Cab mount

Abstract

To provide a cab mount which restricts relative displacement between an outer cylinder and an inner cylinder in a radial direction when a large load is input without deteriorating vibration control performance.SOLUTION: A cab mount includes: an outer cylinder 11 attached to a vehicle body frame F; an inner cylinder 12 which is inserted into the outer cylinder and attached to a cab C; a body rubber 13 which connects an inner peripheral surface of the outer cylinder with an outer peripheral surface of the inner cylinder; and a restriction member 14 which is attached to an upper end opening edge of the outer cylinder, protrudes to the radial inner side relative to the inner peripheral surface of the outer cylinder, and is provided with a radial gap provided between itself and the outer peripheral surface of the inner cylinder.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cab mount. [Background technology]

[0002] Conventionally, a cab mount has been known that includes an outer tube attached to a vehicle body frame, an inner tube inserted inside the outer tube and attached to the cab, and a main body rubber that connects the inner surface of the outer tube and the outer surface of the inner tube to each other, as shown in Patent Document 1 below, for example. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-175333 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional cab mount, when a large load is input, for example, due to a vehicle collision, and the outer and inner cylinders are displaced significantly relative to each other in the radial direction, this displacement is regulated by a regulating member provided between the outer and inner cylinders, which may result in a reduction in vibration-damping performance during normal driving.

[0005] This invention was made in consideration of these circumstances, and aims to provide a cab mount that can regulate the relative radial displacement between the outer and inner cylinders when a large load is input without reducing vibration-damping performance. [Means for solving the problem]

[0006] In order to solve the above problems and achieve the above object, the cab mount of the present invention comprises an outer tube that is attached to the vehicle body frame, an inner tube that is inserted inside the outer tube and attached to the cab, a main body rubber that connects the inner surface of the outer tube and the outer surface of the inner tube to each other, and a regulating member that is attached to the upper end opening edge of the outer tube and protrudes radially inward from the inner surface of the outer tube, with a radial gap provided between it and the outer surface of the inner tube.

[0007] The regulating member protrudes radially inward from the inner surface of the outer tube and is attached to the upper opening edge of the outer tube with a radial gap between it and the outer surface of the inner tube.This makes it possible to cause the inner tube to collide with the regulating member only when a large load is input, and it is possible to regulate the relative radial displacement of the outer tube and inner tube without reducing the vibration-damping performance during normal driving.

[0008] The restricting member may be provided in a non-adhered state to the main rubber body.

[0009] Since the restricting member is provided in a non-adhered state to the main body rubber, it is possible to prevent the restricting member from inhibiting the elastic deformation of the main body rubber when vibration is input, and the vibration-proofing performance can be exhibited as designed.

[0010] The regulating member may have an inner surface that surrounds the outer surface of the inner tube over the entire circumference, and may be attached to the vehicle so that the gap between the inner surface of the regulating member and the outer surface of the inner tube is narrowest in the fore-and-aft direction of the vehicle.

[0011] Since the regulating member is attached to the vehicle so that the gap between the inner surface of the regulating member and the outer surface of the inner tube is narrowest in the fore-and-aft direction of the vehicle, it is possible to ensure the amount of relative movement between the outer tube (body frame) and the inner tube (cab) in the left-right direction (vehicle width direction), which tends to be relatively large in the radial direction.

[0012] A rib protruding in the vertical direction may be provided on a radially inner end of the restricting member.

[0013] Since the rib protruding in the vertical direction is provided at the radially inner end of the regulating member, the rigidity of the regulating member can be ensured against radial impact forces applied to the regulating member from the inner tube. A fitting cylindrical portion may be fitted into the upper end of the inner cylinder, a fixing bolt may be inserted integrally into the inside of each of the inner cylinder and the fitting cylindrical portion, and the inner diameter of the inner cylinder or the inner diameter of the fitting cylindrical portion may change as it goes up or down. In this case, by changing the inner diameter of the inner cylinder or the inner diameter of the fitting cylindrical portion as it moves upward or downward, the fixing bolt can move the inner cylinder at the required timing. [Effects of the Invention]

[0014] According to this invention, when a large load is applied, the relative radial displacement between the outer cylinder and the inner cylinder can be restricted without reducing vibration isolation performance. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a vertical cross-sectional view of a cab mount shown as a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along the line II-II in FIG. [Figure 3A] 2A to 2C are diagrams illustrating a manufacturing method of the cab mount of FIG. 1. [Figure 3B] 2A to 2C are diagrams illustrating a manufacturing method of the cab mount of FIG. 1. [Figure 3C] 2A to 2C are diagrams illustrating a manufacturing method of the cab mount of FIG. 1. [Figure 3D] 2A to 2C are diagrams illustrating a manufacturing method of the cab mount of FIG. 1. [Figure 4] FIG. 10 is a vertical cross-sectional view of a cab mount shown as a second embodiment. [Figure 5] FIG. 10 is a vertical cross-sectional view of a cab mount shown as a third embodiment. [Figure 6] FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0016] A first embodiment of the cab mount will be described below with reference to FIGS. 1 and 2. FIG. The cab mount 1 includes an outer cylinder 11, an inner cylinder 12, a main body rubber 13, and a restricting member 14. The outer cylinder 11 and the inner cylinder 12 are arranged coaxially with a central axis O extending in the vertical direction. Hereinafter, the direction intersecting the central axis O when viewed from the vertical direction will be referred to as the radial direction, and the direction going around the central axis O will be referred to as the circumferential direction.

[0017] A first flange portion 17 that protrudes radially outward and extends continuously over the entire circumferential length is formed at the upper end of the outer cylinder 11. The outer cylinder 11 is attached to the body frame F via the first flange portion 17. The lower surface of the first flange portion 17 is supported by the body frame F. The inner cylinder 12 is inserted into the outer cylinder 11 and attached to the mounting wall of the cab C. Both vertical end portions of the inner cylinder 12 protrude from the outer cylinder 11 on both sides in the vertical direction.

[0018] A mounting plate 15 is provided at the upper end of the inner cylinder 12. The mounting plate 15 includes a cylindrical fitting portion 15a fitted into the upper end of the inner cylinder 12, and a second flange portion 15b that protrudes radially outward from the upper end of the cylindrical fitting portion 15a and extends continuously over the entire circumferential length. The second flange portion 15b straddles the upper end opening edge of the inner cylinder 12 in the radial direction. The inner cylinder 12 is attached to the mounting wall of the cab C via the second flange portion 15b. The upper surface of the second flange portion 15b is supported by the lower surface of the mounting wall of the cab C. Fixing bolts B are integrally inserted into the inside of the mounting plate 15 and the inner cylinder 12. The mounting plate 15 is not necessarily provided.

[0019] A support plate 16 is provided at the lower end of the inner cylinder 12. The lower open edge of the inner cylinder 12 abuts against the upper surface of the support plate 16. A fixing bolt B passes vertically through the support plate 16 and the mounting wall of the cab C. The fixing bolt B is a headed bolt, and its head is supported on the upper surface of the mounting wall of the cab C, with the lower end of the fixing bolt B protruding downward from the support plate 16. A nut N is threaded onto the lower end of the fixing bolt B, so that the inner cylinder 12 is sandwiched and fixed vertically between the support plate 16 and the mounting wall of the cab C.

[0020] The main body rubber 13 connects the inner peripheral surface of the outer tube 11 and the outer peripheral surface of the inner tube 12 to each other. The main body rubber 13 is vulcanization bonded to the inner peripheral surface of the outer tube 11 and the outer peripheral surface of the inner tube 12. The main body rubber 13 is formed in a cylindrical shape and disposed coaxially with the central axis O. The upper opening edge of the main body rubber 13 is located at the same position as or below the upper surface of the first flange portion 17 in the vertical direction.

[0021] The regulating member 14 protrudes radially inward from the inner surface of the outer tube 11 and is attached to the upper opening edge of the outer tube 11 with a radial gap provided between it and the outer surface of the inner tube 12. The restricting member 14 is formed in a plate shape and is preferably formed from a material having a higher tensile strength than the material from which the outer cylinder 11 is formed.

[0022] The regulating member 14 penetrates the inner tube 12 in the vertical direction. The regulating member 14 has an inner peripheral surface 14a that surrounds the outer peripheral surface of the inner tube 12 over the entire circumference. The inner peripheral surface 14a of the regulating member 14 and the outer peripheral surface of the inner tube 12 each have a circular shape when viewed from the vertical direction. The radial gap between the inner peripheral surface 14a of the regulating member 14 and the outer peripheral surface of the inner tube 12 is constant over the entire circumferential length. The inner peripheral surface 14a of the regulating member 14 is located radially inward from the outer peripheral surface of the second flange portion 15b of the mounting plate 15. The regulating member 14 is provided in a non-adhesive state with respect to the main rubber 13. The lower surface of the regulating member 14 abuts against the upper opening edge of the main rubber 13. Note that the lower surface of the regulating member 14 may be spaced above the upper opening edge of the main rubber 13.

[0023] Here, the first flange portion 17 of the outer tube 11 is provided with locking pieces 18 that fix the restricting member 14 to the upper opening edge of the outer tube 11 and the upper surface of the first flange portion 17. Multiple locking pieces 18 are provided at intervals in the circumferential direction. The locking pieces 18 are formed integrally with the first flange portion 17 and are bent radially inward to cover the upper opening edge of the outer tube 11, thereby sandwiching and fixing the restricting member 14 between the upper opening edge of the outer tube 11 and the upper surface of the first flange portion 17 in the vertical direction. The locking pieces 18 are located below the lower surface of the second flange portion 15b of the mounting plate 15. It is also possible that the locking piece 18 is not provided on the first flange portion 17, and the restricting member 14 is attached to the upper end opening edge of the outer cylinder 11 by, for example, welding or by using a fastening member such as a bolt.

[0024] A method for manufacturing the cab mount 1 configured as above will be described.

[0025] First, as shown in Figures 3A and 3B, unvulcanized rubber is injected using outer tube 11 and inner tube 12 as inserts, and main rubber 13 is vulcanized and molded, thereby vulcanizing and bonding main rubber 13 to the inner surface of outer tube 11 and the outer surface of inner tube 12. At this time, the outer cylinder 11 is provided with a to-be-formed piece 18a of the locking piece 18, and this to-be-formed piece 18a is formed in the shape of a flat plate extending straight upward from the first flange portion 17. Next, as shown in Figures 3C and 3D, while inserting the inner tube 12 into the inside of the regulating member 14 from above the inner tube 12, the regulating member 14 is placed on the upper opening edge of the outer tube 11 and the upper surface of the first flange portion 17, and then the to-be-formed piece 18a of the locking piece 18 is bent radially inward to cover the upper opening edge of the outer tube 11, thereby forming it into the locking piece 18, and the regulating member 14 is sandwiched and fixed in the vertical direction between the locking piece 18 and the upper opening edge of the outer tube 11 and the upper surface of the first flange portion 17. Next, as shown in Figures 1 and 2, the fitting cylindrical portion 15a is fitted into the upper end of the inner tube 12, and the second flange portion 15b is placed on the upper end opening edge of the inner tube 12, thereby attaching the mounting plate 15 to the inner tube 12.

[0026] As described above, according to the cab mount 1 of this embodiment, the regulating member 14 is attached to the upper end opening edge of the outer tube 11 so that it protrudes radially inward from the inner surface of the outer tube 11 and leaves a radial gap between it and the outer surface of the inner tube 12. Therefore, it is possible to make the inner tube 12 collide with the regulating member 14 only when a large load is input, and it is possible to regulate the relative radial displacement of the outer tube 11 and the inner tube 12 without reducing the vibration-damping performance during normal driving.

[0027] Since the regulating member 14 is provided in a non-adhered state to the main body rubber 13, it is possible to prevent the elastic deformation of the main body rubber 13 from being inhibited by the regulating member 14 when vibration is input, and vibration isolation performance can be exhibited as designed.

[0028] Since the mounting plate 15 having the second flange portion 15b is separate from the inner tube 12, when manufacturing the cab mount 1, there is no need to insert the second flange portion 15b into the inside of the regulating member 14, and it is possible to make the diameter of the inner surface 14a of the regulating member 14 smaller than the outer diameter of the second flange portion 15b, thereby reducing the bulkiness of the regulating member 14.

[0029] Next, a cab mount 2 according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, with only the differences being described.

[0030] In this embodiment, a rib 21 that protrudes in the vertical direction is provided at the radially inner end of the restricting member 14. The rib 21 protrudes downward from the peripheral edge of the opening of the inner circumferential surface 14a on the lower surface of the restricting member 14. The rib 21 is formed integrally with the restricting member 14. A recessed portion 22 into which the rib 21 is inserted is formed at the edge of the upper opening of the main body rubber 13. A plurality of the ribs 21 and recessed portions 22 are provided at intervals in the circumferential direction.

[0031] As described above, according to the cab mount 2 of this embodiment, the rib 21 that protrudes in the vertical direction is provided at the radial inner end of the regulating member 14, so that the rigidity of the regulating member 14 against the radial impact force applied to the regulating member 14 from the inner tube 12 can be ensured.

[0032] Next, a cab mount 3 according to a third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, with only the differences being described.

[0033] In this embodiment, a rib 23 that protrudes in the vertical direction is provided on the radially inner end of the restricting member 24. The rib 23 protrudes upward from the peripheral edge of the opening of the inner peripheral surface 24a on the upper surface of the restricting member 24. The rib 23 extends continuously over the entire circumferential length. The rib 23 is formed integrally with the restricting member 24. The restricting member 24 is attached to the body frame F together with the first flange portion 17 of the outer tube 11 by the same bolt.

[0034] The inner peripheral surface 24a of the restricting member 24 has an elliptical shape when viewed from the vertical direction. The inner peripheral surface 24a of the restricting member 24 is disposed coaxially with the central axis O. The outer peripheral surface of the inner cylinder 12 has a circular shape when viewed from the vertical direction. The radial distance between the inner peripheral surface 24a of the restricting member 24 and the outer peripheral surface of the inner cylinder 12 is maximum in the major axis direction of the inner peripheral surface 24a of the restricting member 24 and minimum in the minor axis direction of the inner peripheral surface 24a of the restricting member 24 when viewed from the vertical direction.

[0035] The cab mount 3 is attached to the vehicle so that the gap between the inner peripheral surface 24a of the restricting member 24 and the outer peripheral surface of the inner cylinder 12 is narrowest in the vehicle longitudinal direction. In other words, the cab mount 3 is attached to the vehicle so that the minor axis direction of the inner peripheral surface 24a of the restricting member 24 coincides with the vehicle longitudinal direction when viewed from the top-bottom direction.

[0036] As described above, according to the cab mount 3 of this embodiment, the rib 23 protruding in the vertical direction is provided at the radial inner end of the regulating member 24, so that the rigidity of the regulating member 24 against the radial impact force applied to the regulating member 24 from the inner tube 12 can be ensured.

[0037] The cab mount 3 is attached to the vehicle so that the gap between the inner surface 24a of the regulating member 24 and the outer surface of the inner tube 12 is narrowest in the fore-and-aft direction of the vehicle, thereby ensuring the amount of relative movement between the outer tube 11 (body frame F) and the inner tube 12 (cab C) in the left-right direction (vehicle width direction), which tends to be relatively large in the radial direction.

[0038] The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0039] For example, the restricting members 14, 24 may not have inner peripheral surfaces 14a, 24a that surround the outer peripheral surface of the inner cylinder 12 over the entire circumference, but may instead be configured as plates spaced apart in the circumferential direction. The inner diameter of the inner cylinder 12 or the inner diameter of the fitting cylindrical portion 15a may be changed upward or downward so that the fixing bolt B moves the inner cylinder 12 at the required timing.

[0040] In addition, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, and the above-described embodiments and variations may be combined as appropriate, as long as this does not deviate from the spirit of the present invention.

[0041] For example, aspects of the present invention are as follows. <1> an outer cylinder attached to the vehicle body frame; an inner cylinder inserted inside the outer cylinder and attached to the carburetor; a main body rubber connecting an inner peripheral surface of the outer cylinder and an outer peripheral surface of the inner cylinder to each other; a restricting member that is attached to the upper end opening edge of the outer cylinder, protrudes radially inward from the inner surface of the outer cylinder, and is provided with a radial gap between the restricting member and the outer surface of the inner cylinder. <2> the restricting member is provided in a non-adhered state to the main body rubber; <1> Cab mount as described in. <3> the restricting member has an inner peripheral surface that completely surrounds the outer peripheral surface of the inner cylinder, The restricting member is attached to the vehicle so that a gap between the inner peripheral surface of the restricting member and the outer peripheral surface of the inner cylinder is narrowest in the front-rear direction of the vehicle. <1> or <2> Cab mount as described in. <4> A rib protruding in the vertical direction is provided on the radially inner end of the restricting member. <1> from <3> 1. A cab mount according to any one of the preceding claims. <5> A fitting cylinder portion is fitted into the upper end portion of the inner cylinder, a fixing bolt is integrally inserted into the inner cylinder and the fitting cylinder portion, The inner diameter of the inner cylinder or the inner diameter of the fitting cylinder portion changes upward or downward. <1> from <4> 1. A cab mount according to any one of the preceding claims. [Explanation of symbols]

[0042] 1, 2, 3 Cab Mount 11 Outer cylinder 12 Inner cylinder 13 Main body rubber 14, 24 Regulatory member 14a, 24a Inner surface 21, 23 Ribs C cab Front body frame

Claims

1. an outer cylinder attached to the vehicle body frame; an inner cylinder inserted inside the outer cylinder and attached to the carburetor; a main body rubber connecting an inner peripheral surface of the outer cylinder and an outer peripheral surface of the inner cylinder to each other; a restricting member attached to an upper end opening edge of the outer cylinder, protruding radially inward from an inner peripheral surface of the outer cylinder, and provided with a radial gap between itself and an outer peripheral surface of the inner cylinder, the restricting member has an inner peripheral surface that completely surrounds the outer peripheral surface of the inner cylinder, The cab mount is attached to the vehicle so that the gap between the inner peripheral surface of the restricting member and the outer peripheral surface of the inner cylinder is narrowest in the fore-and-aft direction of the vehicle.

2. 2. The cab mount according to claim 1, wherein the restricting member is provided in a non-adhered state to the main rubber body.

3. The cab mount according to claim 1 or 2, wherein a rib protruding in the vertical direction is provided on a radially inner end of the restricting member.

4. A fitting cylinder portion is fitted into the upper end portion of the inner cylinder, a fixing bolt is integrally inserted into the inner cylinder and the fitting cylinder portion, 3. The carburetor mount according to claim 1, wherein an inner diameter of the inner cylinder or an inner diameter of the fitting cylinder portion changes upward or downward.

5. An outer tube attached to a vehicle body frame; an inner cylinder inserted inside the outer cylinder and attached to the carburetor; a main body rubber connecting an inner peripheral surface of the outer cylinder and an outer peripheral surface of the inner cylinder to each other; a restricting member attached to an upper end opening edge of the outer cylinder, protruding radially inward from an inner peripheral surface of the outer cylinder, and provided with a radial gap between itself and an outer peripheral surface of the inner cylinder, A cab mount, wherein a rib protruding in the vertical direction is provided on a radially inner end of the restricting member.

6. An outer tube attached to a vehicle body frame; an inner cylinder inserted inside the outer cylinder and attached to the carburetor; a main body rubber connecting an inner peripheral surface of the outer cylinder and an outer peripheral surface of the inner cylinder to each other; a restricting member attached to an upper end opening edge of the outer cylinder, protruding radially inward from an inner peripheral surface of the outer cylinder, and provided with a radial gap between itself and an outer peripheral surface of the inner cylinder, A fitting cylinder portion is fitted into the upper end portion of the inner cylinder, a fixing bolt is integrally inserted into the inner cylinder and the fitting cylinder portion, A carburetor mount in which the inner diameter of the inner cylinder or the inner diameter of the fitting cylinder portion changes upward or downward.

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