transmission is unstable, which makes it difficult to adjust the length of the tension rod, and a high technique is required for the assembling.

[0005]

SUMMARY OF THE INVENTION According to the present invention, the absorption rate of the displacement at the connecting portion of the tension rod is increased to reduce the propagation of vibration, and the length of the tension rod can be easily adjusted to achieve a highly accurate connecting operation. In the structure, a spherical bearing is attached to the connecting end of the tension rod, while a supporting rod is provided on the connected portion in a direction orthogonal to the axial direction of the tension rod. A structure in which a support rod is inserted into the spherical bearing, and a retaining member is attached to the protruding tip of the support rod to connect the support rod, and the tip end of the support rod is radially fitted to the spherical bearing. An introduction portion having a small tolerance is coaxially provided, and a loose fitting portion having a large radial and axial fitting tolerance with respect to the spherical bearing is provided on the base end side of the introduction portion to support the same. B Inserting the de from the introduction part to the spherical bearing is to the spherical surface bearing loosely fitted to the position at which the loosely fitted portion coaxially. In the present invention, the transmission is a general term that includes both a manual transmission and an automatic transmission.

[0006]

A play is ensured in the connecting portion of the tension rod in the speed change operation device with respect to the diameter and the axial direction of the support rod, and the vibration is absorbed by the play. Further, in the case of coupling, if the length of the tension rod is adjusted so that the spherical bearing and the introduction portion are matched, the spherical bearing has an ideal positional relationship with the loose fitting portion when loosely fitted.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A transmission gear shift operation device according to the present invention will be described with reference to the accompanying drawings. An engine 3 in which a transmission 2 is integrally assembled is floatingly supported on a body frame 1 via elastic bodies 4.4, and a structure in which vibration of the engine 3 is less likely to propagate to the body frame 1 is adopted. ing. On the part of the body frame 1 away from the engine mounting position,
A shift lever 5 is rotatably pivotally mounted, while an arm member 6 is attached to the transmission 2 via a bracket 2a.
Is rotatably pivoted, and one end of the arm member 6 and the base end of the shift lever 5 are linked by an interlocking rod 7. The other end of the arm member 6 is connected to the speed change lever 8, and the speed change lever 8 is remotely operated by rotating the shift lever 5. Further, a bracket 2b formed integrally with the transmission 2 and a pivotally-attached portion of the shift lever 5 are connected by a tension rod 9.

Next, the connecting portion of the tension rod 9 will be described. First, on the vehicle body frame 1 side, as shown in FIG. 2, a shift lever 5 is attached to a pivot shaft 10 screwed and fixed to the vehicle body frame 1, and tension rods 9 are spherical surfaces attached to both ends thereof. One of the bearings 11.11 is fitted to the pivot shaft 10, and a nut member 12 is screwed onto the tip end of the pivot shaft 10 to connect them. A spacer 1 is provided on each adjacent surface of the vehicle body frame 1, the shift lever 5, and the spherical bearing 11.
It is considered that the shift lever 5 can be smoothly rotated by interposing 3.13, and the spherical bearing 11 is set to have a small fitting tolerance with respect to the pivot shaft 10.

On the other hand, the coupling portion on the transmission side is supported by inserting the support rod 14 into the bracket 2b which is the coupled portion in a direction orthogonal to the axial direction of the tension rod 9 coupled to the pivot shaft 10. The rear end portion is fixed to the other end surface side in a state where the tip end of the rod 14 is projected to the one end surface side. The fixing means employed here is such that the fixing tongue piece 14 a is projected at the rear end portion of the supporting rod 14 in a direction orthogonal to the axis of the supporting rod 14, and the fixing tongue piece 14 a is formed.
The tip of a is bolted to the bracket 2b. A loose fitting portion 15 having a small diameter with respect to the inner circumference of the spherical bearing 11 and long in the axial direction is formed on the projecting portion of the support rod 14, and the tip of the loose fitting portion 15 has the other end of the tension rod 9 at its other end. The introduction portion 16 having a small fitting tolerance is coaxially integrally formed with the spherical bearing 11 attached to the. Further, at the center of the front end surface of the introducing portion 16, a screwing portion 17 for mounting a nut with a plate as a retaining member is provided in a protruding manner. Further, a spacer 18a which can be fitted into the introducing portion 16 is provided around the bottom surface of the nut 18 with a plate to be mounted on the screwing portion 17 in a skirt shape, and the spacer 18a is slightly smaller than the length of the introducing portion 16. Is set to long.

In order to connect the tension rod 9 to the projecting portion of the support rod 14, first, the connection side with the pivot shaft 10 is temporarily fixed, and the length of the tension rod 9 is changed to the spherical bearing 11. The inner circumference is adjusted so as to match the introduction portion 16 of the support rod 14, and the loose fitting portion 15 is inserted, and the nut 18 is screwed. As a result, a gap is secured in the connecting portion between the tension rod 9 and the bracket 2b in the radial direction and the axial direction of the loose fitting portion 15. The axial fitting tolerance of these gaps can be adjusted by the length of the spacer 18a. With respect to the radial gap, the spherical bearing 11 and the support rod 14 are coaxially arranged, and a uniform gap is provided over the entire circumference between the outer peripheral surface of the loose fitting portion 15 and the inner peripheral surface of the spherical bearing 11. Must be formed. Generally, such an assembling requires a high technique, but in the present invention, since the introduction portion 16 is provided coaxially with the loose fitting portion 15 , the introduction portion 16 and the inner peripheral surface of the spherical bearing 11 are If the length of the tension rod 9 is adjusted so as to match with each other, as shown in (a) of FIG. 4, if the spherical bearing 11 passes through the introducing portion 16, the spherical bearing 11 becomes as shown in (b) of FIG. As shown, since it is guided to the loose fitting portion 15 at a position coaxial with the loose fitting portion 15, the positioning is easy and fine adjustment after connection is not necessary. In particular, there are many advantages in adjusting the length of the tension rod for a floating-supported and unstable transmission.

In the above-described embodiment, the description has been made of the one in which the pivot shaft having the shift lever pivotally attached to the vehicle body frame and the bracket integrally formed with the transmission are connected by the tension rod. As long as it is in the vicinity of each pivotal portion, the connecting portion does not matter, and one or more can be provided between the pivoting portions in the interlocking rod. Further, the same effect can be expected even if the connecting portion of the tension rod is reversed on the body frame side and the transmission side. Incidentally, the fitting tolerance of the loose fitting portion is preferably about 0.1 to 0.3 mm in general industrial vehicles, and this fitting tolerance is also appropriately changed depending on the distance, the strength of vibration, the amplitude, and the like.

In the present invention, the fixing means of the support rod is not limited to the above-mentioned embodiment, but as shown in FIG.
For example, a flange 19 may be formed at the boundary with the loosely fitted portion, and the flange 19 and the nut 20 screwed to the rear end portion may be tightened. Further, in order to secure the fitting tolerance in the axial direction, not only the spacer integrally formed on the bottom surface of the dish nut but also a separate body from the dish nut, that is, a single spacer may be interposed. Further, the retaining pin 21 can be used as the retaining member, and the spacer can be omitted in this case. The introduction portion is constituted by a disc-shaped or cylindrical member that is separate from the support shaft, and is detachably provided by, for example, screwing means. After the spherical bearing is fitted into the loose fitting portion, the introduction portion is introduced. The member forming the portion may be removed and replaced with the retaining member, and in this case, the introducing portion can be repeatedly used as a jig.

[0013]

According to the present invention, to maintain the effects of the floating mechanism, the connecting portion smell of the tension rod
Since the loose fitting portion having a large fitting tolerance is provided in the axial direction and the radial direction of the support rod, the vibration transmitted through the tension rod is absorbed by the loose fitting portion, and the vibration is prevented from being transmitted to the vehicle body. . Moreover, since the introduction portion having a small fitting tolerance is provided at the tip of the support rod, the length adjustment of the tension rod becomes extremely easy, and high assembly accuracy is assured by simple work.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a gear shift operating device of a transmission according to the present invention.

FIG. 2 is an explanatory diagram showing a connecting portion on a shift lever side.

FIG. 3 is an explanatory diagram showing a transmission-side connecting portion.

FIG. 4 is an explanatory diagram showing a connecting operation and a radial gap in the connecting portion.

FIG. 5 is an explanatory diagram of a modification example.

FIG. 6 is an explanatory diagram of a conventional example.

[Explanation of symbols]

1 ... Body frame, 2 ... Transmission, 2b
..Brackets, 3. Engines, 4. Elastic bodies, 5.
・ Shift lever, 6 ・ ・ Arm member, 7 ・ ・ Interlocking rod, 8
..Speed change levers, 9..Tension rods, 10..Pivot shafts, 11..Spherical bearings, 12..Nut members, 13
..Spacers, 14..Supporting rods, 14a..Fixing tongues, 15..Free fitting parts, 16..Introduction parts, 17..Screwed parts, 18..Disc nuts, 18a..spacers, 19
..Flanges, 20 .., nuts, 21 ..

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-55-152911 (JP, A) SAIKAI HEI 1-149822 (JP, U) SHIKAI 52-122424 (JP, U) SAIKAI HAI 2- 124271 (JP, U) Actual Kaihei 1-164346 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60K 20/00-20/08 F16H 59/00-59/12 G05G 1/00-25/04

Claims (2)

(57) [Claims] 1. A gear shift operation device in which a tension rod connects between a vehicle body frame side to which a shift lever is attached and a transmission side floatingly supported by the vehicle body frame, wherein a spherical surface is provided at a connecting end portion of the tension rod. While attaching the bearing, a supporting rod is projected on the connected portion in a direction orthogonal to the axial direction of the tension rod, the supporting rod is inserted into the spherical bearing, and a retaining member is attached to the protruding end of the supporting rod. A structure in which the introduction portion having a small radial fitting tolerance with respect to the spherical bearing is provided coaxially at the tip end portion of the support rod, and at the base end side of the introduction portion,
A loose fitting portion having a large radial and axial fitting tolerance is provided with respect to the spherical bearing, and a support rod of the loose fitting portion is inserted into the spherical bearing from an introduction portion so that the spherical bearing is coaxial with the loose fitting portion.
A gear shift operation device for a transmission in an industrial vehicle, characterized by being loosely fitted in the position . 2. A threaded portion is projectingly provided on a tip surface of the introduction portion,
The spacer is fitted to the introduction portion, a nut with a plate as a retaining member is screwed to the screwing portion, and a fitting tolerance in the axial direction with respect to the spherical bearing is adjusted via the spacer. Transmission operation device for industrial vehicles in Japan.