Cab suspension

Abstract

The invention provides a cab suspension with a novel structure, which can restrain the increase of the elastic constant in the axial direction and the direction perpendicular to the shaft, and can set the large elastic constant in the prizing direction. A cab suspension (10) is configured from an upper suspension (12) and a lower suspension (14) that are assembled with a first vehicle member (72) therebetween, and is attached to a second vehicle member (84) by means of attachment shafts (70, 80) inserted through the upper suspension (12) and the lower suspension (14), an insertion rubber section (34) extending between the first vehicle member (72) and the mounting shaft (70) in the radial direction is provided to the lower end of an elastic body (18) constituting the upper suspension (12), a reinforcing member (44) having a cylindrical section (46) extending in the axial direction is affixed to the lower portion of the elastic body (18) in an embedded state, and the reinforcing member (44) is disposed so as to be offset upward from the insertion rubber section (34).

Description

Technical Field

[0001] The present invention relates to a cab mount interposed between a cab (driver's console) and a chassis frame in a motor vehicle. Background Art

[0002] Conventionally, in motor vehicles such as sport utility vehicles (SUVs) and trucks, a frame structure is mostly adopted, which has a structure in which a cab is vibration-isolatedly supported on a chassis frame equipped with running wheels by a cab mount. As such a cab mount, for example, a structure as disclosed in Japanese Unexamined Patent Application Publication No. 2021-092248 (Patent Document 1) is known. That is, the cab mount includes an upper mount and a lower mount assembled with a first vehicle member (chassis frame) interposed therebetween, and is mounted on a second vehicle member (cab) by inserting and penetrating a mounting shaft through the upper mount and the lower mount. Moreover, when a load is input in the approaching direction (bounce direction) between the first vehicle member and the second vehicle member, the upper mount is compressed and deformed to elastically support the load, and also exhibits a damping effect based on internal friction or the like. In addition, when a load is input in the separating direction (rebound direction) between the first vehicle member and the second vehicle member, the lower mount is compressed and deformed to elastically support the load, and also exhibits a damping effect based on internal friction or the like.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2021-092248 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] However, in the cab mount, from the viewpoint of ensuring good ride comfort performance and the like, it is not desirable that the elastic constants in the axial direction and the direction perpendicular to the axis become too high. On the other hand, for example, in order to suppress the yaw of the cab when the motor vehicle turns, it is effective to set a large elastic constant in the prying direction in the upper mount.

[0008] However, in the conventional cab mount, if the elastic constant in the prying direction of the upper mount is increased, it is difficult to avoid an increase in the elastic constants in the axial direction and the direction perpendicular to the axis.

[0009] The problem to be solved by the present invention is to provide a cab mount with a novel structure that can suppress an increase in the elastic constants in the axial direction and the direction perpendicular to the axis and set a large elastic constant in the prying direction.

[0010] Means for Solving the Problems

[0011] Hereinafter, preferred embodiments for understanding the present invention will be described. However, each of the embodiments described below is described by way of example, and not only can they be appropriately combined and adopted, but also for the multiple components described in each embodiment, they can be recognized and adopted as independently as possible, and can also be appropriately combined with any component described in other embodiments and adopted. Thus, in the present invention, it is not limited to the embodiments described below, and various other embodiments can be realized.

[0012] The first embodiment is a cab mount, which is composed of an upper mount and a lower mount assembled with a first vehicle member interposed therebetween, and is mounted on a second vehicle member by inserting and passing through a mounting shaft of these upper and lower mounts. Among them, an insertion rubber portion extending between the first vehicle member and the radial direction of the mounting shaft is provided at the lower end of the elastomer constituting the upper mount, and a reinforcing member having a cylindrical portion extending in the axial direction is fixedly connected to the lower portion of the elastomer in a buried state, and the reinforcing member is disposed offset upward with respect to the insertion rubber portion.

[0013] According to the cab mount configured in accordance with the structure of this embodiment, by fixedly connecting the reinforcing member to the lower portion of the elastomer in the upper mount, the elastic constant in the pry direction can be set to be large. In particular, by making the reinforcing member have a cylindrical portion extending in the axial direction, when the input in the pry direction acts on the tilting direction of the cylindrical portion, the acting area of the reinforcing member on the compression or tension of the elastomer can be ensured to be large, and the elastic constant in the pry direction is set to be large.

[0014] Since the cylindrical portion of the reinforcing member extends in the axial direction, the projected area in the axial direction is small, and the influence on the elastic constant in the axial direction is small by being fixedly connected to the elastomer. In addition, the reinforcing member is disposed at a position offset upward with respect to the insertion rubber portion that has a greater influence on the elastic constant in the direction perpendicular to the axis and dominantly plays a role. Therefore, the influence on the elastic constant in the direction perpendicular to the axis is also small. By studying the shape and configuration of the reinforcing member in this way, the elastic constant in the pry direction can be increased, and the increase in the elastic constant in the axial direction and the direction perpendicular to the axis can be suppressed.

[0015] The second embodiment is based on the cab mount described in the first embodiment, and an inwardly protruding flange-shaped portion is provided at the lower end of the cylindrical portion.

[0016] According to the cab mount configured in accordance with the structure of this embodiment, during the input in the pry direction, a relative inclination between the first vehicle member and the flange-shaped portion occurs, and a compressive force is applied to the elastomer between the flange-shaped portion and the first vehicle member, thereby achieving a harder elastic characteristic. In particular, since the flange-shaped portion is provided at the lower end of the cylindrical portion close to the first vehicle member, the elastic constant in the pry direction can be effectively increased.

[0017] The third method is based on the cab mount described in the first or second method, and an outwardly protruding flange-shaped portion is provided at the upper end of the cylindrical portion.

[0018] According to the cab mount formed with the structure of this method, when input in the prying direction, a part of the elastic body is compressed between the flange-shaped portion and the first vehicle member, thereby achieving a harder elastic characteristic. The flange-shaped portion is provided to protrude outwardly. Thus, when input in the prying direction, the flange portion tilts relative to the first vehicle member, thereby functioning to suppress the axial upward retraction of the compressed elastic body. Thereby, a further increase in prying elasticity is achieved. Even if it is provided at the upper end of the cylindrical portion far from the first vehicle member, it effectively contributes to an increase in the elastic constant in the prying direction.

[0019] The fourth method is based on the cab mount described in any one of the first to third methods. The reinforcing member is fixedly connected to the annular split rubber in an embedded state, and the split rubber is installed at the lower part of the main rubber, thereby constituting the elastic body, and the reinforcing member is fixedly connected to the lower part of the elastic body in an embedded state.

[0020] According to the cab mount formed with the structure of this method, the elastic body is formed into a structure in which the split rubber is installed on the main rubber, and the reinforcing member is fixedly connected to the split rubber. Therefore, for example, the degree of freedom in selecting the material of the elastic body (main rubber) can be increased without considering the fixability of the reinforcing member, etc. In addition, the positioning structure of the reinforcing member with respect to the forming die of the elastic body (main rubber) can be made easier, or it is also easy to design changes in the shape of the reinforcing member, etc. without changing the elastic body (main rubber).

[0021] The fifth method is based on the cab mount described in any one of the first to fourth methods. An assembly recess that opens upward is provided in the inner peripheral portion of the first vehicle member, and the lower part of the elastic body is inserted into the assembly recess, and the reinforcing member fixedly connected to the lower part of the elastic body enters the assembly recess.

[0022] According to the cab mount formed with the structure of this method, by disposing the reinforcing member to enter the assembly recess, the distance between the reinforcing member and the first vehicle member can be made closer, and it is possible to advantageously achieve an increase in the elastic constant in the prying direction brought about by the provision of the reinforcing member.

[0023] The sixth method is based on the cab mount described in the fifth method. The inner diameter dimension of the reinforcing member is larger than the inner diameter dimension of the first vehicle member, and the outer diameter dimension of the reinforcing member is smaller than the inner dimension of the assembly recess.

[0024] According to the cab mount formed in accordance with the structure of this embodiment, the entire reinforcing member overlaps with the mounting recess of the first vehicle member without protruding in the axial projection. Therefore, through the compression deformation or tensile deformation of the elastomer between the entire reinforcing member and the first vehicle member, high elasticity in the prying direction is effectively achieved. In addition, the influence of the reinforcing member on the elastic constant in the axial direction becomes smaller, suppressing an increase in the elastic constant in the axial direction.

[0025] In the seventh embodiment, based on the cab mount according to any one of the first to sixth embodiments, a necked concave portion that opens on the outer peripheral surface is formed on the upper portion of the elastomer, and the reinforcing member overlaps with the concave portion in the axial projection.

[0026] According to the cab mount formed in accordance with the structure of this embodiment, the elastic constant of the elastomer in the axial direction is reduced by the concave portion formed on the upper portion of the elastomer. In addition, by overlapping the reinforcing member with the concave portion in the axial projection, the influence of the reinforcing member on the elastic constant in the axial direction becomes smaller.

[0027] In the eighth embodiment, based on the cab mount according to any one of the first to seventh embodiments, the inner diameter dimension of the inserted rubber portion varies in the circumferential direction and has a petal shape when observed in the axial direction.

[0028] According to the cab mount formed in accordance with the structure of this embodiment, the portions in contact with the mounting shaft inserted through the inserted rubber portion and the portions separated from the mounting shaft are alternately arranged in the circumferential direction. Compared with the case of contacting the entire circumference, tuning of the elastic characteristics becomes easier. In particular, since the inserted rubber portion greatly affects the elastic characteristics in the direction perpendicular to the axis, it is easy to obtain soft elastic characteristics in the direction perpendicular to the axis.

[0029] Advantages of the Invention

[0030] According to the present invention, in the cab mount, an increase in the elastic constant in the axial direction and the direction perpendicular to the axis can be suppressed, and a large elastic constant can be set in the prying direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a longitudinal sectional view showing the cab mount as the first embodiment of the present invention in a vehicle-mounted state, which corresponds to Figure 3 the cross-sectional view taken along line I-I.

[0032] Figure 2 is Figure 1 a longitudinal sectional view of the upper mount unit constituting the cab mount shown in Figure 3 the cross-sectional view taken along line II-II.

[0033] Figure 3 is Figure 2 the bottom view of the upper suspension member shown in the figure.

[0034] Figure 4 is the component that Figure 1 the longitudinal sectional view of the lower suspension member unit of the cab suspension member shown in the figure.

[0035] Figure 5 is the longitudinal sectional view showing the cab suspension member as the second embodiment of the present invention in the vehicle assembly state.

[0036] Figure 6 is the component that Figure 5 the longitudinal sectional view of the upper suspension member unit of the cab suspension member shown in the figure. Detailed Embodiment

[0037] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0038] In Figure 1 is shown a cab suspension member 10 for a motor vehicle as the first embodiment of the present invention. The cab suspension member 10 is composed of an upper suspension member 12 and a lower suspension member 14. In the following description, in principle, the up-and-down direction refers to the axial direction of the cab suspension member 10, that is, Figure 1 the up-and-down direction in

[0039] As shown in Figure 2 , Figure 3 the upper suspension member 12 is integrally formed in a cylindrical shape and has a structure in which a first elastic body 18 as an elastic body is fixedly connected to an upper plate 16. The upper plate 16 is a member in a substantially circular ring plate shape formed of metal or the like, and is formed with a first bolt insertion through hole 24 that penetrates the central portion in the thickness direction.

[0040] The first elastic body 18 is composed of a main body rubber 20 and a split rubber 22. The main body rubber 20 is formed of rubber and a resin elastic body. The main body rubber 20 is formed in a substantially cylindrical shape having a first inner hole 26 that penetrates in the up-and-down direction. At the upper part of the main body rubber 20, a first notch 28 as a notch portion that opens on the outer peripheral surface is continuously formed over the entire circumference. The first notch 28 in the present embodiment is formed in a widened shape in which the width dimension in the axial direction becomes larger toward the outer periphery, and is formed in a substantially constant cross-sectional shape over the entire circumference. The depth dimension of the first notch 28 is preferably 1 / 3 times or more of the radial thickness dimension of the upper part of the main body rubber 20, and is approximately half in the present embodiment.

[0041] On the inner circumferential surface of the main rubber 20, a first intermediate lip 30 protruding toward the inner circumference is provided. The first intermediate lip 30 is formed in a tapered cross-sectional shape that narrows in the axial direction toward the protruding front end and is continuously formed over the entire circumference. The vertex in the longitudinal cross-section of the first intermediate lip 30 is axially located between the first recessed portion 28 and the mounting recessed portion 32 described later, and both the first recessed portion 28 and the mounting recessed portion 32 are located at axially offset positions.

[0042] An insertion rubber portion 34 is provided at the lower end of the main rubber 20. The insertion rubber portion 34 is formed in a substantially cylindrical shape with a thin wall and a small diameter and protrudes downward from the inner circumferential end of the main rubber 20. The outer circumferential surface of the insertion rubber portion 34 is formed as a substantially cylindrical surface, and the inner circumferential surface is formed in a wavy shape with a diameter dimension that varies in the circumferential direction, and is formed in a petal shape in the axial view (bottom view) shown in Figure 3 . More specifically, on the inner circumferential end of the insertion rubber portion 34, a plurality of support protrusions 36 protruding toward the inner circumference and concave portions 38 recessed on the outer circumference are alternately provided in the circumferential direction, and the inner diameter dimension of the formed portion of the support protrusions 36 is smaller than the inner diameter dimension of the formed portion of the concave portions 38. The inner circumferential surfaces of the support protrusions 36 and the concave portions 38 are formed by curved surfaces that are smoothly continuous in the circumferential direction.

[0043] A mounting recessed portion 32 is continuously provided over the entire circumference at the lower part of the main rubber 20. The mounting recessed portion 32 is formed in a notch shape that opens on the outer circumferential surface and the lower surface of the main rubber 20. In the mounting recessed portion 32, a plurality of outer circumferential locking portions 40 protruding downward from the outer circumferential end and inner circumferential locking portions 42 protruding toward the outer circumference at the lower end of the inner circumferential end are locally provided at a plurality of positions in the circumferential direction. As Figure 3 shown, in the present embodiment, two outer circumferential locking portions 40 for positioning the split rubber 22 in the circumferential direction are formed on both radial sides, and eight inner circumferential locking portions 42 for preventing the split rubber 22 from falling off downward are formed at substantially equal intervals in the circumferential direction. The outer circumferential portion of the main rubber 20 is locally formed with a large diameter at the formed portion of the outer circumferential locking portion 40 in the circumferential direction.

[0044] The split rubber 22 is formed independently of the main rubber 20 and is formed in a ring shape extending with a substantially rounded rectangular cross-section. At the outer circumferential corner portion of the upper end of the split rubber 22, a plurality of outer circumferential notch portions 52 corresponding to the outer circumferential locking portions 40 of the main rubber 20 are locally formed in the circumferential direction. At the inner circumferential corner portion of the lower end of the split rubber 22, an inner circumferential notch portion 54 corresponding to the inner circumferential locking portions 42 of the main rubber 20 is continuously formed over the entire circumference. In the present embodiment, the outer circumferential notch portions 52 are provided at two positions in the circumferential direction.

[0045] The reinforcing member 44 is fixed to the split rubber 22 in an embedded state. The reinforcing member 44 is formed of metal, synthetic resin, etc., and its rigidity is higher than that of the main rubber 20. The reinforcing member 44 includes a cylindrical portion 46 in a substantially cylindrical shape. The reinforcing member 44 is continuously provided with an inner flange-shaped portion 48 protruding from the lower end of the cylindrical portion 46 toward the inner periphery and an outer flange-shaped portion 50 protruding from the upper end of the cylindrical portion 46 toward the outer periphery, respectively, throughout the entire circumference. The reinforcing member 44 of the present embodiment is a stamped metal part in which the cylindrical portion 46, the inner flange-shaped portion 48, and the outer flange-shaped portion 50 are integrally formed. In the reinforcing member 44, it is preferred that the axial length dimension L is larger than any one of the protruding dimension A of the inner flange-shaped portion 48 toward the inner periphery and the protruding dimension B of the outer flange-shaped portion 50 toward the outer periphery.

[0046] In the present embodiment, the split rubber 22 is formed as an integral vulcanized molded part having a reinforcing member 44, and the reinforcing member 44 is a member independent of the integral vulcanized molded part of the main body rubber 20. Therefore, it is not necessary to arrange the reinforcing member 44 when molding the main body rubber 20, and it is possible to facilitate the molding process of the main body rubber 20. It should be noted that the inner peripheral end of the inner flange-shaped portion 48 of the reinforcing member 44 is exposed to the outside through the inner peripheral notch portion 54, but is embedded in the split rubber 22 as a whole.

[0047] The split rubber 22 to which the reinforcing member 44 is fixed in an embedded state is mounted on the main rubber 20. The split rubber 22 passes over the inner peripheral locking portion 42 and is inserted into the mounting recess 32 of the main rubber 20 from below. The split rubber 22 is prevented from falling downward from the mounting recess 32 by being locked with the inner peripheral locking portion 42 in the axial direction. In addition, the split rubber 22 is positioned relative to the main rubber 20 in the circumferential direction by inserting the outer peripheral locking portion 40 provided at the opening end of the mounting recess 32 into the outer peripheral notch 52 of the split rubber 22. In this way, the upper suspension 12 of the present embodiment forms the first elastic body 18 by mounting the split rubber 22 on the main rubber 20, and the reinforcing member 44 is fixed in an embedded state to the lower part of the first elastic body 18.

[0048] The reinforcing member 44 fixed to the lower portion of the first elastic body 18 overlaps with the first recessed portion 28 in the axial projection. Figure 2 In the single-piece state of the upper suspension 12 shown before being installed on the vehicle, the reinforcing member 44 is located as a whole at a position closer to the outer peripheral side than the inner peripheral end (deepest part) of the first recessed portion 28, and overlaps with the first recessed portion 28 in the axial projection. It should be noted that the structure in which the first recessed portion 28 overlaps with the reinforcing member 44 in the axial projection is the single-piece state of the upper suspension 12 before being assembled to the vehicle, and in the assembled state assembled to the vehicle, it may also be overlapped due to the weight of the vehicle body. Figure 1 In this way, the bottom of the first recessed portion 28 is offset toward the outer peripheral side relative to the reinforcing member 44 .

[0049] The reinforcing member 44 is disposed at a position offset upward from the insertion rubber portion 34 provided at the lower end of the first elastic body 18. Therefore, in the projection in the direction perpendicular to the axis, the insertion rubber portion 34 and the reinforcing member 44 are separated from each other without overlapping. In addition, the reinforcing member 44 is separated from the insertion rubber portion 34 toward the outer periphery and does not overlap the insertion rubber portion 34 in the axial projection.

[0050] As Figure 4 shown, the entire lower suspension member 14 is formed in a cylindrical shape and has a structure in which the second elastic body 58 is fixed to the lower plate 56. The lower plate 56 is a member in a substantially circular ring plate shape formed of metal or the like, and is formed with a second bolt insertion through hole 60 penetrating the central portion in the thickness direction.

[0051] The second elastic body 58 is formed of rubber or a resin elastic body in the same manner as the first elastic body 18. The second elastic body 58 is formed in a substantially cylindrical shape having a second inner hole 62 penetrating in the vertical direction. At the lower portion of the second elastic body 58, a second recessed portion 64 opening on the outer peripheral surface is continuously formed over the entire circumference. The second recessed portion 64 is formed in an expanded shape in which the width dimension in the axial direction increases toward the outer periphery. The depth dimension of the second recessed portion 64 is preferably more than half of the diameter dimension of the upper portion of the second elastic body 58, and is approximately 2 / 3 times in the present embodiment.

[0052] The upper end portion of the second inner hole 62 of the second elastic body 58 is formed as a large-diameter enlarged diameter portion 66. Thus, the second elastic body 58 is formed to be thin-walled in the radial direction at the upper end portion where the enlarged diameter portion 66 is formed.

[0053] A second intermediate lip 68 protruding toward the inner periphery is provided on the inner peripheral surface of the second elastic body 58. The second intermediate lip 68 is formed in a front-end tapered cross-sectional shape in which the width in the axial direction becomes narrower toward the protruding front end, and is continuously formed over the entire circumference.

[0054] As Figure 1 shown, the upper suspension member 12 and the lower suspension member 14 are vertically overlapped in the axial direction, and the connecting member 70 is inserted through the first inner hole 26 of the first elastic body 18 of the upper suspension member 12 and the second inner hole 62 of the second elastic body 58 of the lower suspension member 14. The connecting member 70 is a highly rigid member formed of metal or the like, and is formed in a substantially cylindrical shape with a small diameter capable of being inserted through the first inner hole 26 of the first elastic body 18 and the second inner hole 62 of the second elastic body 58. The axial end faces of the connecting member 70 abut against the upper plate 16 and the lower plate 56, and the first bolt insertion through hole 24 and the second bolt insertion through hole 60 communicate with the inner hole of the connecting member 70.

[0055] The first intermediate lip 30 protruding from the inner peripheral surface of the first inner hole 26, the second intermediate lip 68 protruding from the inner peripheral surface of the second inner hole 62, and the plurality of support protrusions 36 protruding from the inner peripheral surface of the inserted rubber portion 34 are respectively pressed against the outer peripheral surface of the connection member 70. Thus, the connection member 70 is elastically supported by the first elastic body 18 and the second elastic body 58. It should be noted that the inner peripheral surfaces of the first inner hole 26 and the second inner hole 62 are separated from the outer peripheral surface of the connection member 70 at portions deviating from the first intermediate lip 30 and the second intermediate lip 68.

[0056] The chassis frame 72 as the first vehicle member is sandwiched between the upper suspension member 12 and the lower suspension member 14 which overlap vertically. The chassis frame 72 is a plate-shaped metal material and has an insertion through hole 74 penetrating in the vertical direction. The opening peripheral portion of the insertion through hole 74 in the chassis frame 72 is formed into a cylindrical insertion tube portion 76 protruding downward. An assembly recess 78 opening upward is formed in the inner peripheral portion of the chassis frame 72. The assembly recess 78 is formed into a shallow-bottomed disk shape integrally having a bottom wall 80 and a peripheral wall 82, and an insertion through hole 74 is formed through the center portion of the bottom wall 80, and the insertion tube portion 76 protrudes downward from the inner peripheral end portion of the bottom wall 80.

[0057] The lower portion of the first elastic body 18 including the split rubber 22 of the upper suspension member 12 is inserted into the assembly recess 78 of the chassis frame 72. At least a part of the reinforcing member 44 fixed to the lower portion of the first elastic body 18 enters the assembly recess 78. Preferably, the lower end position C of the outer flange-shaped portion 50 of the reinforcing member 44 is located below the upper end position D of the assembly recess 78. In the present embodiment, the entire reinforcing member 44 is located below the upper end of the assembly recess 78 and is disposed in the assembly recess 78 in a housed state.

[0058] The reinforcing member 44 is located at a position outer to the insertion through hole 74 and overlaps the bottom wall 80 of the assembly recess 78 in the axial projection. Therefore, the inner diameter dimension of the inner flange-shaped portion 48 of the reinforcing member 44 is larger than the inner diameter dimension of the chassis frame 72 (the diameter of the insertion through hole 74), and the outer diameter dimension of the outer flange-shaped portion 50 of the reinforcing member 44 is smaller than the inner dimension in the direction perpendicular to the axis of the assembly recess 78.

[0059] The distance in the direction perpendicular to the axis between the outer flange-shaped portion 50 of the reinforcing member 44 and the peripheral wall 82 of the assembly recess 78 is shorter than the distance in the direction perpendicular to the axis between the inner flange-shaped portion 48 and the connection member 70 described later. The distance from the lower end of the reinforcing member 44 to the upper surface of the bottom wall 80 of the assembly recess 78 is shorter than the distance in the direction perpendicular to the axis between the outer flange-shaped portion 50 and the peripheral wall 82 of the assembly recess 78, and the inner flange-shaped portion 48 is disposed opposite to and close to the chassis frame 72 in the axial direction.

[0060] The insertion rubber part 34 of the upper mount 12 is inserted into the insertion through-hole 74 of the chassis frame 72 and extends axially between the radial directions of the connection member 70 and the insertion cylinder part 76 of the chassis frame 72.

[0061] The insertion cylinder part 76 of the chassis frame 72 is embedded in the enlarged-diameter part 66 of the second inner hole 62 in the lower mount 14. The lower end surface of the insertion cylinder part 76 abuts against the bottom surface of the enlarged-diameter part 66 axially.

[0062] The lower end surface of the insertion rubber part 34 disposed on the inner periphery of the insertion cylinder part 76 abuts against the bottom surface of the enlarged-diameter part 66 axially and is compressed axially. The insertion rubber part 34 is compressed axially, so that it tends to expand in the direction perpendicular to the axis according to Poisson's ratio. Therefore, it is respectively pressed against the outer peripheral surface of the connection member 70 and the inner peripheral surface of the insertion cylinder part 76 and is compressed radially between the connection member 70 and the insertion cylinder part 76.

[0063] The inner peripheral surface of the insertion rubber part 34 is formed into a petal shape in which the concavities and convexities are alternately continuous in the circumferential direction. The support protrusions 36 as the convex parts are pressed against the outer peripheral surface of the connection member 70, and the concave parts 38 as the concave parts are separated from the connection member 70 toward the outer periphery. Thereby, the elastic constant of the insertion rubber part 34 can be adjusted, and the elastic characteristics of the upper mount 12 in the direction perpendicular to the axis, which are greatly affected by the elastic constant of the insertion rubber part 34, can be adjusted.

[0064] At a position on the outer peripheral side of the enlarged-diameter part 66, the upper end surface of the second elastic body 58 of the lower mount 14 is pressed against the lower surface of the bottom wall 80 of the fitting recess 78 of the chassis frame 72, and the second elastic body 58 is compressed axially between the lower plate 56 and the chassis frame 72.

[0065] The upper plate 16 and the lower plate 56 are positioned axially with respect to each other by the mounting bolts 84. The mounting bolts 84 are inserted through the first bolt insertion through-hole 24 of the upper plate 16, the inner hole of the connection member 70, and the second bolt insertion through-hole 60 of the lower plate 56. Then, by tightening the nuts 86 on the mounting bolts 84, the distance between the opposed surfaces in the axial direction of the upper plate 16 and the lower plate 56 is set to the length of the connection member 70. Thereby, the first elastic body 18 is compressed axially between the upper plate 16 and the chassis frame 72, and the second elastic body 58 is compressed axially between the lower plate 56 and the chassis frame 72. By compressing the first elastic body 18 and the second elastic body 58 axially, the areas of the longitudinal cross-sections of the first notch 28 and the second notch 64 become smaller.

[0066] In addition, due to the deformation caused by the axial compression of the first elastic body 18, the split rubber 22 is pressed against the inner surface of the mounting recess 32 of the main rubber 20, and the gap between the main rubber 20 and the split rubber 22 disappears, and the main rubber 20 and the split rubber 22 become continuous as one body.

[0067] In addition, a part of the cab 88, which is a second vehicle component, overlaps the upper surface of the upper plate 16, and the cab 88 is fastened to the upper plate 16 by mounting bolts 84. Thus, the upper mount 12 of the cab mount 10 is sandwiched between the chassis frame 72 and the cab 88, and the chassis frame 72 and the cab 88 are vibration-isolatingly connected by the cab mount 10. In the present embodiment, the mounting shaft inserted through the upper mount 12 and the lower mount 14 is constituted by the connecting member 70 and the mounting bolts 84 inserted through the connecting member 70, and the cab mount 10 is mounted on the cab 88 through the mounting shaft.

[0068] Moreover, in the vehicle-mounted state of the cab mount 10, when axial vibration is input between the chassis frame 72 and the cab 88, either the first elastic body 18 of the upper mount 12 or the second elastic body 58 of the lower mount 14 is compressed axially, thereby exerting a vibration-isolating effect based on internal friction or the like. In addition, for the vibration input in the direction perpendicular to the axis, the vibration-isolating effect brought about by the deformation of the first elastic body 18 and the second elastic body 58 can also be exerted.

[0069] For the purpose of good ride comfort and the like, the elastic constant in the vertical direction of the cab mount 10 is preferably set small while ensuring the required support elastic rigidity in the vertical direction. Similarly, considering ride comfort performance and the like, the elastic constant in the left-right direction of the cab mount 10 is also preferably small. On the other hand, for the purpose of suppressing the vibration of the cab 88 when the motor vehicle turns, it is desirable to set the elastic constant in the prying direction of the cab mount 10 large.

[0070] Therefore, in the cab mount 10 of the present embodiment, a reinforcing member 44 is fixedly connected in a buried state at the lower part of the first elastic body 18 in the upper mount 12, and the reinforcing member 44 is formed in a shape having a cylindrical portion 46 extending in the axial direction. Thus, when input in the prying direction, the cylindrical portion 46 of the reinforcing member 44 is displaced in the inclined direction, so that the acting area of the compressive force or tensile force applied by the cylindrical portion 46 to the first elastic body 18 becomes large, and the elastic constant with respect to the input in the prying direction becomes large.

[0071] The axial projected area of the cylindrical portion 46 of the reinforcing member 44 is small, so it is not likely to affect the elastic constant during axial input, and a soft elastic characteristic in the axial direction is achieved.

[0072] The reinforcing member 44 is disposed at a position deviated upward in the axial direction from the insertion rubber portion 34 that has a relatively large influence on the elastic constant in a direction perpendicular to the axis with respect to the upper mount 12. Thereby, in the upper mount 12, the influence of the reinforcing member 44 on the elastic constant in the direction perpendicular to the axis is suppressed, and a soft elastic characteristic is also achieved in the direction perpendicular to the axis.

[0073] The reinforcing member 44 of the present embodiment has an inwardly protruding inner flange-like portion 48 at the lower end. Thereby, when the cylindrical portion 46 of the reinforcing member 44 is about to tilt, the thin-walled rubber between the inner flange-like portion 48 and the chassis frame 72 (the bottom wall 80 of the fitting recess 78) is compressed. As a result, the elastic constant with respect to the input in the prying direction becomes larger, preventing vibrations of the cab 88 during turning caused by a hard elastic characteristic.

[0074] In addition, the reinforcing member 44 has an outwardly protruding outer flange-like portion 50 at the upper end. Thereby, when the cylindrical portion 46 of the reinforcing member 44 is about to tilt, the rubber between the outer flange-like portion 50 and the chassis frame 72 is also compressed, achieving an increase in the elastic constant with respect to the input in the prying direction.

[0075] It should be noted that the reinforcing member may have an inwardly protruding inner flange-like portion provided at the upper end of the cylindrical portion and an outwardly protruding outer flange-like portion provided at the lower end of the cylindrical portion. However, considering the accommodation of the reinforcing member 44 in the fitting recess 78, the tuning of the elastic characteristics, etc., it is preferable that, like the reinforcing member 44 of the present embodiment, the reinforcing member 44 has an inwardly protruding inner flange-like portion 48 provided at the lower end of the cylindrical portion 46 and an outwardly protruding outer flange-like portion 50 provided at the upper end of the cylindrical portion 46.

[0076] The axial length dimension L of the reinforcing member 44 of the present embodiment is larger than either the protruding dimension A of the inner flange-like portion 48 protruding inwardly and the protruding dimension B of the outer flange-like portion 50 protruding outwardly. Thereby, an increase in the rubber compression area in the axial direction caused by the inner flange-like portion 48 and the outer flange-like portion 50 can be suppressed, preventing the compressive elastic characteristic in the axial direction from becoming too hard, and the increase in the prying elasticity caused by the inclination of the reinforcing member 44 (cylindrical portion 46) can be more effectively achieved.

[0077] The lower portion of the upper mount 12 is inserted into a fitting recess 78 provided in the chassis frame 72, whereby the lower portion of the upper mount 12 is positioned and held relative to the chassis frame 72 by a simple fitting structure.

[0078] In addition, by inserting the reinforcing member 44 disposed at the lower portion of the upper mount 12 into the fitting recess 78, a relatively hard elastic characteristic with respect to the prying input can be effectively obtained by the compression or tension of the thin-walled rubber sandwiched between the reinforcing member 44 and the fitting recess 78.

[0079] In the present embodiment, the lower end position C of the outward flange portion 50 in the reinforcing member 44 is located below the upper end position D of the fitting recess 78. Therefore, the outward flange portion 50 approaches the peripheral wall 82 of the fitting recess 78 and overlaps in a radially opposed state. Thus, when input is applied in the prying direction, since the outward flange portion 50 is relatively inclined with respect to the chassis frame 72 and the first elastic body 18 that is compressed is difficult to retreat upward in the axial direction, the prying elasticity can be increased more efficiently.

[0080] Particularly in the present embodiment, the entire reinforcing member 44 is located within the fitting recess 78 and does not project outward in the axial direction. Therefore, the free length of the first elastic body 18 in the axial direction is not likely to be shortened due to the reinforcing member 44, and it is possible to maintain soft elastic characteristics in the axial direction and the direction perpendicular to the axis. In addition, the reinforcing member 44 does not project inward or outward with respect to the bottom wall 80 of the fitting recess 78. The inner diameter dimension of the inward flange portion 48 is larger than the diameter of the insertion through-hole 74, and the outer diameter dimension of the outward flange portion 50 is smaller than the inner dimension of the peripheral wall 82 of the fitting recess 78. Thus, when input is applied in the prying direction, a large elastic constant caused by compression or stretching of the rubber that forms a thin wall between the reinforcing member 44 and the fitting recess 78 can be obtained.

[0081] In Figure 5 FIG. shows a cab mount 90 as a second embodiment of the present invention. The cab mount 90 is configured to include an upper mount 92 and a lower mount 14. In the present embodiment, for components and parts that are substantially the same as those in the first embodiment, the same reference numerals may be used in the drawings and the description may be omitted.

[0082] Also as Figure 6 shown, the upper mount 92 is formed in a structure in which an upper plate 16 and a reinforcing member 44 are fixed to a first elastic body 94 that is an elastic body. The first elastic body 94 is formed in a shape in which the main body rubber 20 and the split rubber 22 of the first embodiment are integrated. The mounting recess 32 as in the first embodiment is not provided in the first elastic body 94, and the reinforcing member 44 is directly fixed to the lower portion of the first elastic body 94 and arranged in a buried state. The first elastic body 94 of the present embodiment is formed as an integrally vulcanized molded article including the upper plate 16 and the reinforcing member 44.

[0083] According to the cab mount 10 of the present embodiment, since the entire upper mount 92 is formed as an integrally vulcanized molded article of the first elastic body 94, compared with the first embodiment in which it is necessary to separately form a vulcanized molded article of the main body rubber 20 having the upper plate 16 and a vulcanized molded article of the split rubber 22 having the reinforcing member 44, the forming process of the elastic body can be reduced.

[0084] As described above, the embodiments of the present invention have been described in detail, but the present invention is not limited to this specific description. For example, the reinforcing member 44 only needs to have the cylindrical portion 46, and either the inner flange-shaped portion 48 or the outer flange-shaped portion 50 may be provided only on one side, or neither may be provided. In addition, the cylindrical portion 46 of the reinforcing member 44 may be, for example, a tapered cylindrical shape that expands or contracts upward, a bent tapered cylindrical shape with a varying inclination angle in the axial direction, or the like.

[0085] In the vehicle assembly state of the cab mount 10, the reinforcing member 44 does not need to be entirely received in the assembly recess 78 of the chassis frame 72, and only a part thereof may enter. In addition, the reinforcing member 44 may not enter the assembly recess 78, or may not overlap in the projection in the direction perpendicular to the axis with respect to the chassis frame 72. It should be noted that in the chassis frame 72, the assembly recess 78 is not essential.

[0086] The shape of the first elastic body 18 of the upper mount 12 is not limited by the specific description of the above embodiment and can be appropriately changed. Specifically, for example, the shape, size, etc. of the first notch 28 and the mounting recess 32 can be appropriately changed according to the required elastic characteristics and the like. Similarly, the shape of the second elastic body 58 of the lower mount 14 is not limited by the specific description of the above embodiment.

[0087] In order to advantageously tune the elastic characteristics, the inner peripheral surface of the insertion rubber portion 34 is preferably formed in a petal shape as in the above embodiment, but for example, it can also be formed in a substantially cylindrical shape with a constant inner diameter. In addition, when petals-shaped concavities and convexities are provided on the inner peripheral surface of the insertion rubber portion 34, the number of the concavities and convexities is not particularly limited, and the shape and the radial height (depth) of the concavities and convexities can also be appropriately set.

[0088] Description of Reference Numerals

[0089] 10: Cab mount (first embodiment);

[0090] 12: Upper mount;

[0091] 14: Lower mount;

[0092] 16: Upper plate;

[0093] 18: First elastic body (elastic body);

[0094] 20: Main rubber;

[0095] 22: Split rubber;

[0096] 24: First bolt insertion through-hole;

[0097] 26: First inner hole;

[0098] 28: First recessed portion;

[0099] 30: First intermediate lip;

[0100] 32: Mounting recess;

[0101] 34: Insertion rubber portion;

[0102] 36: Support protrusion;

[0103] 38: Concave portion;

[0104] 40: Outer peripheral locking portion;

[0105] 42: Inner peripheral locking portion;

[0106] 44: Reinforcing member;

[0107] 46: Cylindrical portion;

[0108] 48: Inner flange-like portion;

[0109] 50: Outer flange-like portion;

[0110] 52: Outer peripheral notch;

[0111] 54: Inner peripheral notch;

[0112] 56: Lower plate;

[0113] 58: Second elastic body;

[0114] 60: Second bolt insertion through-hole;

[0115] 62: Second inner hole;

[0116] 64: Second recessed portion;

[0117] 66: Diameter-expanded portion;

[0118] 68: Second intermediate lip;

[0119] 70: Connecting member (mounting shaft)

[0120] 72: Chassis frame (first vehicle member);

[0121] 74: Insertion through-hole;

[0122] 76: Insertion cylinder portion;

[0123] 78: Assembly recess;

[0124] 80: Bottom wall;

[0125] 82: Peripheral wall;

[0126] 84: Mounting bolt (mounting shaft)

[0127] 86: Nut;

[0128] 88: Cab (second vehicle component)

[0129] 90: Cab mount (second embodiment)

[0130] 92: Upper mount

[0131] 94: First elastomer (elastomer).

Claims

1. A cab mounting member is composed of an upper mounting member and a lower mounting member assembled with a first vehicle member interposed therebetween, and is mounted on a second vehicle member by inserting a mounting shaft penetrating through the upper and lower mounting members. Among them, an insertion rubber portion extending between the first vehicle member and the radial direction of the mounting shaft is provided at the lower end of the elastomer constituting the upper mounting member. A reinforcing member having a cylindrical portion extending in the axial direction is fixedly connected to the lower portion of the elastomer in a buried state, and the reinforcing member is disposed offset upward with respect to the insertion rubber portion.

2. The cab mounting member according to claim 1, wherein, An inner flange-shaped portion protruding toward the inner circumference is provided at the lower end of the cylindrical portion.

3. The cab mounting member according to claim 1 or 2, wherein, An outer flange-shaped portion protruding toward the outer circumference is provided at the upper end of the cylindrical portion.

4. The cab mounting member according to claim 1 or 2, wherein, The reinforcing member is fixedly connected to an annular split rubber in a buried state, and the split rubber is mounted on the lower portion of the main rubber, thereby constituting the elastomer, and the reinforcing member is fixedly connected to the lower portion of the elastomer in a buried state.

5. The cab mounting member according to claim 1 or 2, wherein a fitting recess opening upward is provided in the inner peripheral portion of the first vehicle member. The lower portion of the elastomer is inserted into the fitting recess, and the reinforcing member fixedly connected to the lower portion of the elastomer enters the fitting recess.

6. The cab mounting member according to claim 5, wherein, The inner diameter dimension of the reinforcing member is larger than the inner diameter dimension of the first vehicle member, and the outer diameter dimension of the reinforcing member is smaller than the inner dimension of the fitting recess.

7. The cab mounting member according to claim 1 or 2, wherein a necked concave portion opening on the outer peripheral surface is formed in the upper portion of the elastomer. The reinforcing member overlaps with the concave portion in the axial projection.

8. The cab mounting member according to claim 1 or 2, wherein The inner diameter dimension of the insertion rubber portion varies in the circumferential direction and has a petal shape when observed in the axial direction.

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